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Whaddon 14 Day Long Range Forecast

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

Buckinghamshire, United Kingdom

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

The next 14 day outlook for Whaddon shows the average daytime maximum temperature will be around 20°C, with a high for the two weeks of 27°C expected on the afternoon of Wednesday 26th. The average minimum temperature will be 12°C, dipping to its lowest on the morning of Friday 28th at 8°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. It looks like Tuesday 2nd will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 23
Jun		18:00

W
W

 3 / 4 mph 73 / 69°F 82% 1019 mb
Low level cloud: 50%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 4 / 5 mph 71 / 67°F 86% 1020 mb
Low level cloud: 38%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 24
Jun		00:00

SSW
SSW

 4 / 8 mph 64 / 64°F 86% 1020 mb
Low level cloud: 35%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 5 / 9 mph 63 / 63°F 89% 1020 mb
Low level cloud: 35%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 4 / 7 mph 65 / 62°F 89% 1020 mb
Low level cloud: 61%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 4 / 5 mph 72 / 68°F 77% 1020 mb
Low level cloud: 18%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 6 / 7 mph 75 / 77°F 67% 1019 mb
Low level cloud: 82%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 5 / 6 mph 76 / 77°F 73% 1018 mb
Low level cloud: 28%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 1 / 2 mph 74 / 76°F 80% 1017 mb
Low level cloud: 81%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 1 / 2 mph 69 / 67°F 86% 1018 mb
Low level cloud: 76%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 25
Jun		00:00

SSW
SSW

 5 / 8 mph 66 / 65°F 89% 1017 mb
Low level cloud: 26%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 4 / 8 mph 61 / 61°F 95% 1017 mb
Low level cloud: 13%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 2 / 3 mph 66 / 63°F 90% 1017 mb
Low level cloud: 18%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

 3 / 4 mph 74 / 76°F 76% 1017 mb
Low level cloud: 44%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 5 / 5 mph 78 / 78°F 63% 1016 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 5 / 6 mph 79 / 78°F 65% 1015 mb
Low level cloud: 68%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 7 / 11 mph 75 / 77°F 79% 1015 mb
Low level cloud: 26%
Mid level cloud: 2%
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

ENE
ENE

 7 / 12 mph 68 / 66°F 93% 1015 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
Wed 26
Jun		00:00

ENE
ENE

 5 / 9 mph 61 / 61°F 95% 1015 mb
Low level cloud: 11%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 6 / 12 mph 57 / 56°F 96% 1014 mb
Low level cloud: 15%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 6 / 10 mph 62 / 59°F 90% 1014 mb
Low level cloud: 15%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 7 / 8 mph 71 / 68°F 80% 1012 mb
Low level cloud: 71%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 4 / 5 mph 75 / 77°F 73% 1011 mb
Low level cloud: 86%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 4 / 5 mph 80 / 79°F 69% 1009 mb
Low level cloud: 9%
Mid level cloud: 30%
High level cloud: 2%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 4 / 4 mph 79 / 79°F 78% 1008 mb
Low level cloud: 18%
Mid level cloud: 26%
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

SE
SE

 5 / 11 mph 70 / 67°F 89% 1008 mb
Low level cloud: 39%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 27
Jun		00:00

WSW
WSW

 6 / 13 mph 64 / 64°F 94% 1007 mb
Low level cloud: 10%
Mid level cloud: 27%
High level cloud: 19%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 7 / 13 mph 61 / 60°F 96% 1007 mb
Low level cloud: 19%
Mid level cloud: 15%
High level cloud: 98%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 6 / 8 mph 65 / 61°F 94% 1007 mb
Low level cloud: 33%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 8 / 10 mph 67 / 66°F 80% 1007 mb
Low level cloud: 60%
Mid level cloud: 45%
High level cloud: 35%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 9 / 11 mph 70 / 68°F 69% 1007 mb
Low level cloud: 46%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 10 / 13 mph 68 / 67°F 77% 1007 mb
Low level cloud: 64%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 6 / 9 mph 65 / 62°F 81% 1008 mb
Low level cloud: 9%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 11 / 18 mph 57 / 53°F 77% 1010 mb
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 28
Jun		00:00

