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St. Etienne 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for St. Etienne

France

Long range weather outlook for St. Etienne includes 14 day forecast summary:

The forecast for St. Etienne in the coming two weeks is predicting the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 24°C expected on the afternoon of Monday 6th. The average minimum temperature will be 7°C, dipping to its lowest on the morning of Friday 3rd at 2°C. The next 14 days will have some days seeing a little precipitation and some days with rain. Predictions are Tuesday 7th will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 30
Apr		19:00

S
S

 3 / 5 mph 56 / 55°F 85% 1011 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 37%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 2 / 4 mph 51 / 51°F 90% 1011 mb
Low level cloud: 3%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 01
May		01:00

SSE
SSE

 1 / 3 mph 44 / 44°F 93% 1011 mb
Low level cloud: 14%
Mid level cloud: 66%
High level cloud: 7%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 2 / 3 mph 43 / 43°F 94% 1009 mb
Low level cloud: 18%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 2 / 2 mph 50 / 50°F 95% 1007 mb
Low level cloud: 42%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 5 / 6 mph 55 / 54°F 93% 1005 mb
Low level cloud: 93%
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

NW
NW

 3 / 4 mph 55 / 56°F 96% 1003 mb
Low level cloud: 92%
Mid level cloud: 44%
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

SW
SW

 4 / 4 mph 57 / 57°F 93% 1002 mb
Low level cloud: 89%
Mid level cloud: 58%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 5 / 8 mph 54 / 51°F 94% 1002 mb
Low level cloud: 27%
Mid level cloud: 67%
High level cloud: 92%
Most Significant Cloud Type: low
61%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

S
S

 4 / 6 mph 51 / 50°F 93% 1004 mb
Low level cloud: 41%
Mid level cloud: 66%
High level cloud: 99%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 02
May		01:00

SSW
SSW

 8 / 12 mph 49 / 46°F 93% 1004 mb
Low level cloud: 24%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

SSW
SSW

 7 / 9 mph 47 / 44°F 93% 1006 mb
Low level cloud: 40%
Mid level cloud: 58%
High level cloud: 99%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 3 / 4 mph 46 / 45°F 95% 1007 mb
Low level cloud: 89%
Mid level cloud: 91%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

NW
NW

 6 / 7 mph 47 / 44°F 89% 1010 mb
Low level cloud: 91%
Mid level cloud: 59%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

SW
SW

 3 / 4 mph 49 / 49°F 81% 1011 mb
Low level cloud: 84%
Mid level cloud: 94%
High level cloud: 43%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 4 / 5 mph 53 / 52°F 74% 1012 mb
Low level cloud: 31%
Mid level cloud: 99%
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

 1 / 1 mph 47 / 47°F 90% 1014 mb
Low level cloud: 3%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 3 / 5 mph 45 / 44°F 90% 1017 mb
Low level cloud: 32%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 03
May		01:00

SSW
SSW

 4 / 8 mph 40 / 38°F 92% 1017 mb
Low level cloud: 12%
Mid level cloud: 26%
High level cloud: 33%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 4 / 9 mph 36 / 32°F 93% 1018 mb
Low level cloud: 12%
Mid level cloud: 8%
High level cloud: 28%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 3 / 4 mph 42 / 40°F 90% 1019 mb
Low level cloud: 14%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 2 / 2 mph 56 / 54°F 69% 1019 mb
Low level cloud: 3%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

 3 / 3 mph 62 / 60°F 54% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 45%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 4 / 5 mph 63 / 61°F 53% 1016 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 4 / 7 mph 54 / 52°F 78% 1017 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 85%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 3 / 6 mph 44 / 43°F 85% 1018 mb
Low level cloud: 0%
Mid level cloud: 38%
High level cloud: 100%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 04
May		01:00

