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Aachen 14 Day Long Range Forecast

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

Germany

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

For Aachen in the coming two weeks 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 12th. The mean minimum temperature will be 3°C, dipping to its lowest on the morning of Tuesday 10th at -1°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain or snow. The indicators are that Sunday 15th will have the most precipitation with an accumulation of around 17.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 05
Feb
16:00

SE
SE

11 / 13 mph 43 / 37°F 87% 989 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

6 / 11 mph 37 / 32°F 91% 989 mb
Low level cloud: 65%
Mid level cloud: 44%
High level cloud: 25%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

6 / 12 mph 34 / 28°F 92% 988 mb
Low level cloud: 28%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 06
Feb
01:00

ESE
ESE

4 / 8 mph 32 / 29°F 89% 988 mb
Low level cloud: 5%
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
04:00

SSE
SSE

5 / 10 mph 34 / 30°F 86% 989 mb
Low level cloud: 37%
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
07:00

ESE
ESE

5 / 9 mph 34 / 30°F 87% 990 mb
Low level cloud: 48%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

6 / 7 mph 39 / 34°F 85% 991 mb
Low level cloud: 92%
Mid level cloud: 66%
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

SSE
SSE

5 / 7 mph 38 / 34°F 96% 992 mb
Low level cloud: 99%
Mid level cloud: 83%
High level cloud: 10%
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 / 6 mph 39 / 37°F 99% 994 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SW
SW

6 / 11 mph 39 / 35°F 97% 996 mb
Low level cloud: 87%
Mid level cloud: 86%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

6 / 9 mph 42 / 38°F 98% 998 mb
Low level cloud: 99%
Mid level cloud: 64%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 07
Feb
01:00

SSW
SSW

4 / 7 mph 42 / 39°F 99% 1000 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

7 / 9 mph 43 / 39°F 93% 1001 mb
Low level cloud: 85%
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
07:00

SSW
SSW

5 / 9 mph 40 / 36°F 87% 1002 mb
Low level cloud: 31%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

7 / 8 mph 45 / 40°F 92% 1004 mb
Low level cloud: 92%
Mid level cloud: 7%
High level cloud: 49%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

7 / 9 mph 47 / 43°F 85% 1005 mb
Low level cloud: 100%
Mid level cloud: 20%
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

S
S

6 / 7 mph 48 / 45°F 80% 1005 mb
Low level cloud: 51%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

5 / 11 mph 38 / 34°F 92% 1007 mb
Low level cloud: 90%
Mid level cloud: 20%
High level cloud: 5%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

5 / 8 mph 41 / 38°F 93% 1008 mb
Low level cloud: 25%
Mid level cloud: 57%
High level cloud: 32%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 08
Feb
01:00

SSE
SSE

4 / 8 mph 41 / 38°F 93% 1008 mb
Low level cloud: 20%
Mid level cloud: 57%
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

S
S

3 / 6 mph 40 / 38°F 90% 1009 mb
Low level cloud: 7%
Mid level cloud: 45%
High level cloud: 28%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

1 / 2 mph 40 / 40°F 89% 1009 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 19%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

1 / 2 mph 44 / 44°F 85% 1010 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: medium
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

3 / 3 mph 49 / 49°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 11%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

2 / 3 mph 49 / 49°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 19%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

4 / 9 mph 40 / 37°F 88% 1011 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 14%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

4 / 8 mph 40 / 36°F 91% 1011 mb
Low level cloud: 11%
Mid level cloud: 20%
High level cloud: 11%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 09
Feb
01:00

E
E

4 / 8 mph 35 / 31°F 94% 1011 mb
Low level cloud: 24%
Mid level cloud: 28%
High level cloud: 9%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

3 / 7 mph 33 / 30°F 96% 1011 mb
Low level cloud: 46%
Mid level cloud: 46%
High level cloud: 16%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

E
E

3 / 6 mph 32 / 30°F 94% 1011 mb
Low level cloud: 28%
Mid level cloud: 64%
High level cloud: 13%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

