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St Nicholas 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for St Nicholas

Hertfordshire, United Kingdom

Long range weather outlook for St Nicholas includes 14 day forecast summary:

The forecast for St Nicholas in the coming two weeks is predicting the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 19°C expected on the afternoon of Wednesday 8th. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Monday 29th at 6°C. The next 14 days will have some days seeing a little precipitation and some days with rain. The current forecast indicates Sunday 5th will have the most precipitation with an accumulation of around 17.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 29
Apr
12:00

SSW
SSW

19 / 23 mph 57 / 52°F 59% 1014 mb
Low level cloud: 41%
Mid level cloud: 5%
High level cloud: 20%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

17 / 22 mph 58 / 53°F 62% 1014 mb
Low level cloud: 17%
Mid level cloud: 5%
High level cloud: 13%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

14 / 20 mph 54 / 49°F 72% 1014 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

11 / 19 mph 48 / 44°F 83% 1015 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 1%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 30
Apr
00:00

SSE
SSE

9 / 17 mph 47 / 43°F 88% 1014 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 1%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

7 / 15 mph 46 / 42°F 92% 1014 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

9 / 15 mph 47 / 42°F 93% 1013 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

15 / 18 mph 58 / 53°F 73% 1012 mb
Low level cloud: 33%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

16 / 20 mph 62 / 61°F 64% 1010 mb
Low level cloud: 60%
Mid level cloud: 32%
High level cloud: 7%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

14 / 19 mph 56 / 53°F 83% 1009 mb
Low level cloud: 14%
Mid level cloud: 60%
High level cloud: 8%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

10 / 14 mph 55 / 52°F 87% 1009 mb
Low level cloud: 14%
Mid level cloud: 72%
High level cloud: 4%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

7 / 12 mph 51 / 48°F 98% 1010 mb
Low level cloud: 60%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 01
May
00:00

SE
SE

6 / 11 mph 50 / 47°F 97% 1010 mb
Low level cloud: 27%
Mid level cloud: 28%
High level cloud: 2%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

6 / 11 mph 49 / 46°F 95% 1010 mb
Low level cloud: 22%
Mid level cloud: 30%
High level cloud: 3%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

3 / 5 mph 49 / 48°F 95% 1010 mb
Low level cloud: 40%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

3 / 3 mph 58 / 57°F 75% 1010 mb
Low level cloud: 12%
Mid level cloud: 22%
High level cloud: 93%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

6 / 7 mph 63 / 61°F 67% 1009 mb
Low level cloud: 59%
Mid level cloud: 26%
High level cloud: 33%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

9 / 13 mph 58 / 56°F 84% 1008 mb
Low level cloud: 99%
Mid level cloud: 95%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

11 / 17 mph 57 / 55°F 92% 1007 mb
Low level cloud: 86%
Mid level cloud: 31%
High level cloud: 44%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

13 / 20 mph 52 / 48°F 97% 1006 mb
Low level cloud: 86%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 02
May
00:00

N
N

15 / 23 mph 49 / 43°F 97% 1004 mb
Low level cloud: 86%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

14 / 21 mph 49 / 44°F 98% 1002 mb
Low level cloud: 95%
Mid level cloud: 85%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

N
N

12 / 17 mph 51 / 46°F 98% 1001 mb
Low level cloud: 92%
Mid level cloud: 83%
High level cloud: 31%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

10 / 14 mph 55 / 52°F 94% 1001 mb
Low level cloud: 97%
Mid level cloud: 44%
High level cloud: 72%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

7 / 10 mph 58 / 56°F 94% 1001 mb
Low level cloud: 98%
Mid level cloud: 75%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

3 / 4 mph 59 / 59°F 93% 1001 mb
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

3 / 5 mph 58 / 59°F 96% 1002 mb
Low level cloud: 98%
Mid level cloud: 64%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

5 / 7 mph 54 / 53°F 98% 1004 mb
Low level cloud: 99%
Mid level cloud: 48%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 03
May
00:00

W
W

8 / 11 mph 51 / 47°F 98% 1004 mb
Low level cloud: 100%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

10 / 14 mph 49 / 45°F 98% 1005 mb
Low level cloud: 100%
Mid level cloud: 78%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

14 / 20 mph 48 / 42°F 96% 1006 mb
Low level cloud: 100%
Mid level cloud: 91%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

17 / 26 mph 47 / 40°F 93% 1007 mb
Low level cloud: 99%
Mid level cloud: 77%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

