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Fairford 14 Day Long Range Forecast

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

Gloucestershire, United Kingdom

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

For Fairford in the coming two weeks the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 20°C expected on the evening of Friday 17th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Monday 20th at 7°C. Expect the next 14 days have most days seeing a little rain. The indicators are that Wednesday 22nd will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Fri 17
May		03:00

SSE
SSE

 2 / 5 kts 51 / 51°F 93%
Low level cloud: 10%
Mid level cloud: 27%
High level cloud: 33%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 2 / 3 kts 54 / 53°F 90%
Low level cloud: 1%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 2 / 2 kts 62 / 60°F 76%
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 62%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 2 / 2 kts 67 / 65°F 66%
Low level cloud: 20%
Mid level cloud: 43%
High level cloud: 58%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 0 / 0 kts 68 / 66°F 62%
Low level cloud: 82%
Mid level cloud: 2%
High level cloud: 21%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 2 / 3 kts 69 / 66°F 75%
Low level cloud: 6%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 3 / 7 kts 55 / 55°F 88%
Low level cloud: 5%
Mid level cloud: 37%
High level cloud: 100%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

NNE
NNE

 3 / 6 kts 53 / 53°F 93%
Low level cloud: 8%
Mid level cloud: 26%
High level cloud: 77%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 4 / 9 kts 52 / 50°F 96%
Low level cloud: 62%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 6 / 9 kts 55 / 52°F 96%
Low level cloud: 54%
Mid level cloud: 46%
High level cloud: 68%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 9 / 10 kts 59 / 57°F 88%
Low level cloud: 97%
Mid level cloud: 49%
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

NNE
NNE

 7 / 9 kts 59 / 57°F 89%
Low level cloud: 93%
Mid level cloud: 60%
High level cloud: 35%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 6 / 8 kts 64 / 64°F 80%
Low level cloud: 97%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 6 / 10 kts 63 / 62°F 91%
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
88%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNE
NNE

 6 / 12 kts 55 / 53°F 96%
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 19
May		00:00

NNE
NNE

 5 / 11 kts 49 / 47°F 97%
Low level cloud: 32%
Mid level cloud: 8%
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

N
N

 5 / 11 kts 47 / 44°F 96%
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 6 / 10 kts 49 / 46°F 95%
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 9 / 10 kts 60 / 57°F 79%
Low level cloud: 22%
Mid level cloud: 1%
High level cloud: 12%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 10 / 11 kts 65 / 64°F 67%
Low level cloud: 50%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 10 / 13 kts 66 / 65°F 68%
Low level cloud: 22%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 9 / 12 kts 64 / 63°F 79%
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

 6 / 10 kts 55 / 52°F 94%
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
Mon 20
May		00:00

NNE
NNE

 7 / 13 kts 48 / 44°F 97%
Low level cloud: 53%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 7 / 12 kts 45 / 40°F 98%
Low level cloud: 77%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 7 / 10 kts 47 / 42°F 94%
Low level cloud: 51%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 10 / 12 kts 57 / 53°F 78%
Low level cloud: 44%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 11 / 12 kts 62 / 61°F 70%
Low level cloud: 62%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 10 / 12 kts 63 / 62°F 69%
Low level cloud: 30%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 8 / 12 kts 60 / 57°F 79%
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 5 / 10 kts 50 / 47°F 90%
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 70%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

NNE
NNE

 4 / 7 kts 49 / 47°F 90%
Low level cloud: 85%
Mid level cloud: 89%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 4 / 6 kts 49 / 47°F 95%
Low level cloud: 89%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 3 / 5 kts 49 / 47°F 96%
Low level cloud: 100%
Mid level cloud: 31%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 3 / 4 kts 52 / 51°F 93%
Low level cloud: 88%
Mid level cloud: 31%
High level cloud: 27%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 3 / 4 kts 55 / 55°F 89%
Low level cloud: 91%
Mid level cloud: 19%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 2 / 2 kts 60 / 60°F 81%
Low level cloud: 72%
Mid level cloud: 15%
High level cloud: 41%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 1 / 1 kts 64 / 60°F 79%
Low level cloud: 53%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 2 / 5 kts 55 / 55°F 92%
Low level cloud: 32%
Mid level cloud: 100%
High level cloud: 30%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

