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Bonn 14 Day Long Range Forecast

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

Germany

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

Taking a look at Bonn over the coming two weeks and the average daytime maximum temperature will be around 8°C, with a high for the two weeks of 11°C expected on the afternoon of Thursday 18th. The mean minimum temperature will be 3°C, dipping to its lowest on the morning of Monday 22nd at 2°C. Expect the coming 14 days to have mixed weather with some days dry and some seeing a little rain. Current predictions suggest Friday 19th will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 14
Dec		19:00

SSE
SSE

 6 / 7 mph 44 / 41°F 92% 1023 mb
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 5 / 8 mph 42 / 38°F 93% 1022 mb
Low level cloud: 18%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 15
Dec		01:00

SE
SE

 5 / 11 mph 37 / 33°F 93% 1021 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
04:00

SE
SE

 6 / 13 mph 36 / 31°F 91% 1019 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
07:00

SE
SE

 7 / 14 mph 36 / 30°F 87% 1018 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 6 / 11 mph 39 / 34°F 82% 1018 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
13:00

SE
SE

 7 / 9 mph 48 / 45°F 69% 1017 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 32%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 7 / 12 mph 46 / 42°F 78% 1016 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 32%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 6 / 13 mph 40 / 36°F 89% 1016 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 6 / 13 mph 39 / 35°F 90% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 10%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 16
Dec		01:00

SE
SE

 5 / 11 mph 39 / 35°F 87% 1016 mb
Low level cloud: 0%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 6 / 12 mph 40 / 36°F 77% 1015 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 32%
Most Significant Cloud Type: medium
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 6 / 12 mph 38 / 33°F 75% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 6 / 12 mph 40 / 36°F 70% 1016 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

 5 / 7 mph 49 / 47°F 59% 1016 mb
Low level cloud: 0%
Mid level cloud: 89%
High level cloud: 20%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 5 / 11 mph 44 / 41°F 65% 1016 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 4 / 9 mph 41 / 38°F 68% 1017 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 4 / 9 mph 40 / 37°F 70% 1018 mb
Low level cloud: 0%
Mid level cloud: 33%
High level cloud: 100%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 17
Dec		01:00

SSE
SSE

 3 / 7 mph 38 / 36°F 73% 1018 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 3 / 6 mph 38 / 36°F 77% 1019 mb
Low level cloud: 2%
Mid level cloud: 29%
High level cloud: 1%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 3 / 6 mph 40 / 39°F 78% 1020 mb
Low level cloud: 0%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 3 / 6 mph 43 / 42°F 78% 1022 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 2 / 3 mph 48 / 48°F 75% 1022 mb
Low level cloud: 20%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 3 / 6 mph 47 / 46°F 81% 1022 mb
Low level cloud: 69%
Mid level cloud: 86%
High level cloud: 1%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 3 / 6 mph 45 / 44°F 89% 1023 mb
Low level cloud: 49%
Mid level cloud: 68%
High level cloud: 13%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 4 / 10 mph 43 / 41°F 94% 1023 mb
Low level cloud: 72%
Mid level cloud: 25%
High level cloud: 5%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 18
Dec		01:00

SSE
SSE

 4 / 9 mph 44 / 42°F 92% 1024 mb
Low level cloud: 85%
Mid level cloud: 25%
High level cloud: 6%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 5 / 9 mph 45 / 43°F 89% 1023 mb
Low level cloud: 70%
Mid level cloud: 46%
High level cloud: 18%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 6 / 10 mph 46 / 43°F 88% 1023 mb
Low level cloud: 62%
Mid level cloud: 30%
High level cloud: 11%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 6 / 10 mph 46 / 42°F 88% 1022 mb
Low level cloud: 41%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 7 / 8 mph 52 / 50°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 7 / 11 mph 49 / 45°F 78% 1018 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
19:00

SE
SE

 7 / 13 mph 44 / 40°F 86% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 7 / 13 mph 42 / 38°F 86% 1017 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
Fri 19
Dec		01:00

SSE
SSE

 8 / 16 mph 42 / 37°F 85% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 8 / 17 mph 41 / 36°F 87% 1016 mb
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 8 / 17 mph 40 / 35°F 87% 1016 mb
Low level cloud: 74%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 9 / 17 mph 44 / 39°F 82% 1017 mb
Low level cloud: 92%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 6 / 10 mph 47 / 44°F 84% 1017 mb
Low level cloud: 93%
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
16:00

SSE
SSE

 3 / 4 mph 48 / 47°F 92% 1018 mb
Low level cloud: 98%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 4 / 7 mph 46 / 44°F 95% 1020 mb
Low level cloud: 93%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

WNW
WNW

 4 / 6 mph 44 / 42°F 88% 1021 mb
Low level cloud: 22%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 20
Dec		01:00

WNW
WNW

 3 / 6 mph 40 / 38°F 89% 1022 mb
Low level cloud: 11%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 2 / 4 mph 38 / 38°F 89% 1022 mb
Low level cloud: 6%
Mid level cloud: 88%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 0 / 0 mph 38 / 38°F 90% 1021 mb
Low level cloud: 7%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 1 / 1 mph 41 / 41°F 87% 1021 mb
Low level cloud: 3%
Mid level cloud: 22%
High level cloud: 55%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 1 / 1 mph 44 / 44°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 80%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 2 / 2 mph 45 / 45°F 83% 1018 mb
Low level cloud: 1%
Mid level cloud: 73%
High level cloud: 38%
Most Significant Cloud Type: medium
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 2 / 3 mph 43 / 43°F 87% 1017 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 2 / 3 mph 41 / 40°F 94% 1015 mb
Low level cloud: 97%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 21
Dec		01:00

S
S

 5 / 6 mph 45 / 43°F 89% 1029 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: medium
14%
0.0 In
07:00

