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Horton 14 Day Long Range Forecast

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

Northamptonshire, United Kingdom

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

Over the next 14 days the Horton forecast suggests the average daytime maximum temperature will be around 5°C, with a high for the two weeks of 10°C expected on the afternoon of Saturday 16th. The mean minimum temperature will be 1°C, dipping to its lowest on the morning of Friday 22nd at -3°C. The coming 14 days will have some days seeing a little precipitation and some days with rain. It looks like Sunday 24th will have the most precipitation with an accumulation of around 31.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 15
Nov		15:00

WSW
WSW

 7 / 9 mph 47 / 44°F 83% 1025 mb
Low level cloud: 1%
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
18:00

WSW
WSW

 7 / 14 mph 41 / 37°F 93% 1025 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 7 / 15 mph 40 / 34°F 94% 1024 mb
Low level cloud: 20%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 16
Nov		00:00

WSW
WSW

 8 / 16 mph 39 / 33°F 95% 1023 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 8 / 16 mph 39 / 33°F 95% 1021 mb
Low level cloud: 31%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 8 / 16 mph 39 / 33°F 94% 1020 mb
Low level cloud: 52%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 9 / 15 mph 45 / 40°F 90% 1020 mb
Low level cloud: 98%
Mid level cloud: 15%
High level cloud: 73%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 9 / 12 mph 49 / 45°F 88% 1018 mb
Low level cloud: 87%
Mid level cloud: 46%
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

WSW
WSW

 9 / 14 mph 49 / 45°F 92% 1016 mb
Low level cloud: 69%
Mid level cloud: 55%
High level cloud: 3%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 9 / 12 mph 47 / 43°F 91% 1017 mb
Low level cloud: 97%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 7 / 11 mph 46 / 42°F 82% 1017 mb
Low level cloud: 91%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 17
Nov		00:00

WNW
WNW

 8 / 14 mph 43 / 38°F 83% 1016 mb
Low level cloud: 37%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 10 / 16 mph 44 / 38°F 81% 1015 mb
Low level cloud: 7%
Mid level cloud: 44%
High level cloud: 20%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 12 / 17 mph 44 / 37°F 83% 1014 mb
Low level cloud: 98%
Mid level cloud: 99%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 11 / 15 mph 45 / 39°F 81% 1015 mb
Low level cloud: 14%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 14 / 16 mph 48 / 42°F 68% 1015 mb
Low level cloud: 3%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 13 / 18 mph 45 / 39°F 72% 1015 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 10 / 17 mph 41 / 34°F 81% 1016 mb
Low level cloud: 21%
Mid level cloud: 43%
High level cloud: 12%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 8 / 15 mph 37 / 31°F 90% 1018 mb
Low level cloud: 2%
Mid level cloud: 31%
High level cloud: 6%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 18
Nov		00:00

W
W

 6 / 10 mph 37 / 32°F 92% 1017 mb
Low level cloud: 9%
Mid level cloud: 25%
High level cloud: 7%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 5 / 10 mph 36 / 31°F 94% 1016 mb
Low level cloud: 25%
Mid level cloud: 44%
High level cloud: 15%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 7 / 13 mph 34 / 28°F 96% 1012 mb
Low level cloud: 99%
Mid level cloud: 62%
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

E
E

 13 / 16 mph 37 / 28°F 98% 1009 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
12:00

ENE
ENE

 9 / 11 mph 40 / 34°F 98% 1006 mb
Low level cloud: 100%
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
15:00

ENE
ENE

 6 / 7 mph 41 / 37°F 99% 1003 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 5 / 8 mph 40 / 37°F 99% 999 mb
Low level cloud: 100%
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
21:00

NNE
NNE

 12 / 14 mph 38 / 30°F 98% 999 mb
Low level cloud: 99%
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
Tue 19
Nov		00:00

