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Evry 14 Day Long Range Forecast

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

France

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

Over the next 14 days the Evry forecast suggests the average daytime maximum temperature will be around 32°C, with a high for the two weeks of 40°C expected on the afternoon of Tuesday 1st. The average minimum temperature will be 18°C, dipping to its lowest on the morning of Monday 7th at 13°C. Expect the coming 14 days to have mostly dry days although Sunday is likely to see a little rain. Predictions are Sunday 6th will have the most precipitation with an accumulation of around 1.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 01
Jul		19:00

W
W

 8 / 9 mph 104 / 102°F 17% 1012 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 3%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 9 / 11 mph 91 / 92°F 37% 1013 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 02
Jul		01:00

NNE
NNE

 6 / 7 mph 83 / 85°F 52% 1014 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 5 / 8 mph 75 / 78°F 56% 1013 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 2%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 7 / 8 mph 80 / 78°F 50% 1014 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 4 / 4 mph 90 / 87°F 33% 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
13:00

NW
NW

 10 / 11 mph 97 / 95°F 25% 1014 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
16:00

NW
NW

 18 / 21 mph 90 / 90°F 38% 1015 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 5%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 15 / 17 mph 81 / 80°F 47% 1017 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 8 / 11 mph 70 / 70°F 60% 1021 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 12%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 03
Jul		01:00

NNW
NNW

 8 / 10 mph 67 / 67°F 71% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 19%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 7 / 9 mph 64 / 64°F 81% 1024 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

NNE
NNE

 10 / 12 mph 66 / 65°F 67% 1025 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

NNE
NNE

 9 / 10 mph 76 / 75°F 34% 1026 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

N
N

 8 / 10 mph 83 / 78°F 21% 1025 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
16:00

N
N

 8 / 9 mph 86 / 80°F 15% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 9 / 11 mph 86 / 79°F 16% 1024 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 63%
Most Significant Cloud Type: high
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 12 / 18 mph 71 / 71°F 32% 1025 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 32%
Most Significant Cloud Type: high
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 04
Jul		01:00

NNE
NNE

 8 / 9 mph 69 / 69°F 43% 1026 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
04:00

NNE
NNE

 7 / 8 mph 62 / 62°F 49% 1026 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
07:00

NNE
NNE

 7 / 9 mph 65 / 64°F 37% 1027 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 7 / 8 mph 78 / 75°F 22% 1027 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 7 / 8 mph 86 / 80°F 16% 1025 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
16:00

NNW
NNW

 6 / 8 mph 88 / 82°F 13% 1024 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
19:00

N
N

 6 / 7 mph 88 / 82°F 15% 1023 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
22:00

N
N

 9 / 15 mph 73 / 74°F 27% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 05
Jul		01:00

N
N

 7 / 11 mph 67 / 67°F 40% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: high
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 5 / 8 mph 63 / 63°F 47% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 4 / 5 mph 68 / 65°F 40% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 1 / 1 mph 83 / 78°F 23% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 5 / 6 mph 92 / 86°F 14% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 9 / 10 mph 96 / 91°F 11% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 11 / 13 mph 95 / 91°F 12% 1011 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 10 / 11 mph 78 / 77°F 29% 1012 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
Sun 06
Jul		01:00

N
N

 4 / 5 mph 70 / 70°F 41% 1012 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 2%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 6 / 9 mph 65 / 65°F 48% 1012 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 10%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 7 / 9 mph 66 / 64°F 80% 1012 mb
Low level cloud: 53%
Mid level cloud: 6%
High level cloud: 66%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 11 / 13 mph 66 / 65°F 79% 1012 mb
Low level cloud: 99%
Mid level cloud: 97%
High level cloud: 83%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 11 / 13 mph 74 / 76°F 49% 1012 mb
Low level cloud: 4%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 16 / 18 mph 81 / 78°F 28% 1011 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 15%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 15 / 17 mph 76 / 76°F 39% 1012 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
22:00

NW
NW

 10 / 12 mph 67 / 67°F 58% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 07
Jul		01:00

WNW
WNW

 9 / 10 mph 62 / 62°F 73% 1016 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

