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Girthon 14 Day Long Range Forecast

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

Dumfries and Galloway, United Kingdom

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

The next 14 day outlook for Girthon shows the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 20°C expected on the evening of Saturday 18th. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Tuesday 21st at 8°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Current predictions suggest Wednesday 22nd will have the most precipitation with an accumulation of around 36.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 18
May
15:00

NW
NW

5 / 9 mph 62 / 60°F 89% 1016 mb
Low level cloud: 12%
Mid level cloud: 17%
High level cloud: 6%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

5 / 7 mph 68 / 66°F 81% 1016 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 14%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

7 / 14 mph 63 / 60°F 86% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 19%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NNE
NNE

7 / 15 mph 54 / 52°F 90% 1017 mb
Low level cloud: 4%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

6 / 14 mph 52 / 49°F 93% 1016 mb
Low level cloud: 4%
Mid level cloud: 8%
High level cloud: 13%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

5 / 11 mph 54 / 50°F 94% 1017 mb
Low level cloud: 9%
Mid level cloud: 33%
High level cloud: 14%
Most Significant Cloud Type: medium
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

2 / 4 mph 56 / 54°F 89% 1018 mb
Low level cloud: 3%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

5 / 10 mph 54 / 51°F 94% 1018 mb
Low level cloud: 2%
Mid level cloud: 32%
High level cloud: 32%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

7 / 14 mph 55 / 51°F 94% 1017 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 87%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

5 / 9 mph 64 / 61°F 89% 1016 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

4 / 6 mph 64 / 61°F 90% 1017 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 70%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

ENE
ENE

12 / 19 mph 55 / 52°F 91% 1017 mb
Low level cloud: 14%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

13 / 21 mph 53 / 49°F 88% 1017 mb
Low level cloud: 34%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

13 / 21 mph 52 / 47°F 90% 1017 mb
Low level cloud: 54%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

10 / 12 mph 56 / 53°F 88% 1017 mb
Low level cloud: 53%
Mid level cloud: 41%
High level cloud: 9%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

9 / 10 mph 62 / 59°F 82% 1016 mb
Low level cloud: 37%
Mid level cloud: 37%
High level cloud: 86%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

7 / 8 mph 64 / 62°F 79% 1015 mb
Low level cloud: 4%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

9 / 15 mph 61 / 59°F 80% 1014 mb
Low level cloud: 33%
Mid level cloud: 25%
High level cloud: 9%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

10 / 17 mph 58 / 54°F 87% 1014 mb
Low level cloud: 49%
Mid level cloud: 32%
High level cloud: 3%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NE
NE

12 / 14 mph 57 / 54°F 88% 1013 mb
Low level cloud: 18%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

11 / 24 mph 48 / 43°F 84% 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
06:00

NE
NE

11 / 20 mph 48 / 43°F 74% 1012 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

9 / 10 mph 61 / 59°F 65% 1012 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 16%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

6 / 7 mph 65 / 62°F 65% 1011 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 4%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

6 / 6 mph 60 / 58°F 68% 1010 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 97%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

6 / 7 mph 67 / 64°F 81% 1009 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 36%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

6 / 7 mph 62 / 60°F 87% 1010 mb
Low level cloud: 18%
Mid level cloud: 25%
High level cloud: 18%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NW
NW

2 / 3 mph 57 / 58°F 88% 1010 mb
Low level cloud: 35%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

5 / 8 mph 54 / 53°F 87% 1010 mb
Low level cloud: 40%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

6 / 11 mph 55 / 51°F 87% 1010 mb
Low level cloud: 36%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

8 / 13 mph 57 / 55°F 88% 1010 mb
Low level cloud: 62%
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
12:00

NNW
NNW

8 / 9 mph 62 / 60°F 94% 1009 mb
Low level cloud: 30%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
64%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NW
NW

12 / 14 mph 62 / 62°F 95% 1009 mb
Low level cloud: 69%
Mid level cloud: 93%
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

NNW
NNW

18 / 21 mph 61 / 60°F 93% 1008 mb
Low level cloud: 28%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
65%
Expect 0.5 In of precipitation over the past 3 hours.
0.5 In
21:00