W
W

 8 / 14 mph 51 / 48°F 90% 1012 mb
Low level cloud: 6%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 7 / 13 mph 48 / 45°F 95% 1013 mb
Low level cloud: 5%
Mid level cloud: 9%
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

WNW
WNW

 9 / 12 mph 53 / 48°F 87% 1015 mb
Low level cloud: 23%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 11 / 13 mph 60 / 59°F 70% 1016 mb
Low level cloud: 78%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 11 / 13 mph 65 / 63°F 57% 1017 mb
Low level cloud: 42%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 11 / 13 mph 67 / 65°F 54% 1017 mb
Low level cloud: 19%
Mid level cloud: 22%
High level cloud: 17%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 11 / 14 mph 65 / 63°F 70% 1018 mb
Low level cloud: 18%
Mid level cloud: 3%
High level cloud: 14%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 8 / 16 mph 55 / 51°F 81% 1019 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 93%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 29
Jun		00:00

SW
SW

 7 / 15 mph 50 / 47°F 84% 1019 mb
Low level cloud: 0%
Mid level cloud: 36%
High level cloud: 41%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 7 / 13 mph 50 / 48°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 11 / 16 mph 54 / 50°F 83% 1016 mb
Low level cloud: 4%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 16 / 20 mph 60 / 59°F 77% 1015 mb
Low level cloud: 50%
Mid level cloud: 87%
High level cloud: 33%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 16 / 22 mph 57 / 53°F 87% 1014 mb
Low level cloud: 96%
Mid level cloud: 82%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 17 / 23 mph 58 / 55°F 88% 1011 mb
Low level cloud: 93%
Mid level cloud: 45%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 16 / 24 mph 56 / 52°F 96% 1009 mb
Low level cloud: 99%
Mid level cloud: 96%
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

SSW
SSW

 16 / 25 mph 58 / 54°F 97% 1008 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 42%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 30
Jun		00:00

WNW
WNW

 11 / 24 mph 50 / 46°F 91% 1014 mb
Low level cloud: 80%
Mid level cloud: 31%
High level cloud: 31%
Most Significant Cloud Type: low
94%
0.0 In
06:00

SSW
SSW

 9 / 20 mph 56 / 54°F 89% 1016 mb
Low level cloud: 25%
Mid level cloud: 71%
High level cloud: 8%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

W
W

 11 / 23 mph 69 / 69°F 58% 1024 mb
Low level cloud: 4%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
18:00

NW
NW

 10 / 16 mph 69 / 69°F 67% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 20%
Most Significant Cloud Type: medium
11%
0.0 In
Mon 01
Jul		00:00

WNW
WNW

 9 / 19 mph 53 / 50°F 94% 1015 mb
Low level cloud: 28%
Mid level cloud: 95%
High level cloud: 36%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

W
W

 11 / 22 mph 51 / 47°F 88% 1011 mb
Low level cloud: 10%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
12:00

NW
NW

 13 / 28 mph 58 / 56°F 74% 1013 mb
Low level cloud: 90%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 12 / 24 mph 61 / 61°F 78% 1004 mb
Low level cloud: 2%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
0.0 In
Tue 02
Jul		00:00

SSW
SSW

 10 / 18 mph 49 / 45°F 97% 1004 mb
Low level cloud: 46%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
06:00

W
W

 15 / 31 mph 51 / 46°F 82% 1007 mb
Low level cloud: 86%
Mid level cloud: 90%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 10 / 20 mph 62 / 62°F 66% 1000 mb
Low level cloud: 83%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: low
94%
0.1 In
18:00

WNW
WNW

 13 / 26 mph 60 / 60°F 80% 1010 mb
Low level cloud: 26%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
41%
0.0 In
Wed 03
Jul		00:00

WSW
WSW

 11 / 22 mph 48 / 44°F 96% 1002 mb
Low level cloud: 27%
Mid level cloud: 98%
High level cloud: 91%
Most Significant Cloud Type: medium
100%
0.3 In
06:00

WSW
WSW

 9 / 20 mph 55 / 53°F 88% 1013 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 4%
Most Significant Cloud Type: high
3%
0.0 In
12:00

