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Yountville 14 Day Long Range Forecast

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

California, United States Of America

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

Reviewing the forecast for Yountville Over the next 14 days and the average daytime maximum temperature will be around 21°C, with a high for the two weeks of 26°C expected on the afternoon of Monday 10th. The mean minimum temperature will be 12°C, dipping to its lowest on the morning of Tuesday 4th at 10°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. Current predictions suggest Wednesday 5th will have the most precipitation with an accumulation of around 26.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 03
Nov
01:00

W
W

2 / 3 mph 56 / 56°F 79% 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
04:00

WSW
WSW

3 / 5 mph 56 / 56°F 89% 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
07:00

SW
SW

2 / 5 mph 50 / 50°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
10:00

SW
SW

4 / 5 mph 69 / 68°F 48% 1017 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

WSW
WSW

7 / 8 mph 75 / 74°F 25% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

6 / 7 mph 72 / 75°F 43% 1015 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

WSW
WSW

5 / 8 mph 55 / 55°F 73% 1017 mb
Low level cloud: 3%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

4 / 7 mph 53 / 52°F 83% 1017 mb
Low level cloud: 9%
Mid level cloud: 9%
High level cloud: 38%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 04
Nov
16:00

SSW
SSW

5 / 6 mph 69 / 68°F 62% 1014 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 14%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

4 / 8 mph 56 / 55°F 88% 1015 mb
Low level cloud: 32%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

6 / 10 mph 58 / 56°F 85% 1014 mb
Low level cloud: 53%
Mid level cloud: 9%
High level cloud: 18%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 05
Nov
01:00

S
S

13 / 15 mph 61 / 61°F 80% 1012 mb
Low level cloud: 83%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

18 / 21 mph 60 / 60°F 88% 1010 mb
Low level cloud: 94%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
07:00

SSW
SSW

11 / 13 mph 59 / 59°F 95% 1013 mb
Low level cloud: 100%
Mid level cloud: 94%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.6 In of precipitation over the past 3 hours.
0.6 In
10:00

SSW
SSW

11 / 13 mph 61 / 60°F 94% 1016 mb
Low level cloud: 99%
Mid level cloud: 16%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

SSW
SSW

10 / 14 mph 63 / 63°F 90% 1017 mb
Low level cloud: 96%
Mid level cloud: 30%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

SSW
SSW

6 / 9 mph 62 / 62°F 92% 1017 mb
Low level cloud: 89%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SSW
SSW

4 / 5 mph 59 / 59°F 93% 1019 mb
Low level cloud: 93%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

3 / 4 mph 58 / 59°F 88% 1021 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
Thu 06
Nov
01:00

WSW
WSW

3 / 4 mph 56 / 56°F 85% 1022 mb
Low level cloud: 42%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

2 / 5 mph 51 / 52°F 91% 1022 mb
Low level cloud: 8%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

3 / 6 mph 50 / 50°F 93% 1023 mb
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

1 / 2 mph 66 / 65°F 66% 1023 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 16%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

4 / 4 mph 71 / 70°F 50% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 22%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

5 / 6 mph 69 / 68°F 54% 1020 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 19%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

4 / 8 mph 54 / 54°F 78% 1021 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 34%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

3 / 5 mph 57 / 57°F 76% 1022 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 33%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 07
Nov
01:00

WSW
WSW

3 / 6 mph 53 / 53°F 83% 1021 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 21%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

2 / 4 mph 54 / 54°F 82% 1020 mb
Low level cloud: 63%
Mid level cloud: 32%
High level cloud: 28%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

3 / 4 mph 56 / 57°F 85% 1020 mb
Low level cloud: 82%
Mid level cloud: 48%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

2 / 2 mph 61 / 61°F 83% 1021 mb
Low level cloud: 83%
Mid level cloud: 38%
High level cloud: 4%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

2 / 2 mph 67 / 67°F 75% 1020 mb
Low level cloud: 94%
Mid level cloud: 23%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

1 / 1 mph 68 / 67°F 75% 1018 mb
Low level cloud: 59%
Mid level cloud: 14%
High level cloud: 3%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

2 / 5 mph 59 / 60°F 86% 1018 mb
Low level cloud: 21%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

3 / 6 mph 57 / 57°F 89% 1019 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
Sat 08
Nov
01:00

N
N

4 / 8 mph 54 / 53°F 90% 1019 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
04:00

N
N

3 / 7 mph 52 / 51°F 89% 1018 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
07:00

N
N

3 / 6 mph 51 / 51°F 87% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

1 / 1 mph 70 / 69°F 53% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 9%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

2 / 2 mph 77 / 76°F 38% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

2 / 3 mph 73 / 76°F 45% 1015 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 6%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

1 / 2 mph 58 / 58°F 58% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

2 / 4 mph 57 / 58°F 59% 1017 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
Sun 09
Nov
01:00

NNE
NNE

3 / 6 mph 55 / 56°F 57% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

3 / 7 mph 54 / 54°F 55% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

3 / 7 mph 53 / 52°F 57% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

3 / 4 mph 71 / 70°F 40% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 78%
Most Significant Cloud Type: high
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

3 / 4 mph 76 / 77°F 39% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

3 / 4 mph 70 / 70°F 50% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 94%
Most Significant Cloud Type: high
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

2 / 4 mph 59 / 59°F 63% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

2 / 5 mph 58 / 59°F 64% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 10
Nov
04:00

W
W

4 / 9 mph 48 / 47°F 97% 1019 mb
Low level cloud: 25%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
10:00

