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Chaldon 14 Day Long Range Forecast

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

Surrey, United Kingdom

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

Reviewing the forecast for Chaldon Over the next 14 days and the average daytime maximum temperature will be around 20°C, with a high for the two weeks of 22°C expected on the afternoon of Sunday 7th. The mean minimum temperature will be 14°C, dipping to its lowest on the morning of Tuesday 9th at 11°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. It looks like Thursday 4th will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 30
Aug		18:00

S
S

 17 / 24 mph 63 / 63°F 88% 1002 mb
Low level cloud: 91%
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
21:00

SSW
SSW

 17 / 26 mph 64 / 64°F 93% 1001 mb
Low level cloud: 100%
Mid level cloud: 63%
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 31
Aug		00:00

WSW
WSW

 13 / 19 mph 61 / 61°F 89% 1003 mb
Low level cloud: 46%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 9 / 11 mph 58 / 57°F 89% 1004 mb
Low level cloud: 9%
Mid level cloud: 1%
High level cloud: 9%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 6 / 10 mph 56 / 55°F 87% 1005 mb
Low level cloud: 23%
Mid level cloud: 14%
High level cloud: 86%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 14 / 17 mph 64 / 63°F 67% 1006 mb
Low level cloud: 64%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 17 / 19 mph 69 / 68°F 51% 1005 mb
Low level cloud: 61%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 16 / 19 mph 70 / 68°F 51% 1004 mb
Low level cloud: 43%
Mid level cloud: 24%
High level cloud: 35%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 11 / 13 mph 67 / 66°F 60% 1004 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 91%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 7 / 10 mph 61 / 61°F 77% 1004 mb
Low level cloud: 14%
Mid level cloud: 23%
High level cloud: 2%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 01
Sep		00:00

SSW
SSW

 7 / 11 mph 59 / 58°F 80% 1004 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 5%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 7 / 12 mph 57 / 56°F 84% 1002 mb
Low level cloud: 14%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 10 / 16 mph 57 / 55°F 83% 1003 mb
Low level cloud: 35%
Mid level cloud: 9%
High level cloud: 16%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 17 / 21 mph 64 / 63°F 68% 1003 mb
Low level cloud: 55%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 18 / 22 mph 67 / 67°F 57% 1002 mb
Low level cloud: 77%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 15 / 19 mph 68 / 67°F 58% 1003 mb
Low level cloud: 47%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 12 / 18 mph 65 / 64°F 69% 1004 mb
Low level cloud: 44%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 9 / 12 mph 60 / 60°F 82% 1005 mb
Low level cloud: 8%
Mid level cloud: 16%
High level cloud: 9%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 02
Sep		00:00

SW
SW

 7 / 10 mph 58 / 57°F 85% 1005 mb
Low level cloud: 11%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 5 / 8 mph 56 / 56°F 89% 1005 mb
Low level cloud: 5%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 5 / 9 mph 55 / 54°F 88% 1005 mb
Low level cloud: 5%
Mid level cloud: 13%
High level cloud: 7%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 12 / 14 mph 65 / 64°F 61% 1005 mb
Low level cloud: 31%
Mid level cloud: 23%
High level cloud: 19%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

 13 / 15 mph 68 / 68°F 52% 1005 mb
Low level cloud: 73%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

 11 / 13 mph 69 / 68°F 61% 1005 mb
Low level cloud: 36%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 7 / 9 mph 66 / 65°F 77% 1005 mb
Low level cloud: 19%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 6 / 9 mph 61 / 61°F 91% 1007 mb
Low level cloud: 34%
Mid level cloud: 12%
High level cloud: 7%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 03
Sep		00:00