N
N

 12 / 15 mph 36 / 28°F 97% 1000 mb
Low level cloud: 100%
Mid level cloud: 90%
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

NNW
NNW

 13 / 15 mph 36 / 28°F 97% 1003 mb
Low level cloud: 96%
Mid level cloud: 72%
High level cloud: 78%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 16 / 20 mph 35 / 25°F 92% 1005 mb
Low level cloud: 100%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 10 / 13 mph 34 / 26°F 91% 1008 mb
Low level cloud: 17%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 12 / 13 mph 38 / 31°F 69% 1009 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 9 / 10 mph 36 / 30°F 79% 1009 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 6 / 13 mph 30 / 24°F 84% 1009 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 6 / 12 mph 30 / 23°F 82% 1010 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 20
Nov		00:00

NW
NW

 6 / 13 mph 29 / 22°F 79% 1010 mb
Low level cloud: 0%
Mid level cloud: 100%
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

WNW
WNW

 8 / 16 mph 29 / 21°F 79% 1010 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 7 / 14 mph 28 / 21°F 81% 1010 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 9 / 13 mph 33 / 26°F 78% 1010 mb
Low level cloud: 16%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 14 / 16 mph 39 / 31°F 68% 1010 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 15 / 20 mph 36 / 27°F 76% 1010 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 12 / 18 mph 33 / 24°F 86% 1011 mb
Low level cloud: 16%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 11 / 20 mph 31 / 22°F 79% 1011 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 21
Nov		00:00

W
W

 12 / 19 mph 32 / 23°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 11 / 21 mph 31 / 22°F 75% 1009 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 90%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 10 / 20 mph 30 / 21°F 73% 1007 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 6 / 12 mph 33 / 27°F 72% 1005 mb
Low level cloud: 4%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: medium
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 4 / 6 mph 36 / 33°F 65% 1001 mb
Low level cloud: 38%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

 7 / 8 mph 38 / 33°F 82% 999 mb
Low level cloud: 18%
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
18:00

NNW
NNW

 12 / 15 mph 36 / 28°F 84% 1000 mb
Low level cloud: 10%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: medium
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 15 / 25 mph 34 / 24°F 79% 1003 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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 22
Nov		00:00

NW
NW

 16 / 21 mph 38 / 29°F 94% 1002 mb
Low level cloud: 73%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

 9 / 18 mph 24 / 15°F 94% 1012 mb
Low level cloud: 18%
Mid level cloud: 8%
High level cloud: 19%
Most Significant Cloud Type: low
22%
0.0 In
12:00

WSW
WSW

 12 / 15 mph 38 / 31°F 84% 1010 mb
Low level cloud: 12%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
18:00

WNW
WNW

 8 / 15 mph 29 / 22°F 92% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
Sat 23
Nov		00:00

SW
SW

 4 / 9 mph 28 / 22°F 95% 1022 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 35%
Most Significant Cloud Type: high
34%
0.0 In
06:00

SW
SW

 8 / 17 mph 33 / 26°F 93% 1011 mb
Low level cloud: 80%
Mid level cloud: 43%
High level cloud: 55%
Most Significant Cloud Type: low
100%
0.0 In
12:00

E
E

 7 / 11 mph 36 / 31°F 88% 1009 mb
Low level cloud: 29%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

NNW
NNW

 12 / 21 mph 34 / 26°F 96% 998 mb
Low level cloud: 93%
Mid level cloud: 11%
High level cloud: 75%
Most Significant Cloud Type: low
100%
0.0 In
Sun 24
Nov		00:00

ENE
ENE

 16 / 24 mph 36 / 27°F 98% 1005 mb
Low level cloud: 100%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
06:00

ENE
ENE

 9 / 18 mph 31 / 24°F 96% 1009 mb
Low level cloud: 46%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
92%
0.0 In
12:00

