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Aosta 14 Day Long Range Forecast

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

Italy

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

Taking a look at Aosta over the coming two weeks and the average daytime maximum temperature will be around 13°C, with a high for the two weeks of 20°C expected on the afternoon of Saturday 4th. The mean minimum temperature will be 3°C, dipping to its lowest on the morning of Monday 29th at -3°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. The indicators are that Monday 6th will have the most precipitation with an accumulation of around 16.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 26
Apr
16:00

ESE
ESE

8 / 9 mph 45 / 41°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 96%
High level cloud: 98%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

5 / 6 mph 42 / 38°F 93% 1012 mb
Low level cloud: 60%
Mid level cloud: 73%
High level cloud: 2%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

3 / 4 mph 40 / 38°F 96% 1014 mb
Low level cloud: 84%
Mid level cloud: 79%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 27
Apr
01:00

ESE
ESE

3 / 4 mph 40 / 38°F 96% 1014 mb
Low level cloud: 64%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

4 / 5 mph 40 / 37°F 97% 1014 mb
Low level cloud: 80%
Mid level cloud: 67%
High level cloud: 35%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

6 / 7 mph 41 / 37°F 98% 1015 mb
Low level cloud: 86%
Mid level cloud: 62%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

8 / 9 mph 44 / 39°F 90% 1015 mb
Low level cloud: 44%
Mid level cloud: 43%
High level cloud: 5%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

9 / 11 mph 48 / 44°F 79% 1014 mb
Low level cloud: 2%
Mid level cloud: 51%
High level cloud: 32%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

8 / 10 mph 46 / 42°F 86% 1015 mb
Low level cloud: 17%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

7 / 8 mph 44 / 39°F 99% 1017 mb
Low level cloud: 93%
Mid level cloud: 87%
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

E
E

6 / 7 mph 43 / 40°F 99% 1018 mb
Low level cloud: 95%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 28
Apr
01:00

E
E

4 / 4 mph 43 / 41°F 99% 1018 mb
Low level cloud: 94%
Mid level cloud: 84%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

E
E

5 / 6 mph 43 / 40°F 99% 1018 mb
Low level cloud: 96%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

ESE
ESE

5 / 6 mph 43 / 40°F 99% 1019 mb
Low level cloud: 94%
Mid level cloud: 81%
High level cloud: 51%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

E
E

6 / 6 mph 45 / 42°F 99% 1020 mb
Low level cloud: 93%
Mid level cloud: 84%
High level cloud: 59%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

5 / 6 mph 45 / 42°F 100% 1021 mb
Low level cloud: 98%
Mid level cloud: 86%
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

E
E

5 / 6 mph 46 / 43°F 99% 1021 mb
Low level cloud: 92%
Mid level cloud: 90%
High level cloud: 64%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

5 / 6 mph 46 / 44°F 99% 1021 mb
Low level cloud: 92%
Mid level cloud: 90%
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

ESE
ESE

4 / 9 mph 31 / 27°F 98% 1024 mb
Low level cloud: 73%
Mid level cloud: 31%
High level cloud: 81%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 29
Apr
01:00

ESE
ESE

3 / 6 mph 28 / 26°F 96% 1025 mb
Low level cloud: 47%
Mid level cloud: 24%
High level cloud: 21%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

1 / 2 mph 27 / 27°F 94% 1026 mb
Low level cloud: 31%
Mid level cloud: 33%
High level cloud: 1%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

1 / 2 mph 45 / 44°F 88% 1024 mb
Low level cloud: 6%
Mid level cloud: 35%
High level cloud: 8%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

5 / 6 mph 54 / 51°F 80% 1021 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 19%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

7 / 8 mph 53 / 50°F 89% 1021 mb
Low level cloud: 38%
Mid level cloud: 53%
High level cloud: 12%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

5 / 6 mph 53 / 50°F 91% 1021 mb
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

4 / 5 mph 44 / 41°F 94% 1022 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

2 / 5 mph 36 / 35°F 93% 1025 mb
Low level cloud: 24%
Mid level cloud: 44%
High level cloud: 55%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 30
Apr
01:00

ENE
ENE

2 / 2 mph 40 / 39°F 95% 1024 mb
Low level cloud: 37%
Mid level cloud: 51%
High level cloud: 33%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

2 / 3 mph 44 / 44°F 98% 1022 mb
Low level cloud: 72%
Mid level cloud: 50%
High level cloud: 13%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

E
E

4 / 5 mph 47 / 45°F 99% 1021 mb
Low level cloud: 92%
Mid level cloud: 71%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