W
W

 3 / 7 kts 53 / 52°F 93%
Low level cloud: 10%
Mid level cloud: 76%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 5 / 10 kts 51 / 49°F 95%
Low level cloud: 8%
Mid level cloud: 60%
High level cloud: 48%
Most Significant Cloud Type: medium
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 6 / 10 kts 53 / 49°F 95%
Low level cloud: 26%
Mid level cloud: 59%
High level cloud: 21%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 7 / 8 kts 57 / 55°F 87%
Low level cloud: 90%
Mid level cloud: 47%
High level cloud: 44%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 8 / 10 kts 60 / 60°F 84%
Low level cloud: 85%
Mid level cloud: 89%
High level cloud: 59%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 9 / 12 kts 63 / 62°F 78%
Low level cloud: 54%
Mid level cloud: 74%
High level cloud: 61%
Most Significant Cloud Type: low
86%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

 7 / 12 kts 60 / 57°F 89%
Low level cloud: 10%
Mid level cloud: 25%
High level cloud: 56%
Most Significant Cloud Type: low
25%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

W
W

 6 / 13 kts 53 / 49°F 95%
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 9%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		00:00

W
W

 4 / 9 kts 49 / 47°F 94%
Low level cloud: 6%
Mid level cloud: 13%
High level cloud: 13%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 2 / 5 kts 47 / 46°F 94%
Low level cloud: 11%
Mid level cloud: 20%
High level cloud: 15%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 2 / 3 kts 51 / 50°F 93%
Low level cloud: 53%
Mid level cloud: 63%
High level cloud: 17%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 5 / 6 kts 59 / 58°F 81%
Low level cloud: 86%
Mid level cloud: 16%
High level cloud: 17%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

 6 / 8 kts 60 / 60°F 79%
Low level cloud: 80%
Mid level cloud: 95%
High level cloud: 48%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

 5 / 7 kts 61 / 61°F 82%
Low level cloud: 18%
Mid level cloud: 100%
High level cloud: 97%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NNW
NNW

 3 / 5 kts 59 / 59°F 87%
Low level cloud: 9%
Mid level cloud: 95%
High level cloud: 79%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNW
NNW

 6 / 13 kts 55 / 51°F 93%
Low level cloud: 4%
Mid level cloud: 29%
High level cloud: 35%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Fri 24
May		00:00

NNW
NNW

 6 / 13 kts 50 / 46°F 97%
Low level cloud: 85%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NE
NE

 2 / 5 kts 53 / 53°F 87%
Low level cloud: 5%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: medium
68%
0.0 In
12:00

ENE
ENE

 9 / 19 kts 57 / 55°F 90%
Low level cloud: 94%
Mid level cloud: 45%
High level cloud: 45%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

 5 / 11 kts 64 / 64°F 87%
Low level cloud: 17%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
Sat 25
May		00:00

NNE
NNE

 11 / 24 kts 52 / 48°F 97%
Low level cloud: 77%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
06:00

WNW
WNW

 3 / 6 kts 59 / 59°F 93%
Low level cloud: 17%
Mid level cloud: 9%
High level cloud: 3%
Most Significant Cloud Type: low
20%
0.0 In
12:00

ENE
ENE

 13 / 28 kts 65 / 65°F 75%
Low level cloud: 39%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.0 In
18:00

WSW
WSW

 9 / 20 kts 61 / 61°F 86%
Low level cloud: 18%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
33%
0.0 In
Sun 26
May		00:00

ENE
ENE

 8 / 17 kts 51 / 47°F 97%
Low level cloud: 37%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.0 In
06:00

