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Datun 14 Day Long Range Forecast

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

China

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

The next 14 day outlook for Datun shows the average daytime maximum temperature will be around 34°C, with a high for the two weeks of 36°C expected on the afternoon of Sunday 28th. The average minimum temperature will be 16°C, dipping to its lowest on the morning of Sunday 5th at 13°C. Expect the coming 14 days to have most days seeing a little rain. Predictions are Sunday 5th will have the most precipitation with an accumulation of around 3.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 27
Apr		20:00

SSW
SSW

 5 / 11 mph 75 / 74°F 23% 1003 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
23:00

S
S

 2 / 5 mph 71 / 71°F 27% 1006 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
Sun 28
Apr		02:00

WSW
WSW

 1 / 3 mph 67 / 67°F 31% 1006 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
05:00

SSW
SSW

 3 / 6 mph 64 / 64°F 34% 1006 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
08:00

SSW
SSW

 2 / 3 mph 75 / 74°F 32% 1008 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
11:00

SW
SW

 12 / 14 mph 90 / 85°F 21% 1006 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
14:00

SW
SW

 16 / 18 mph 97 / 93°F 15% 1003 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
17:00

WSW
WSW

 17 / 19 mph 97 / 93°F 14% 1001 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 6%
Most Significant Cloud Type: high
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SW
SW

 10 / 21 mph 80 / 78°F 22% 1003 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SW
SW

 4 / 9 mph 79 / 77°F 27% 1006 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
Mon 29
Apr		02:00

SW
SW

 3 / 6 mph 70 / 70°F 30% 1006 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 7%
Most Significant Cloud Type: high
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SSW
SSW

 2 / 5 mph 67 / 67°F 33% 1006 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

SSW
SSW

 3 / 3 mph 78 / 76°F 32% 1007 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
11:00

WSW
WSW

 15 / 17 mph 91 / 87°F 23% 1006 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 9%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WSW
WSW

 21 / 24 mph 96 / 92°F 18% 1002 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 8%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WSW
WSW

 21 / 24 mph 96 / 92°F 16% 998 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

WSW
WSW

 11 / 23 mph 78 / 76°F 22% 1001 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
23:00

WSW
WSW

 5 / 9 mph 76 / 76°F 32% 1004 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
Tue 30
Apr		02:00

SW
SW

 2 / 4 mph 68 / 68°F 36% 1004 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 10%
Most Significant Cloud Type: high
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

W
W

 2 / 5 mph 66 / 66°F 38% 1004 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

S
S

 5 / 7 mph 76 / 75°F 34% 1004 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
11:00

SW
SW

 15 / 17 mph 91 / 86°F 20% 1003 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
14:00

W
W

 17 / 19 mph 94 / 89°F 16% 1000 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WNW
WNW

 17 / 19 mph 95 / 90°F 15% 998 mb
Low level cloud: 0%
Mid level cloud: 54%
High level cloud: 0%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

W
W

 8 / 17 mph 74 / 74°F 26% 1001 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

S
S

 3 / 6 mph 73 / 74°F 31% 1004 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 96%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 01
May		02:00

SW
SW

 3 / 7 mph 68 / 68°F 37% 1003 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 20%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SSW
SSW

 3 / 7 mph 65 / 65°F 42% 1004 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

SSE
SSE

 6 / 7 mph 73 / 76°F 48% 1005 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 11%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

SW
SW

 15 / 17 mph 89 / 85°F 26% 1004 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WSW
WSW

 14 / 16 mph 92 / 87°F 22% 1000 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SW
SW

 13 / 15 mph 89 / 85°F 26% 999 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 18%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SSE
SSE

 5 / 10 mph 70 / 70°F 43% 1002 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SSE
SSE

 6 / 11 mph 67 / 67°F 55% 1006 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
Thu 02
May		02:00

SSE
SSE

 4 / 9 mph 62 / 62°F 77% 1006 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
05:00

SSE
SSE

 5 / 10 mph 59 / 59°F 89% 1006 mb
Low level cloud: 11%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

SSE
SSE

 5 / 6 mph 75 / 76°F 80% 1007 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

SW
SW

 10 / 11 mph 89 / 87°F 36% 1005 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

SSW
SSW

 13 / 15 mph 95 / 91°F 22% 1001 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SW
SW

 13 / 15 mph 96 / 91°F 18% 998 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

S
S

 7 / 14 mph 75 / 76°F 35% 1001 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SSE
SSE

 7 / 14 mph 65 / 65°F 76% 1005 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 03
May		02:00

SSE
SSE

 6 / 13 mph 63 / 63°F 90% 1006 mb
Low level cloud: 20%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SSE
SSE

 6 / 13 mph 62 / 62°F 94% 1007 mb
Low level cloud: 41%
Mid level cloud: 15%
High level cloud: 1%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

S
S

 6 / 7 mph 76 / 77°F 80% 1008 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

SW
SW

 9 / 11 mph 88 / 84°F 35% 1008 mb
Low level cloud: 0%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

SW
SW

 13 / 15 mph 93 / 90°F 26% 1004 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
17:00

