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Mason City 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Mason City

Illinois, United States Of America

Long range weather outlook for Mason City includes 14 day forecast summary:

The forecast for Mason City in the coming two weeks is predicting the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 28°C expected on the afternoon of Wednesday 22nd. The mean minimum temperature will be 16°C, dipping to its lowest on the morning of Wednesday 15th at 11°C. The next 14 days will have some days seeing a little precipitation and some days with rain. The current forecast indicates Saturday 18th will have the most precipitation with an accumulation of around 14.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 14
May		00:00

SE
SE

 10 / 16 mph 60 / 60°F 93% 1007 mb
Low level cloud: 37%
Mid level cloud: 42%
High level cloud: 98%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 9 / 13 mph 60 / 60°F 96% 1006 mb
Low level cloud: 99%
Mid level cloud: 17%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 6 / 9 mph 61 / 61°F 95% 1006 mb
Low level cloud: 96%
Mid level cloud: 70%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 9 / 13 mph 62 / 62°F 93% 1007 mb
Low level cloud: 96%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

ENE
ENE

 9 / 11 mph 64 / 64°F 88% 1006 mb
Low level cloud: 74%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 11 / 15 mph 66 / 64°F 88% 1005 mb
Low level cloud: 32%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 11 / 17 mph 66 / 65°F 82% 1005 mb
Low level cloud: 16%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 13 / 21 mph 60 / 60°F 89% 1007 mb
Low level cloud: 35%
Mid level cloud: 46%
High level cloud: 37%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 15
May		15:00

ENE
ENE

 6 / 8 mph 78 / 77°F 55% 1009 mb
Low level cloud: 55%
Mid level cloud: 11%
High level cloud: 13%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 5 / 8 mph 74 / 76°F 70% 1010 mb
Low level cloud: 47%
Mid level cloud: 20%
High level cloud: 32%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 4 / 8 mph 65 / 65°F 78% 1011 mb
Low level cloud: 41%
Mid level cloud: 14%
High level cloud: 20%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May		00:00

ESE
ESE

 6 / 11 mph 62 / 62°F 81% 1011 mb
Low level cloud: 38%
Mid level cloud: 6%
High level cloud: 7%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 6 / 12 mph 60 / 60°F 88% 1011 mb
Low level cloud: 1%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 7 / 11 mph 63 / 61°F 90% 1010 mb
Low level cloud: 5%
Mid level cloud: 29%
High level cloud: 99%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 9 / 12 mph 66 / 65°F 77% 1011 mb
Low level cloud: 26%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 8 / 11 mph 62 / 62°F 90% 1011 mb
Low level cloud: 90%
Mid level cloud: 97%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 9 / 12 mph 65 / 62°F 91% 1009 mb
Low level cloud: 34%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 2 / 3 mph 70 / 67°F 81% 1009 mb
Low level cloud: 60%
Mid level cloud: 8%
High level cloud: 10%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 4 / 7 mph 61 / 62°F 92% 1010 mb
Low level cloud: 36%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May		00:00

E
E

 6 / 9 mph 62 / 62°F 94% 1009 mb
Low level cloud: 16%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: medium
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

 5 / 8 mph 60 / 60°F 96% 1008 mb
Low level cloud: 37%
Mid level cloud: 26%
High level cloud: 92%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 4 / 9 mph 61 / 59°F 94% 1009 mb
Low level cloud: 43%
Mid level cloud: 42%
High level cloud: 95%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

 8 / 16 mph 64 / 62°F 83% 1008 mb
Low level cloud: 36%
Mid level cloud: 54%
High level cloud: 100%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 10 / 14 mph 66 / 65°F 93% 1008 mb
Low level cloud: 67%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
94%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

ESE
ESE

 10 / 11 mph 67 / 67°F 96% 1006 mb
Low level cloud: 74%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
18:00

ESE
ESE

 11 / 13 mph 66 / 65°F 95% 1005 mb
Low level cloud: 98%
Mid level cloud: 44%
High level cloud: 55%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

