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Great Chesterford 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Great Chesterford

Essex, United Kingdom

Long range weather outlook for Great Chesterford includes 14 day forecast summary:

Taking a look at Great Chesterford over the coming two weeks and the average daytime maximum temperature will be around 21°C, with a high for the two weeks of 25°C expected on the afternoon of Thursday 27th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Monday 17th at 8°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. The current forecast indicates Friday 21st will have the most precipitation with an accumulation of around 26.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 17
Jun		18:00

WNW
WNW

 7 / 10 mph 66 / 63°F 84% 1011 mb
Low level cloud: 8%
Mid level cloud: 33%
High level cloud: 18%
Most Significant Cloud Type: medium
56%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NW
NW

 5 / 11 mph 58 / 55°F 91% 1012 mb
Low level cloud: 5%
Mid level cloud: 27%
High level cloud: 32%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 18
Jun		00:00

NW
NW

 6 / 11 mph 53 / 51°F 93% 1013 mb
Low level cloud: 5%
Mid level cloud: 20%
High level cloud: 99%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 5 / 10 mph 50 / 48°F 94% 1014 mb
Low level cloud: 3%
Mid level cloud: 14%
High level cloud: 18%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 6 / 9 mph 54 / 50°F 91% 1014 mb
Low level cloud: 8%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 6 / 7 mph 63 / 60°F 76% 1015 mb
Low level cloud: 27%
Mid level cloud: 6%
High level cloud: 64%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 6 / 7 mph 69 / 65°F 66% 1014 mb
Low level cloud: 50%
Mid level cloud: 5%
High level cloud: 81%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

 9 / 13 mph 66 / 63°F 77% 1014 mb
Low level cloud: 41%
Mid level cloud: 15%
High level cloud: 57%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 11 / 15 mph 62 / 61°F 86% 1015 mb
Low level cloud: 3%
Mid level cloud: 13%
High level cloud: 21%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 10 / 17 mph 54 / 50°F 97% 1017 mb
Low level cloud: 53%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 19
Jun		00:00

NNE
NNE

 8 / 14 mph 49 / 46°F 98% 1019 mb
Low level cloud: 49%
Mid level cloud: 4%
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

 7 / 13 mph 48 / 45°F 99% 1019 mb
Low level cloud: 79%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 10 / 14 mph 53 / 48°F 94% 1020 mb
Low level cloud: 68%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 11 / 13 mph 60 / 56°F 73% 1021 mb
Low level cloud: 57%
Mid level cloud: 3%
High level cloud: 51%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 9 / 11 mph 65 / 63°F 63% 1022 mb
Low level cloud: 23%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 8 / 10 mph 66 / 64°F 62% 1022 mb
Low level cloud: 22%
Mid level cloud: 0%
High level cloud: 88%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 7 / 10 mph 64 / 62°F 74% 1022 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 32%
Most Significant Cloud Type: high
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 7 / 14 mph 54 / 50°F 88% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 20
Jun		00:00

ESE
ESE

 4 / 8 mph 51 / 49°F 77% 1023 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 4 / 7 mph 48 / 47°F 67% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 4 / 6 mph 52 / 50°F 71% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 81%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 7 / 8 mph 62 / 60°F 58% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 9 / 10 mph 68 / 66°F 52% 1020 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 88%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 7 / 9 mph 69 / 67°F 54% 1019 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

ENE
ENE

 8 / 12 mph 66 / 64°F 71% 1018 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 19%
Most Significant Cloud Type: high
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 8 / 16 mph 55 / 52°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 21
Jun		00:00

NNE
NNE

 9 / 16 mph 52 / 49°F 77% 1015 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 14%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 11 / 19 mph 53 / 49°F 79% 1012 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 12 / 19 mph 54 / 50°F 95% 1009 mb
Low level cloud: 86%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

N
N

 17 / 25 mph 55 / 50°F 98% 1008 mb
Low level cloud: 99%
Mid level cloud: 43%
High level cloud: 93%
Most Significant Cloud Type: low
100%
Expect 0.8 In of precipitation over the past 3 hours.
0.8 In
12:00

NNW
NNW

 16 / 23 mph 55 / 51°F 98% 1007 mb
Low level cloud: 100%
Mid level cloud: 72%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NW
NW

 14 / 20 mph 56 / 52°F 97% 1008 mb
Low level cloud: 99%
Mid level cloud: 45%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 12 / 18 mph 58 / 54°F 94% 1009 mb
Low level cloud: 66%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 5 / 9 mph 56 / 54°F 95% 1010 mb
Low level cloud: 26%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 22
Jun		00:00

WSW
WSW

 11 / 21 mph 53 / 50°F 93% 1011 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 10 / 19 mph 52 / 48°F 96% 1011 mb
Low level cloud: 24%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 12 / 17 mph 56 / 52°F 95% 1011 mb
Low level cloud: 73%
Mid level cloud: 45%
High level cloud: 18%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 13 / 17 mph 61 / 60°F 87% 1011 mb
Low level cloud: 82%
Mid level cloud: 32%
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

W
W

 12 / 16 mph 64 / 64°F 79% 1012 mb
Low level cloud: 80%
Mid level cloud: 37%
High level cloud: 18%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 11 / 14 mph 65 / 64°F 75% 1013 mb
Low level cloud: 53%
Mid level cloud: 27%
High level cloud: 2%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 6 / 9 mph 65 / 62°F 83% 1013 mb
Low level cloud: 18%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 6 / 13 mph 57 / 53°F 87% 1014 mb
Low level cloud: 9%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 23
Jun		00:00

