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Ayer 14 Day Long Range Forecast

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

Massachusetts, United States Of America

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

For Ayer in the coming two weeks the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 21°C expected on the afternoon of Thursday 24th. The average minimum temperature will be 6°C, dipping to its lowest on the morning of Monday 21st at 2°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The current forecast indicates Friday 25th will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 19
Apr		01:00

SSW
SSW

 10 / 18 mph 55 / 52°F 75% 1015 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 33%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 10 / 16 mph 55 / 53°F 78% 1013 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 96%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 9 / 12 mph 62 / 60°F 76% 1013 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 93%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 12 / 13 mph 75 / 77°F 53% 1010 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 20%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 11 / 16 mph 75 / 77°F 69% 1010 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 45%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 12 / 15 mph 80 / 80°F 57% 1009 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 8%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 8 / 16 mph 68 / 67°F 88% 1010 mb
Low level cloud: 63%
Mid level cloud: 74%
High level cloud: 32%
Most Significant Cloud Type: low
92%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

W
W

 13 / 23 mph 65 / 65°F 82% 1012 mb
Low level cloud: 31%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
Sun 20
Apr		19:00

NNW
NNW

 9 / 13 mph 50 / 45°F 44% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: high
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 8 / 9 mph 48 / 44°F 50% 1028 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 21
Apr		01:00

NW
NW

 5 / 9 mph 40 / 37°F 53% 1027 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
04:00

WNW
WNW

 5 / 10 mph 36 / 32°F 62% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 3 / 3 mph 45 / 44°F 44% 1028 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 3 / 3 mph 59 / 58°F 27% 1026 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 15%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 6 / 7 mph 66 / 64°F 25% 1022 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 95%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 6 / 8 mph 66 / 64°F 38% 1020 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 50%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 8 / 11 mph 52 / 49°F 55% 1021 mb
Low level cloud: 18%
Mid level cloud: 94%
High level cloud: 75%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 9 / 12 mph 49 / 45°F 56% 1019 mb
Low level cloud: 88%
Mid level cloud: 39%
High level cloud: 53%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 22
Apr		01:00

SSW
SSW

 7 / 10 mph 46 / 43°F 83% 1017 mb
Low level cloud: 97%
Mid level cloud: 55%
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

S
S

 6 / 9 mph 47 / 45°F 94% 1015 mb
Low level cloud: 100%
Mid level cloud: 41%
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

SSW
SSW

 5 / 7 mph 50 / 48°F 96% 1013 mb
Low level cloud: 99%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 8 / 10 mph 60 / 59°F 83% 1012 mb
Low level cloud: 89%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 10 / 12 mph 67 / 66°F 58% 1010 mb
Low level cloud: 68%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 14 / 16 mph 65 / 64°F 52% 1011 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 12 / 17 mph 52 / 48°F 62% 1015 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 9 / 12 mph 47 / 42°F 73% 1017 mb
Low level cloud: 6%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 23
Apr		01:00

WNW
WNW

 7 / 10 mph 44 / 40°F 78% 1017 mb
Low level cloud: 21%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 6 / 9 mph 43 / 39°F 83% 1018 mb
Low level cloud: 3%
Mid level cloud: 1%
High level cloud: 12%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 6 / 8 mph 50 / 46°F 68% 1020 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 6 / 7 mph 60 / 58°F 50% 1020 mb
Low level cloud: 87%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 6 / 7 mph 66 / 64°F 44% 1019 mb
Low level cloud: 19%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 8 / 10 mph 66 / 64°F 44% 1020 mb
Low level cloud: 6%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 7 / 11 mph 53 / 49°F 69% 1023 mb
Low level cloud: 17%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 4 / 6 mph 46 / 44°F 78% 1025 mb
Low level cloud: 60%
Mid level cloud: 42%
High level cloud: 9%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 24
Apr		01:00

N
N

 3 / 6 mph 43 / 41°F 84% 1026 mb
Low level cloud: 59%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 2 / 4 mph 40 / 39°F 91% 1027 mb
Low level cloud: 79%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 2 / 2 mph 49 / 49°F 72% 1029 mb
Low level cloud: 60%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 2 / 2 mph 59 / 58°F 57% 1029 mb
Low level cloud: 44%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

 3 / 4 mph 69 / 67°F 47% 1027 mb
Low level cloud: 34%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 6 / 7 mph 69 / 67°F 51% 1026 mb
Low level cloud: 34%
Mid level cloud: 2%
High level cloud: 16%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 6 / 10 mph 56 / 52°F 73% 1028 mb
Low level cloud: 49%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 5 / 7 mph 51 / 50°F 77% 1028 mb
Low level cloud: 2%
Mid level cloud: 62%
High level cloud: 51%
Most Significant Cloud Type: medium
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 25
Apr		01:00

SSE
SSE

 4 / 7 mph 47 / 45°F 86% 1028 mb
Low level cloud: 6%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: medium
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 5 / 9 mph 47 / 45°F 84% 1027 mb
Low level cloud: 1%
Mid level cloud: 44%
High level cloud: 11%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 7 / 9 mph 50 / 48°F 82% 1027 mb
Low level cloud: 6%
Mid level cloud: 91%
High level cloud: 7%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 10 / 13 mph 53 / 49°F 85% 1025 mb
Low level cloud: 64%
Mid level cloud: 63%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 12 / 16 mph 55 / 51°F 92% 1022 mb
Low level cloud: 100%
Mid level cloud: 76%
High level cloud: 29%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

S
S

 14 / 21 mph 56 / 53°F 94% 1019 mb
Low level cloud: 100%
Mid level cloud: 92%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SSW
SSW