ESE
ESE

 15 / 23 mph 63 / 63°F 94% 1005 mb
Low level cloud: 99%
Mid level cloud: 45%
High level cloud: 37%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

E
E

 13 / 21 mph 62 / 62°F 94% 1004 mb
Low level cloud: 96%
Mid level cloud: 77%
High level cloud: 81%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 15 / 26 mph 61 / 61°F 94% 1002 mb
Low level cloud: 100%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

ENE
ENE

 12 / 20 mph 61 / 61°F 97% 1003 mb
Low level cloud: 100%
Mid level cloud: 83%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
09:00

ENE
ENE

 12 / 17 mph 63 / 62°F 97% 1003 mb
Low level cloud: 98%
Mid level cloud: 58%
High level cloud: 79%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

NE
NE

 11 / 16 mph 64 / 64°F 94% 1003 mb
Low level cloud: 100%
Mid level cloud: 76%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NNE
NNE

 11 / 14 mph 65 / 65°F 96% 1004 mb
Low level cloud: 100%
Mid level cloud: 82%
High level cloud: 77%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 11 / 16 mph 64 / 64°F 95% 1005 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 10 / 17 mph 63 / 63°F 95% 1007 mb
Low level cloud: 77%
Mid level cloud: 45%
High level cloud: 33%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

NNW
NNW

 8 / 14 mph 61 / 61°F 97% 1008 mb
Low level cloud: 69%
Mid level cloud: 26%
High level cloud: 3%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 8 / 15 mph 60 / 60°F 97% 1009 mb
Low level cloud: 55%
Mid level cloud: 37%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 9 / 13 mph 64 / 61°F 95% 1010 mb
Low level cloud: 59%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 16 / 19 mph 69 / 68°F 78% 1011 mb
Low level cloud: 87%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 14 / 18 mph 68 / 67°F 78% 1012 mb
Low level cloud: 63%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

 11 / 14 mph 74 / 76°F 67% 1012 mb
Low level cloud: 65%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 9 / 15 mph 71 / 69°F 72% 1012 mb
Low level cloud: 10%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 7 / 14 mph 61 / 61°F 88% 1013 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 20
May		00:00

NNW
NNW

 6 / 12 mph 59 / 58°F 92% 1013 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
03:00

NNW
NNW

 6 / 11 mph 57 / 56°F 93% 1014 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 5 / 9 mph 59 / 58°F 90% 1014 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 5 / 6 mph 71 / 68°F 71% 1014 mb
Low level cloud: 31%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 1 / 1 mph 79 / 78°F 54% 1013 mb
Low level cloud: 33%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 1 / 2 mph 80 / 79°F 48% 1012 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 2 / 2 mph 80 / 79°F 60% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 3 / 4 mph 71 / 71°F 71% 1012 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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 21
May		00:00

ESE
ESE

 13 / 27 mph 57 / 54°F 70% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: medium
4%
0.0 In
06:00

NW
NW

 8 / 17 mph 43 / 38°F 80% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
19%
0.0 In
18:00

ENE
ENE

 17 / 36 mph 68 / 69°F 72% 1009 mb
Low level cloud: 14%
Mid level cloud: 24%
High level cloud: 35%
Most Significant Cloud Type: low
26%
0.0 In
Wed 22
May		00:00

ENE
ENE

 5 / 10 mph 68 / 68°F 93% 1002 mb
Low level cloud: 18%
Mid level cloud: 28%
High level cloud: 7%
Most Significant Cloud Type: low
28%
0.0 In
06:00

NNE
NNE

 6 / 14 mph 63 / 63°F 92% 1010 mb
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
12:00

WSW
WSW

 11 / 24 mph 85 / 88°F 54% 1004 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 8%
Most Significant Cloud Type: medium
5%
0.0 In
18:00

WNW
WNW

 6 / 12 mph 78 / 82°F 72% 1010 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: medium
8%
0.0 In
Thu 23
May		00:00

