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Winterthur 14 Day Long Range Forecast

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

Switzerland

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

Taking a look at Winterthur over the coming two weeks and the average daytime maximum temperature will be around 21°C, with a high for the two weeks of 23°C expected on the afternoon of Saturday 17th. The average minimum temperature will be 5°C, dipping to its lowest on the morning of Friday 9th at 2°C. The fortnight ahead will have mixed overhead conditions with some days dry and some seeing a significant amount of rain. Predictions are Monday 12th will have the most precipitation with an accumulation of around 2.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 09
May		19:00

NE
NE

 8 / 11 mph 56 / 52°F 62% 1016 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 4%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 5 / 11 mph 45 / 42°F 77% 1019 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 1%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 10
May		01:00

ENE
ENE

 2 / 5 mph 39 / 38°F 94% 1020 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 1 / 3 mph 36 / 36°F 95% 1020 mb
Low level cloud: 9%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 2 / 2 mph 45 / 44°F 78% 1021 mb
Low level cloud: 4%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 4 / 4 mph 60 / 58°F 55% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 5 / 5 mph 69 / 67°F 43% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

 5 / 6 mph 71 / 68°F 41% 1015 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 8 / 13 mph 60 / 58°F 70% 1016 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 2%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 4 / 8 mph 47 / 46°F 94% 1017 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 11
May		01:00

NE
NE

 1 / 2 mph 43 / 43°F 95% 1017 mb
Low level cloud: 10%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 2 / 4 mph 40 / 40°F 96% 1017 mb
Low level cloud: 17%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 2 / 2 mph 49 / 48°F 83% 1017 mb
Low level cloud: 11%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 5 / 6 mph 63 / 61°F 57% 1014 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 9%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 6 / 7 mph 72 / 69°F 45% 1012 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 7%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 9 / 11 mph 72 / 75°F 42% 1009 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 2%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 9 / 13 mph 62 / 60°F 66% 1010 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 4 / 8 mph 49 / 48°F 92% 1011 mb
Low level cloud: 5%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 12
May		01:00

NE
NE

 1 / 1 mph 45 / 45°F 95% 1012 mb
Low level cloud: 18%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 2 / 4 mph 43 / 43°F 97% 1013 mb
Low level cloud: 45%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 2 / 2 mph 51 / 50°F 87% 1013 mb
Low level cloud: 52%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

 2 / 2 mph 57 / 58°F 68% 1012 mb
Low level cloud: 11%
Mid level cloud: 67%
High level cloud: 0%
Most Significant Cloud Type: medium
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

 3 / 3 mph 70 / 67°F 50% 1010 mb
Low level cloud: 8%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 8 / 10 mph 65 / 63°F 65% 1010 mb
Low level cloud: 2%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 6 / 10 mph 55 / 53°F 84% 1012 mb
Low level cloud: 4%
Mid level cloud: 96%
High level cloud: 4%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 7 / 10 mph 49 / 46°F 94% 1015 mb
Low level cloud: 76%
Mid level cloud: 16%
High level cloud: 31%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 13
May		01:00

SW
SW

 2 / 3 mph 48 / 49°F 92% 1015 mb
Low level cloud: 99%
Mid level cloud: 10%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 0 / 0 mph 48 / 47°F 93% 1016 mb
Low level cloud: 68%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 3 / 4 mph 52 / 50°F 87% 1017 mb
Low level cloud: 15%
Mid level cloud: 3%
High level cloud: 4%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 6 / 7 mph 62 / 60°F 49% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 1%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 8 / 9 mph 67 / 65°F 35% 1015 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 3%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 8 / 9 mph 67 / 65°F 38% 1014 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 8%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 8 / 12 mph 59 / 56°F 60% 1016 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 6%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 3 / 7 mph 45 / 44°F 84% 1018 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 8%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 14
May		01:00

ENE
ENE

 2 / 5 mph 42 / 41°F 93% 1019 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 7%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 2 / 5 mph 39 / 38°F 95% 1020 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 3 / 3 mph 48 / 47°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 7 / 9 mph 62 / 60°F 47% 1018 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 8 / 9 mph 70 / 68°F 35% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 2%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 10 / 11 mph 70 / 68°F 37% 1016 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 8%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 7 / 12 mph 60 / 58°F 60% 1017 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 3 / 7 mph 47 / 46°F 90% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 12%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 15
May		01:00

ENE
ENE

 2 / 5 mph 42 / 42°F 95% 1020 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 22%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

E
E

 2 / 4 mph 40 / 40°F 95% 1021 mb
Low level cloud: 4%
Mid level cloud: 2%
High level cloud: 91%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 2 / 3 mph 50 / 50°F 76% 1022 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
10:00

ENE
ENE

 8 / 9 mph 65 / 63°F 48% 1020 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
13:00

NE
NE

 11 / 12 mph 72 / 74°F 35% 1019 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
16:00

NE
NE

 10 / 12 mph 72 / 75°F 38% 1019 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 6 / 10 mph 64 / 62°F 63% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 3 / 6 mph 49 / 49°F 89% 1023 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 27%
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 16
May		01:00

E
E

 3 / 5 mph 44 / 43°F 93% 1026 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
07:00