NNE
NNE

21 / 28 mph 58 / 53°F 91% 1007 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 87%
Most Significant Cloud Type: low
100%
Expect 0.5 In of precipitation over the past 3 hours.
0.5 In
Thu 23
May
00:00

NE
NE

18 / 36 mph 52 / 47°F 91% 1006 mb
Low level cloud: 94%
Mid level cloud: 69%
High level cloud: 41%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

NE
NE

16 / 33 mph 52 / 47°F 93% 1006 mb
Low level cloud: 98%
Mid level cloud: 92%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

20 / 41 mph 52 / 46°F 94% 1006 mb
Low level cloud: 97%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

23 / 42 mph 52 / 46°F 94% 1007 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

20 / 33 mph 53 / 47°F 95% 1009 mb
Low level cloud: 98%
Mid level cloud: 31%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

11 / 23 mph 54 / 50°F 93% 1011 mb
Low level cloud: 49%
Mid level cloud: 19%
High level cloud: 14%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

9 / 19 mph 53 / 50°F 85% 1011 mb
Low level cloud: 86%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

8 / 16 mph 54 / 50°F 91% 1013 mb
Low level cloud: 50%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
00:00

ENE
ENE

9 / 16 mph 55 / 53°F 94% 1014 mb
Low level cloud: 52%
Mid level cloud: 23%
High level cloud: 6%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

9 / 18 mph 53 / 50°F 95% 1015 mb
Low level cloud: 98%
Mid level cloud: 10%
High level cloud: 0%
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 / 11 mph 52 / 50°F 95% 1016 mb
Low level cloud: 99%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

4 / 5 mph 56 / 55°F 91% 1017 mb
Low level cloud: 94%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

4 / 5 mph 61 / 59°F 79% 1017 mb
Low level cloud: 4%
Mid level cloud: 10%
High level cloud: 12%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

8 / 9 mph 63 / 61°F 76% 1017 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

W
W

10 / 11 mph 61 / 59°F 80% 1017 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

10 / 13 mph 57 / 54°F 85% 1018 mb
Low level cloud: 20%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
May
00:00

NE
NE

21 / 39 mph 53 / 48°F 87% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
0.0 In
06:00

S
S

13 / 20 mph 51 / 47°F 92% 1022 mb
Low level cloud: 82%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

S
S

21 / 42 mph 53 / 47°F 85% 1018 mb
Low level cloud: 35%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
18:00

S
S

9 / 16 mph 55 / 52°F 78% 1018 mb
Low level cloud: 18%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
40%
0.0 In
Sun 26
May
00:00

ENE
ENE

11 / 22 mph 55 / 51°F 88% 1014 mb
Low level cloud: 3%
Mid level cloud: 94%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

SE
SE

14 / 24 mph 53 / 48°F 94% 1017 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

11 / 23 mph 54 / 51°F 89% 1007 mb
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NE
NE

6 / 13 mph 58 / 58°F 76% 1014 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
Mon 27
May
00:00

NNE
NNE

10 / 22 mph 52 / 49°F 91% 1009 mb
Low level cloud: 76%
Mid level cloud: 46%
High level cloud: 27%
Most Significant Cloud Type: low
95%
0.0 In
06:00

NE
NE

14 / 25 mph 53 / 49°F 88% 1013 mb
Low level cloud: 13%
Mid level cloud: 77%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

NW
NW

6 / 13 mph 55 / 54°F 84% 1010 mb
Low level cloud: 79%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NE
NE

15 / 26 mph 57 / 54°F 91% 1012 mb
Low level cloud: 31%
Mid level cloud: 43%
High level cloud: 19%
Most Significant Cloud Type: low
48%
0.1 In
Tue 28
May
00:00

NNE
NNE

11 / 22 mph 53 / 50°F 91% 1012 mb
Low level cloud: 96%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
06:00

NE
NE

16 / 29 mph 53 / 49°F 91% 1012 mb
Low level cloud: 35%
Mid level cloud: 82%
High level cloud: 100%
Most Significant Cloud Type: low
75%
0.1 In
12:00