SSW
SSW

 7 / 12 mph 59 / 58°F 93% 1006 mb
Low level cloud: 45%
Mid level cloud: 45%
High level cloud: 18%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 9 / 15 mph 59 / 57°F 93% 1007 mb
Low level cloud: 44%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 9 / 14 mph 58 / 57°F 91% 1007 mb
Low level cloud: 64%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 17 / 24 mph 63 / 62°F 89% 1007 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 19 / 28 mph 64 / 64°F 89% 1007 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 18 / 28 mph 67 / 67°F 81% 1007 mb
Low level cloud: 65%
Mid level cloud: 67%
High level cloud: 20%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 13 / 19 mph 68 / 67°F 79% 1006 mb
Low level cloud: 30%
Mid level cloud: 45%
High level cloud: 22%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 13 / 20 mph 66 / 66°F 84% 1006 mb
Low level cloud: 94%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 04
Sep		00:00

SSW
SSW

 19 / 28 mph 65 / 65°F 90% 1004 mb
Low level cloud: 97%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 16 / 25 mph 63 / 63°F 89% 1003 mb
Low level cloud: 75%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
88%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
06:00

SSW
SSW

 18 / 29 mph 60 / 60°F 86% 1004 mb
Low level cloud: 88%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 17 / 21 mph 65 / 64°F 70% 1005 mb
Low level cloud: 42%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 17 / 20 mph 68 / 67°F 53% 1006 mb
Low level cloud: 87%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 15 / 20 mph 67 / 66°F 57% 1008 mb
Low level cloud: 26%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 15 / 20 mph 64 / 63°F 71% 1009 mb
Low level cloud: 25%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

 12 / 18 mph 59 / 59°F 81% 1010 mb
Low level cloud: 14%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 05
Sep		00:00

SW
SW

 11 / 16 mph 58 / 56°F 81% 1010 mb
Low level cloud: 5%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 12 / 17 mph 56 / 54°F 86% 1011 mb
Low level cloud: 23%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 10 / 13 mph 55 / 51°F 86% 1013 mb
Low level cloud: 7%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 13 / 15 mph 58 / 55°F 59% 1016 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 12 / 14 mph 66 / 65°F 39% 1017 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
15:00

W
W

 10 / 11 mph 68 / 67°F 36% 1017 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
18:00

SW
SW

 8 / 9 mph 67 / 66°F 51% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

 5 / 6 mph 63 / 63°F 71% 1019 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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 06
Sep		00:00

SW
SW

 9 / 19 mph 63 / 63°F 85% 1014 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
06:00

NW
NW

 5 / 11 mph 63 / 63°F 71% 1016 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
12:00

WNW
WNW

 5 / 11 mph 64 / 64°F 95% 1013 mb
Low level cloud: 98%
Mid level cloud: 98%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SW
SW

 11 / 22 mph 73 / 77°F 63% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
0.0 In
Sun 07
Sep		00:00

E
E

 3 / 6 mph 72 / 76°F 70% 1018 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
06:00

SE
SE

 10 / 20 mph 62 / 62°F 77% 1009 mb
Low level cloud: 0%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: medium
54%
0.0 In
12:00

SW
SW

 13 / 27 mph 73 / 77°F 58% 1016 mb
Low level cloud: 53%
Mid level cloud: 45%
High level cloud: 7%
Most Significant Cloud Type: low
70%
0.0 In
18:00

WSW
WSW

 13 / 28 mph 70 / 70°F 76% 1011 mb
Low level cloud: 51%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
52%
0.0 In
Mon 08
Sep		00:00

S
S

 3 / 6 mph 67 / 67°F 91% 1015 mb
Low level cloud: 20%
Mid level cloud: 26%
High level cloud: 2%
Most Significant Cloud Type: low
29%
0.0 In
06:00

S
S

 10 / 21 mph 59 / 57°F 80% 1012 mb
Low level cloud: 15%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: medium
92%
0.0 In
12:00

SW
SW

 7 / 15 mph 67 / 67°F 81% 1013 mb
Low level cloud: 93%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
18:00

SSW
SSW

 14 / 29 mph 64 / 64°F 85% 1007 mb
Low level cloud: 46%
Mid level cloud: 60%
High level cloud: 76%
Most Significant Cloud Type: low
75%
0.1 In
Tue 09
Sep		00:00

SW
SW

 6 / 13 mph 64 / 64°F 86% 1016 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
4%
0.1 In
06:00

