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Little Gaddesden 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Little Gaddesden

Hertfordshire, United Kingdom

Long range weather outlook for Little Gaddesden includes 14 day forecast summary:

The forecast for Little Gaddesden in the coming two weeks is predicting the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 22°C expected on the afternoon of Monday 12th. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Thursday 15th at 4°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The current forecast indicates Monday 12th will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 12
May		18:00

ESE
ESE

 7 / 11 mph 68 / 65°F 79% 1012 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 6%
Most Significant Cloud Type: medium
9%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SE
SE

 4 / 6 mph 57 / 57°F 92% 1014 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 18%
Most Significant Cloud Type: medium
20%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Tue 13
May		00:00

ENE
ENE

 3 / 6 mph 54 / 54°F 93% 1015 mb
Low level cloud: 2%
Mid level cloud: 17%
High level cloud: 33%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 5 / 10 mph 52 / 51°F 95% 1016 mb
Low level cloud: 6%
Mid level cloud: 15%
High level cloud: 11%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 6 / 11 mph 54 / 50°F 92% 1018 mb
Low level cloud: 2%
Mid level cloud: 13%
High level cloud: 7%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 10 / 13 mph 62 / 61°F 69% 1018 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 7%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 11 / 13 mph 68 / 67°F 58% 1018 mb
Low level cloud: 3%
Mid level cloud: 14%
High level cloud: 8%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 14 / 18 mph 68 / 67°F 59% 1018 mb
Low level cloud: 23%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 11 / 15 mph 64 / 62°F 68% 1019 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 8 / 9 mph 57 / 56°F 84% 1020 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 14
May		00:00

NE
NE

 8 / 11 mph 51 / 48°F 90% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 7 / 14 mph 46 / 42°F 91% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 9 / 14 mph 47 / 43°F 83% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 11 / 13 mph 59 / 56°F 61% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 11 / 13 mph 65 / 64°F 52% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 12 / 15 mph 66 / 65°F 52% 1021 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 41%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 13 / 19 mph 59 / 56°F 70% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 9 / 15 mph 49 / 45°F 91% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 15
May		00:00

NNE
NNE

 7 / 13 mph 44 / 40°F 95% 1024 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 7 / 13 mph 42 / 37°F 96% 1024 mb
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 9 / 14 mph 44 / 38°F 90% 1025 mb
Low level cloud: 41%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 12 / 14 mph 54 / 49°F 68% 1025 mb
Low level cloud: 10%
Mid level cloud: 1%
High level cloud: 48%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 13 / 15 mph 59 / 56°F 61% 1024 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 31%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 13 / 16 mph 63 / 62°F 61% 1023 mb
Low level cloud: 45%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 12 / 16 mph 57 / 53°F 73% 1025 mb
Low level cloud: 19%
Mid level cloud: 1%
High level cloud: 1%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 7 / 11 mph 48 / 45°F 92% 1026 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 16
May		00:00

NNE
NNE

 7 / 13 mph 44 / 40°F 98% 1026 mb
Low level cloud: 52%
Mid level cloud: 1%
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

NNE
NNE

 7 / 12 mph 43 / 39°F 97% 1026 mb
Low level cloud: 7%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 8 / 13 mph 46 / 41°F 88% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 11 / 13 mph 57 / 53°F 57% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 10 / 12 mph 64 / 63°F 49% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 10 / 12 mph 66 / 65°F 52% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 7 / 9 mph 66 / 65°F 71% 1025 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 5 / 5 mph 58 / 58°F 85% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 17
May		00:00

NNW
NNW

 6 / 11 mph 49 / 47°F 93% 1026 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 7 / 13 mph 43 / 38°F 98% 1025 mb
Low level cloud: 77%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 12 / 18 mph 49 / 44°F 79% 1025 mb
Low level cloud: 99%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 12 / 16 mph 53 / 49°F 72% 1026 mb
Low level cloud: 100%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 11 / 13 mph 63 / 62°F 60% 1025 mb
Low level cloud: 20%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 13 / 16 mph 65 / 64°F 60% 1024 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 13 / 16 mph 61 / 60°F 69% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 8 / 10 mph 53 / 51°F 86% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 18
May		00:00

NNE
NNE

 7 / 11 mph 47 / 44°F 94% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 7 / 14 mph 44 / 40°F 94% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 8 / 13 mph 46 / 42°F 84% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 11 / 13 mph 57 / 54°F 60% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 12 / 13 mph 64 / 63°F 50% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 21%
Most Significant Cloud Type: high
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 12 / 15 mph 64 / 63°F 49% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 11 / 13 mph 61 / 60°F 69% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 7 / 10 mph 51 / 48°F 93% 1023 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 19
May		00:00

E
E

 2 / 3 mph 60 / 60°F 80% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
0.0 In
06:00

SSW
SSW

 10 / 19 mph 54 / 50°F 84% 1023 mb
Low level cloud: 47%
Mid level cloud: 34%
High level cloud: 6%
Most Significant Cloud Type: low
59%
0.0 In
12:00

NNE
NNE

 8 / 14 mph 66 / 66°F 56% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
18:00

W
W

 6 / 11 mph 74 / 77°F 67% 1021 mb
Low level cloud: 9%
Mid level cloud: 5%
High level cloud: 17%
Most Significant Cloud Type: low
12%
0.0 In
Tue 20
May		00:00

NE
NE

 13 / 28 mph 49 / 44°F 79% 1019 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
0.0 In
06:00