 7 / 9 mph 58 / 57°F 84% 1016 mb
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 7 / 8 mph 61 / 59°F 73% 1018 mb
Low level cloud: 16%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 7 / 8 mph 73 / 69°F 45% 1017 mb
Low level cloud: 42%
Mid level cloud: 0%
High level cloud: 89%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 7 / 8 mph 80 / 76°F 29% 1016 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 7 / 9 mph 84 / 78°F 22% 1014 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 11 / 12 mph 82 / 78°F 27% 1013 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 21%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 10 / 12 mph 69 / 69°F 47% 1014 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 08
Jul		01:00

WNW
WNW

 6 / 9 mph 63 / 63°F 87% 1012 mb
Low level cloud: 3%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
0.0 In
07:00

NE
NE

 8 / 11 mph 66 / 66°F 46% 1023 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NNW
NNW

 4 / 6 mph 80 / 80°F 40% 1012 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
45%
0.0 In
19:00

NNW
NNW

 11 / 16 mph 83 / 80°F 17% 1014 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 9%
Most Significant Cloud Type: medium
1%
0.0 In
Wed 09
Jul		01:00

NNE
NNE

 4 / 7 mph 65 / 65°F 66% 1020 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 21%
Most Significant Cloud Type: medium
15%
0.0 In
07:00

NW
NW

 2 / 3 mph 67 / 67°F 66% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
13:00

NNW
NNW

 5 / 8 mph 90 / 87°F 21% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

N
N

 11 / 17 mph 82 / 79°F 23% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 12%
Most Significant Cloud Type: medium
5%
0.0 In
Thu 10
Jul		01:00

NNW
NNW

 5 / 7 mph 76 / 78°F 64% 1020 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
07:00

W
W

 1 / 2 mph 70 / 70°F 50% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 33%
Most Significant Cloud Type: medium
4%
0.0 In
13:00

W
W

 9 / 11 mph 89 / 88°F 31% 1019 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 6%
Most Significant Cloud Type: medium
41%
0.0 In
19:00

N
N

 9 / 14 mph 88 / 86°F 28% 1018 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 49%
Most Significant Cloud Type: medium
14%
0.0 In
Fri 11
Jul		01:00

NW
NW

 5 / 6 mph 78 / 82°F 74% 1020 mb
Low level cloud: 1%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
07:00

NNE
NNE

 5 / 8 mph 74 / 77°F 62% 1020 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
13:00

WNW
WNW

 9 / 12 mph 89 / 90°F 40% 1019 mb
Low level cloud: 8%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
19:00

NNE
NNE

 10 / 15 mph 88 / 87°F 33% 1017 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.0 In
Sat 12
Jul		01:00

NNE
NNE

 6 / 8 mph 79 / 82°F 63% 1021 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

NE
NE

 4 / 6 mph 78 / 80°F 57% 1018 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 10%
Most Significant Cloud Type: medium
15%
0.0 In
13:00

NW
NW

 4 / 6 mph 100 / 102°F 27% 1020 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

N
N

 9 / 14 mph 86 / 85°F 34% 1016 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.0 In
Sun 13
Jul		01:00

NNE
NNE

 8 / 11 mph 80 / 82°F 50% 1021 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
07:00

N
N

 8 / 11 mph 76 / 78°F 57% 1020 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 61%
Most Significant Cloud Type: medium
20%
0.0 In
13:00

N
N

 6 / 8 mph 107 / 108°F 20% 1018 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
19:00

NNE
NNE

 7 / 11 mph 100 / 99°F 21% 1018 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
Mon 14
Jul		01:00

N
N

 8 / 10 mph 86 / 87°F 44% 1018 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
07:00

N
N

 7 / 11 mph 79 / 80°F 52% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 19%
Most Significant Cloud Type: medium
4%
0.0 In
13:00

NNW
NNW

 7 / 9 mph 105 / 105°F 21% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

N
N

 8 / 12 mph 102 / 102°F 19% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Tue 15
Jul		01:00

NNE
NNE

 8 / 11 mph 84 / 83°F 39% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
07:00

NE
NE

 6 / 10 mph 84 / 84°F 45% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
13:00

NNW
NNW

 9 / 11 mph 101 / 99°F 20% 1017 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

NNE
NNE

 13 / 20 mph 100 / 98°F 20% 1012 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
Wed 16
Jul		01:00

NNE
NNE

 11 / 14 mph 79 / 80°F 51% 1018 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

NNE
NNE

 8 / 11 mph 82 / 83°F 50% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NNE
NNE

 7 / 9 mph 102 / 102°F 21% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

N
N

 12 / 18 mph 102 / 101°F 19% 1010 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
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