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Headley 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Headley

Surrey, United Kingdom

Long range weather outlook for Headley includes 14 day forecast summary:

For Headley in the coming two weeks the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 20°C expected on the evening of Friday 21st. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Thursday 13th at 7°C. The next 14 days will have some days seeing a little precipitation and some days with rain. The indicators are that Thursday 20th will have the most precipitation with an accumulation of around 37.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 13
Jun
12:00

SSW
SSW

15 / 20 mph 56 / 52°F 80% 1013 mb
Low level cloud: 54%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

16 / 22 mph 57 / 53°F 71% 1011 mb
Low level cloud: 27%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

15 / 23 mph 53 / 48°F 91% 1008 mb
Low level cloud: 74%
Mid level cloud: 98%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

18 / 28 mph 51 / 45°F 93% 1006 mb
Low level cloud: 88%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 14
Jun
00:00

S
S

17 / 26 mph 52 / 47°F 97% 1004 mb
Low level cloud: 100%
Mid level cloud: 89%
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

SW
SW

9 / 15 mph 54 / 52°F 94% 1002 mb
Low level cloud: 83%
Mid level cloud: 13%
High level cloud: 3%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

9 / 15 mph 56 / 52°F 86% 1002 mb
Low level cloud: 65%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

12 / 19 mph 55 / 52°F 89% 1002 mb
Low level cloud: 83%
Mid level cloud: 85%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

17 / 21 mph 63 / 62°F 64% 1002 mb
Low level cloud: 58%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

19 / 23 mph 62 / 62°F 61% 1001 mb
Low level cloud: 67%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

14 / 18 mph 58 / 54°F 82% 1001 mb
Low level cloud: 17%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

8 / 13 mph 51 / 48°F 89% 1001 mb
Low level cloud: 20%
Mid level cloud: 100%
High level cloud: 3%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 15
Jun
00:00

SSW
SSW

9 / 14 mph 50 / 47°F 95% 1000 mb
Low level cloud: 32%
Mid level cloud: 97%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

7 / 12 mph 48 / 44°F 95% 1000 mb
Low level cloud: 18%
Mid level cloud: 15%
High level cloud: 4%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

11 / 16 mph 50 / 45°F 89% 1001 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 62%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

19 / 24 mph 56 / 52°F 79% 1001 mb
Low level cloud: 83%
Mid level cloud: 62%
High level cloud: 40%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

20 / 31 mph 53 / 47°F 95% 1000 mb
Low level cloud: 80%
Mid level cloud: 57%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
15:00

WSW
WSW

15 / 21 mph 62 / 61°F 63% 1000 mb
Low level cloud: 17%
Mid level cloud: 42%
High level cloud: 15%
Most Significant Cloud Type: low
33%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

WSW
WSW

15 / 21 mph 58 / 54°F 73% 1001 mb
Low level cloud: 21%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

11 / 19 mph 53 / 48°F 86% 1003 mb
Low level cloud: 11%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 16
Jun
00:00

SW
SW

14 / 23 mph 53 / 48°F 79% 1003 mb
Low level cloud: 23%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

13 / 20 mph 51 / 47°F 89% 1003 mb
Low level cloud: 48%
Mid level cloud: 20%
High level cloud: 11%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

12 / 18 mph 55 / 51°F 75% 1004 mb
Low level cloud: 92%
Mid level cloud: 16%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

16 / 19 mph 60 / 59°F 69% 1005 mb
Low level cloud: 67%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

16 / 20 mph 62 / 62°F 64% 1005 mb
Low level cloud: 62%
Mid level cloud: 69%
High level cloud: 76%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

16 / 20 mph 64 / 63°F 61% 1005 mb
Low level cloud: 72%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

13 / 17 mph 62 / 60°F 79% 1005 mb
Low level cloud: 30%
Mid level cloud: 20%
High level cloud: 80%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

7 / 12 mph 56 / 52°F 92% 1007 mb
Low level cloud: 10%
Mid level cloud: 24%
High level cloud: 97%
Most Significant Cloud Type: medium
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 17
Jun
00:00

SSW
SSW

6 / 10 mph 53 / 51°F 95% 1007 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 49%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

6 / 11 mph 52 / 50°F 97% 1008 mb
Low level cloud: 53%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

8 / 11 mph 57 / 53°F 91% 1009 mb
Low level cloud: 52%
Mid level cloud: 22%
High level cloud: 2%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

11 / 14 mph 61 / 61°F 79% 1010 mb
Low level cloud: 93%
Mid level cloud: 25%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