NW
NW

 4 / 4 mph 46 / 45°F 98% 1027 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SSE
SSE

 2 / 3 mph 50 / 50°F 69% 1021 mb
Low level cloud: 34%
Mid level cloud: 7%
High level cloud: 10%
Most Significant Cloud Type: low
37%
0.0 In
19:00

NW
NW

 4 / 4 mph 53 / 53°F 90% 1019 mb
Low level cloud: 6%
Mid level cloud: 7%
High level cloud: 14%
Most Significant Cloud Type: low
10%
0.0 In
Mon 22
Dec		01:00

SSW
SSW

 4 / 5 mph 40 / 38°F 79% 1022 mb
Low level cloud: 93%
Mid level cloud: 15%
High level cloud: 61%
Most Significant Cloud Type: low
100%
0.0 In
07:00

W
W

 2 / 2 mph 42 / 41°F 93% 1025 mb
Low level cloud: 97%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
13:00

SE
SE

 6 / 7 mph 48 / 45°F 68% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
19:00

W
W

 1 / 2 mph 47 / 47°F 93% 1014 mb
Low level cloud: 94%
Mid level cloud: 69%
High level cloud: 27%
Most Significant Cloud Type: low
100%
0.0 In
Tue 23
Dec		01:00

ENE
ENE

 2 / 3 mph 41 / 41°F 93% 1012 mb
Low level cloud: 76%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
89%
0.0 In
07:00

SSW
SSW

 5 / 7 mph 43 / 40°F 76% 1016 mb
Low level cloud: 47%
Mid level cloud: 37%
High level cloud: 4%
Most Significant Cloud Type: low
60%
0.0 In
13:00

ESE
ESE

 0 / 0 mph 44 / 44°F 86% 1011 mb
Low level cloud: 92%
Mid level cloud: 27%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.0 In
19:00

SSW
SSW

 9 / 10 mph 45 / 41°F 75% 1014 mb
Low level cloud: 1%
Mid level cloud: 99%
High level cloud: 97%
Most Significant Cloud Type: medium
100%
0.0 In
Wed 24
Dec		01:00

N
N

 2 / 2 mph 42 / 42°F 91% 1014 mb
Low level cloud: 96%
Mid level cloud: 69%
High level cloud: 34%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WNW
WNW

 6 / 7 mph 43 / 40°F 92% 1017 mb
Low level cloud: 97%
Mid level cloud: 100%
High level cloud: 72%
Most Significant Cloud Type: low
100%
0.2 In
13:00

N
N

 4 / 6 mph 43 / 41°F 95% 1020 mb
Low level cloud: 100%
Mid level cloud: 48%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NW
NW

 4 / 6 mph 47 / 46°F 79% 1027 mb
Low level cloud: 90%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.0 In
Thu 25
Dec		01:00

N
N

 4 / 6 mph 40 / 37°F 89% 1028 mb
Low level cloud: 9%
Mid level cloud: 17%
High level cloud: 14%
Most Significant Cloud Type: low
16%
0.0 In
07:00

W
W

 2 / 3 mph 40 / 39°F 84% 1033 mb
Low level cloud: 67%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
13:00

NNE
NNE

 7 / 9 mph 41 / 36°F 62% 1028 mb
Low level cloud: 48%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
19:00

SSW
SSW

 3 / 4 mph 45 / 44°F 83% 1035 mb
Low level cloud: 4%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
55%
0.0 In
Fri 26
Dec		01:00

NE
NE

 4 / 5 mph 34 / 31°F 85% 1028 mb
Low level cloud: 41%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: low
53%
0.0 In
07:00

S
S

 4 / 9 mph 37 / 33°F 79% 1036 mb
Low level cloud: 82%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
86%
0.0 In
13:00

ENE
ENE

 5 / 7 mph 42 / 38°F 79% 1028 mb
Low level cloud: 94%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
19:00

SSW
SSW

 4 / 7 mph 43 / 41°F 85% 1035 mb
Low level cloud: 96%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Sat 27
Dec		01:00

N
N

 3 / 4 mph 37 / 35°F 89% 1028 mb
Low level cloud: 71%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
71%
0.0 In
07:00

W
W

 9 / 19 mph 42 / 37°F 90% 1032 mb
Low level cloud: 100%
Mid level cloud: 78%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.0 In
13:00

WNW
WNW

 6 / 7 mph 40 / 36°F 84% 1027 mb
Low level cloud: 91%
Mid level cloud: 0%
High level cloud: 51%
Most Significant Cloud Type: low
97%
0.0 In
19:00

WNW
WNW

 7 / 10 mph 49 / 45°F 85% 1038 mb
Low level cloud: 40%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
Sun 28
Dec		01:00

NW
NW

 6 / 8 mph 34 / 28°F 83% 1026 mb
Low level cloud: 19%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
07:00

W
W

 4 / 6 mph 41 / 38°F 90% 1038 mb
Low level cloud: 98%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNW
NNW

 9 / 11 mph 37 / 30°F 57% 1025 mb
Low level cloud: 31%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.0 In
19:00

WSW
WSW

 11 / 15 mph 44 / 38°F 68% 1029 mb
Low level cloud: 98%
Mid level cloud: 93%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.0 In
Mon 29
Dec		01:00

NW
NW

 4 / 5 mph 36 / 33°F 83% 1023 mb
Low level cloud: 14%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In
07:00

W
W

 15 / 26 mph 46 / 39°F 93% 1021 mb
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.1 In
13:00

SW
SW

 2 / 3 mph 40 / 40°F 58% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 96%
Most Significant Cloud Type: medium
7%
0.0 In
19:00

WNW
WNW

 12 / 17 mph 48 / 43°F 97% 1021 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In

Other Locations Near to Bonn

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