 15 / 22 mph 57 / 54°F 93% 1016 mb
Low level cloud: 100%
Mid level cloud: 63%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 15 / 22 mph 58 / 55°F 94% 1015 mb
Low level cloud: 99%
Mid level cloud: 56%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 26
Apr		01:00

SSW
SSW

 2 / 3 mph 58 / 59°F 75% 1026 mb
Low level cloud: 20%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
07:00

S
S

 6 / 11 mph 56 / 55°F 93% 1018 mb
Low level cloud: 42%
Mid level cloud: 90%
High level cloud: 93%
Most Significant Cloud Type: low
84%
0.0 In
13:00

NNW
NNW

 6 / 8 mph 61 / 61°F 57% 1017 mb
Low level cloud: 11%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
82%
0.0 In
19:00

NNW
NNW

 11 / 16 mph 47 / 42°F 55% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
Sun 27
Apr		01:00

NW
NW

 12 / 19 mph 42 / 36°F 67% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NNW
NNW

 3 / 6 mph 57 / 58°F 58% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

WNW
WNW

 6 / 11 mph 71 / 71°F 29% 1025 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
19:00

NNW
NNW

 3 / 6 mph 55 / 55°F 45% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 28
Apr		01:00

NNE
NNE

 4 / 6 mph 51 / 50°F 68% 1030 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
07:00

WSW
WSW

 1 / 1 mph 53 / 53°F 56% 1035 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

SSE
SSE

 7 / 12 mph 68 / 68°F 39% 1027 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
0.0 In
19:00

SSW
SSW

 9 / 14 mph 53 / 50°F 47% 1032 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 32%
Most Significant Cloud Type: medium
19%
0.0 In
Tue 29
Apr		01:00

S
S

 7 / 13 mph 52 / 49°F 97% 1021 mb
Low level cloud: 100%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
07:00

SSW
SSW

 9 / 14 mph 52 / 49°F 84% 1027 mb
Low level cloud: 69%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.0 In
13:00

SW
SW

 7 / 12 mph 62 / 62°F 92% 1015 mb
Low level cloud: 98%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
19:00

SSW
SSW

 12 / 19 mph 59 / 59°F 92% 1018 mb
Low level cloud: 100%
Mid level cloud: 32%
High level cloud: 56%
Most Significant Cloud Type: low
100%
0.0 In
Wed 30
Apr		01:00

SSW
SSW

 8 / 14 mph 60 / 60°F 97% 1011 mb
Low level cloud: 95%
Mid level cloud: 23%
High level cloud: 96%
Most Significant Cloud Type: low
100%
0.0 In
07:00

W
W

 7 / 11 mph 59 / 59°F 92% 1014 mb
Low level cloud: 52%
Mid level cloud: 96%
High level cloud: 94%
Most Significant Cloud Type: low
96%
0.0 In
13:00

SSW
SSW

 16 / 28 mph 81 / 83°F 53% 1006 mb
Low level cloud: 8%
Mid level cloud: 11%
High level cloud: 7%
Most Significant Cloud Type: low
12%
0.0 In
19:00

NNW
NNW

 2 / 4 mph 62 / 62°F 64% 1015 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 66%
Most Significant Cloud Type: medium
12%
0.0 In
Thu 01
May		01:00

SSW
SSW

 10 / 18 mph 62 / 62°F 92% 1005 mb
Low level cloud: 100%
Mid level cloud: 51%
High level cloud: 59%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NNW
NNW

 4 / 7 mph 60 / 60°F 55% 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

NNW
NNW

 7 / 12 mph 69 / 69°F 45% 1012 mb
Low level cloud: 4%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: medium
70%
0.2 In
19:00

SSE
SSE

 4 / 6 mph 61 / 61°F 57% 1018 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 21%
Most Significant Cloud Type: medium
17%
0.0 In
Fri 02
May		01:00

NNE
NNE

 5 / 9 mph 53 / 52°F 81% 1022 mb
Low level cloud: 37%
Mid level cloud: 27%
High level cloud: 93%
Most Significant Cloud Type: low
57%
0.0 In
07:00

NE
NE

 7 / 11 mph 55 / 53°F 62% 1023 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
0.0 In
13:00

ESE
ESE

 8 / 14 mph 64 / 64°F 47% 1025 mb
Low level cloud: 65%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
92%
0.0 In
19:00

ENE
ENE

 7 / 11 mph 53 / 51°F 73% 1023 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
5%
0.0 In
Sat 03
May		01:00

SE
SE

 2 / 3 mph 56 / 56°F 74% 1026 mb
Low level cloud: 21%
Mid level cloud: 10%
High level cloud: 5%
Most Significant Cloud Type: low
25%
0.0 In
07:00

NE
NE

 10 / 16 mph 42 / 37°F 95% 1021 mb
Low level cloud: 98%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
13:00

ESE
ESE

 9 / 16 mph 68 / 68°F 39% 1023 mb
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
19:00

NE
NE

 13 / 22 mph 42 / 35°F 97% 1016 mb
Low level cloud: 100%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.6 In
Sun 04
May		01:00

E
E

 2 / 4 mph 47 / 48°F 85% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
8%
0.0 In
07:00

NE
NE

 13 / 23 mph 42 / 35°F 98% 1014 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

E
E

 9 / 16 mph 52 / 49°F 84% 1018 mb
Low level cloud: 100%
Mid level cloud: 47%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NE
NE

 10 / 20 mph 47 / 43°F 98% 1011 mb
Low level cloud: 100%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
100%
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