SSW
SSW

 5 / 10 mph 39 / 36°F 90% 1018 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 5 / 11 mph 40 / 36°F 87% 1017 mb
Low level cloud: 0%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: medium
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 4 / 7 mph 47 / 45°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: medium
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 4 / 5 mph 53 / 52°F 73% 1017 mb
Low level cloud: 0%
Mid level cloud: 86%
High level cloud: 45%
Most Significant Cloud Type: medium
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 2 / 4 mph 56 / 56°F 73% 1017 mb
Low level cloud: 0%
Mid level cloud: 96%
High level cloud: 98%
Most Significant Cloud Type: medium
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 5 / 7 mph 56 / 53°F 87% 1017 mb
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 32%
Most Significant Cloud Type: medium
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 3 / 6 mph 53 / 52°F 85% 1017 mb
Low level cloud: 6%
Mid level cloud: 74%
High level cloud: 5%
Most Significant Cloud Type: medium
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 4 / 8 mph 47 / 45°F 90% 1019 mb
Low level cloud: 2%
Mid level cloud: 43%
High level cloud: 57%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 05
May		01:00

SSW
SSW

 5 / 11 mph 43 / 40°F 92% 1020 mb
Low level cloud: 7%
Mid level cloud: 28%
High level cloud: 11%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 5 / 10 mph 42 / 39°F 93% 1019 mb
Low level cloud: 4%
Mid level cloud: 14%
High level cloud: 19%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 4 / 6 mph 50 / 48°F 89% 1019 mb
Low level cloud: 6%
Mid level cloud: 12%
High level cloud: 3%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 1 / 2 mph 67 / 65°F 68% 1018 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 2 / 3 mph 74 / 76°F 57% 1016 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

 3 / 4 mph 74 / 76°F 63% 1014 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 28%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 3 / 6 mph 64 / 61°F 82% 1014 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 39%
Most Significant Cloud Type: medium
44%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

S
S

 4 / 8 mph 52 / 51°F 90% 1015 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 33%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 06
May		01:00

S
S

 4 / 9 mph 50 / 49°F 92% 1014 mb
Low level cloud: 5%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 5 / 11 mph 49 / 47°F 93% 1012 mb
Low level cloud: 11%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 5 / 11 mph 53 / 50°F 89% 1012 mb
Low level cloud: 1%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 9 / 10 mph 66 / 64°F 68% 1013 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 9 / 10 mph 74 / 76°F 54% 1011 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 83%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 7 / 9 mph 76 / 77°F 60% 1009 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 70%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 8 / 15 mph 63 / 61°F 76% 1010 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 18%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 5 / 11 mph 50 / 47°F 81% 1012 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 07
May		01:00

WSW
WSW

 1 / 1 mph 50 / 50°F 92% 1018 mb
Low level cloud: 8%
Mid level cloud: 43%
High level cloud: 31%
Most Significant Cloud Type: medium
66%
0.0 In
07:00

NW
NW

 2 / 4 mph 52 / 53°F 95% 1023 mb
Low level cloud: 82%
Mid level cloud: 24%
High level cloud: 6%
Most Significant Cloud Type: low
91%
0.0 In
13:00

N
N

 6 / 12 mph 65 / 65°F 71% 1021 mb
Low level cloud: 77%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.0 In
19:00

N
N

 4 / 9 mph 64 / 64°F 84% 1017 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 33%
Most Significant Cloud Type: medium
17%
0.0 In
Wed 08
May		01:00

WNW
WNW

 3 / 6 mph 45 / 44°F 96% 1021 mb
Low level cloud: 33%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
07:00

WNW
WNW

 1 / 2 mph 52 / 52°F 94% 1017 mb
Low level cloud: 80%
Mid level cloud: 46%
High level cloud: 72%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNW
NNW

 8 / 17 mph 53 / 50°F 91% 1015 mb
Low level cloud: 94%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NNW
NNW

 12 / 25 mph 57 / 54°F 92% 1020 mb
Low level cloud: 77%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.0 In
Thu 09
May		01:00

NNW
NNW

 9 / 18 mph 38 / 32°F 90% 1017 mb
Low level cloud: 13%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
07:00

