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Provincetown 14 Day Long Range Forecast

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

Massachusetts, United States Of America

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

The outlook for Provincetown in the two weeks ahead shows the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 24°C expected on the afternoon of Thursday 23rd. The average minimum temperature will be 12°C, dipping to its lowest on the morning of Saturday 25th at 10°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Current predictions suggest Saturday 18th will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be moderate. The forecast suggests the strongest wind will be on the evening of Sunday 26th, coming from a south westerly direction, and reaching around 31mph. However, the maximum wind gusts are expected on Thursday morning.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May
01:00

NE
NE

17 / 33 mph 53 / 49°F 88% 1012 mb
Low level cloud: 16%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

17 / 36 mph 52 / 47°F 87% 1012 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

18 / 33 mph 52 / 47°F 90% 1015 mb
Low level cloud: 7%
Mid level cloud: 98%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

18 / 26 mph 57 / 52°F 90% 1015 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

16 / 19 mph 61 / 60°F 90% 1014 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 33%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

16 / 18 mph 59 / 54°F 90% 1015 mb
Low level cloud: 9%
Mid level cloud: 28%
High level cloud: 2%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

16 / 19 mph 56 / 52°F 90% 1016 mb
Low level cloud: 69%
Mid level cloud: 39%
High level cloud: 79%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

18 / 20 mph 54 / 49°F 90% 1015 mb
Low level cloud: 94%
Mid level cloud: 91%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
19:00

NE
NE

21 / 24 mph 55 / 49°F 95% 1015 mb
Low level cloud: 91%
Mid level cloud: 54%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

16 / 19 mph 53 / 48°F 95% 1016 mb
Low level cloud: 98%
Mid level cloud: 52%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
01:00

NNE
NNE

16 / 20 mph 52 / 47°F 95% 1015 mb
Low level cloud: 99%
Mid level cloud: 46%
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

NNE
NNE

18 / 25 mph 51 / 46°F 95% 1016 mb
Low level cloud: 100%
Mid level cloud: 46%
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

NNE
NNE

18 / 25 mph 51 / 46°F 96% 1016 mb
Low level cloud: 95%
Mid level cloud: 34%
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

NNE
NNE

19 / 22 mph 54 / 49°F 94% 1017 mb
Low level cloud: 92%
Mid level cloud: 43%
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

NNE
NNE

17 / 20 mph 56 / 51°F 93% 1017 mb
Low level cloud: 87%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

16 / 19 mph 56 / 52°F 93% 1016 mb
Low level cloud: 88%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

14 / 16 mph 56 / 51°F 93% 1017 mb
Low level cloud: 57%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

12 / 14 mph 53 / 49°F 93% 1017 mb
Low level cloud: 70%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
01:00

NNE
NNE

11 / 13 mph 53 / 50°F 93% 1017 mb
Low level cloud: 76%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

13 / 17 mph 52 / 47°F 94% 1017 mb
Low level cloud: 91%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

11 / 15 mph 52 / 48°F 94% 1017 mb
Low level cloud: 76%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

9 / 10 mph 57 / 53°F 92% 1018 mb
Low level cloud: 41%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

6 / 7 mph 60 / 57°F 90% 1018 mb
Low level cloud: 30%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

5 / 5 mph 60 / 58°F 88% 1017 mb
Low level cloud: 20%
Mid level cloud: 1%
High level cloud: 12%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

5 / 6 mph 58 / 56°F 88% 1016 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

10 / 15 mph 54 / 51°F 88% 1016 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
01:00

SW
SW

9 / 11 mph 57 / 56°F 92% 1016 mb
Low level cloud: 11%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

9 / 16 mph 55 / 52°F 91% 1015 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

9 / 18 mph 56 / 52°F 89% 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
10:00

S
S

9 / 15 mph 63 / 62°F 82% 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
13:00

S
S

14 / 20 mph 68 / 67°F 78% 1015 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
16:00

SSW
SSW

19 / 22 mph 69 / 68°F 81% 1014 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
19:00

SSW
SSW

20 / 24 mph 65 / 64°F 86% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

19 / 27 mph 60 / 60°F 88% 1015 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 21%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
01:00

SSW
SSW

18 / 28 mph 59 / 59°F 88% 1014 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 3%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

17 / 32 mph 57 / 53°F 88% 1015 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 1%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

17 / 33 mph 58 / 53°F 89% 1015 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

17 / 34 mph 65 / 63°F 84% 1015 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
13:00

SSW
SSW

22 / 31 mph 70 / 69°F 81% 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
16:00

SSW
SSW

24 / 28 mph 71 / 70°F 77% 1013 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
19:00

SSW
SSW

25 / 28 mph 67 / 66°F 81% 1012 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

22 / 28 mph 61 / 62°F 84% 1012 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
01:00

SSW
SSW

21 / 27 mph 61 / 61°F 85% 1011 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

SW
SW

23 / 41 mph 58 / 54°F 85% 1011 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 99%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

21 / 43 mph 59 / 54°F 85% 1009 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

26 / 31 mph 67 / 66°F 82% 1008 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

28 / 32 mph 74 / 77°F 84% 1007 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 10%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

23 / 27 mph 75 / 78°F 89% 1006 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

19 / 22 mph 71 / 69°F 93% 1006 mb
Low level cloud: 28%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

13 / 23 mph 64 / 64°F 95% 1007 mb
Low level cloud: 2%
Mid level cloud: 47%
High level cloud: 29%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May
01:00

