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Llanfair Kilgeddin 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Llanfair Kilgeddin

Monmouthshire, United Kingdom

Long range weather outlook for Llanfair Kilgeddin includes 14 day forecast summary:

Over the next 14 days the Llanfair Kilgeddin forecast suggests the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 19°C expected on the afternoon of Sunday 19th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Saturday 25th at 7°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The indicators are that Saturday 18th will have the most precipitation with an accumulation of around 13.0mm. On the whole winds are likely to be moderate.

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

NE
NE

 6 / 9 mph 63 / 62°F 88% 1013 mb
Low level cloud: 15%
Mid level cloud: 75%
High level cloud: 16%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

N
N

 6 / 13 mph 58 / 55°F 95% 1014 mb
Low level cloud: 26%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
41%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 19
May		00:00

NNE
NNE

 7 / 14 mph 53 / 50°F 95% 1015 mb
Low level cloud: 13%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 8 / 16 mph 49 / 45°F 93% 1015 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
06:00

N
N

 8 / 16 mph 49 / 44°F 87% 1016 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
09:00

NE
NE

 11 / 13 mph 59 / 55°F 72% 1016 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
12:00

NE
NE

 13 / 15 mph 65 / 63°F 72% 1015 mb
Low level cloud: 31%
Mid level cloud: 9%
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

NE
NE

 12 / 15 mph 67 / 65°F 68% 1014 mb
Low level cloud: 51%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 9 / 13 mph 65 / 64°F 78% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 6 / 10 mph 59 / 57°F 90% 1016 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
Mon 20
May		00:00

NNE
NNE

 7 / 12 mph 51 / 49°F 94% 1016 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
03:00

NNE
NNE

 8 / 14 mph 48 / 44°F 88% 1016 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

NNE
NNE

 7 / 13 mph 48 / 44°F 85% 1016 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

NE
NE

 9 / 10 mph 57 / 54°F 72% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 11 / 13 mph 63 / 61°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 10 / 12 mph 64 / 63°F 68% 1013 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 11 / 13 mph 62 / 60°F 84% 1013 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 6 / 11 mph 56 / 53°F 86% 1013 mb
Low level cloud: 29%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

NE
NE

 5 / 7 mph 53 / 52°F 91% 1012 mb
Low level cloud: 76%
Mid level cloud: 19%
High level cloud: 15%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 5 / 8 mph 51 / 50°F 87% 1011 mb
Low level cloud: 56%
Mid level cloud: 46%
High level cloud: 8%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 5 / 7 mph 52 / 49°F 82% 1011 mb
Low level cloud: 3%
Mid level cloud: 30%
High level cloud: 19%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 5 / 6 mph 57 / 54°F 65% 1011 mb
Low level cloud: 1%
Mid level cloud: 26%
High level cloud: 9%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 4 / 4 mph 64 / 61°F 62% 1010 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
15:00

SSW
SSW

 4 / 4 mph 65 / 62°F 67% 1009 mb
Low level cloud: 20%
Mid level cloud: 21%
High level cloud: 4%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 3 / 4 mph 63 / 60°F 85% 1009 mb
Low level cloud: 28%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 3 / 5 mph 55 / 55°F 90% 1010 mb
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

NW
NW

 3 / 5 mph 54 / 54°F 91% 1009 mb
Low level cloud: 24%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 4 / 7 mph 53 / 52°F 90% 1009 mb
Low level cloud: 4%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 5 / 8 mph 55 / 52°F 89% 1009 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 4 / 5 mph 62 / 60°F 77% 1009 mb
Low level cloud: 2%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 8 / 10 mph 64 / 62°F 72% 1008 mb
Low level cloud: 24%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

 11 / 13 mph 64 / 62°F 75% 1008 mb
Low level cloud: 24%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

 9 / 13 mph 60 / 57°F 86% 1008 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 5 / 9 mph 54 / 51°F 92% 1009 mb
Low level cloud: 2%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		00:00