NNW
NNW

 7 / 16 mph 48 / 45°F 93% 1020 mb
Low level cloud: 98%
Mid level cloud: 92%
High level cloud: 17%
Most Significant Cloud Type: low
100%
0.0 In
13:00

N
N

 16 / 34 mph 56 / 52°F 56% 1015 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: medium
49%
0.0 In
19:00

NNW
NNW

 9 / 18 mph 51 / 48°F 85% 1018 mb
Low level cloud: 95%
Mid level cloud: 73%
High level cloud: 34%
Most Significant Cloud Type: low
100%
0.0 In
Fri 10
May		01:00

NNW
NNW

 10 / 22 mph 41 / 35°F 95% 1018 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NNW
NNW

 7 / 15 mph 51 / 48°F 98% 1017 mb
Low level cloud: 98%
Mid level cloud: 51%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNE
NNE

 7 / 15 mph 51 / 49°F 70% 1018 mb
Low level cloud: 82%
Mid level cloud: 92%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
19:00

N
N

 9 / 19 mph 57 / 55°F 82% 1016 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
Sat 11
May		01:00

NNW
NNW

 8 / 17 mph 48 / 44°F 83% 1018 mb
Low level cloud: 21%
Mid level cloud: 29%
High level cloud: 17%
Most Significant Cloud Type: low
33%
0.0 In
07:00

NNW
NNW

 6 / 12 mph 49 / 46°F 95% 1019 mb
Low level cloud: 96%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
13:00

NNW
NNW

 9 / 18 mph 60 / 60°F 65% 1017 mb
Low level cloud: 45%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
61%
0.0 In
19:00

ENE
ENE

 3 / 7 mph 65 / 65°F 80% 1016 mb
Low level cloud: 9%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
Sun 12
May		01:00

W
W

 3 / 6 mph 46 / 45°F 92% 1020 mb
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
07:00

S
S

 4 / 7 mph 56 / 56°F 88% 1015 mb
Low level cloud: 4%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: low
7%
0.0 In
13:00

NNW
NNW

 4 / 9 mph 68 / 68°F 61% 1019 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

S
S

 8 / 17 mph 59 / 57°F 69% 1011 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 32%
Most Significant Cloud Type: medium
31%
0.0 In
Mon 13
May		01:00

S
S

 4 / 8 mph 49 / 48°F 91% 1020 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
07:00

SSE
SSE

 2 / 5 mph 55 / 56°F 85% 1011 mb
Low level cloud: 6%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

S
S

 4 / 8 mph 80 / 81°F 47% 1014 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 17%
Most Significant Cloud Type: medium
10%
0.0 In
19:00

NNW
NNW

 3 / 6 mph 57 / 58°F 98% 1010 mb
Low level cloud: 94%
Mid level cloud: 90%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.1 In
Tue 14
May		01:00

SSW
SSW

 7 / 15 mph 47 / 43°F 86% 1013 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 7%
Most Significant Cloud Type: medium
12%
0.0 In
07:00

NNW
NNW

 9 / 20 mph 52 / 48°F 99% 1015 mb
Low level cloud: 99%
Mid level cloud: 68%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

SSW
SSW

 8 / 17 mph 72 / 76°F 50% 1009 mb
Low level cloud: 0%
Mid level cloud: 85%
High level cloud: 13%
Most Significant Cloud Type: medium
85%
0.0 In
19:00

NNW
NNW

 9 / 20 mph 52 / 48°F 77% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 15
May		01:00

SSW
SSW

 5 / 10 mph 50 / 48°F 94% 1013 mb
Low level cloud: 56%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.1 In
07:00

NNW
NNW

 6 / 12 mph 45 / 42°F 81% 1019 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.0 In
13:00

WNW
WNW

 6 / 13 mph 65 / 65°F 57% 1013 mb
Low level cloud: 1%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
19:00

NNE
NNE

 5 / 11 mph 60 / 60°F 76% 1015 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In

Other Locations Near to St. Etienne

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