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Grenoble 14 Day Long Range Forecast

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

France

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

The outlook for Grenoble in the two weeks ahead shows the average daytime maximum temperature will be around 13°C, with a high for the two weeks of 19°C expected on the afternoon of Saturday 1st. The average minimum temperature will be 7°C, dipping to its lowest on the morning of Wednesday 29th at 2°C. The coming 14 days will have some days seeing a little precipitation and some days with rain. The indicators are that Friday 31st will have the most precipitation with an accumulation of around 15.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
Oct		19:00

SSW
SSW

 4 / 4 mph 50 / 49°F 92% 1015 mb
Low level cloud: 57%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 5 / 7 mph 48 / 46°F 88% 1015 mb
Low level cloud: 68%
Mid level cloud: 48%
High level cloud: 18%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
Oct		01:00

SSW
SSW

 6 / 11 mph 48 / 45°F 87% 1014 mb
Low level cloud: 70%
Mid level cloud: 83%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 3 / 5 mph 46 / 46°F 94% 1013 mb
Low level cloud: 90%
Mid level cloud: 94%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

S
S

 6 / 12 mph 46 / 43°F 93% 1013 mb
Low level cloud: 31%
Mid level cloud: 84%
High level cloud: 11%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 7 / 12 mph 49 / 46°F 87% 1012 mb
Low level cloud: 16%
Mid level cloud: 88%
High level cloud: 95%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 9 / 12 mph 52 / 48°F 90% 1011 mb
Low level cloud: 23%
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
16:00

SSW
SSW

 13 / 21 mph 52 / 48°F 84% 1010 mb
Low level cloud: 62%
Mid level cloud: 86%
High level cloud: 13%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 7 / 13 mph 51 / 48°F 89% 1013 mb
Low level cloud: 11%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
80%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

WNW
WNW

 4 / 5 mph 49 / 48°F 92% 1015 mb
Low level cloud: 19%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
Oct		01:00

E
E

 3 / 6 mph 43 / 42°F 92% 1015 mb
Low level cloud: 34%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 2 / 3 mph 42 / 42°F 92% 1015 mb
Low level cloud: 86%
Mid level cloud: 63%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 4 / 6 mph 44 / 42°F 92% 1015 mb
Low level cloud: 85%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 5 / 6 mph 48 / 45°F 75% 1017 mb
Low level cloud: 14%
Mid level cloud: 32%
High level cloud: 3%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 9 / 11 mph 51 / 47°F 66% 1017 mb
Low level cloud: 56%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 7 / 9 mph 47 / 43°F 80% 1018 mb
Low level cloud: 79%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 4 / 5 mph 44 / 42°F 92% 1020 mb
Low level cloud: 68%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 5 / 10 mph 39 / 35°F 95% 1020 mb
Low level cloud: 13%
Mid level cloud: 33%
High level cloud: 3%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
Oct		01:00

SE
SE

 3 / 6 mph 41 / 39°F 85% 1019 mb
Low level cloud: 41%
Mid level cloud: 44%
High level cloud: 59%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 3 / 6 mph 42 / 40°F 83% 1018 mb
Low level cloud: 68%
Mid level cloud: 83%
High level cloud: 27%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 6 / 9 mph 43 / 39°F 90% 1017 mb
Low level cloud: 81%
Mid level cloud: 84%
High level cloud: 28%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 5 / 9 mph 44 / 41°F 91% 1017 mb
Low level cloud: 97%
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
13:00

S
S

 6 / 10 mph 46 / 43°F 93% 1016 mb
Low level cloud: 97%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

S
S

 4 / 6 mph 47 / 45°F 96% 1015 mb
Low level cloud: 97%
Mid level cloud: 98%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

S
S

 2 / 2 mph 47 / 47°F 97% 1018 mb
Low level cloud: 78%
Mid level cloud: 83%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

E
E

 2 / 4 mph 45 / 45°F 95% 1019 mb
Low level cloud: 54%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
Oct		01:00

ENE
ENE

 2 / 4 mph 44 / 44°F 92% 1020 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
04:00

