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Zermatt 14 Day Long Range Forecast

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

Switzerland

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

The next 14 day outlook for Zermatt shows the average daytime maximum temperature will be around 3°C, with a high for the two weeks of 8°C expected on the afternoon of Tuesday 30th. The mean minimum temperature will be -9°C, dipping to its lowest on the morning of Thursday 25th at -20°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain or sleet. Current predictions suggest Wednesday 1st will have the most precipitation with an accumulation of around 41.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 23
Apr		19:00

NNW
NNW

 9 / 10 mph 15 / 3°F 97% 1014 mb
Low level cloud: 64%
Mid level cloud: 45%
High level cloud: 34%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 9 / 19 mph 3 / -12°F 99% 1019 mb
Low level cloud: 95%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 24
Apr		01:00

NW
NW

 8 / 17 mph 0 / -15°F 98% 1020 mb
Low level cloud: 93%
Mid level cloud: 78%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 10 / 20 mph 0 / -16°F 99% 1020 mb
Low level cloud: 93%
Mid level cloud: 79%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 10 / 20 mph 6 / -9°F 97% 1016 mb
Low level cloud: 85%
Mid level cloud: 64%
High level cloud: 36%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 9 / 11 mph 25 / 15°F 79% 1011 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 93%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 8 / 9 mph 27 / 19°F 83% 1010 mb
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 12%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 9 / 10 mph 28 / 20°F 79% 1008 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 8 / 16 mph 10 / -2°F 96% 1012 mb
Low level cloud: 64%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 8 / 17 mph 5 / -9°F 99% 1017 mb
Low level cloud: 88%
Mid level cloud: 68%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 25
Apr		01:00

NW
NW

 8 / 16 mph 3 / -10°F 99% 1016 mb
Low level cloud: 91%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 4 / 9 mph -1 / -10°F 99% 1019 mb
Low level cloud: 92%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 0 / 1 mph 8 / 8°F 68% 1014 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
10:00

SSW
SSW

 3 / 4 mph 26 / 22°F 36% 1008 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 3 / 4 mph 30 / 27°F 52% 1007 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 4 / 4 mph 33 / 29°F 66% 1006 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 10%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 3 / 6 mph 17 / 12°F 96% 1009 mb
Low level cloud: 44%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 6 / 11 mph 14 / 5°F 94% 1013 mb
Low level cloud: 64%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 26
Apr		01:00

S
S

 6 / 13 mph 10 / -1°F 96% 1014 mb
Low level cloud: 46%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 7 / 14 mph 12 / 1°F 96% 1013 mb
Low level cloud: 52%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 6 / 7 mph 27 / 20°F 94% 1011 mb
Low level cloud: 38%
Mid level cloud: 46%
High level cloud: 63%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 5 / 6 mph 32 / 26°F 84% 1010 mb
Low level cloud: 10%
Mid level cloud: 27%
High level cloud: 98%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 6 / 8 mph 34 / 27°F 92% 1009 mb
Low level cloud: 29%
Mid level cloud: 61%
High level cloud: 98%
Most Significant Cloud Type: low
61%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

SSE
SSE

 6 / 7 mph 34 / 28°F 89% 1010 mb
Low level cloud: 37%
Mid level cloud: 44%
High level cloud: 14%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 5 / 6 mph 29 / 24°F 92% 1013 mb
Low level cloud: 54%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 7 / 14 mph 11 / 0°F 96% 1018 mb
Low level cloud: 57%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 27
Apr		01:00

SSE
SSE

 7 / 15 mph 13 / 2°F 96% 1017 mb
Low level cloud: 62%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 9 / 18 mph 14 / 2°F 96% 1016 mb
Low level cloud: 54%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 9 / 10 mph 29 / 20°F 95% 1015 mb
Low level cloud: 50%
Mid level cloud: 45%
High level cloud: 6%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 10 / 12 mph 34 / 26°F 90% 1013 mb
Low level cloud: 22%
Mid level cloud: 38%
High level cloud: 1%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 11 / 12 mph 36 / 28°F 93% 1012 mb
Low level cloud: 21%
Mid level cloud: 43%
High level cloud: 91%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 9 / 11 mph 36 / 29°F 91% 1012 mb
Low level cloud: 27%
Mid level cloud: 88%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 9 / 11 mph 33 / 25°F 96% 1015 mb
Low level cloud: 60%
Mid level cloud: 43%
High level cloud: 58%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 10 / 15 mph 23 / 13°F 95% 1016 mb
Low level cloud: 54%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
80%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 28
Apr		01:00