WSW
WSW

 17 / 19 mph 93 / 89°F 22% 1002 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

WNW
WNW

 10 / 21 mph 72 / 75°F 37% 1005 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

S
S

 5 / 10 mph 65 / 65°F 56% 1009 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 3%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 04
May		02:00

SSE
SSE

 9 / 14 mph 67 / 67°F 85% 1010 mb
Low level cloud: 5%
Mid level cloud: 10%
High level cloud: 2%
Most Significant Cloud Type: low
8%
0.0 In
08:00

SSE
SSE

 7 / 15 mph 68 / 68°F 88% 1011 mb
Low level cloud: 39%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.0 In
14:00

SSW
SSW

 11 / 22 mph 87 / 88°F 39% 1008 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 1%
Most Significant Cloud Type: medium
17%
0.0 In
20:00

S
S

 7 / 14 mph 70 / 70°F 63% 1006 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
Sun 05
May		02:00

SSE
SSE

 5 / 10 mph 63 / 63°F 89% 1008 mb
Low level cloud: 15%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
08:00

SSE
SSE

 6 / 12 mph 75 / 79°F 74% 1007 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
14:00

SW
SW

 9 / 15 mph 92 / 90°F 25% 1004 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 18%
Most Significant Cloud Type: medium
4%
0.0 In
20:00

S
S

 3 / 6 mph 75 / 77°F 46% 1005 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 06
May		02:00

SE
SE

 3 / 6 mph 65 / 65°F 74% 1012 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
08:00

SSE
SSE

 3 / 6 mph 74 / 77°F 80% 1011 mb
Low level cloud: 7%
Mid level cloud: 27%
High level cloud: 1%
Most Significant Cloud Type: medium
47%
0.0 In
14:00

S
S

 9 / 17 mph 89 / 89°F 32% 1007 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 10%
Most Significant Cloud Type: medium
9%
0.0 In
20:00

SSE
SSE

 4 / 8 mph 70 / 70°F 69% 1008 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.1 In
Tue 07
May		02:00

SSE
SSE

 4 / 8 mph 62 / 62°F 89% 1012 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: medium
79%
0.1 In
08:00

SSE
SSE

 3 / 6 mph 72 / 76°F 76% 1013 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.0 In
14:00

SW
SW

 9 / 20 mph 90 / 90°F 34% 1007 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 4%
Most Significant Cloud Type: medium
22%
0.0 In
20:00

S
S

 6 / 12 mph 70 / 70°F 65% 1008 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Wed 08
May		02:00

S
S

 5 / 11 mph 64 / 64°F 91% 1010 mb
Low level cloud: 23%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
08:00

SSE
SSE

 5 / 11 mph 72 / 77°F 83% 1012 mb
Low level cloud: 10%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: medium
73%
0.1 In
14:00

SSW
SSW

 11 / 24 mph 92 / 91°F 32% 1005 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
20:00

S
S

 9 / 19 mph 69 / 69°F 65% 1006 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: medium
7%
0.0 In
Thu 09
May		02:00

SSE
SSE

 7 / 14 mph 63 / 63°F 91% 1009 mb
Low level cloud: 23%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.0 In
08:00

SSE
SSE

 8 / 17 mph 72 / 76°F 83% 1009 mb
Low level cloud: 8%
Mid level cloud: 18%
High level cloud: 2%
Most Significant Cloud Type: low
14%
0.0 In
14:00

SSW
SSW

 13 / 27 mph 93 / 93°F 29% 1004 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
20:00

S
S

 8 / 16 mph 75 / 78°F 54% 1004 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
Fri 10
May		02:00

S
S

 5 / 11 mph 65 / 65°F 88% 1007 mb
Low level cloud: 6%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
08:00

SSE
SSE

 7 / 14 mph 76 / 79°F 75% 1008 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 11%
Most Significant Cloud Type: medium
15%
0.0 In
14:00

SW
SW

 19 / 41 mph 93 / 92°F 30% 1001 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
20:00

SSW
SSW

 7 / 15 mph 71 / 71°F 60% 1005 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
Sat 11
May		02:00

S
S

 4 / 9 mph 69 / 69°F 69% 1003 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
08:00

S
S

 6 / 12 mph 77 / 80°F 72% 1008 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
14:00

SW
SW

 18 / 38 mph 95 / 95°F 27% 1000 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
20:00

S
S

 6 / 12 mph 74 / 77°F 57% 1006 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: medium
8%
0.0 In
Sun 12
May		02:00

SSW
SSW

 3 / 7 mph 73 / 76°F 52% 1002 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
08:00

NE
NE

 6 / 14 mph 67 / 67°F 77% 1016 mb
Low level cloud: 0%
Mid level cloud: 60%
High level cloud: 2%
Most Significant Cloud Type: medium
59%
0.2 In
14:00

SSW
SSW

 11 / 23 mph 96 / 96°F 28% 1001 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
20:00

E
E

 7 / 15 mph 67 / 67°F 65% 1017 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.0 In

Other Locations Near to Datun

Cities and Towns: Gejiu, China

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