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Local Weather

Manchester 14 Day Long Range Forecast

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

New Hampshire, United States Of America

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

For Manchester in the coming two weeks the average daytime maximum temperature will be around 25°C, with a high for the two weeks of 31°C expected on the afternoon of Saturday 14th. The mean minimum temperature will be 14°C, dipping to its lowest on the morning of Saturday 14th at 10°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. Current predictions suggest Friday 6th will have the most precipitation with an accumulation of around 55.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 06
Jun
16:00

ESE
ESE

9 / 15 mph 69 / 68°F 98% 1009 mb
Low level cloud: 59%
Mid level cloud: 43%
High level cloud: 97%
Most Significant Cloud Type: low
85%
Expect 0.4 In of precipitation over the past 3 hours.
0.4 In
19:00

SW
SW

4 / 6 mph 66 / 64°F 99% 1012 mb
Low level cloud: 54%
Mid level cloud: 54%
High level cloud: 96%
Most Significant Cloud Type: low
84%
Expect 1.5 In of precipitation over the past 3 hours.
1.5 In
22:00

SW
SW

3 / 7 mph 64 / 64°F 97% 1010 mb
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 41%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 07
Jun
01:00

SSW
SSW

4 / 7 mph 63 / 63°F 98% 1010 mb
Low level cloud: 28%
Mid level cloud: 26%
High level cloud: 31%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

2 / 5 mph 62 / 62°F 97% 1010 mb
Low level cloud: 14%
Mid level cloud: 61%
High level cloud: 18%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

4 / 5 mph 65 / 63°F 98% 1010 mb
Low level cloud: 57%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

3 / 3 mph 67 / 67°F 91% 1010 mb
Low level cloud: 80%
Mid level cloud: 54%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

4 / 5 mph 64 / 64°F 98% 1008 mb
Low level cloud: 59%
Mid level cloud: 86%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
16:00

NE
NE

4 / 5 mph 63 / 63°F 99% 1008 mb
Low level cloud: 70%
Mid level cloud: 54%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
19:00

N
N

4 / 6 mph 62 / 62°F 98% 1009 mb
Low level cloud: 97%
Mid level cloud: 73%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

2 / 4 mph 58 / 59°F 98% 1009 mb
Low level cloud: 31%
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
Sun 08
Jun
01:00

NW
NW

4 / 7 mph 56 / 56°F 97% 1009 mb
Low level cloud: 7%
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
04:00

NW
NW

4 / 9 mph 54 / 54°F 97% 1011 mb
Low level cloud: 2%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

4 / 4 mph 65 / 62°F 86% 1013 mb
Low level cloud: 7%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

5 / 6 mph 76 / 76°F 50% 1013 mb
Low level cloud: 27%
Mid level cloud: 9%
High level cloud: 30%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

7 / 8 mph 80 / 77°F 41% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

9 / 11 mph 73 / 76°F 54% 1013 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 1%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

5 / 8 mph 64 / 61°F 77% 1015 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

4 / 6 mph 57 / 57°F 91% 1015 mb
Low level cloud: 19%
Mid level cloud: 18%
High level cloud: 88%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 09
Jun
01:00

ENE
ENE

3 / 5 mph 54 / 54°F 99% 1016 mb
Low level cloud: 94%
Mid level cloud: 43%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

4 / 6 mph 54 / 54°F 96% 1015 mb
Low level cloud: 87%
Mid level cloud: 25%
High level cloud: 12%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

E
E

5 / 6 mph 57 / 55°F 91% 1015 mb
Low level cloud: 70%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

4 / 5 mph 69 / 68°F 63% 1016 mb
Low level cloud: 88%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

7 / 8 mph 74 / 76°F 61% 1013 mb
Low level cloud: 31%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

8 / 9 mph 74 / 76°F 61% 1013 mb
Low level cloud: 35%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

7 / 10 mph 64 / 61°F 85% 1014 mb
Low level cloud: 67%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

3 / 4 mph 57 / 58°F 93% 1015 mb
Low level cloud: 66%
Mid level cloud: 18%
High level cloud: 6%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 10
Jun
01:00

S
S

3 / 6 mph 54 / 54°F 99% 1014 mb
Low level cloud: 81%
Mid level cloud: 12%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

3 / 5 mph 55 / 55°F 99% 1014 mb
Low level cloud: 99%
Mid level cloud: 16%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

5 / 6 mph 61 / 61°F 93% 1015 mb
Low level cloud: 98%
Mid level cloud: 13%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

6 / 7 mph 65 / 65°F 85% 1014 mb
Low level cloud: 99%
Mid level cloud: 23%
High level cloud: 45%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

6 / 8 mph 67 / 66°F 93% 1011 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 59%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

7 / 10 mph 64 / 64°F 99% 1009 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SSE
SSE

2 / 4 mph 63 / 63°F 99% 1009 mb
Low level cloud: 99%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

3 / 5 mph 63 / 63°F 99% 1009 mb
Low level cloud: 93%
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
Wed 11
Jun
01:00

WSW
WSW

3 / 5 mph 63 / 63°F 99% 1009 mb
Low level cloud: 84%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

3 / 7 mph 60 / 60°F 98% 1009 mb
Low level cloud: 43%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

9 / 12 mph 68 / 66°F 92% 1010 mb
Low level cloud: 63%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

13 / 14 mph 76 / 77°F 44% 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
13:00

WNW
WNW

12 / 13 mph 82 / 80°F 41% 1010 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
16:00

WNW
WNW

10 / 11 mph 81 / 80°F 46% 1011 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

5 / 11 mph 70 / 67°F 74% 1013 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

6 / 12 mph 64 / 64°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 12
Jun
01:00

W
W

4 / 9 mph 61 / 61°F 84% 1014 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