SSE
SSE

 9 / 17 mph 21 / 11°F 95% 1017 mb
Low level cloud: 50%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: low
67%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

SSE
SSE

 10 / 19 mph 22 / 11°F 95% 1016 mb
Low level cloud: 53%
Mid level cloud: 44%
High level cloud: 22%
Most Significant Cloud Type: low
71%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

SSE
SSE

 9 / 11 mph 35 / 27°F 95% 1016 mb
Low level cloud: 50%
Mid level cloud: 45%
High level cloud: 87%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 9 / 11 mph 38 / 31°F 95% 1016 mb
Low level cloud: 53%
Mid level cloud: 44%
High level cloud: 99%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 10 / 11 mph 39 / 33°F 96% 1016 mb
Low level cloud: 52%
Mid level cloud: 99%
High level cloud: 43%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 9 / 11 mph 38 / 32°F 96% 1017 mb
Low level cloud: 64%
Mid level cloud: 79%
High level cloud: 30%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 8 / 10 mph 36 / 30°F 98% 1019 mb
Low level cloud: 78%
Mid level cloud: 91%
High level cloud: 98%
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 36 / 29°F 97% 1021 mb
Low level cloud: 70%
Mid level cloud: 88%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 29
Apr		01:00

SSE
SSE

 9 / 14 mph 27 / 19°F 98% 1021 mb
Low level cloud: 82%
Mid level cloud: 58%
High level cloud: 91%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 8 / 17 mph 26 / 17°F 98% 1021 mb
Low level cloud: 80%
Mid level cloud: 55%
High level cloud: 73%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 8 / 15 mph 28 / 20°F 90% 1020 mb
Low level cloud: 16%
Mid level cloud: 29%
High level cloud: 9%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 8 / 9 mph 43 / 37°F 87% 1020 mb
Low level cloud: 2%
Mid level cloud: 21%
High level cloud: 63%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 8 / 9 mph 44 / 38°F 87% 1021 mb
Low level cloud: 8%
Mid level cloud: 26%
High level cloud: 99%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 8 / 9 mph 44 / 38°F 89% 1021 mb
Low level cloud: 17%
Mid level cloud: 30%
High level cloud: 10%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 7 / 9 mph 38 / 32°F 96% 1023 mb
Low level cloud: 60%
Mid level cloud: 43%
High level cloud: 4%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 8 / 17 mph 27 / 19°F 95% 1024 mb
Low level cloud: 50%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 30
Apr		01:00

N
N

 1 / 2 mph 16 / 16°F 98% 1016 mb
Low level cloud: 66%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
85%
0.0 In
07:00

SSE
SSE

 5 / 11 mph 28 / 23°F 95% 1022 mb
Low level cloud: 28%
Mid level cloud: 36%
High level cloud: 17%
Most Significant Cloud Type: low
42%
0.0 In
13:00

SE
SE

 5 / 10 mph 43 / 40°F 100% 1023 mb
Low level cloud: 98%
Mid level cloud: 99%
High level cloud: 10%
Most Significant Cloud Type: low
100%
0.0 In
19:00

SSE
SSE

 5 / 10 mph 41 / 37°F 93% 1023 mb
Low level cloud: 30%
Mid level cloud: 39%
High level cloud: 80%
Most Significant Cloud Type: low
53%
0.0 In
Wed 01
May		01:00

NNW
NNW

 2 / 5 mph 35 / 33°F 98% 1017 mb
Low level cloud: 78%
Mid level cloud: 78%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SSE
SSE

 3 / 6 mph 31 / 28°F 77% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
13:00

SE
SE

 8 / 16 mph 45 / 40°F 89% 1014 mb
Low level cloud: 27%
Mid level cloud: 45%
High level cloud: 3%
Most Significant Cloud Type: low
43%
0.0 In
19:00

SE
SE

 8 / 15 mph 45 / 41°F 92% 1011 mb
Low level cloud: 56%
Mid level cloud: 43%
High level cloud: 2%
Most Significant Cloud Type: low
71%
0.0 In
Thu 02
May		01:00

ESE
ESE

 8 / 16 mph 39 / 33°F 98% 1010 mb
Low level cloud: 83%
Mid level cloud: 60%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
07:00

ESE
ESE

 9 / 16 mph 37 / 31°F 97% 1006 mb
Low level cloud: 77%
Mid level cloud: 52%
High level cloud: 32%
Most Significant Cloud Type: low
99%
0.1 In
13:00

SSE
SSE

 7 / 13 mph 43 / 38°F 98% 1008 mb
Low level cloud: 72%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
19:00