WSW
WSW

 7 / 16 kts 57 / 55°F 99%
Low level cloud: 93%
Mid level cloud: 86%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
12:00

E
E

 11 / 24 kts 61 / 61°F 91%
Low level cloud: 91%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
18:00

W
W

 5 / 11 kts 64 / 64°F 91%
Low level cloud: 51%
Mid level cloud: 72%
High level cloud: 2%
Most Significant Cloud Type: low
76%
0.1 In
Mon 27
May		00:00

NE
NE

 4 / 9 kts 54 / 53°F 97%
Low level cloud: 98%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
06:00

NW
NW

 2 / 5 kts 55 / 56°F 85%
Low level cloud: 6%
Mid level cloud: 20%
High level cloud: 5%
Most Significant Cloud Type: medium
36%
0.0 In
12:00

NE
NE

 13 / 28 kts 65 / 65°F 69%
Low level cloud: 48%
Mid level cloud: 18%
High level cloud: 20%
Most Significant Cloud Type: low
56%
0.0 In
18:00

SW
SW

 5 / 10 kts 68 / 68°F 85%
Low level cloud: 42%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
Tue 28
May		00:00

NNE
NNE

 5 / 12 kts 49 / 46°F 91%
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 32%
Most Significant Cloud Type: medium
29%
0.0 In
06:00

SSW
SSW

 5 / 11 kts 59 / 58°F 95%
Low level cloud: 88%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NE
NE

 5 / 11 kts 66 / 66°F 65%
Low level cloud: 8%
Mid level cloud: 6%
High level cloud: 7%
Most Significant Cloud Type: low
10%
0.0 In
18:00

NNW
NNW

 8 / 18 kts 48 / 44°F 96%
Low level cloud: 73%
Mid level cloud: 64%
High level cloud: 21%
Most Significant Cloud Type: low
97%
0.2 In
Wed 29
May		00:00

ENE
ENE

 5 / 11 kts 50 / 48°F 97%
Low level cloud: 33%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
06:00

WNW
WNW

 8 / 18 kts 46 / 40°F 94%
Low level cloud: 22%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.0 In
12:00

NE
NE

 6 / 14 kts 64 / 64°F 70%
Low level cloud: 52%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
18:00

WNW
WNW

 9 / 19 kts 55 / 52°F 79%
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
Thu 30
May		00:00

NE
NE

 6 / 12 kts 51 / 48°F 98%
Low level cloud: 54%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WNW
WNW

 6 / 13 kts 48 / 44°F 90%
Low level cloud: 7%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
12:00

ENE
ENE

 11 / 23 kts 67 / 67°F 72%
Low level cloud: 82%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
18:00

WSW
WSW

 5 / 10 kts 60 / 60°F 77%
Low level cloud: 21%
Mid level cloud: 28%
High level cloud: 22%
Most Significant Cloud Type: low
33%
0.0 In
Fri 31
May		00:00

NNE
NNE

 9 / 19 kts 50 / 46°F 96%
Low level cloud: 22%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.0 In
06:00

SSW
SSW

 10 / 21 kts 50 / 46°F 93%
Low level cloud: 40%
Mid level cloud: 77%
High level cloud: 77%
Most Significant Cloud Type: low
75%
0.0 In
12:00

NE
NE

 13 / 28 kts 65 / 65°F 69%
Low level cloud: 36%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
18:00

SSW
SSW

 7 / 16 kts 56 / 54°F 98%
Low level cloud: 91%
Mid level cloud: 66%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
Sat 01
Jun		00:00

N
N

 8 / 17 kts 48 / 43°F 92%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: medium
4%
0.0 In
06:00

SW
SW

 5 / 10 kts 52 / 50°F 96%
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
12:00

NNE
NNE

 13 / 28 kts 62 / 62°F 70%
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 19%
Most Significant Cloud Type: medium
73%
0.0 In
18:00

SSW
SSW

 12 / 26 kts 55 / 51°F 83%
Low level cloud: 6%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
35%
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