12 / 18 mph 65 / 64°F 76% 1010 mb
Low level cloud: 78%
Mid level cloud: 24%
High level cloud: 4%
Most Significant Cloud Type: low
86%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SW
SW

11 / 15 mph 66 / 65°F 75% 1010 mb
Low level cloud: 65%
Mid level cloud: 22%
High level cloud: 19%
Most Significant Cloud Type: low
75%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SSW
SSW

9 / 12 mph 67 / 64°F 83% 1011 mb
Low level cloud: 45%
Mid level cloud: 14%
High level cloud: 14%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

5 / 8 mph 60 / 58°F 95% 1013 mb
Low level cloud: 20%
Mid level cloud: 28%
High level cloud: 40%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 18
Jun
00:00

SW
SW

2 / 4 mph 56 / 57°F 94% 1013 mb
Low level cloud: 13%
Mid level cloud: 95%
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

WNW
WNW

2 / 4 mph 55 / 56°F 95% 1013 mb
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 70%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

4 / 6 mph 58 / 56°F 92% 1013 mb
Low level cloud: 33%
Mid level cloud: 38%
High level cloud: 11%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

6 / 8 mph 64 / 63°F 75% 1013 mb
Low level cloud: 75%
Mid level cloud: 45%
High level cloud: 12%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

6 / 7 mph 67 / 66°F 68% 1013 mb
Low level cloud: 80%
Mid level cloud: 45%
High level cloud: 18%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

8 / 10 mph 67 / 66°F 76% 1013 mb
Low level cloud: 57%
Mid level cloud: 44%
High level cloud: 69%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

7 / 11 mph 61 / 61°F 90% 1013 mb
Low level cloud: 97%
Mid level cloud: 88%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NE
NE

7 / 11 mph 57 / 56°F 93% 1014 mb
Low level cloud: 81%
Mid level cloud: 67%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 19
Jun
00:00

NE
NE

8 / 14 mph 55 / 52°F 89% 1015 mb
Low level cloud: 61%
Mid level cloud: 62%
High level cloud: 14%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

8 / 12 mph 53 / 51°F 86% 1015 mb
Low level cloud: 46%
Mid level cloud: 82%
High level cloud: 32%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

12 / 18 mph 52 / 48°F 85% 1014 mb
Low level cloud: 45%
Mid level cloud: 58%
High level cloud: 84%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

13 / 18 mph 54 / 50°F 86% 1014 mb
Low level cloud: 99%
Mid level cloud: 89%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

14 / 16 mph 57 / 53°F 96% 1013 mb
Low level cloud: 100%
Mid level cloud: 80%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
15:00

NE
NE

13 / 14 mph 58 / 55°F 97% 1012 mb
Low level cloud: 97%
Mid level cloud: 55%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NE
NE

10 / 11 mph 58 / 55°F 98% 1011 mb
Low level cloud: 93%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
21:00

NNE
NNE

11 / 15 mph 56 / 53°F 99% 1010 mb
Low level cloud: 93%
Mid level cloud: 85%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.5 In of precipitation over the past 3 hours.
0.5 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 20
Jun
00:00

SW
SW

6 / 13 mph 54 / 52°F 90% 1011 mb
Low level cloud: 1%
Mid level cloud: 14%
High level cloud: 31%
Most Significant Cloud Type: medium
18%
0.0 In
06:00

NW
NW

5 / 10 mph 57 / 56°F 84% 1023 mb
Low level cloud: 6%
Mid level cloud: 3%
High level cloud: 30%
Most Significant Cloud Type: low
10%
0.0 In
12:00

SW
SW

13 / 27 mph 62 / 62°F 82% 1015 mb
Low level cloud: 92%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
18:00

E
E

15 / 31 mph 63 / 63°F 71% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: medium
3%
0.0 In
Fri 21
Jun
00:00

ENE
ENE

13 / 26 mph 58 / 56°F 91% 1013 mb
Low level cloud: 62%
Mid level cloud: 7%
High level cloud: 36%
Most Significant Cloud Type: low
68%
0.0 In
06:00

SW
SW

5 / 11 mph 59 / 58°F 86% 1021 mb
Low level cloud: 49%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.0 In
12:00

NNW
NNW

12 / 26 mph 66 / 66°F 58% 1021 mb
Low level cloud: 7%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: low
7%
0.0 In
18:00

W
W

10 / 21 mph 61 / 61°F 74% 1022 mb
Low level cloud: 53%
Mid level cloud: 50%
High level cloud: 17%
Most Significant Cloud Type: low
72%
0.0 In
Sat 22
Jun
00:00

