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Holstein 14 Day Long Range Forecast

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

Iowa, United States Of America

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

Over the next 14 days the Holstein forecast suggests the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 24°C expected on the afternoon of Thursday 23rd. The mean minimum temperature will be 11°C, dipping to its lowest on the morning of Saturday 25th at 8°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. The indicators are that Tuesday 21st will have the most precipitation with an accumulation of around 24.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 20
May
00:00

N
N

4 / 7 mph 64 / 64°F 95% 1006 mb
Low level cloud: 28%
Mid level cloud: 11%
High level cloud: 99%
Most Significant Cloud Type: low
43%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
03:00

S
S

5 / 10 mph 62 / 62°F 97% 1006 mb
Low level cloud: 45%
Mid level cloud: 7%
High level cloud: 21%
Most Significant Cloud Type: low
50%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
06:00

S
S

6 / 9 mph 61 / 61°F 96% 1007 mb
Low level cloud: 99%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SW
SW

9 / 11 mph 69 / 67°F 85% 1008 mb
Low level cloud: 83%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

8 / 10 mph 80 / 79°F 62% 1007 mb
Low level cloud: 54%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

5 / 6 mph 81 / 81°F 55% 1006 mb
Low level cloud: 2%
Mid level cloud: 78%
High level cloud: 85%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

9 / 14 mph 75 / 77°F 78% 1006 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

4 / 8 mph 69 / 69°F 83% 1007 mb
Low level cloud: 0%
Mid level cloud: 38%
High level cloud: 19%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
15:00

W
W

21 / 35 mph 65 / 65°F 85% 995 mb
Low level cloud: 93%
Mid level cloud: 55%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

WNW
WNW

20 / 29 mph 53 / 48°F 86% 1001 mb
Low level cloud: 92%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

19 / 28 mph 51 / 45°F 86% 1006 mb
Low level cloud: 96%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

WNW
WNW

14 / 22 mph 49 / 44°F 84% 1008 mb
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 10%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

11 / 18 mph 48 / 44°F 86% 1010 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
06:00

W
W

6 / 12 mph 50 / 47°F 90% 1011 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

8 / 9 mph 62 / 60°F 67% 1012 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
12:00

W
W

8 / 9 mph 69 / 67°F 50% 1011 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

8 / 10 mph 72 / 69°F 46% 1010 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

4 / 7 mph 69 / 66°F 65% 1009 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

9 / 18 mph 60 / 60°F 75% 1010 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

S
S

9 / 18 mph 57 / 56°F 76% 1011 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

11 / 23 mph 56 / 53°F 78% 1010 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

9 / 18 mph 56 / 53°F 84% 1010 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
09:00

SSW
SSW

12 / 15 mph 66 / 65°F 65% 1010 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
12:00

S
S

12 / 14 mph 74 / 76°F 53% 1009 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

13 / 17 mph 76 / 77°F 47% 1007 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
18:00

SSE
SSE

13 / 20 mph 72 / 70°F 63% 1005 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
21:00

SSE
SSE

13 / 22 mph 64 / 64°F 78% 1006 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
Fri 24
May
00:00

ESE
ESE

7 / 13 mph 60 / 60°F 93% 1006 mb
Low level cloud: 18%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: low
34%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

ESE
ESE

10 / 18 mph 60 / 60°F 97% 1004 mb
Low level cloud: 74%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: low
93%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
06:00

W
W

8 / 11 mph 61 / 61°F 96% 1005 mb
Low level cloud: 100%
Mid level cloud: 23%
High level cloud: 35%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

16 / 20 mph 61 / 60°F 73% 1007 mb
Low level cloud: 5%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

13 / 15 mph 65 / 64°F 57% 1008 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

13 / 15 mph 68 / 67°F 55% 1007 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 5%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

10 / 14 mph 64 / 63°F 65% 1008 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

7 / 12 mph 55 / 54°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 98%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May
00:00

N
N

9 / 14 mph 50 / 47°F 80% 1011 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 33%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

7 / 12 mph 48 / 44°F 83% 1010 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 73%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

9 / 13 mph 49 / 45°F 80% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 88%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

9 / 11 mph 54 / 50°F 70% 1012 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 49%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

10 / 12 mph 62 / 60°F 56% 1010 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

8 / 10 mph 62 / 60°F 60% 1009 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

6 / 9 mph 63 / 60°F 67% 1008 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

7 / 14 mph 54 / 52°F 77% 1009 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
May
00:00

ENE
ENE

7 / 15 mph 52 / 49°F 80% 1009 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

7 / 15 mph 50 / 46°F 86% 1008 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
06:00

ENE
ENE

7 / 12 mph 50 / 47°F 88% 1009 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
09:00

NE
NE

9 / 11 mph 61 / 60°F 64% 1008 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
12:00

NE
NE

6 / 8 mph 69 / 67°F 54% 1007 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
15:00

E
E

6 / 7 mph 74 / 76°F 48% 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
18:00

ESE
ESE

7 / 11 mph 72 / 70°F 60% 1005 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
21:00

ESE
ESE

8 / 17 mph 61 / 61°F 85% 1007 mb
Low level cloud: 1%
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
Mon 27
May
00:00