WSW
WSW

 9 / 19 mph 57 / 55°F 88% 1004 mb
Low level cloud: 4%
Mid level cloud: 52%
High level cloud: 32%
Most Significant Cloud Type: medium
63%
0.3 In
12:00

SSW
SSW

 10 / 21 mph 67 / 67°F 46% 1015 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 8%
Most Significant Cloud Type: medium
73%
0.0 In
18:00

SW
SW

 15 / 32 mph 60 / 60°F 73% 1010 mb
Low level cloud: 56%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.0 In
Wed 10
Sep		00:00

WSW
WSW

 7 / 14 mph 59 / 59°F 91% 1014 mb
Low level cloud: 57%
Mid level cloud: 14%
High level cloud: 94%
Most Significant Cloud Type: low
73%
0.0 In
06:00

SW
SW

 12 / 26 mph 59 / 59°F 82% 1011 mb
Low level cloud: 42%
Mid level cloud: 64%
High level cloud: 13%
Most Significant Cloud Type: low
65%
0.0 In
12:00

WSW
WSW

 8 / 17 mph 68 / 68°F 40% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 77%
Most Significant Cloud Type: high
76%
0.0 In
18:00

SSW
SSW

 10 / 20 mph 65 / 65°F 64% 1012 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 100%
Most Significant Cloud Type: medium
31%
0.2 In
Thu 11
Sep		00:00

SSW
SSW

 7 / 15 mph 59 / 58°F 84% 1014 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 33%
Most Significant Cloud Type: medium
49%
0.0 In
06:00

S
S

 17 / 36 mph 59 / 55°F 83% 1004 mb
Low level cloud: 85%
Mid level cloud: 84%
High level cloud: 93%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 14 / 29 mph 64 / 64°F 89% 1007 mb
Low level cloud: 88%
Mid level cloud: 26%
High level cloud: 63%
Most Significant Cloud Type: low
100%
0.2 In
18:00

SSW
SSW

 12 / 26 mph 67 / 67°F 79% 1005 mb
Low level cloud: 21%
Mid level cloud: 1%
High level cloud: 22%
Most Significant Cloud Type: low
23%
0.4 In
Fri 12
Sep		00:00

WSW
WSW

 6 / 13 mph 63 / 63°F 85% 1008 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
0.1 In
06:00

SSW
SSW

 23 / 47 mph 58 / 53°F 86% 1002 mb
Low level cloud: 85%
Mid level cloud: 88%
High level cloud: 65%
Most Significant Cloud Type: low
100%
0.1 In
12:00

SSW
SSW

 18 / 37 mph 64 / 64°F 62% 1001 mb
Low level cloud: 78%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SW
SW

 13 / 28 mph 63 / 62°F 67% 1012 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
Sat 13
Sep		00:00

WNW
WNW

 19 / 40 mph 51 / 45°F 86% 998 mb
Low level cloud: 100%
Mid level cloud: 78%
High level cloud: 66%
Most Significant Cloud Type: low
100%
0.2 In
06:00

S
S

 5 / 10 mph 62 / 62°F 90% 1015 mb
Low level cloud: 15%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: low
19%
0.0 In
12:00

WNW
WNW

 21 / 43 mph 59 / 55°F 61% 1008 mb
Low level cloud: 4%
Mid level cloud: 100%
High level cloud: 96%
Most Significant Cloud Type: medium
100%
0.1 In
18:00

SSW
SSW

 7 / 14 mph 70 / 70°F 74% 1019 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: medium
23%
0.0 In
Sun 14
Sep		00:00

NW
NW

 12 / 26 mph 54 / 50°F 81% 1018 mb
Low level cloud: 43%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
46%
0.0 In
06:00

SSW
SSW

 1 / 3 mph 63 / 63°F 83% 1022 mb
Low level cloud: 1%
Mid level cloud: 50%
High level cloud: 93%
Most Significant Cloud Type: medium
55%
0.0 In
12:00

WNW
WNW

 13 / 26 mph 62 / 62°F 46% 1025 mb
Low level cloud: 49%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
91%
0.0 In
18:00

SW
SW

 8 / 17 mph 71 / 71°F 61% 1024 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
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