15 / 22 mph 47 / 41°F 88% 1009 mb
Low level cloud: 86%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

14 / 18 mph 55 / 50°F 73% 1009 mb
Low level cloud: 37%
Mid level cloud: 15%
High level cloud: 6%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

8 / 11 mph 55 / 51°F 80% 1009 mb
Low level cloud: 3%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

7 / 12 mph 48 / 46°F 92% 1010 mb
Low level cloud: 31%
Mid level cloud: 4%
High level cloud: 22%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 04
May
00:00

SSW
SSW

6 / 11 mph 47 / 44°F 94% 1010 mb
Low level cloud: 8%
Mid level cloud: 20%
High level cloud: 10%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

4 / 8 mph 45 / 43°F 92% 1009 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

4 / 7 mph 48 / 45°F 87% 1009 mb
Low level cloud: 31%
Mid level cloud: 45%
High level cloud: 43%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

6 / 8 mph 55 / 52°F 80% 1008 mb
Low level cloud: 51%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

9 / 11 mph 59 / 56°F 70% 1007 mb
Low level cloud: 54%
Mid level cloud: 28%
High level cloud: 20%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

7 / 9 mph 57 / 56°F 74% 1006 mb
Low level cloud: 60%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

E
E

2 / 3 mph 55 / 56°F 85% 1006 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNW
NNW

7 / 12 mph 51 / 48°F 90% 1006 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: medium
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 05
May
00:00

NNW
NNW

8 / 13 mph 49 / 46°F 94% 1006 mb
Low level cloud: 7%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

9 / 14 mph 48 / 44°F 95% 1006 mb
Low level cloud: 26%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

8 / 13 mph 47 / 43°F 97% 1007 mb
Low level cloud: 91%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

WNW
WNW

10 / 16 mph 49 / 45°F 91% 1007 mb
Low level cloud: 40%
Mid level cloud: 46%
High level cloud: 88%
Most Significant Cloud Type: low
66%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

W
W

9 / 12 mph 52 / 48°F 90% 1008 mb
Low level cloud: 88%
Mid level cloud: 67%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

W
W

8 / 11 mph 53 / 50°F 93% 1007 mb
Low level cloud: 89%
Mid level cloud: 71%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

6 / 7 mph 52 / 51°F 96% 1007 mb
Low level cloud: 96%
Mid level cloud: 65%
High level cloud: 91%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
21:00

W
W

6 / 9 mph 50 / 48°F 95% 1007 mb
Low level cloud: 94%
Mid level cloud: 75%
High level cloud: 25%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 06
May
00:00

NNE
NNE

8 / 14 mph 42 / 37°F 80% 1022 mb
Low level cloud: 55%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.0 In
06:00

NNE
NNE

13 / 28 mph 45 / 38°F 94% 1011 mb
Low level cloud: 91%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

12 / 25 mph 56 / 53°F 61% 1019 mb
Low level cloud: 74%
Mid level cloud: 6%
High level cloud: 9%
Most Significant Cloud Type: low
77%
0.0 In
18:00

NNW
NNW

8 / 17 mph 61 / 61°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 12%
Most Significant Cloud Type: medium
12%
0.0 In
Tue 07
May
00:00

NW
NW

6 / 12 mph 50 / 48°F 90% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

S
S

6 / 13 mph 50 / 47°F 82% 1018 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: medium
44%
0.0 In
12:00

SSW
SSW

9 / 18 mph 64 / 64°F 69% 1021 mb
Low level cloud: 12%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
82%
0.0 In
18:00

NNE
NNE

6 / 12 mph 58 / 57°F 81% 1019 mb
Low level cloud: 84%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.0 In
Wed 08
May
00:00

SW
SW

6 / 11 mph 56 / 55°F 94% 1025 mb
Low level cloud: 9%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: medium
85%
0.0 In
06:00

E
E

3 / 6 mph 55 / 55°F 87% 1023 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
12:00

SSW
SSW

3 / 5 mph 64 / 64°F 74% 1027 mb
Low level cloud: 0%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: medium
71%
0.0 In
18:00

ESE
ESE

7 / 15 mph 60 / 60°F 80% 1022 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: medium
54%
0.0 In
Thu 09
May
00:00

ESE
ESE

5 / 10 mph 60 / 60°F 93% 1027 mb
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 32%
Most Significant Cloud Type: medium
25%
0.0 In
06:00

