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Marlborough 14 Day Long Range Forecast

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

Massachusetts, United States Of America

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

Reviewing the forecast for Marlborough Over the next 14 days and 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 Tuesday 22nd. The average minimum temperature will be 7°C, dipping to its lowest on the morning of Monday 21st at 1°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. It looks like 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

 11 / 18 mph 54 / 51°F 76% 1015 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 13%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 10 / 17 mph 54 / 51°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 97%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 11 / 16 mph 59 / 56°F 76% 1013 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 35%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 13 / 16 mph 74 / 76°F 53% 1011 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 22%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 12 / 17 mph 76 / 78°F 59% 1011 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 33%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 13 / 18 mph 79 / 80°F 56% 1010 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 1%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 8 / 14 mph 69 / 67°F 86% 1010 mb
Low level cloud: 57%
Mid level cloud: 68%
High level cloud: 33%
Most Significant Cloud Type: low
84%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

W
W

 12 / 19 mph 66 / 66°F 85% 1012 mb
Low level cloud: 22%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Sun 20
Apr		19:00

NNW
NNW

 9 / 12 mph 51 / 47°F 43% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 7 / 9 mph 48 / 45°F 52% 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

 4 / 7 mph 42 / 39°F 55% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 4 / 8 mph 38 / 35°F 62% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
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 44 / 43°F 43% 1028 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 5%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 3 / 4 mph 58 / 57°F 27% 1026 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 16%
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 65 / 62°F 25% 1023 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 91%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 8 / 10 mph 64 / 62°F 38% 1020 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 53%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 9 / 13 mph 50 / 47°F 52% 1021 mb
Low level cloud: 19%
Mid level cloud: 99%
High level cloud: 88%
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 / 13 mph 48 / 44°F 55% 1019 mb
Low level cloud: 92%
Mid level cloud: 30%
High level cloud: 42%
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 / 11 mph 47 / 44°F 77% 1017 mb
Low level cloud: 98%
Mid level cloud: 69%
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

 7 / 11 mph 47 / 44°F 95% 1015 mb
Low level cloud: 99%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

S
S

 7 / 10 mph 50 / 47°F 97% 1013 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
10:00

WSW
WSW

 9 / 12 mph 58 / 55°F 84% 1012 mb
Low level cloud: 95%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 9 / 10 mph 70 / 67°F 54% 1010 mb
Low level cloud: 46%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 12 / 16 mph 66 / 65°F 48% 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

WNW
WNW

 11 / 17 mph 53 / 49°F 60% 1015 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 10 / 13 mph 47 / 43°F 72% 1017 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
Wed 23
Apr		01:00

WNW
WNW

 8 / 11 mph 45 / 41°F 76% 1018 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 6 / 9 mph 43 / 40°F 82% 1018 mb
Low level cloud: 2%
Mid level cloud: 2%
High level cloud: 16%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 7 / 9 mph 48 / 44°F 68% 1020 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 9%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 6 / 7 mph 59 / 57°F 50% 1020 mb
Low level cloud: 69%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 6 / 7 mph 66 / 64°F 42% 1019 mb
Low level cloud: 12%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 8 / 10 mph 66 / 64°F 43% 1020 mb
Low level cloud: 2%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 6 / 9 mph 56 / 53°F 65% 1023 mb
Low level cloud: 14%
Mid level cloud: 21%
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 / 7 mph 48 / 46°F 75% 1025 mb
Low level cloud: 51%
Mid level cloud: 43%
High level cloud: 18%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 24
Apr		01:00

N
N

 3 / 6 mph 45 / 44°F 80% 1026 mb
Low level cloud: 41%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 2 / 4 mph 42 / 42°F 88% 1027 mb
Low level cloud: 76%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 2 / 3 mph 49 / 49°F 70% 1029 mb
Low level cloud: 48%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 1 / 1 mph 59 / 57°F 56% 1029 mb
Low level cloud: 31%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 3 / 3 mph 69 / 66°F 47% 1027 mb
Low level cloud: 49%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 4 / 6 mph 69 / 66°F 51% 1026 mb
Low level cloud: 57%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 7 / 10 mph 56 / 53°F 72% 1028 mb
Low level cloud: 17%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 5 / 7 mph 51 / 49°F 77% 1028 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 57%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 25
Apr		01:00

S
S

 4 / 7 mph 48 / 46°F 84% 1028 mb
Low level cloud: 2%
Mid level cloud: 57%
High level cloud: 9%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 5 / 9 mph 48 / 45°F 83% 1027 mb
Low level cloud: 2%
Mid level cloud: 45%
High level cloud: 20%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 7 / 11 mph 50 / 47°F 82% 1028 mb
Low level cloud: 5%
Mid level cloud: 92%
High level cloud: 15%
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 / 15 mph 52 / 48°F 87% 1025 mb
Low level cloud: 44%
Mid level cloud: 66%
High level cloud: 6%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 12 / 18 mph 53 / 49°F 93% 1023 mb
Low level cloud: 95%
Mid level cloud: 92%
High level cloud: 53%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