WSW
WSW

 3 / 6 mph 67 / 67°F 92% 1003 mb
Low level cloud: 9%
Mid level cloud: 14%
High level cloud: 14%
Most Significant Cloud Type: low
15%
1.9 In
06:00

SSW
SSW

 2 / 5 mph 66 / 66°F 90% 1012 mb
Low level cloud: 6%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
63%
0.0 In
12:00

NW
NW

 13 / 27 mph 66 / 66°F 71% 1008 mb
Low level cloud: 69%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
69%
0.0 In
18:00

SE
SE

 4 / 9 mph 76 / 79°F 79% 1006 mb
Low level cloud: 10%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.3 In
Fri 24
May		00:00

NE
NE

 7 / 15 mph 59 / 59°F 79% 1010 mb
Low level cloud: 54%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: low
54%
0.0 In
06:00

SSW
SSW

 8 / 17 mph 65 / 65°F 92% 1004 mb
Low level cloud: 36%
Mid level cloud: 46%
High level cloud: 74%
Most Significant Cloud Type: low
61%
0.4 In
12:00

NE
NE

 11 / 23 mph 59 / 56°F 76% 1012 mb
Low level cloud: 95%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NW
NW

 6 / 13 mph 75 / 79°F 79% 1006 mb
Low level cloud: 45%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
46%
0.1 In
Sat 25
May		00:00

NNE
NNE

 9 / 18 mph 54 / 51°F 76% 1014 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
0.0 In
06:00

NNE
NNE

 4 / 9 mph 66 / 65°F 91% 1010 mb
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
12:00

N
N

 6 / 13 mph 65 / 65°F 43% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NNW
NNW

 6 / 14 mph 67 / 67°F 95% 1007 mb
Low level cloud: 52%
Mid level cloud: 20%
High level cloud: 95%
Most Significant Cloud Type: low
70%
1.3 In
Sun 26
May		00:00

SSW
SSW

 6 / 12 mph 55 / 53°F 64% 1017 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: medium
44%
0.0 In
06:00

N
N

 8 / 16 mph 57 / 55°F 88% 1014 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: medium
13%
0.0 In
12:00

WNW
WNW

 6 / 12 mph 62 / 62°F 74% 1019 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
18:00

NNE
NNE

 5 / 11 mph 67 / 67°F 70% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 99%
Most Significant Cloud Type: high
98%
0.0 In
Mon 27
May		00:00

SE
SE

 6 / 12 mph 58 / 58°F 74% 1018 mb
Low level cloud: 16%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
35%
0.0 In
06:00

E
E

 6 / 13 mph 54 / 53°F 84% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

S
S

 15 / 30 mph 72 / 76°F 66% 1015 mb
Low level cloud: 51%
Mid level cloud: 31%
High level cloud: 34%
Most Significant Cloud Type: low
65%
0.0 In
18:00

ESE
ESE

 7 / 14 mph 69 / 69°F 70% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Tue 28
May		00:00

SE
SE

 13 / 27 mph 61 / 61°F 95% 1011 mb
Low level cloud: 69%
Mid level cloud: 15%
High level cloud: 32%
Most Significant Cloud Type: low
78%
0.0 In
06:00

ESE
ESE

 11 / 24 mph 59 / 56°F 89% 1010 mb
Low level cloud: 14%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

SSE
SSE

 14 / 29 mph 70 / 70°F 90% 1005 mb
Low level cloud: 99%
Mid level cloud: 34%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.5 In
18:00

WNW
WNW

 21 / 44 mph 66 / 66°F 90% 1005 mb
Low level cloud: 100%
Mid level cloud: 71%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.4 In
Wed 29
May		00:00

W
W

 9 / 19 mph 62 / 62°F 88% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.2 In
06:00

NW
NW

 20 / 43 mph 57 / 52°F 85% 1008 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

 20 / 43 mph 74 / 77°F 59% 1012 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.0 In
18:00

NNW
NNW

 13 / 26 mph 65 / 65°F 78% 1012 mb
Low level cloud: 26%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.1 In

Other Locations Near to Mason City

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