WNW
WNW

3 / 5 mph 64 / 64°F 88% 1017 mb
Low level cloud: 74%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
89%
0.0 In
16:00

SW
SW

4 / 8 mph 78 / 80°F 59% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
22:00

W
W

2 / 5 mph 62 / 62°F 68% 1016 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 47%
Most Significant Cloud Type: medium
45%
0.0 In
Tue 11
Nov
04:00

N
N

3 / 6 mph 61 / 61°F 59% 1018 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 94%
Most Significant Cloud Type: medium
25%
0.0 In
10:00

ESE
ESE

2 / 3 mph 74 / 77°F 48% 1019 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
16:00

S
S

2 / 4 mph 81 / 81°F 47% 1015 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
10%
0.0 In
22:00

WSW
WSW

4 / 7 mph 63 / 63°F 67% 1012 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
Wed 12
Nov
04:00

ENE
ENE

0 / 0 mph 60 / 60°F 68% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 73%
Most Significant Cloud Type: medium
8%
0.0 In
10:00

SE
SE

5 / 9 mph 64 / 64°F 77% 1012 mb
Low level cloud: 34%
Mid level cloud: 45%
High level cloud: 11%
Most Significant Cloud Type: low
51%
0.0 In
16:00

SSW
SSW

4 / 8 mph 67 / 67°F 57% 1012 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: medium
52%
0.0 In
22:00

S
S

6 / 13 mph 59 / 59°F 90% 1011 mb
Low level cloud: 93%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.1 In
Thu 13
Nov
04:00

SE
SE

8 / 14 mph 56 / 54°F 86% 1009 mb
Low level cloud: 98%
Mid level cloud: 98%
High level cloud: 15%
Most Significant Cloud Type: low
100%
0.1 In
10:00

S
S

8 / 16 mph 58 / 56°F 94% 1011 mb
Low level cloud: 95%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.4 In
16:00

W
W

12 / 25 mph 63 / 63°F 88% 1005 mb
Low level cloud: 62%
Mid level cloud: 79%
High level cloud: 9%
Most Significant Cloud Type: low
90%
0.7 In
22:00

ENE
ENE

4 / 8 mph 58 / 59°F 97% 1008 mb
Low level cloud: 92%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: low
100%
1.6 In
Fri 14
Nov
04:00

WSW
WSW

5 / 10 mph 51 / 49°F 95% 1011 mb
Low level cloud: 84%
Mid level cloud: 29%
High level cloud: 7%
Most Significant Cloud Type: low
94%
0.4 In
10:00

N
N

7 / 14 mph 59 / 58°F 81% 1008 mb
Low level cloud: 43%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: low
60%
0.1 In
16:00

WSW
WSW

8 / 17 mph 58 / 56°F 56% 1017 mb
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 15%
Most Significant Cloud Type: medium
12%
0.0 In
22:00

W
W

3 / 6 mph 55 / 56°F 86% 1009 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
0.0 In
Sat 15
Nov
04:00

SE
SE

1 / 3 mph 48 / 48°F 92% 1018 mb
Low level cloud: 8%
Mid level cloud: 12%
High level cloud: 5%
Most Significant Cloud Type: low
12%
0.0 In
10:00

WSW
WSW

8 / 16 mph 59 / 58°F 76% 1012 mb
Low level cloud: 89%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
16:00

S
S

9 / 19 mph 57 / 55°F 56% 1011 mb
Low level cloud: 0%
Mid level cloud: 65%
High level cloud: 2%
Most Significant Cloud Type: medium
65%
0.0 In
22:00

W
W

5 / 10 mph 47 / 45°F 91% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
0.1 In
Sun 16
Nov
04:00

ESE
ESE

1 / 3 mph 52 / 52°F 95% 1012 mb
Low level cloud: 66%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
81%
0.5 In
10:00

ESE
ESE

1 / 3 mph 57 / 57°F 66% 1015 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 56%
Most Significant Cloud Type: medium
14%
0.0 In
16:00

NNE
NNE

5 / 11 mph 58 / 57°F 75% 1014 mb
Low level cloud: 55%
Mid level cloud: 14%
High level cloud: 1%
Most Significant Cloud Type: low
60%
0.0 In
22:00

SSE
SSE

5 / 11 mph 49 / 46°F 72% 1007 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Mon 17
Nov
04:00

NW
NW

3 / 7 mph 47 / 46°F 88% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
6%
0.0 In
10:00

E
E

8 / 17 mph 52 / 49°F 87% 1000 mb
Low level cloud: 88%
Mid level cloud: 46%
High level cloud: 96%
Most Significant Cloud Type: low
100%
0.5 In
16:00

WSW
WSW

4 / 8 mph 65 / 65°F 59% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
22:00

NNE
NNE

7 / 14 mph 47 / 44°F 91% 1001 mb
Low level cloud: 84%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.7 In
Tue 18
Nov
04:00

NW
NW

2 / 4 mph 49 / 49°F 86% 1020 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 8%
Most Significant Cloud Type: medium
9%
0.0 In
10:00

WSW
WSW

3 / 6 mph 55 / 56°F 82% 1006 mb
Low level cloud: 10%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
58%
0.0 In
16:00

SSW
SSW

2 / 5 mph 68 / 68°F 59% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 15%
Most Significant Cloud Type: medium
5%
0.0 In
22:00

SSW
SSW

3 / 7 mph 47 / 46°F 91% 1008 mb
Low level cloud: 6%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: medium
68%
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