NE
NE

 4 / 9 mph 44 / 42°F 90% 1020 mb
Low level cloud: 34%
Mid level cloud: 99%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 5 / 9 mph 46 / 43°F 85% 1021 mb
Low level cloud: 66%
Mid level cloud: 94%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 5 / 6 mph 50 / 48°F 82% 1022 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 9 / 10 mph 56 / 53°F 68% 1021 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 9 / 10 mph 56 / 53°F 73% 1020 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
19:00

NNE
NNE

 4 / 9 mph 45 / 42°F 93% 1021 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 2 / 3 mph 43 / 42°F 94% 1020 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
Oct		01:00

ESE
ESE

 3 / 6 mph 40 / 39°F 91% 1020 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 4 / 9 mph 39 / 36°F 88% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 4 / 9 mph 36 / 33°F 80% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 44%
Most Significant Cloud Type: high
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 4 / 5 mph 52 / 51°F 62% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 8 / 9 mph 59 / 57°F 56% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 19%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 8 / 11 mph 59 / 57°F 70% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 26%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 4 / 9 mph 47 / 46°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 77%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 4 / 8 mph 51 / 50°F 78% 1014 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 37%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 30
Oct		01:00

ESE
ESE

 3 / 6 mph 50 / 50°F 81% 1013 mb
Low level cloud: 0%
Mid level cloud: 83%
High level cloud: 94%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 3 / 7 mph 48 / 48°F 85% 1012 mb
Low level cloud: 0%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: medium
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 3 / 7 mph 48 / 47°F 86% 1012 mb
Low level cloud: 0%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: medium
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 3 / 4 mph 51 / 51°F 95% 1014 mb
Low level cloud: 48%
Mid level cloud: 98%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

SSE
SSE

 3 / 4 mph 54 / 54°F 92% 1013 mb
Low level cloud: 38%
Mid level cloud: 69%
High level cloud: 20%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 3 / 5 mph 54 / 54°F 92% 1013 mb
Low level cloud: 22%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 3 / 6 mph 53 / 53°F 92% 1014 mb
Low level cloud: 6%
Mid level cloud: 27%
High level cloud: 32%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 4 / 8 mph 51 / 50°F 92% 1014 mb
Low level cloud: 1%
Mid level cloud: 23%
High level cloud: 46%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 31
Oct		01:00

SSE
SSE

 3 / 7 mph 51 / 50°F 92% 1014 mb
Low level cloud: 7%
Mid level cloud: 45%
High level cloud: 6%
Most Significant Cloud Type: medium
63%
0.0 In
07:00

NNW
NNW

 7 / 15 mph 47 / 44°F 97% 1023 mb
Low level cloud: 89%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SSW
SSW

 4 / 7 mph 63 / 63°F 78% 1015 mb
Low level cloud: 18%
Mid level cloud: 25%
High level cloud: 100%
Most Significant Cloud Type: low
38%
0.0 In
19:00

SE
SE

 4 / 8 mph 54 / 54°F 74% 1018 mb
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 8%
Most Significant Cloud Type: medium
39%
0.0 In
Sat 01
Nov		01:00

SSE
SSE

 4 / 8 mph 52 / 52°F 88% 1022 mb
Low level cloud: 6%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
67%
0.0 In
07:00

SSE
SSE

 4 / 7 mph 49 / 48°F 95% 1016 mb
Low level cloud: 21%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
13:00

ESE
ESE

 10 / 20 mph 62 / 62°F 69% 999 mb
Low level cloud: 0%
Mid level cloud: 33%
High level cloud: 72%
Most Significant Cloud Type: medium
35%
0.0 In
19:00

SSE
SSE

 3 / 7 mph 56 / 56°F 82% 1011 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 20%
Most Significant Cloud Type: medium
25%
0.0 In
Sun 02
Nov		01:00

SE
SE

 3 / 6 mph 51 / 50°F 95% 1005 mb
Low level cloud: 46%
Mid level cloud: 63%
High level cloud: 72%
Most Significant Cloud Type: low
76%
1.6 In
07:00

SE
SE

 5 / 11 mph 51 / 50°F 81% 1010 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
0.0 In
13:00

S
S

 4 / 8 mph 60 / 60°F 68% 1006 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 53%
Most Significant Cloud Type: high
52%
0.0 In
19:00

SE
SE

 6 / 13 mph 55 / 53°F 92% 1010 mb
Low level cloud: 11%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Mon 03
Nov		01:00