W
W

 17 / 35 mph 56 / 52°F 82% 1004 mb
Low level cloud: 83%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.0 In
18:00

WSW
WSW

 13 / 27 mph 66 / 66°F 83% 1013 mb
Low level cloud: 15%
Mid level cloud: 22%
High level cloud: 17%
Most Significant Cloud Type: low
25%
0.0 In
Thu 04
Jul		00:00

WSW
WSW

 14 / 30 mph 53 / 48°F 83% 1005 mb
Low level cloud: 9%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
06:00

WSW
WSW

 6 / 12 mph 59 / 59°F 93% 1016 mb
Low level cloud: 28%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
12:00

WNW
WNW

 17 / 35 mph 62 / 62°F 67% 1007 mb
Low level cloud: 84%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

 3 / 6 mph 72 / 76°F 73% 1015 mb
Low level cloud: 28%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
Fri 05
Jul		00:00

SSW
SSW

 12 / 24 mph 56 / 53°F 87% 1008 mb
Low level cloud: 57%
Mid level cloud: 87%
High level cloud: 3%
Most Significant Cloud Type: low
88%
0.0 In
06:00

NW
NW

 7 / 15 mph 56 / 54°F 86% 1017 mb
Low level cloud: 36%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: low
36%
0.0 In
12:00

SW
SW

 16 / 34 mph 61 / 61°F 81% 1005 mb
Low level cloud: 62%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
90%
0.0 In
18:00

WNW
WNW

 9 / 20 mph 65 / 65°F 72% 1016 mb
Low level cloud: 2%
Mid level cloud: 30%
High level cloud: 27%
Most Significant Cloud Type: medium
35%
0.0 In
Sat 06
Jul		00:00

SW
SW

 15 / 32 mph 51 / 45°F 92% 1004 mb
Low level cloud: 70%
Mid level cloud: 67%
High level cloud: 8%
Most Significant Cloud Type: low
94%
0.1 In
06:00

WSW
WSW

 6 / 13 mph 52 / 50°F 92% 1015 mb
Low level cloud: 58%
Mid level cloud: 45%
High level cloud: 93%
Most Significant Cloud Type: low
84%
0.0 In
12:00

W
W

 17 / 36 mph 61 / 61°F 78% 1006 mb
Low level cloud: 90%
Mid level cloud: 45%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SW
SW

 3 / 6 mph 61 / 61°F 95% 1010 mb
Low level cloud: 94%
Mid level cloud: 68%
High level cloud: 17%
Most Significant Cloud Type: low
100%
0.1 In
Sun 07
Jul		00:00

WSW
WSW

 10 / 21 mph 50 / 46°F 95% 1008 mb
Low level cloud: 16%
Mid level cloud: 20%
High level cloud: 4%
Most Significant Cloud Type: low
23%
0.0 In
06:00

NNW
NNW

 1 / 1 mph 57 / 57°F 93% 1011 mb
Low level cloud: 46%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.0 In
12:00

WSW
WSW

 8 / 17 mph 67 / 67°F 58% 1008 mb
Low level cloud: 63%
Mid level cloud: 16%
High level cloud: 8%
Most Significant Cloud Type: low
69%
0.0 In
18:00

NW
NW

 3 / 6 mph 61 / 61°F 92% 1011 mb
Low level cloud: 56%
Mid level cloud: 80%
High level cloud: 33%
Most Significant Cloud Type: low
88%
0.0 In
Mon 08
Jul		00:00

SSW
SSW

 4 / 8 mph 58 / 58°F 85% 1009 mb
Low level cloud: 0%
Mid level cloud: 76%
High level cloud: 33%
Most Significant Cloud Type: medium
77%
0.0 In
06:00

NE
NE

 14 / 30 mph 53 / 49°F 97% 1014 mb
Low level cloud: 91%
Mid level cloud: 96%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.5 In
12:00

E
E

 7 / 15 mph 57 / 56°F 93% 1010 mb
Low level cloud: 92%
Mid level cloud: 82%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NNE
NNE

 14 / 29 mph 58 / 55°F 79% 1020 mb
Low level cloud: 21%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
26%
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