NNE
NNE

4 / 8 mph 65 / 65°F 91% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

W
W

8 / 17 mph 60 / 60°F 88% 1022 mb
Low level cloud: 68%
Mid level cloud: 24%
High level cloud: 2%
Most Significant Cloud Type: low
77%
0.0 In
12:00

NNE
NNE

12 / 26 mph 68 / 68°F 63% 1025 mb
Low level cloud: 78%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.0 In
18:00

W
W

13 / 27 mph 71 / 71°F 75% 1022 mb
Low level cloud: 28%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: low
31%
0.0 In
Sun 23
Jun
00:00

NE
NE

6 / 13 mph 58 / 57°F 97% 1025 mb
Low level cloud: 52%
Mid level cloud: 8%
High level cloud: 30%
Most Significant Cloud Type: low
58%
0.0 In
06:00

W
W

7 / 14 mph 63 / 63°F 91% 1023 mb
Low level cloud: 56%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
57%
0.0 In
12:00

ENE
ENE

11 / 23 mph 70 / 70°F 66% 1022 mb
Low level cloud: 63%
Mid level cloud: 15%
High level cloud: 15%
Most Significant Cloud Type: low
70%
0.0 In
18:00

W
W

9 / 19 mph 79 / 83°F 69% 1022 mb
Low level cloud: 20%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: low
22%
0.0 In
Mon 24
Jun
00:00

NNE
NNE

7 / 14 mph 63 / 63°F 92% 1019 mb
Low level cloud: 11%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
06:00

WNW
WNW

6 / 12 mph 69 / 69°F 85% 1023 mb
Low level cloud: 6%
Mid level cloud: 9%
High level cloud: 11%
Most Significant Cloud Type: low
10%
0.0 In
12:00

ENE
ENE

13 / 28 mph 71 / 71°F 65% 1016 mb
Low level cloud: 36%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: low
38%
0.0 In
18:00

WNW
WNW

9 / 18 mph 77 / 80°F 67% 1021 mb
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 9%
Most Significant Cloud Type: low
8%
0.0 In
Tue 25
Jun
00:00

ENE
ENE

8 / 17 mph 65 / 65°F 91% 1012 mb
Low level cloud: 4%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
06:00

W
W

6 / 12 mph 65 / 65°F 86% 1020 mb
Low level cloud: 7%
Mid level cloud: 11%
High level cloud: 74%
Most Significant Cloud Type: medium
34%
0.0 In
12:00

SE
SE

14 / 30 mph 71 / 71°F 72% 1009 mb
Low level cloud: 80%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.0 In
18:00

N
N

12 / 25 mph 69 / 69°F 68% 1020 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
Wed 26
Jun
00:00

SSE
SSE

5 / 10 mph 60 / 60°F 88% 1015 mb
Low level cloud: 39%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.1 In
06:00

NE
NE

4 / 8 mph 64 / 64°F 73% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: medium
3%
0.0 In
12:00

S
S

9 / 18 mph 73 / 77°F 66% 1018 mb
Low level cloud: 25%
Mid level cloud: 15%
High level cloud: 36%
Most Significant Cloud Type: low
34%
0.0 In
18:00

ENE
ENE

5 / 11 mph 65 / 65°F 72% 1023 mb
Low level cloud: 96%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Thu 27
Jun
00:00

ESE
ESE

13 / 28 mph 65 / 65°F 77% 1015 mb
Low level cloud: 0%
Mid level cloud: 62%
High level cloud: 33%
Most Significant Cloud Type: medium
64%
0.0 In
06:00

NNE
NNE

6 / 12 mph 59 / 59°F 74% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
14%
0.0 In
12:00

S
S

8 / 17 mph 63 / 63°F 94% 1015 mb
Low level cloud: 84%
Mid level cloud: 46%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.1 In
18:00

ESE
ESE

6 / 14 mph 74 / 77°F 56% 1022 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
Fri 28
Jun
00:00

SSE
SSE

6 / 12 mph 64 / 64°F 91% 1013 mb
Low level cloud: 18%
Mid level cloud: 20%
High level cloud: 9%
Most Significant Cloud Type: low
25%
0.0 In
06:00

ENE
ENE

5 / 10 mph 62 / 62°F 80% 1023 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 51%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

SSW
SSW

15 / 32 mph 64 / 64°F 78% 1013 mb
Low level cloud: 87%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

E
E

11 / 22 mph 66 / 66°F 59% 1022 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 17%
Most Significant Cloud Type: medium
44%
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.
(More Info)

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