N
N

 6 / 12 mph 50 / 48°F 81% 1029 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
12:00

E
E

 12 / 25 mph 59 / 59°F 84% 1012 mb
Low level cloud: 55%
Mid level cloud: 90%
High level cloud: 95%
Most Significant Cloud Type: low
98%
0.0 In
18:00

ENE
ENE

 12 / 24 mph 70 / 70°F 63% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 21
May		00:00

NNE
NNE

 11 / 23 mph 45 / 39°F 97% 1016 mb
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
26%
0.0 In
06:00

NE
NE

 10 / 19 mph 52 / 49°F 80% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 45%
Most Significant Cloud Type: medium
10%
0.0 In
12:00

NNE
NNE

 10 / 21 mph 64 / 64°F 53% 1016 mb
Low level cloud: 17%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: low
18%
0.0 In
18:00

NE
NE

 14 / 27 mph 63 / 63°F 60% 1015 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 12%
Most Significant Cloud Type: medium
45%
0.0 In
Thu 22
May		00:00

SSE
SSE

 3 / 6 mph 55 / 55°F 85% 1016 mb
Low level cloud: 5%
Mid level cloud: 26%
High level cloud: 90%
Most Significant Cloud Type: medium
42%
0.0 In
06:00

NNE
NNE

 12 / 22 mph 49 / 44°F 87% 1017 mb
Low level cloud: 15%
Mid level cloud: 1%
High level cloud: 2%
Most Significant Cloud Type: low
15%
0.0 In
12:00

SSW
SSW

 5 / 10 mph 70 / 70°F 54% 1014 mb
Low level cloud: 11%
Mid level cloud: 22%
High level cloud: 8%
Most Significant Cloud Type: low
19%
0.0 In
18:00

ENE
ENE

 9 / 17 mph 63 / 64°F 60% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Fri 23
May		00:00

ESE
ESE

 8 / 16 mph 53 / 50°F 90% 1013 mb
Low level cloud: 3%
Mid level cloud: 54%
High level cloud: 34%
Most Significant Cloud Type: medium
62%
0.0 In
06:00

W
W

 3 / 5 mph 59 / 60°F 70% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

ESE
ESE

 11 / 21 mph 54 / 50°F 93% 1009 mb
Low level cloud: 40%
Mid level cloud: 64%
High level cloud: 92%
Most Significant Cloud Type: low
72%
0.1 In
18:00

W
W

 4 / 7 mph 70 / 70°F 65% 1015 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
0.0 In
Sat 24
May		00:00

ESE
ESE

 10 / 20 mph 55 / 52°F 97% 1001 mb
Low level cloud: 78%
Mid level cloud: 85%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.4 In
06:00

WNW
WNW

 4 / 9 mph 60 / 60°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

S
S

 17 / 35 mph 57 / 53°F 74% 999 mb
Low level cloud: 53%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

WNW
WNW

 6 / 13 mph 67 / 67°F 64% 1011 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 37%
Most Significant Cloud Type: medium
45%
0.0 In
Sun 25
May		00:00

SE
SE

 14 / 29 mph 52 / 48°F 89% 996 mb
Low level cloud: 95%
Mid level cloud: 72%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NW
NW

 6 / 13 mph 56 / 55°F 86% 1013 mb
Low level cloud: 26%
Mid level cloud: 33%
High level cloud: 57%
Most Significant Cloud Type: low
44%
0.0 In
12:00

NNE
NNE

 5 / 11 mph 59 / 59°F 82% 998 mb
Low level cloud: 67%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: low
82%
0.2 In
18:00

NW
NW

 6 / 13 mph 65 / 65°F 60% 1015 mb
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: low
4%
0.0 In
Mon 26
May		00:00

W
W

 7 / 15 mph 53 / 51°F 96% 1009 mb
Low level cloud: 21%
Mid level cloud: 13%
High level cloud: 4%
Most Significant Cloud Type: low
25%
0.2 In
06:00

WNW
WNW

 4 / 7 mph 52 / 52°F 68% 1017 mb
Low level cloud: 21%
Mid level cloud: 2%
High level cloud: 48%
Most Significant Cloud Type: low
27%
0.0 In
12:00

WSW
WSW

 9 / 20 mph 62 / 62°F 73% 1016 mb
Low level cloud: 52%
Mid level cloud: 22%
High level cloud: 67%
Most Significant Cloud Type: low
67%
0.0 In
18:00

WSW
WSW

 15 / 30 mph 58 / 55°F 66% 1012 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
Tue 27
May		00:00

SW
SW

 7 / 14 mph 52 / 49°F 92% 1020 mb
Low level cloud: 0%
Mid level cloud: 62%
High level cloud: 98%
Most Significant Cloud Type: medium
65%
0.0 In
06:00

W
W

 13 / 25 mph 50 / 45°F 88% 1010 mb
Low level cloud: 31%
Mid level cloud: 23%
High level cloud: 7%
Most Significant Cloud Type: low
39%
0.0 In
12:00

SSW
SSW

 15 / 32 mph 65 / 65°F 68% 1019 mb
Low level cloud: 74%
Mid level cloud: 32%
High level cloud: 33%
Most Significant Cloud Type: low
89%
0.0 In
18:00

NW
NW

 13 / 27 mph 57 / 53°F 55% 1011 mb
Low level cloud: 5%
Mid level cloud: 44%
High level cloud: 85%
Most Significant Cloud Type: medium
61%
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