WNW
WNW

13 / 27 mph 59 / 56°F 81% 1014 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
07:00

SW
SW

15 / 30 mph 57 / 54°F 84% 1007 mb
Low level cloud: 0%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: medium
95%
0.0 In
13:00

WSW
WSW

11 / 23 mph 69 / 69°F 63% 1011 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 99%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

SSW
SSW

15 / 30 mph 67 / 67°F 70% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Sat 25
May
01:00

NE
NE

17 / 33 mph 51 / 46°F 84% 1018 mb
Low level cloud: 72%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
07:00

WNW
WNW

16 / 21 mph 53 / 49°F 76% 1010 mb
Low level cloud: 15%
Mid level cloud: 44%
High level cloud: 19%
Most Significant Cloud Type: medium
85%
0.0 In
13:00

SE
SE

2 / 4 mph 60 / 60°F 65% 1012 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
19:00

SW
SW

11 / 17 mph 60 / 60°F 57% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: medium
8%
0.0 In
Sun 26
May
01:00

SW
SW

18 / 22 mph 57 / 52°F 76% 1020 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
07:00

NNE
NNE

12 / 19 mph 55 / 52°F 80% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
0.0 In
13:00

SSW
SSW

29 / 35 mph 64 / 64°F 62% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 12%
Most Significant Cloud Type: medium
9%
0.0 In
19:00

SW
SW

9 / 16 mph 60 / 60°F 64% 1023 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 27
May
01:00

SW
SW

21 / 41 mph 56 / 51°F 89% 1014 mb
Low level cloud: 10%
Mid level cloud: 30%
High level cloud: 4%
Most Significant Cloud Type: medium
59%
0.0 In
07:00

WNW
WNW

5 / 11 mph 56 / 55°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
13:00

E
E

7 / 15 mph 64 / 64°F 73% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

SE
SE

14 / 19 mph 64 / 64°F 75% 1015 mb
Low level cloud: 0%
Mid level cloud: 70%
High level cloud: 2%
Most Significant Cloud Type: medium
70%
0.0 In
Tue 28
May
01:00

SSE
SSE

11 / 23 mph 57 / 55°F 97% 1013 mb
Low level cloud: 47%
Mid level cloud: 47%
High level cloud: 32%
Most Significant Cloud Type: low
67%
0.0 In
07:00

E
E

12 / 25 mph 54 / 51°F 77% 1013 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: medium
46%
0.0 In
13:00

N
N

11 / 13 mph 64 / 64°F 98% 1013 mb
Low level cloud: 92%
Mid level cloud: 18%
High level cloud: 27%
Most Significant Cloud Type: low
100%
0.4 In
19:00

N
N

7 / 9 mph 59 / 58°F 94% 1015 mb
Low level cloud: 97%
Mid level cloud: 98%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
Wed 29
May
01:00

SSW
SSW

19 / 31 mph 59 / 60°F 98% 1009 mb
Low level cloud: 89%
Mid level cloud: 18%
High level cloud: 96%
Most Significant Cloud Type: low
100%
0.1 In
07:00

WSW
WSW

6 / 8 mph 56 / 55°F 89% 1015 mb
Low level cloud: 16%
Mid level cloud: 1%
High level cloud: 89%
Most Significant Cloud Type: low
26%
0.0 In
13:00

SSE
SSE

13 / 27 mph 66 / 66°F 83% 1009 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

SSW
SSW

16 / 21 mph 62 / 62°F 86% 1012 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 15%
Most Significant Cloud Type: medium
45%
0.0 In
Thu 30
May
01:00

WNW
WNW

12 / 24 mph 57 / 54°F 93% 1011 mb
Low level cloud: 42%
Mid level cloud: 97%
High level cloud: 0%
Most Significant Cloud Type: low
76%
0.0 In
07:00

SSW
SSW

8 / 15 mph 57 / 55°F 99% 1013 mb
Low level cloud: 91%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
13:00

NW
NW

10 / 19 mph 59 / 59°F 70% 1013 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 3%
Most Significant Cloud Type: medium
14%
0.0 In
19:00

SE
SE

7 / 11 mph 61 / 61°F 94% 1012 mb
Low level cloud: 42%
Mid level cloud: 24%
High level cloud: 12%
Most Significant Cloud Type: low
52%
0.2 In
Fri 31
May
01:00

N
N

15 / 24 mph 54 / 49°F 87% 1019 mb
Low level cloud: 61%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.0 In
07:00

SSE
SSE

10 / 15 mph 55 / 53°F 96% 1012 mb
Low level cloud: 86%
Mid level cloud: 68%
High level cloud: 41%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNE
NNE

12 / 20 mph 54 / 50°F 80% 1023 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

SSE
SSE

12 / 17 mph 60 / 60°F 94% 1010 mb
Low level cloud: 45%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.3 In
Sat 01
Jun
01:00

WNW
WNW

12 / 23 mph 57 / 54°F 75% 1022 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 11%
Most Significant Cloud Type: medium
9%
0.0 In
07:00

SSW
SSW

11 / 21 mph 58 / 55°F 97% 1010 mb
Low level cloud: 66%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.0 In
13:00

ENE
ENE

8 / 13 mph 62 / 62°F 82% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

SSW
SSW

23 / 37 mph 63 / 63°F 81% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: high
18%
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