ESE
ESE

6 / 7 mph 51 / 49°F 98% 1020 mb
Low level cloud: 75%
Mid level cloud: 66%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

ESE
ESE

6 / 8 mph 54 / 52°F 88% 1019 mb
Low level cloud: 16%
Mid level cloud: 52%
High level cloud: 72%
Most Significant Cloud Type: medium
99%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

ESE
ESE

6 / 7 mph 53 / 51°F 95% 1018 mb
Low level cloud: 62%
Mid level cloud: 61%
High level cloud: 32%
Most Significant Cloud Type: low
87%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

ESE
ESE

3 / 4 mph 50 / 49°F 98% 1018 mb
Low level cloud: 76%
Mid level cloud: 52%
High level cloud: 5%
Most Significant Cloud Type: low
94%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
22:00

ENE
ENE

2 / 3 mph 48 / 48°F 97% 1017 mb
Low level cloud: 62%
Mid level cloud: 62%
High level cloud: 81%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 01
May
01:00

ENE
ENE

4 / 5 mph 48 / 46°F 99% 1016 mb
Low level cloud: 92%
Mid level cloud: 69%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

E
E

4 / 4 mph 47 / 46°F 97% 1016 mb
Low level cloud: 67%
Mid level cloud: 92%
High level cloud: 8%
Most Significant Cloud Type: low
99%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

E
E

3 / 4 mph 46 / 45°F 97% 1017 mb
Low level cloud: 88%
Mid level cloud: 80%
High level cloud: 88%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

ESE
ESE

3 / 3 mph 49 / 49°F 95% 1015 mb
Low level cloud: 71%
Mid level cloud: 77%
High level cloud: 5%
Most Significant Cloud Type: low
98%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

SSE
SSE

2 / 3 mph 55 / 54°F 87% 1012 mb
Low level cloud: 22%
Mid level cloud: 46%
High level cloud: 35%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

4 / 4 mph 59 / 57°F 72% 1010 mb
Low level cloud: 0%
Mid level cloud: 54%
High level cloud: 72%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

3 / 6 mph 43 / 40°F 86% 1010 mb
Low level cloud: 0%
Mid level cloud: 65%
High level cloud: 96%
Most Significant Cloud Type: medium
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

1 / 3 mph 38 / 38°F 89% 1012 mb
Low level cloud: 3%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: medium
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 02
May
01:00

WSW
WSW

2 / 4 mph 37 / 36°F 87% 1012 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

1 / 2 mph 36 / 36°F 86% 1011 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

1 / 1 mph 50 / 49°F 84% 1010 mb
Low level cloud: 7%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

3 / 4 mph 54 / 52°F 85% 1009 mb
Low level cloud: 26%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

4 / 4 mph 50 / 49°F 96% 1009 mb
Low level cloud: 86%
Mid level cloud: 76%
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

ESE
ESE

2 / 2 mph 50 / 49°F 96% 1009 mb
Low level cloud: 84%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

NW
NW

0 / 0 mph 49 / 49°F 98% 1008 mb
Low level cloud: 87%
Mid level cloud: 72%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

3 / 3 mph 48 / 48°F 99% 1009 mb
Low level cloud: 89%
Mid level cloud: 72%
High level cloud: 33%
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
Fri 03
May
01:00

W
W

2 / 3 mph 46 / 46°F 100% 1005 mb
Low level cloud: 98%
Mid level cloud: 90%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

ESE
ESE

2 / 3 mph 45 / 45°F 92% 1008 mb
Low level cloud: 59%
Mid level cloud: 43%
High level cloud: 4%
Most Significant Cloud Type: low
74%
0.0 In
13:00

ESE
ESE

6 / 11 mph 53 / 51°F 65% 1007 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 99%
Most Significant Cloud Type: medium
47%
0.0 In
19:00

ESE
ESE

6 / 12 mph 50 / 48°F 79% 1013 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 99%
Most Significant Cloud Type: medium
13%
0.0 In
Sat 04
May
01:00

SSW
SSW

1 / 2 mph 42 / 42°F 85% 1016 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
0.0 In
07:00

W
W

6 / 11 mph 51 / 49°F 90% 1006 mb
Low level cloud: 24%
Mid level cloud: 44%
High level cloud: 91%
Most Significant Cloud Type: low
50%
0.0 In
13:00

W
W

10 / 20 mph 43 / 38°F 93% 1014 mb
Low level cloud: 42%
Mid level cloud: 100%
High level cloud: 64%
Most Significant Cloud Type: low
84%
0.0 In
19:00