W
W

 7 / 15 mph 51 / 49°F 91% 1015 mb
Low level cloud: 50%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 7 / 14 mph 49 / 46°F 94% 1015 mb
Low level cloud: 5%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 6 / 9 mph 55 / 51°F 91% 1016 mb
Low level cloud: 13%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 7 / 8 mph 64 / 62°F 73% 1017 mb
Low level cloud: 7%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 7 / 9 mph 68 / 67°F 63% 1017 mb
Low level cloud: 64%
Mid level cloud: 41%
High level cloud: 4%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 8 / 11 mph 70 / 68°F 66% 1016 mb
Low level cloud: 39%
Mid level cloud: 30%
High level cloud: 5%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 8 / 11 mph 68 / 66°F 79% 1017 mb
Low level cloud: 7%
Mid level cloud: 28%
High level cloud: 13%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 5 / 10 mph 63 / 60°F 87% 1018 mb
Low level cloud: 2%
Mid level cloud: 23%
High level cloud: 1%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 24
Jun		00:00

E
E

 3 / 7 mph 56 / 56°F 95% 1020 mb
Low level cloud: 16%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: medium
91%
0.0 In
06:00

NNW
NNW

 9 / 20 mph 51 / 47°F 89% 1015 mb
Low level cloud: 64%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: low
66%
0.0 In
12:00

SW
SW

 13 / 25 mph 70 / 70°F 77% 1018 mb
Low level cloud: 72%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: low
78%
0.0 In
18:00

SW
SW

 11 / 24 mph 71 / 71°F 78% 1015 mb
Low level cloud: 12%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
14%
0.0 In
Tue 25
Jun		00:00

SSE
SSE

 6 / 12 mph 58 / 58°F 95% 1023 mb
Low level cloud: 26%
Mid level cloud: 6%
High level cloud: 14%
Most Significant Cloud Type: low
30%
0.0 In
06:00

WSW
WSW

 6 / 12 mph 60 / 60°F 82% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
7%
0.0 In
12:00

SE
SE

 11 / 23 mph 71 / 71°F 61% 1016 mb
Low level cloud: 69%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
68%
0.0 In
18:00

NE
NE

 9 / 18 mph 66 / 66°F 69% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
0.0 In
Wed 26
Jun		00:00

E
E

 6 / 13 mph 54 / 53°F 89% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NNE
NNE

 5 / 10 mph 55 / 54°F 85% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

ENE
ENE

 8 / 17 mph 69 / 69°F 56% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NNE
NNE

 10 / 19 mph 65 / 65°F 73% 1022 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 27
Jun		00:00

NE
NE

 6 / 12 mph 53 / 51°F 92% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NNE
NNE

 7 / 13 mph 55 / 54°F 90% 1022 mb
Low level cloud: 32%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
12:00

E
E

 8 / 16 mph 74 / 77°F 66% 1019 mb
Low level cloud: 69%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
68%
0.0 In
18:00

NE
NE

 8 / 16 mph 67 / 67°F 75% 1020 mb
Low level cloud: 7%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: low
12%
0.0 In
Fri 28
Jun		00:00

ENE
ENE

 6 / 13 mph 60 / 60°F 94% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

NE
NE

 2 / 4 mph 61 / 61°F 77% 1020 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 18%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

ENE
ENE

 10 / 20 mph 75 / 78°F 60% 1016 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
3%
0.0 In
18:00

ESE
ESE

 4 / 7 mph 76 / 78°F 64% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
0.0 In
Sat 29
Jun		00:00

NE
NE

 7 / 15 mph 60 / 60°F 93% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 41%
Most Significant Cloud Type: high
40%
0.0 In
06:00

ESE
ESE

 3 / 5 mph 63 / 63°F 73% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NE
NE

 14 / 30 mph 73 / 77°F 67% 1018 mb
Low level cloud: 39%
Mid level cloud: 4%
High level cloud: 52%
Most Significant Cloud Type: low
46%
0.0 In
18:00

ESE
ESE

 9 / 16 mph 70 / 70°F 69% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 30
Jun		00:00

NNE
NNE

 12 / 26 mph 54 / 50°F 87% 1020 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 21%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

NE
NE

 6 / 13 mph 59 / 58°F 81% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 13%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

NNE
NNE

 15 / 32 mph 62 / 62°F 78% 1020 mb
Low level cloud: 94%
Mid level cloud: 15%
High level cloud: 69%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

 9 / 18 mph 70 / 70°F 68% 1008 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
0.0 In
Mon 01
Jul		00:00

N
N

 7 / 15 mph 48 / 45°F 96% 1019 mb
Low level cloud: 21%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
06:00

N
N

 7 / 15 mph 60 / 60°F 91% 1005 mb
Low level cloud: 33%
Mid level cloud: 77%
High level cloud: 6%
Most Significant Cloud Type: low
61%
0.0 In
12:00

NNE
NNE

 10 / 21 mph 59 / 60°F 60% 1015 mb
Low level cloud: 18%
Mid level cloud: 6%
High level cloud: 80%
Most Significant Cloud Type: low
29%
0.0 In
18:00

ESE
ESE

 8 / 17 mph 70 / 70°F 83% 1002 mb
Low level cloud: 33%
Mid level cloud: 45%
High level cloud: 98%
Most Significant Cloud Type: low
60%
0.3 In
Tue 02
Jul		00:00

NE
NE

 4 / 9 mph 53 / 52°F 85% 1013 mb
Low level cloud: 1%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: medium
68%
0.0 In
06:00

SSW
SSW

 7 / 14 mph 64 / 64°F 95% 999 mb
Low level cloud: 56%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
71%
0.1 In
12:00

NNW
NNW

 3 / 6 mph 66 / 66°F 61% 1014 mb
Low level cloud: 20%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
18:00

S
S

 16 / 33 mph 60 / 60°F 88% 997 mb
Low level cloud: 94%
Mid level cloud: 91%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.1 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