4 / 5 mph 41 / 39°F 85% 1011 mb
Low level cloud: 8%
Mid level cloud: 44%
High level cloud: 14%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

7 / 8 mph 46 / 42°F 73% 1010 mb
Low level cloud: 35%
Mid level cloud: 30%
High level cloud: 14%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

6 / 7 mph 46 / 43°F 73% 1008 mb
Low level cloud: 25%
Mid level cloud: 17%
High level cloud: 7%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

5 / 10 mph 34 / 30°F 88% 1009 mb
Low level cloud: 53%
Mid level cloud: 12%
High level cloud: 3%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

4 / 9 mph 33 / 29°F 89% 1009 mb
Low level cloud: 3%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 10
Feb
01:00

SE
SE

4 / 8 mph 31 / 28°F 89% 1008 mb
Low level cloud: 1%
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
04:00

ESE
ESE

4 / 8 mph 30 / 27°F 90% 1007 mb
Low level cloud: 5%
Mid level cloud: 17%
High level cloud: 67%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

4 / 9 mph 30 / 25°F 91% 1006 mb
Low level cloud: 12%
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
10:00

SE
SE

7 / 8 mph 39 / 34°F 83% 1005 mb
Low level cloud: 13%
Mid level cloud: 31%
High level cloud: 12%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

12 / 14 mph 45 / 39°F 74% 1001 mb
Low level cloud: 25%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

11 / 13 mph 46 / 40°F 76% 998 mb
Low level cloud: 74%
Mid level cloud: 88%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

10 / 12 mph 41 / 35°F 92% 996 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
22:00

SSE
SSE

9 / 11 mph 41 / 35°F 98% 993 mb
Low level cloud: 100%
Mid level cloud: 88%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 11
Feb
01:00

S
S

10 / 13 mph 42 / 37°F 98% 990 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
04:00

WSW
WSW

12 / 18 mph 45 / 39°F 98% 989 mb
Low level cloud: 99%
Mid level cloud: 81%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

20 / 26 mph 48 / 41°F 95% 990 mb
Low level cloud: 93%
Mid level cloud: 27%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

WSW
WSW

19 / 23 mph 47 / 39°F 88% 992 mb
Low level cloud: 88%
Mid level cloud: 15%
High level cloud: 21%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

16 / 18 mph 51 / 45°F 79% 993 mb
Low level cloud: 66%
Mid level cloud: 44%
High level cloud: 52%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

17 / 20 mph 44 / 37°F 90% 994 mb
Low level cloud: 86%
Mid level cloud: 97%
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

W
W

16 / 19 mph 44 / 37°F 80% 996 mb
Low level cloud: 100%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

15 / 17 mph 43 / 36°F 89% 998 mb
Low level cloud: 96%
Mid level cloud: 47%
High level cloud: 1%
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
Thu 12
Feb
01:00

SW
SW

17 / 30 mph 44 / 37°F 93% 988 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 39%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WSW
WSW

18 / 27 mph 40 / 31°F 97% 997 mb
Low level cloud: 100%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNE
NNE

18 / 22 mph 33 / 22°F 70% 1001 mb
Low level cloud: 6%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

SW
SW

9 / 12 mph 43 / 38°F 97% 996 mb
Low level cloud: 99%
Mid level cloud: 57%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Fri 13
Feb
01:00

NW
NW

2 / 4 mph 42 / 42°F 93% 1000 mb
Low level cloud: 94%
Mid level cloud: 44%
High level cloud: 82%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WSW
WSW

4 / 6 mph 42 / 39°F 97% 994 mb
Low level cloud: 86%
Mid level cloud: 68%
High level cloud: 87%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SSW
SSW

18 / 23 mph 48 / 41°F 84% 999 mb
Low level cloud: 53%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: low
83%
0.0 In
19:00

W
W

14 / 26 mph 37 / 28°F 88% 999 mb
Low level cloud: 65%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.0 In
Sat 14
Feb
01:00