ESE
ESE

 8 / 15 mph 43 / 38°F 98% 1004 mb
Low level cloud: 74%
Mid level cloud: 50%
High level cloud: 32%
Most Significant Cloud Type: low
95%
0.9 In
Fri 03
May		01:00

NW
NW

 4 / 7 mph 26 / 22°F 96% 1011 mb
Low level cloud: 46%
Mid level cloud: 46%
High level cloud: 21%
Most Significant Cloud Type: low
64%
0.1 In
07:00

SE
SE

 2 / 5 mph 39 / 38°F 94% 1002 mb
Low level cloud: 58%
Mid level cloud: 44%
High level cloud: 15%
Most Significant Cloud Type: low
74%
0.2 In
13:00

NW
NW

 5 / 11 mph 43 / 39°F 99% 1008 mb
Low level cloud: 79%
Mid level cloud: 67%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.1 In
19:00

NW
NW

 6 / 11 mph 43 / 39°F 98% 1005 mb
Low level cloud: 82%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Sat 04
May		01:00

NW
NW

 7 / 15 mph 38 / 32°F 98% 1011 mb
Low level cloud: 81%
Mid level cloud: 61%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.1 In
07:00

NNW
NNW

 5 / 10 mph 40 / 36°F 100% 1008 mb
Low level cloud: 93%
Mid level cloud: 81%
High level cloud: 50%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NW
NW

 2 / 5 mph 42 / 41°F 98% 1010 mb
Low level cloud: 71%
Mid level cloud: 58%
High level cloud: 21%
Most Significant Cloud Type: low
93%
0.1 In
19:00

N
N

 4 / 9 mph 44 / 41°F 99% 1012 mb
Low level cloud: 86%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
Sun 05
May		01:00

NW
NW

 5 / 10 mph 36 / 32°F 99% 1012 mb
Low level cloud: 89%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
07:00

NNE
NNE

 3 / 6 mph 43 / 42°F 89% 1015 mb
Low level cloud: 10%
Mid level cloud: 26%
High level cloud: 14%
Most Significant Cloud Type: low
21%
0.0 In
13:00

WNW
WNW

 5 / 10 mph 39 / 35°F 99% 1010 mb
Low level cloud: 68%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: low
84%
0.1 In
19:00

SSW
SSW

 1 / 2 mph 46 / 46°F 94% 1016 mb
Low level cloud: 43%
Mid level cloud: 50%
High level cloud: 14%
Most Significant Cloud Type: low
62%
0.2 In
Mon 06
May		01:00

WNW
WNW

 1 / 1 mph 20 / 20°F 62% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

S
S

 4 / 8 mph 44 / 43°F 89% 1017 mb
Low level cloud: 12%
Mid level cloud: 27%
High level cloud: 6%
Most Significant Cloud Type: low
22%
0.0 In
13:00

SSW
SSW

 4 / 9 mph 41 / 38°F 89% 1013 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 99%
Most Significant Cloud Type: medium
56%
0.0 In
19:00

WSW
WSW

 1 / 1 mph 47 / 47°F 98% 1017 mb
Low level cloud: 71%
Mid level cloud: 58%
High level cloud: 14%
Most Significant Cloud Type: low
92%
0.2 In
Tue 07
May		01:00

WSW
WSW

 5 / 11 mph 21 / 14°F 95% 1017 mb
Low level cloud: 43%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.0 In
07:00

SW
SW

 4 / 9 mph 43 / 41°F 88% 1017 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
56%
0.1 In
13:00

WNW
WNW

 5 / 10 mph 40 / 36°F 97% 1013 mb
Low level cloud: 51%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.1 In
19:00

W
W

 5 / 10 mph 48 / 46°F 94% 1014 mb
Low level cloud: 65%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: low
97%
0.2 In
Wed 08
May		01:00

WNW
WNW

 4 / 8 mph 21 / 16°F 96% 1017 mb
Low level cloud: 53%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
80%
0.0 In
07:00

NW
NW

 5 / 10 mph 37 / 33°F 83% 1013 mb
Low level cloud: 15%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.0 In
13:00

SSE
SSE

 8 / 16 mph 41 / 36°F 92% 1006 mb
Low level cloud: 32%
Mid level cloud: 43%
High level cloud: 13%
Most Significant Cloud Type: low
49%
0.0 In
19:00

NW
NW

 6 / 13 mph 42 / 38°F 86% 1014 mb
Low level cloud: 25%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.1 In

Other Locations Near to Zermatt

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