ESE
ESE

 12 / 21 mph 40 / 33°F 99% 999 mb
Low level cloud: 100%
Mid level cloud: 29%
High level cloud: 36%
Most Significant Cloud Type: low
100%
0.7 In
18:00

E
E

 22 / 32 mph 36 / 24°F 100% 1000 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.9 In
Mon 25
Nov		00:00

S
S

 21 / 34 mph 55 / 51°F 89% 991 mb
Low level cloud: 93%
Mid level cloud: 66%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SSE
SSE

 12 / 25 mph 43 / 37°F 94% 989 mb
Low level cloud: 1%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: medium
76%
0.3 In
12:00

S
S

 26 / 39 mph 59 / 59°F 76% 984 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 58%
Most Significant Cloud Type: low
100%
0.0 In
18:00

S
S

 25 / 38 mph 57 / 52°F 86% 984 mb
Low level cloud: 90%
Mid level cloud: 100%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.0 In
Tue 26
Nov		00:00

SSW
SSW

 23 / 36 mph 47 / 38°F 79% 992 mb
Low level cloud: 42%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
06:00

SSW
SSW

 15 / 25 mph 43 / 36°F 81% 989 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 8%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

S
S

 15 / 24 mph 50 / 45°F 75% 992 mb
Low level cloud: 9%
Mid level cloud: 9%
High level cloud: 94%
Most Significant Cloud Type: medium
36%
0.0 In
18:00

SSW
SSW

 25 / 37 mph 48 / 40°F 78% 991 mb
Low level cloud: 94%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Wed 27
Nov		00:00

SSE
SSE

 15 / 23 mph 46 / 39°F 85% 989 mb
Low level cloud: 28%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
55%
0.0 In
06:00

S
S

 11 / 19 mph 40 / 33°F 90% 990 mb
Low level cloud: 46%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
93%
0.0 In
12:00

S
S

 6 / 10 mph 50 / 47°F 90% 983 mb
Low level cloud: 41%
Mid level cloud: 46%
High level cloud: 38%
Most Significant Cloud Type: low
61%
0.2 In
18:00

WSW
WSW

 20 / 30 mph 44 / 36°F 80% 991 mb
Low level cloud: 81%
Mid level cloud: 31%
High level cloud: 1%
Most Significant Cloud Type: low
91%
0.3 In
Thu 28
Nov		00:00

W
W

 9 / 16 mph 46 / 41°F 93% 989 mb
Low level cloud: 17%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: medium
98%
0.1 In
06:00

WSW
WSW

 8 / 16 mph 39 / 33°F 89% 999 mb
Low level cloud: 83%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NW
NW

 15 / 28 mph 39 / 31°F 96% 998 mb
Low level cloud: 95%
Mid level cloud: 57%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

N
N

 4 / 7 mph 45 / 42°F 83% 1008 mb
Low level cloud: 42%
Mid level cloud: 93%
High level cloud: 62%
Most Significant Cloud Type: low
81%
0.0 In
Fri 29
Nov		00:00

WSW
WSW

 8 / 16 mph 33 / 26°F 86% 1007 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
06:00

ENE
ENE

 12 / 20 mph 38 / 30°F 89% 1008 mb
Low level cloud: 94%
Mid level cloud: 48%
High level cloud: 21%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

 14 / 26 mph 41 / 33°F 80% 1009 mb
Low level cloud: 42%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
18:00

ENE
ENE

 23 / 35 mph 42 / 33°F 91% 1005 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Sat 30
Nov		00:00

NW
NW

 13 / 25 mph 33 / 23°F 83% 1019 mb
Low level cloud: 14%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.0 In
06:00

ENE
ENE

 16 / 26 mph 41 / 32°F 91% 1012 mb
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.4 In
12:00

NNE
NNE

 11 / 20 mph 41 / 35°F 78% 1024 mb
Low level cloud: 9%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
18:00

NE
NE

 11 / 17 mph 43 / 37°F 82% 1022 mb
Low level cloud: 100%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
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