NE
NE

3 / 7 mph 53 / 53°F 88% 1020 mb
Low level cloud: 30%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

E
E

11 / 21 mph 68 / 68°F 70% 1023 mb
Low level cloud: 3%
Mid level cloud: 3%
High level cloud: 34%
Most Significant Cloud Type: medium
12%
0.0 In
18:00

NNE
NNE

15 / 31 mph 49 / 44°F 89% 1019 mb
Low level cloud: 98%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Fri 10
May
00:00

ENE
ENE

5 / 10 mph 58 / 58°F 91% 1020 mb
Low level cloud: 31%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
06:00

NE
NE

11 / 23 mph 43 / 37°F 82% 1019 mb
Low level cloud: 3%
Mid level cloud: 26%
High level cloud: 3%
Most Significant Cloud Type: medium
33%
0.0 In
12:00

E
E

10 / 20 mph 70 / 70°F 74% 1018 mb
Low level cloud: 75%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
76%
0.0 In
18:00

NE
NE

11 / 22 mph 49 / 45°F 72% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 11
May
00:00

NE
NE

11 / 21 mph 51 / 47°F 94% 1019 mb
Low level cloud: 38%
Mid level cloud: 14%
High level cloud: 65%
Most Significant Cloud Type: low
51%
0.0 In
06:00

N
N

8 / 16 mph 41 / 36°F 90% 1021 mb
Low level cloud: 33%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
12:00

ENE
ENE

16 / 32 mph 64 / 64°F 70% 1020 mb
Low level cloud: 40%
Mid level cloud: 5%
High level cloud: 15%
Most Significant Cloud Type: low
43%
0.0 In
18:00

NNE
NNE

6 / 14 mph 54 / 53°F 79% 1021 mb
Low level cloud: 4%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.0 In
Sun 12
May
00:00

ENE
ENE

6 / 13 mph 50 / 47°F 74% 1021 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
06:00

ESE
ESE

3 / 6 mph 47 / 46°F 87% 1022 mb
Low level cloud: 28%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: low
48%
0.0 In
12:00

E
E

7 / 15 mph 67 / 67°F 63% 1016 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
18:00

SSE
SSE

9 / 19 mph 49 / 46°F 98% 1015 mb
Low level cloud: 98%
Mid level cloud: 96%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.1 In
Mon 13
May
00:00

E
E

6 / 13 mph 55 / 53°F 63% 1011 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 32%
Most Significant Cloud Type: medium
15%
0.0 In
06:00

N
N

12 / 25 mph 46 / 40°F 97% 1009 mb
Low level cloud: 98%
Mid level cloud: 79%
High level cloud: 22%
Most Significant Cloud Type: low
100%
0.2 In
12:00

SW
SW

7 / 14 mph 68 / 68°F 76% 1004 mb
Low level cloud: 99%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

N
N

18 / 39 mph 49 / 43°F 81% 1014 mb
Low level cloud: 20%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.3 In
Tue 14
May
00:00

W
W

12 / 24 mph 52 / 47°F 94% 1002 mb
Low level cloud: 33%
Mid level cloud: 17%
High level cloud: 20%
Most Significant Cloud Type: low
41%
0.1 In
06:00

N
N

17 / 35 mph 43 / 35°F 61% 1017 mb
Low level cloud: 96%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
12:00

WSW
WSW

19 / 39 mph 57 / 53°F 74% 1003 mb
Low level cloud: 38%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.1 In
18:00

N
N

15 / 32 mph 48 / 42°F 77% 1018 mb
Low level cloud: 8%
Mid level cloud: 44%
High level cloud: 88%
Most Significant Cloud Type: medium
70%
0.0 In

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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Local Time

The wind direction we use on this page is the direction the wind is coming from, given in a 16 point compass format.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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Speed/
Gust

Temperature from our forecast perspective are fairly well defined, they are what we would expect to measure in a standard meteorological screen (in other words, shaded and well ventilated) at 2 metres above ground level.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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Precip Amount

The total amount of cloud as a percentage is derived from looking at cloud cover throughout the atmosphere and estimating how these combine when looked at from the ground.
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Cloud Amount

Here we try to capture the feel of the weather as an image – it will never be perfect but is useful for a quick overview.
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Weather

When we measure for forecast air pressure we are normally doing this relative to a certain height and most commonly relative to Mean Sea Level.
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Pressure