NNE
NNE

 1 / 1 mph 56 / 56°F 91% 1011 mb
Low level cloud: 34%
Mid level cloud: 43%
High level cloud: 87%
Most Significant Cloud Type: low
59%
0.0 In
13:00

NE
NE

 9 / 11 mph 71 / 71°F 38% 1020 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
19:00

NE
NE

 9 / 18 mph 56 / 53°F 85% 1021 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.0 In
Sat 17
May		01:00

ENE
ENE

 2 / 4 mph 53 / 53°F 93% 1025 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: medium
9%
0.0 In
07:00

NNE
NNE

 3 / 3 mph 53 / 54°F 64% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
0.0 In
13:00

NE
NE

 12 / 14 mph 65 / 65°F 36% 1017 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
19:00

NE
NE

 11 / 13 mph 62 / 62°F 56% 1022 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 17%
Most Significant Cloud Type: medium
8%
0.0 In
Sun 18
May		01:00

NE
NE

 3 / 5 mph 50 / 49°F 94% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

NE
NE

 4 / 5 mph 51 / 50°F 76% 1025 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NE
NE

 15 / 19 mph 69 / 69°F 36% 1020 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 19%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

NE
NE

 9 / 15 mph 57 / 55°F 56% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Mon 19
May		01:00

ENE
ENE

 9 / 15 mph 51 / 48°F 65% 1021 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

NE
NE

 3 / 4 mph 52 / 51°F 73% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
0.0 In
13:00

NE
NE

 10 / 13 mph 70 / 71°F 40% 1018 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
19:00

NE
NE

 7 / 10 mph 62 / 62°F 61% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Tue 20
May		01:00

E
E

 1 / 2 mph 50 / 50°F 89% 1020 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
07:00

SW
SW

 1 / 1 mph 57 / 57°F 79% 1021 mb
Low level cloud: 2%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: medium
16%
0.0 In
13:00

NE
NE

 5 / 7 mph 74 / 76°F 39% 1015 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 11%
Most Significant Cloud Type: medium
99%
0.0 In
19:00

SE
SE

 4 / 4 mph 62 / 62°F 77% 1016 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 10%
Most Significant Cloud Type: medium
18%
0.0 In
Wed 21
May		01:00

S
S

 2 / 2 mph 56 / 56°F 97% 1015 mb
Low level cloud: 37%
Mid level cloud: 24%
High level cloud: 11%
Most Significant Cloud Type: low
46%
0.0 In
07:00

NE
NE

 2 / 2 mph 54 / 55°F 83% 1017 mb
Low level cloud: 12%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: medium
90%
0.0 In
13:00

NE
NE

 5 / 7 mph 77 / 78°F 40% 1009 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: medium
17%
0.0 In
19:00

E
E

 3 / 5 mph 58 / 58°F 77% 1014 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.1 In
Thu 22
May		01:00

E
E

 2 / 4 mph 56 / 57°F 96% 1010 mb
Low level cloud: 37%
Mid level cloud: 93%
High level cloud: 86%
Most Significant Cloud Type: low
79%
0.2 In
07:00

NE
NE

 1 / 2 mph 52 / 52°F 93% 1014 mb
Low level cloud: 37%
Mid level cloud: 13%
High level cloud: 12%
Most Significant Cloud Type: low
43%
0.1 In
13:00

N
N

 1 / 2 mph 67 / 67°F 75% 1011 mb
Low level cloud: 64%
Mid level cloud: 36%
High level cloud: 21%
Most Significant Cloud Type: low
78%
0.1 In
19:00

ENE
ENE

 5 / 9 mph 64 / 64°F 66% 1010 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
Fri 23
May		01:00

SSE
SSE

 2 / 4 mph 57 / 58°F 96% 1010 mb
Low level cloud: 37%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: low
77%
0.2 In
07:00

NW
NW

 1 / 1 mph 53 / 53°F 86% 1012 mb
Low level cloud: 59%
Mid level cloud: 10%
High level cloud: 19%
Most Significant Cloud Type: low
64%
0.0 In
13:00

NW
NW

 4 / 9 mph 70 / 70°F 70% 1009 mb
Low level cloud: 27%
Mid level cloud: 28%
High level cloud: 9%
Most Significant Cloud Type: low
37%
0.1 In
19:00

SW
SW

 6 / 12 mph 55 / 53°F 95% 1011 mb
Low level cloud: 59%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: low
88%
0.2 In
Sat 24
May		01:00

SSE
SSE

 3 / 7 mph 51 / 50°F 96% 1012 mb
Low level cloud: 33%
Mid level cloud: 31%
High level cloud: 32%
Most Significant Cloud Type: low
47%
0.3 In
07:00

NE
NE

 0 / 1 mph 53 / 53°F 94% 1012 mb
Low level cloud: 84%
Mid level cloud: 27%
High level cloud: 21%
Most Significant Cloud Type: low
95%
0.0 In
13:00

ENE
ENE

 8 / 17 mph 74 / 76°F 44% 1008 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 12%
Most Significant Cloud Type: medium
27%
0.0 In
19:00

E
E

 3 / 6 mph 62 / 62°F 72% 1007 mb
Low level cloud: 0%
Mid level cloud: 61%
High level cloud: 4%
Most Significant Cloud Type: medium
61%
0.0 In

Other Locations Near to Winterthur

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