4 / 9 mph 58 / 58°F 83% 1014 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
07:00

WNW
WNW

6 / 7 mph 72 / 69°F 64% 1015 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

9 / 11 mph 82 / 80°F 38% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

9 / 11 mph 86 / 83°F 30% 1012 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 4%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

11 / 13 mph 85 / 83°F 40% 1010 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 9%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

11 / 20 mph 75 / 76°F 56% 1011 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 34%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

9 / 13 mph 71 / 71°F 63% 1012 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 36%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 13
Jun
01:00

WNW
WNW

4 / 9 mph 69 / 69°F 82% 1016 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: medium
12%
0.0 In
07:00

NW
NW

5 / 10 mph 76 / 78°F 62% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
13:00

WSW
WSW

8 / 17 mph 90 / 90°F 35% 1015 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 3%
Most Significant Cloud Type: medium
17%
0.0 In
19:00

SW
SW

8 / 17 mph 73 / 77°F 73% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 96%
Most Significant Cloud Type: medium
49%
0.0 In
Sat 14
Jun
01:00

SSW
SSW

2 / 4 mph 66 / 66°F 82% 1012 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 56%
Most Significant Cloud Type: medium
31%
0.0 In
07:00

WNW
WNW

7 / 14 mph 69 / 69°F 59% 1017 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 12%
Most Significant Cloud Type: medium
24%
0.0 In
13:00

NW
NW

7 / 14 mph 81 / 80°F 36% 1019 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 21%
Most Significant Cloud Type: medium
26%
0.0 In
19:00

W
W

7 / 15 mph 77 / 80°F 67% 1010 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
Sun 15
Jun
01:00

NNE
NNE

3 / 7 mph 65 / 65°F 72% 1021 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
07:00

WNW
WNW

7 / 15 mph 78 / 81°F 69% 1013 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
13:00

S
S

6 / 12 mph 80 / 82°F 61% 1021 mb
Low level cloud: 92%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.0 In
19:00

E
E

5 / 11 mph 59 / 59°F 82% 1019 mb
Low level cloud: 84%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Mon 16
Jun
01:00

S
S

5 / 11 mph 64 / 64°F 96% 1021 mb
Low level cloud: 38%
Mid level cloud: 43%
High level cloud: 98%
Most Significant Cloud Type: low
64%
0.1 In
07:00

ENE
ENE

6 / 13 mph 55 / 53°F 88% 1019 mb
Low level cloud: 96%
Mid level cloud: 83%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SW
SW

10 / 20 mph 86 / 90°F 54% 1014 mb
Low level cloud: 66%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
94%
0.0 In
19:00

ENE
ENE

5 / 11 mph 60 / 60°F 98% 1018 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 72%
Most Significant Cloud Type: low
100%
0.2 In
Tue 17
Jun
01:00

SSW
SSW

7 / 15 mph 71 / 71°F 99% 1011 mb
Low level cloud: 78%
Mid level cloud: 91%
High level cloud: 73%
Most Significant Cloud Type: low
100%
0.4 In
07:00

NNE
NNE

5 / 10 mph 54 / 53°F 99% 1015 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 34%
Most Significant Cloud Type: low
100%
0.3 In
13:00

W
W

6 / 13 mph 90 / 95°F 50% 1007 mb
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.2 In
19:00

NE
NE

3 / 5 mph 58 / 60°F 92% 1010 mb
Low level cloud: 95%
Mid level cloud: 15%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.1 In
Wed 18
Jun
01:00

SW
SW

5 / 10 mph 75 / 80°F 94% 1001 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: medium
9%
0.0 In
07:00

W
W

7 / 15 mph 68 / 68°F 91% 1006 mb
Low level cloud: 23%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
13:00

WNW
WNW

14 / 30 mph 69 / 69°F 62% 1002 mb
Low level cloud: 71%
Mid level cloud: 58%
High level cloud: 2%
Most Significant Cloud Type: low
91%
0.0 In
19:00

W
W

8 / 16 mph 70 / 70°F 77% 1006 mb
Low level cloud: 54%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
Thu 19
Jun
01:00

WNW
WNW

8 / 16 mph 62 / 62°F 80% 1000 mb
Low level cloud: 15%
Mid level cloud: 67%
High level cloud: 28%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

W
W

7 / 15 mph 72 / 72°F 71% 1006 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.0 In
13:00

NNE
NNE

6 / 12 mph 67 / 67°F 83% 1002 mb
Low level cloud: 88%
Mid level cloud: 58%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.3 In
19:00

E
E

7 / 15 mph 68 / 68°F 77% 1007 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
Fri 20
Jun
01:00

NW
NW

4 / 9 mph 60 / 60°F 92% 1006 mb
Low level cloud: 93%
Mid level cloud: 71%
High level cloud: 50%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WSW
WSW

1 / 2 mph 68 / 68°F 78% 1011 mb
Low level cloud: 38%
Mid level cloud: 6%
High level cloud: 97%
Most Significant Cloud Type: low
51%
0.0 In
13:00

NNE
NNE

4 / 10 mph 61 / 61°F 92% 1006 mb
Low level cloud: 92%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.0 In
19:00

SSE
SSE

6 / 13 mph 70 / 70°F 79% 1009 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
Sat 21
Jun
01:00

E
E

2 / 5 mph 58 / 60°F 98% 1005 mb
Low level cloud: 80%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.0 In
07:00

SSW
SSW

5 / 10 mph 73 / 77°F 72% 1009 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 41%
Most Significant Cloud Type: medium
7%
0.0 In
13:00

E
E

5 / 11 mph 67 / 67°F 82% 1004 mb
Low level cloud: 86%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
19:00

SSW
SSW

10 / 22 mph 73 / 77°F 78% 1008 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 15%
Most Significant Cloud Type: medium
9%
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