W
W

 5 / 10 mph 50 / 48°F 93% 1009 mb
Low level cloud: 12%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 4 / 9 mph 48 / 47°F 95% 1009 mb
Low level cloud: 25%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 5 / 8 mph 53 / 51°F 96% 1009 mb
Low level cloud: 57%
Mid level cloud: 64%
High level cloud: 97%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 10 / 11 mph 58 / 55°F 87% 1009 mb
Low level cloud: 46%
Mid level cloud: 64%
High level cloud: 38%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 15 / 18 mph 63 / 61°F 77% 1009 mb
Low level cloud: 36%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 15 / 17 mph 63 / 62°F 76% 1009 mb
Low level cloud: 30%
Mid level cloud: 24%
High level cloud: 6%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 13 / 15 mph 58 / 55°F 85% 1011 mb
Low level cloud: 56%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 4 / 8 mph 52 / 49°F 95% 1012 mb
Low level cloud: 55%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May		00:00

SSW
SSW

 3 / 6 mph 51 / 50°F 94% 1013 mb
Low level cloud: 66%
Mid level cloud: 5%
High level cloud: 12%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 6 / 10 mph 50 / 47°F 95% 1014 mb
Low level cloud: 37%
Mid level cloud: 16%
High level cloud: 53%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 5 / 6 mph 54 / 51°F 92% 1015 mb
Low level cloud: 44%
Mid level cloud: 46%
High level cloud: 87%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 7 / 8 mph 58 / 56°F 83% 1016 mb
Low level cloud: 68%
Mid level cloud: 28%
High level cloud: 94%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 9 / 12 mph 63 / 61°F 74% 1016 mb
Low level cloud: 26%
Mid level cloud: 43%
High level cloud: 8%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 9 / 11 mph 65 / 63°F 67% 1017 mb
Low level cloud: 10%
Mid level cloud: 17%
High level cloud: 94%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 7 / 9 mph 62 / 60°F 80% 1018 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 9%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 3 / 6 mph 52 / 50°F 88% 1019 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
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

NNE
NNE

 11 / 21 mph 54 / 51°F 96% 1019 mb
Low level cloud: 94%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
06:00

W
W

 4 / 8 mph 56 / 56°F 86% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
12:00

SSW
SSW

 10 / 21 mph 57 / 54°F 69% 1021 mb
Low level cloud: 34%
Mid level cloud: 46%
High level cloud: 76%
Most Significant Cloud Type: low
59%
0.0 In
18:00

S
S

 11 / 23 mph 62 / 62°F 82% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
0.0 In
Sun 26
May		00:00

ESE
ESE

 5 / 10 mph 56 / 55°F 99% 1014 mb
Low level cloud: 99%
Mid level cloud: 93%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ESE
ESE

 4 / 8 mph 54 / 53°F 97% 1018 mb
Low level cloud: 51%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
93%
0.0 In
12:00

WSW
WSW

 11 / 22 mph 60 / 60°F 76% 1006 mb
Low level cloud: 39%
Mid level cloud: 100%
High level cloud: 93%
Most Significant Cloud Type: low
84%
0.0 In
18:00

E
E

 6 / 14 mph 60 / 60°F 98% 1011 mb
Low level cloud: 94%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Mon 27
May		00:00

SW
SW

 5 / 11 mph 49 / 46°F 96% 1016 mb
Low level cloud: 52%
Mid level cloud: 9%
High level cloud: 95%
Most Significant Cloud Type: low
66%
0.0 In
06:00

W
W

 0 / 1 mph 56 / 56°F 94% 1011 mb
Low level cloud: 53%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: low
97%
0.3 In
12:00

SSW
SSW

 15 / 32 mph 62 / 62°F 72% 1014 mb
Low level cloud: 67%
Mid level cloud: 45%
High level cloud: 7%
Most Significant Cloud Type: low
83%
0.0 In
18:00

SW
SW

 3 / 6 mph 58 / 58°F 91% 1009 mb
Low level cloud: 57%
Mid level cloud: 70%
High level cloud: 88%
Most Significant Cloud Type: low
91%
0.1 In
Tue 28
May		00:00

WSW
WSW

 19 / 39 mph 54 / 49°F 89% 1011 mb
Low level cloud: 79%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.1 In
06:00