SSW
SSW

13 / 28 mph 59 / 59°F 86% 1009 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
48%
0.0 In
06:00

E
E

7 / 14 mph 53 / 51°F 88% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

ESE
ESE

6 / 12 mph 63 / 63°F 57% 1020 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 97%
Most Significant Cloud Type: medium
47%
0.0 In
18:00

NW
NW

17 / 36 mph 68 / 68°F 91% 1013 mb
Low level cloud: 94%
Mid level cloud: 68%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.0 In
Tue 28
May
00:00

ESE
ESE

8 / 16 mph 62 / 62°F 97% 1016 mb
Low level cloud: 92%
Mid level cloud: 39%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

14 / 29 mph 49 / 44°F 89% 1017 mb
Low level cloud: 80%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

13 / 27 mph 56 / 52°F 68% 1014 mb
Low level cloud: 64%
Mid level cloud: 30%
High level cloud: 17%
Most Significant Cloud Type: low
76%
0.0 In
18:00

NW
NW

18 / 38 mph 53 / 47°F 91% 1015 mb
Low level cloud: 100%
Mid level cloud: 56%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
Wed 29
May
00:00

NW
NW

13 / 27 mph 53 / 49°F 92% 1016 mb
Low level cloud: 88%
Mid level cloud: 32%
High level cloud: 75%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NNW
NNW

17 / 35 mph 54 / 50°F 85% 1016 mb
Low level cloud: 96%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNW
NNW

16 / 34 mph 53 / 49°F 84% 1019 mb
Low level cloud: 45%
Mid level cloud: 56%
High level cloud: 42%
Most Significant Cloud Type: low
69%
0.0 In
18:00

NNW
NNW

12 / 26 mph 65 / 65°F 67% 1016 mb
Low level cloud: 6%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
59%
0.0 In
Thu 30
May
00:00

WNW
WNW

8 / 17 mph 53 / 51°F 90% 1019 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
06:00

NNW
NNW

6 / 12 mph 52 / 51°F 90% 1018 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
12:00

NW
NW

9 / 20 mph 71 / 71°F 54% 1019 mb
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
50%
0.0 In
18:00

NNE
NNE

8 / 17 mph 67 / 67°F 56% 1013 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
Fri 31
May
00:00

SSE
SSE

7 / 15 mph 59 / 60°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 3%
Most Significant Cloud Type: medium
19%
0.0 In
06:00

NNE
NNE

5 / 10 mph 53 / 52°F 79% 1016 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

16 / 34 mph 73 / 77°F 68% 1013 mb
Low level cloud: 74%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: low
95%
0.0 In
18:00

NNE
NNE

4 / 8 mph 70 / 70°F 52% 1014 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 14%
Most Significant Cloud Type: medium
21%
0.0 In
Sat 01
Jun
00:00

SW
SW

9 / 20 mph 66 / 66°F 98% 1007 mb
Low level cloud: 83%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.4 In
06:00

SSW
SSW

5 / 10 mph 55 / 55°F 82% 1017 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
12:00

WNW
WNW

15 / 31 mph 72 / 76°F 60% 1010 mb
Low level cloud: 21%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
18:00

S
S

6 / 12 mph 73 / 77°F 56% 1014 mb
Low level cloud: 0%
Mid level cloud: 33%
High level cloud: 28%
Most Significant Cloud Type: medium
33%
0.0 In
Sun 02
Jun
00:00

WNW
WNW

4 / 9 mph 62 / 62°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
0.0 In
06:00

SE
SE

6 / 13 mph 60 / 60°F 86% 1016 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.0 In
12:00

ESE
ESE

5 / 11 mph 75 / 77°F 55% 1016 mb
Low level cloud: 9%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
18:00

SE
SE

4 / 9 mph 67 / 67°F 74% 1015 mb
Low level cloud: 1%
Mid level cloud: 43%
High level cloud: 22%
Most Significant Cloud Type: medium
45%
0.0 In
Mon 03
Jun
00:00

SSE
SSE

9 / 19 mph 65 / 65°F 83% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 9%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

E
E

7 / 15 mph 61 / 61°F 89% 1017 mb
Low level cloud: 29%
Mid level cloud: 61%
High level cloud: 32%
Most Significant Cloud Type: low
53%
0.0 In
12:00

S
S

19 / 40 mph 77 / 80°F 66% 1013 mb
Low level cloud: 77%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.0 In
18:00

ESE
ESE

4 / 9 mph 70 / 70°F 64% 1018 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 14%
Most Significant Cloud Type: medium
19%
0.0 In
Tue 04
Jun
00:00

S
S

18 / 38 mph 72 / 76°F 87% 1011 mb
Low level cloud: 37%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
06:00

SW
SW

2 / 5 mph 59 / 59°F 86% 1020 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
12:00

SSW
SSW

21 / 43 mph 81 / 85°F 66% 1010 mb
Low level cloud: 59%
Mid level cloud: 10%
High level cloud: 19%
Most Significant Cloud Type: low
64%
0.0 In
18:00

SSE
SSE

6 / 13 mph 75 / 78°F 60% 1016 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
0.0 In

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