NW
NW

9 / 18 mph 42 / 36°F 96% 985 mb
Low level cloud: 93%
Mid level cloud: 100%
High level cloud: 96%
Most Significant Cloud Type: low
100%
0.0 In
07:00

W
W

13 / 23 mph 32 / 23°F 95% 998 mb
Low level cloud: 89%
Mid level cloud: 56%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SW
SW

10 / 19 mph 44 / 39°F 96% 989 mb
Low level cloud: 98%
Mid level cloud: 68%
High level cloud: 65%
Most Significant Cloud Type: low
100%
0.2 In
19:00

WNW
WNW

14 / 27 mph 36 / 27°F 89% 1006 mb
Low level cloud: 68%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.1 In
Sun 15
Feb
01:00

ENE
ENE

7 / 15 mph 34 / 27°F 97% 991 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
07:00

NW
NW

5 / 10 mph 26 / 20°F 95% 1013 mb
Low level cloud: 89%
Mid level cloud: 5%
High level cloud: 12%
Most Significant Cloud Type: low
92%
0.0 In
13:00

N
N

17 / 34 mph 38 / 28°F 96% 995 mb
Low level cloud: 73%
Mid level cloud: 100%
High level cloud: 76%
Most Significant Cloud Type: low
100%
0.7 In
19:00

NE
NE

6 / 11 mph 31 / 25°F 82% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Mon 16
Feb
01:00

WNW
WNW

5 / 11 mph 14 / 6°F 93% 1010 mb
Low level cloud: 53%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: low
53%
0.0 In
07:00

NE
NE

4 / 7 mph 24 / 19°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
13:00

SSW
SSW

15 / 31 mph 34 / 24°F 99% 1005 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
19:00

NE
NE

6 / 12 mph 25 / 18°F 83% 1014 mb
Low level cloud: 5%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
0.0 In
Tue 17
Feb
01:00

SE
SE

5 / 10 mph 20 / 13°F 100% 1003 mb
Low level cloud: 100%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
07:00

NE
NE

14 / 27 mph 23 / 11°F 80% 1009 mb
Low level cloud: 19%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
13:00

SW
SW

14 / 28 mph 34 / 25°F 100% 990 mb
Low level cloud: 100%
Mid level cloud: 41%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.6 In
19:00

NNE
NNE

15 / 29 mph 28 / 17°F 69% 1009 mb
Low level cloud: 10%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
71%
0.0 In
Wed 18
Feb
01:00

W
W

17 / 35 mph 34 / 23°F 98% 990 mb
Low level cloud: 100%
Mid level cloud: 91%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.2 In
07:00

NNE
NNE

14 / 27 mph 21 / 8°F 78% 1016 mb
Low level cloud: 46%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.0 In
13:00

NNW
NNW

17 / 35 mph 34 / 24°F 90% 1010 mb
Low level cloud: 60%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NE
NE

6 / 13 mph 26 / 18°F 68% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 19
Feb
01:00

N
N

4 / 9 mph 17 / 10°F 99% 1029 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
39%
0.0 In
07:00

E
E

5 / 10 mph 19 / 11°F 88% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

SSE
SSE

9 / 19 mph 36 / 29°F 79% 1031 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 4%
Most Significant Cloud Type: medium
31%
0.0 In
19:00

ESE
ESE

7 / 16 mph 24 / 15°F 59% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Fri 20
Feb
01:00

SSE
SSE

5 / 11 mph 25 / 18°F 91% 1030 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 15%
Most Significant Cloud Type: medium
19%
0.0 In
07:00

SSE
SSE

5 / 10 mph 23 / 16°F 69% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
0.0 In
13:00

S
S

6 / 12 mph 35 / 30°F 93% 1028 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
19:00

S
S

4 / 9 mph 31 / 26°F 69% 1031 mb
Low level cloud: 6%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In

Other Locations Near to Aachen

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