SE
SE

5 / 9 mph 59 / 58°F 82% 1014 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 10%
Most Significant Cloud Type: medium
18%
0.0 In
Sun 05
May
01:00

WNW
WNW

6 / 12 mph 27 / 20°F 81% 1018 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: medium
6%
0.2 In
07:00

E
E

4 / 8 mph 54 / 53°F 92% 1016 mb
Low level cloud: 44%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: low
59%
0.0 In
13:00

W
W

4 / 8 mph 65 / 65°F 49% 1011 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 11%
Most Significant Cloud Type: medium
16%
0.0 In
19:00

ESE
ESE

6 / 12 mph 54 / 52°F 95% 1014 mb
Low level cloud: 56%
Mid level cloud: 70%
High level cloud: 84%
Most Significant Cloud Type: low
90%
0.1 In
Mon 06
May
01:00

WNW
WNW

4 / 8 mph 38 / 36°F 81% 1019 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 7%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

WNW
WNW

1 / 2 mph 47 / 47°F 98% 1020 mb
Low level cloud: 89%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.8 In
13:00

SSE
SSE

2 / 5 mph 74 / 76°F 40% 1016 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: medium
8%
0.0 In
19:00

ESE
ESE

2 / 5 mph 54 / 54°F 89% 1017 mb
Low level cloud: 8%
Mid level cloud: 29%
High level cloud: 13%
Most Significant Cloud Type: medium
51%
0.0 In
Tue 07
May
01:00

WNW
WNW

2 / 3 mph 47 / 47°F 67% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

W
W

2 / 5 mph 54 / 55°F 83% 1018 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: medium
22%
0.0 In
13:00

ESE
ESE

4 / 8 mph 76 / 77°F 37% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 10%
Most Significant Cloud Type: medium
4%
0.0 In
19:00

WSW
WSW

4 / 8 mph 49 / 47°F 70% 1017 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 9%
Most Significant Cloud Type: medium
12%
0.0 In
Wed 08
May
01:00

ESE
ESE

1 / 2 mph 48 / 48°F 90% 1023 mb
Low level cloud: 5%
Mid level cloud: 27%
High level cloud: 44%
Most Significant Cloud Type: medium
43%
0.0 In
07:00

NNE
NNE

1 / 3 mph 54 / 54°F 85% 1019 mb
Low level cloud: 22%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: low
39%
0.0 In
13:00

E
E

7 / 14 mph 69 / 69°F 58% 1022 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 12%
Most Significant Cloud Type: medium
9%
0.0 In
19:00

ESE
ESE

5 / 11 mph 56 / 56°F 90% 1016 mb
Low level cloud: 36%
Mid level cloud: 44%
High level cloud: 98%
Most Significant Cloud Type: low
63%
0.0 In
Thu 09
May
01:00

E
E

3 / 6 mph 55 / 56°F 94% 1025 mb
Low level cloud: 41%
Mid level cloud: 46%
High level cloud: 51%
Most Significant Cloud Type: low
63%
0.0 In
07:00

ENE
ENE

3 / 7 mph 55 / 55°F 93% 1016 mb
Low level cloud: 73%
Mid level cloud: 68%
High level cloud: 7%
Most Significant Cloud Type: low
97%
0.0 In
13:00

ESE
ESE

5 / 10 mph 73 / 76°F 46% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

W
W

6 / 13 mph 53 / 51°F 88% 1019 mb
Low level cloud: 11%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
61%
0.2 In
Fri 10
May
01:00

W
W

1 / 3 mph 48 / 48°F 84% 1027 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
07:00

WSW
WSW

2 / 3 mph 55 / 55°F 69% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
13:00

ESE
ESE

3 / 7 mph 79 / 77°F 26% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

ESE
ESE

6 / 12 mph 60 / 60°F 80% 1022 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 19%
Most Significant Cloud Type: medium
19%
0.0 In
Sat 11
May
01:00

SW
SW

1 / 2 mph 49 / 49°F 94% 1030 mb
Low level cloud: 26%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
54%
0.1 In
07:00

E
E

3 / 6 mph 56 / 56°F 91% 1023 mb
Low level cloud: 62%
Mid level cloud: 64%
High level cloud: 6%
Most Significant Cloud Type: low
85%
0.0 In
13:00

E
E

5 / 11 mph 76 / 77°F 42% 1026 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 15%
Most Significant Cloud Type: medium
15%
0.0 In
19:00

E
E

1 / 2 mph 56 / 56°F 97% 1022 mb
Low level cloud: 65%
Mid level cloud: 74%
High level cloud: 4%
Most Significant Cloud Type: low
90%
0.3 In

Other Locations Near to Aosta

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