SE
SE

5 / 11 mph 55 / 54°F 79% 1014 mb
Low level cloud: 10%
Mid level cloud: 44%
High level cloud: 12%
Most Significant Cloud Type: medium
72%
0.0 In
18:00

NE
NE

12 / 21 mph 56 / 54°F 90% 1011 mb
Low level cloud: 45%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: low
87%
0.1 In
Wed 29
May
00:00

SSE
SSE

6 / 14 mph 54 / 52°F 81% 1013 mb
Low level cloud: 0%
Mid level cloud: 82%
High level cloud: 0%
Most Significant Cloud Type: medium
81%
0.0 In
06:00

ENE
ENE

6 / 11 mph 53 / 51°F 90% 1011 mb
Low level cloud: 76%
Mid level cloud: 62%
High level cloud: 28%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SE
SE

17 / 36 mph 56 / 52°F 96% 1008 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
18:00

SSE
SSE

8 / 15 mph 56 / 54°F 92% 1010 mb
Low level cloud: 48%
Mid level cloud: 98%
High level cloud: 77%
Most Significant Cloud Type: low
92%
0.0 In
Thu 30
May
00:00

SSE
SSE

5 / 11 mph 52 / 51°F 97% 1003 mb
Low level cloud: 86%
Mid level cloud: 51%
High level cloud: 86%
Most Significant Cloud Type: low
100%
0.4 In
06:00

S
S

10 / 19 mph 53 / 49°F 92% 1009 mb
Low level cloud: 83%
Mid level cloud: 81%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

12 / 26 mph 53 / 50°F 85% 1005 mb
Low level cloud: 1%
Mid level cloud: 16%
High level cloud: 20%
Most Significant Cloud Type: medium
19%
0.0 In
18:00

SE
SE

5 / 10 mph 55 / 54°F 84% 1006 mb
Low level cloud: 0%
Mid level cloud: 51%
High level cloud: 22%
Most Significant Cloud Type: medium
52%
0.0 In
Fri 31
May
00:00

WSW
WSW

13 / 26 mph 53 / 49°F 89% 1006 mb
Low level cloud: 22%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
06:00

ENE
ENE

11 / 20 mph 52 / 48°F 96% 1002 mb
Low level cloud: 94%
Mid level cloud: 93%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.1 In
12:00

SW
SW

12 / 25 mph 56 / 53°F 85% 1010 mb
Low level cloud: 7%
Mid level cloud: 63%
High level cloud: 33%
Most Significant Cloud Type: medium
84%
0.0 In
18:00

SSW
SSW

3 / 6 mph 56 / 56°F 85% 1002 mb
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 19%
Most Significant Cloud Type: medium
26%
0.1 In
Sat 01
Jun
00:00

S
S

12 / 26 mph 56 / 53°F 93% 1010 mb
Low level cloud: 97%
Mid level cloud: 62%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

6 / 13 mph 52 / 50°F 87% 1003 mb
Low level cloud: 10%
Mid level cloud: 69%
High level cloud: 33%
Most Significant Cloud Type: medium
97%
0.0 In
12:00

ESE
ESE

16 / 34 mph 62 / 62°F 94% 1005 mb
Low level cloud: 100%
Mid level cloud: 93%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.4 In
18:00

SSE
SSE

1 / 1 mph 57 / 57°F 82% 1005 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: medium
12%
0.1 In
Sun 02
Jun
00:00

SE
SE

24 / 51 mph 56 / 50°F 89% 998 mb
Low level cloud: 30%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.2 In
06:00

NNE
NNE

7 / 14 mph 51 / 49°F 89% 1007 mb
Low level cloud: 73%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: low
77%
0.0 In
12:00

SW
SW

17 / 37 mph 60 / 60°F 81% 1008 mb
Low level cloud: 30%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
31%
0.1 In
18:00

NE
NE

4 / 8 mph 56 / 55°F 85% 1010 mb
Low level cloud: 11%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
77%
0.2 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