SSE
SSE

 3 / 6 mph 52 / 52°F 84% 1004 mb
Low level cloud: 0%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

SE
SE

 4 / 10 mph 55 / 54°F 85% 1010 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 36%
Most Significant Cloud Type: medium
46%
0.0 In
13:00

SE
SE

 3 / 6 mph 57 / 58°F 92% 1004 mb
Low level cloud: 50%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
87%
0.4 In
19:00

SSE
SSE

 18 / 37 mph 65 / 65°F 57% 1005 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
0.0 In
Tue 04
Nov		01:00

S
S

 5 / 11 mph 52 / 51°F 95% 1005 mb
Low level cloud: 32%
Mid level cloud: 32%
High level cloud: 36%
Most Significant Cloud Type: low
47%
0.2 In
07:00

WNW
WNW

 4 / 9 mph 54 / 53°F 91% 1014 mb
Low level cloud: 53%
Mid level cloud: 100%
High level cloud: 17%
Most Significant Cloud Type: low
89%
0.6 In
13:00

SW
SW

 7 / 16 mph 61 / 62°F 68% 1009 mb
Low level cloud: 4%
Mid level cloud: 20%
High level cloud: 8%
Most Significant Cloud Type: medium
31%
0.7 In
19:00

N
N

 3 / 7 mph 49 / 48°F 95% 1016 mb
Low level cloud: 20%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.1 In
Wed 05
Nov		01:00

ENE
ENE

 3 / 7 mph 48 / 48°F 87% 1012 mb
Low level cloud: 0%
Mid level cloud: 38%
High level cloud: 100%
Most Significant Cloud Type: medium
41%
0.0 In
07:00

NNE
NNE

 1 / 2 mph 48 / 48°F 93% 1014 mb
Low level cloud: 61%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: low
63%
0.0 In
13:00

ESE
ESE

 2 / 5 mph 63 / 63°F 61% 1005 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 61%
Most Significant Cloud Type: high
61%
0.0 In
19:00

SSE
SSE

 4 / 8 mph 50 / 49°F 82% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
7%
0.0 In
Thu 06
Nov		01:00

E
E

 6 / 12 mph 49 / 46°F 91% 997 mb
Low level cloud: 15%
Mid level cloud: 45%
High level cloud: 13%
Most Significant Cloud Type: medium
86%
0.1 In
07:00

SSE
SSE

 4 / 8 mph 42 / 40°F 77% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: medium
3%
0.0 In
13:00

SSE
SSE

 5 / 10 mph 62 / 62°F 73% 998 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 36%
Most Significant Cloud Type: medium
16%
1.1 In
19:00

SSW
SSW

 10 / 21 mph 50 / 46°F 73% 1013 mb
Low level cloud: 0%
Mid level cloud: 60%
High level cloud: 71%
Most Significant Cloud Type: medium
62%
0.0 In
Fri 07
Nov		01:00

SSE
SSE

 5 / 11 mph 49 / 47°F 88% 1002 mb
Low level cloud: 10%
Mid level cloud: 44%
High level cloud: 38%
Most Significant Cloud Type: medium
72%
0.0 In
07:00

S
S

 7 / 15 mph 49 / 46°F 91% 1013 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
87%
0.1 In
13:00

SSW
SSW

 7 / 15 mph 56 / 55°F 80% 1003 mb
Low level cloud: 10%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
58%
0.3 In
19:00

SE
SE

 3 / 6 mph 52 / 52°F 81% 1018 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
13%
0.2 In
Sat 08
Nov		01:00

SSE
SSE

 7 / 15 mph 49 / 45°F 93% 1003 mb
Low level cloud: 33%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: low
74%
0.1 In
07:00

SSE
SSE

 8 / 17 mph 46 / 42°F 87% 1017 mb
Low level cloud: 29%
Mid level cloud: 97%
High level cloud: 92%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

WSW
WSW

 8 / 17 mph 57 / 56°F 73% 1007 mb
Low level cloud: 5%
Mid level cloud: 49%
High level cloud: 14%
Most Significant Cloud Type: medium
63%
0.3 In
19:00

SSW
SSW

 17 / 36 mph 54 / 49°F 86% 1013 mb
Low level cloud: 6%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.3 In

Other Locations Near to Grenoble

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