SSW
SSW

 14 / 22 mph 56 / 53°F 94% 1019 mb
Low level cloud: 100%
Mid level cloud: 95%
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 / 23 mph 57 / 53°F 93% 1017 mb
Low level cloud: 100%
Mid level cloud: 58%
High level cloud: 7%
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 / 24 mph 57 / 54°F 94% 1015 mb
Low level cloud: 99%
Mid level cloud: 55%
High level cloud: 14%
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

S
S

 2 / 4 mph 57 / 58°F 76% 1026 mb
Low level cloud: 17%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
07:00

S
S

 7 / 15 mph 56 / 54°F 92% 1019 mb
Low level cloud: 29%
Mid level cloud: 86%
High level cloud: 36%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

N
N

 6 / 8 mph 60 / 60°F 59% 1017 mb
Low level cloud: 23%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: low
52%
0.0 In
19:00

NNW
NNW

 10 / 16 mph 48 / 43°F 53% 1024 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

 11 / 19 mph 42 / 36°F 68% 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 56 / 57°F 59% 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

 7 / 11 mph 69 / 69°F 29% 1025 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
19:00

N
N

 3 / 5 mph 59 / 59°F 43% 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 / 7 mph 54 / 53°F 67% 1029 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
07:00

SW
SW

 2 / 3 mph 52 / 53°F 55% 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

S
S

 8 / 13 mph 67 / 67°F 38% 1027 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
0.0 In
19:00

SSW
SSW

 9 / 14 mph 52 / 49°F 49% 1032 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 34%
Most Significant Cloud Type: medium
19%
0.0 In
Tue 29
Apr		01:00

S
S

 10 / 17 mph 51 / 47°F 96% 1021 mb
Low level cloud: 100%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
07:00

SSW
SSW

 10 / 16 mph 53 / 49°F 79% 1027 mb
Low level cloud: 43%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
13:00

SW
SW

 7 / 12 mph 61 / 61°F 90% 1015 mb
Low level cloud: 98%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
19:00

SSW
SSW

 11 / 19 mph 58 / 56°F 93% 1019 mb
Low level cloud: 100%
Mid level cloud: 31%
High level cloud: 86%
Most Significant Cloud Type: low
100%
0.0 In
Wed 30
Apr		01:00

SSW
SSW

 9 / 14 mph 59 / 59°F 97% 1011 mb
Low level cloud: 90%
Mid level cloud: 22%
High level cloud: 75%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WSW
WSW

 7 / 12 mph 58 / 57°F 96% 1014 mb
Low level cloud: 87%
Mid level cloud: 99%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.1 In
13:00

SSW
SSW

 17 / 29 mph 79 / 80°F 54% 1006 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 10%
Most Significant Cloud Type: medium
13%
0.0 In
19:00

WNW
WNW

 2 / 4 mph 65 / 65°F 64% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 99%
Most Significant Cloud Type: medium
9%
0.1 In
Thu 01
May		01:00

SSW
SSW

 11 / 19 mph 60 / 60°F 94% 1005 mb
Low level cloud: 100%
Mid level cloud: 48%
High level cloud: 73%
Most Significant Cloud Type: low
100%
0.0 In
07:00

N
N

 4 / 6 mph 59 / 59°F 55% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
13:00

NNW
NNW

 4 / 8 mph 67 / 67°F 53% 1012 mb
Low level cloud: 30%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.1 In
19:00

SE
SE

 4 / 7 mph 62 / 62°F 59% 1018 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 47%
Most Significant Cloud Type: medium
18%
0.0 In
Fri 02
May		01:00

NE
NE

 5 / 9 mph 55 / 55°F 77% 1021 mb
Low level cloud: 46%
Mid level cloud: 25%
High level cloud: 44%
Most Significant Cloud Type: low
60%
0.0 In
07:00

NE
NE

 7 / 12 mph 54 / 52°F 60% 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

E
E

 8 / 14 mph 62 / 62°F 48% 1025 mb
Low level cloud: 37%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
58%
0.0 In
19:00

ENE
ENE

 8 / 13 mph 52 / 49°F 74% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
0.0 In
Sat 03
May		01:00

SSE
SSE

 2 / 4 mph 56 / 57°F 81% 1026 mb
Low level cloud: 13%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: low
16%
0.0 In
07:00

NE
NE

 11 / 18 mph 41 / 35°F 94% 1020 mb
Low level cloud: 100%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
13:00

SE
SE

 8 / 15 mph 68 / 68°F 39% 1023 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
19:00

NE
NE

 14 / 24 mph 42 / 35°F 97% 1016 mb
Low level cloud: 100%
Mid level cloud: 82%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
Sun 04
May		01:00

ESE
ESE

 2 / 4 mph 48 / 49°F 88% 1022 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
3%
0.0 In
07:00

NE
NE

 14 / 25 mph 42 / 35°F 98% 1013 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

E
E

 9 / 15 mph 52 / 49°F 83% 1017 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 11%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NE
NE

 10 / 20 mph 47 / 42°F 98% 1010 mb
Low level cloud: 100%
Mid level cloud: 15%
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