WNW
WNW

 4 / 8 mph 51 / 50°F 96% 1010 mb
Low level cloud: 72%
Mid level cloud: 78%
High level cloud: 94%
Most Significant Cloud Type: low
100%
0.1 In
12:00

WSW
WSW

 17 / 37 mph 60 / 60°F 68% 1012 mb
Low level cloud: 4%
Mid level cloud: 45%
High level cloud: 95%
Most Significant Cloud Type: medium
60%
0.0 In
18:00

WSW
WSW

 6 / 12 mph 58 / 57°F 89% 1010 mb
Low level cloud: 49%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
69%
0.2 In
Wed 29
May		00:00

WSW
WSW

 16 / 33 mph 55 / 51°F 97% 1007 mb
Low level cloud: 94%
Mid level cloud: 25%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.2 In
06:00

WSW
WSW

 4 / 8 mph 56 / 56°F 93% 1012 mb
Low level cloud: 73%
Mid level cloud: 46%
High level cloud: 37%
Most Significant Cloud Type: low
93%
0.0 In
12:00

WSW
WSW

 18 / 37 mph 60 / 60°F 69% 1012 mb
Low level cloud: 1%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
18:00

SW
SW

 8 / 16 mph 59 / 57°F 92% 1012 mb
Low level cloud: 69%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.0 In
Thu 30
May		00:00

WSW
WSW

 7 / 14 mph 51 / 48°F 94% 1014 mb
Low level cloud: 42%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
06:00

S
S

 3 / 7 mph 55 / 55°F 94% 1011 mb
Low level cloud: 64%
Mid level cloud: 44%
High level cloud: 35%
Most Significant Cloud Type: low
83%
0.1 In
12:00

WSW
WSW

 5 / 10 mph 65 / 65°F 61% 1017 mb
Low level cloud: 41%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: low
50%
0.0 In
18:00

S
S

 5 / 11 mph 59 / 59°F 93% 1006 mb
Low level cloud: 47%
Mid level cloud: 85%
High level cloud: 33%
Most Significant Cloud Type: low
81%
0.1 In
Fri 31
May		00:00

NW
NW

 4 / 8 mph 51 / 51°F 88% 1019 mb
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 30%
Most Significant Cloud Type: medium
60%
0.0 In
06:00

S
S

 7 / 15 mph 53 / 51°F 94% 1003 mb
Low level cloud: 88%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
12:00

SW
SW

 3 / 6 mph 60 / 60°F 76% 1019 mb
Low level cloud: 0%
Mid level cloud: 76%
High level cloud: 44%
Most Significant Cloud Type: medium
77%
0.0 In
18:00

SSW
SSW

 13 / 27 mph 59 / 59°F 89% 1003 mb
Low level cloud: 28%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: low
45%
0.2 In
Sat 01
Jun		00:00

SE
SE

 4 / 8 mph 51 / 50°F 96% 1017 mb
Low level cloud: 99%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SSE
SSE

 5 / 11 mph 54 / 53°F 96% 1003 mb
Low level cloud: 83%
Mid level cloud: 12%
High level cloud: 20%
Most Significant Cloud Type: low
89%
0.1 In
12:00

SW
SW

 6 / 12 mph 62 / 62°F 97% 1015 mb
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SW
SW

 7 / 15 mph 56 / 55°F 90% 1006 mb
Low level cloud: 83%
Mid level cloud: 55%
High level cloud: 10%
Most Significant Cloud Type: low
100%
0.1 In
Sun 02
Jun		00:00

SSE
SSE

 3 / 6 mph 60 / 60°F 99% 1010 mb
Low level cloud: 92%
Mid level cloud: 43%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSE
SSE

 5 / 11 mph 55 / 54°F 98% 1008 mb
Low level cloud: 92%
Mid level cloud: 100%
High level cloud: 84%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 21 / 44 mph 64 / 64°F 81% 1005 mb
Low level cloud: 75%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
88%
0.1 In
18:00

WSW
WSW

 11 / 24 mph 58 / 56°F 87% 1010 mb
Low level cloud: 18%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
36%
0.1 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