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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:

Over the next 14 days the Chaldon forecast suggests the average daytime maximum temperature will be around 4°C, with a high for the two weeks of 12°C expected on the morning of Monday 6th. The mean minimum temperature will be 1°C, dipping to its lowest on the morning of Thursday 9th at -1°C. The next 14 days will have some days seeing a little precipitation and some days with rain, sleet or snow. The current forecast indicates Wednesday 8th will have the most precipitation with an accumulation of around 8.0mm. On the whole winds are likely to be light. The strongest wind will be felt on the morning of Monday 6th, coming from a southerly direction, and reaching around 26mph.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 06
Jan		18:00

WSW
WSW

 11 / 13 mph 41 / 35°F 84% 991 mb
Low level cloud: 13%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: medium
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 10 / 13 mph 39 / 33°F 83% 993 mb
Low level cloud: 0%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 07
Jan		00:00

W
W

 12 / 19 mph 36 / 27°F 84% 995 mb
Low level cloud: 69%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

 12 / 22 mph 35 / 26°F 82% 998 mb
Low level cloud: 8%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 9 / 16 mph 34 / 26°F 77% 998 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 13 / 19 mph 36 / 27°F 93% 998 mb
Low level cloud: 99%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 12 / 17 mph 38 / 30°F 82% 1000 mb
Low level cloud: 54%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 9 / 13 mph 39 / 33°F 79% 1001 mb
Low level cloud: 15%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 10 / 11 mph 39 / 32°F 88% 1003 mb
Low level cloud: 16%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 9 / 10 mph 38 / 32°F 87% 1005 mb
Low level cloud: 1%
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
Wed 08
Jan		00:00

WSW
WSW

 7 / 11 mph 35 / 28°F 83% 1006 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 5 / 10 mph 32 / 27°F 83% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 4 / 8 mph 31 / 27°F 83% 1005 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 2 / 3 mph 32 / 33°F 77% 1005 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 96%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 6 / 9 mph 35 / 29°F 81% 1003 mb
Low level cloud: 13%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 9 / 11 mph 36 / 29°F 96% 999 mb
Low level cloud: 84%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

ENE
ENE

 10 / 11 mph 35 / 28°F 99% 998 mb
Low level cloud: 92%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
21:00

NE
NE

 9 / 13 mph 33 / 26°F 98% 998 mb
Low level cloud: 95%
Mid level cloud: 100%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 09
Jan		00:00

NE
NE

 7 / 12 mph 32 / 26°F 99% 999 mb
Low level cloud: 97%
Mid level cloud: 98%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 8 / 14 mph 31 / 24°F 98% 1000 mb
Low level cloud: 86%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 7 / 15 mph 30 / 23°F 93% 1002 mb
Low level cloud: 20%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 8 / 12 mph 32 / 25°F 89% 1006 mb
Low level cloud: 9%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 6 / 9 mph 35 / 29°F 82% 1009 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

 6 / 8 mph 36 / 30°F 82% 1010 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 5 / 6 mph 36 / 31°F 92% 1013 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 4 / 6 mph 33 / 30°F 90% 1014 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 83%
Most Significant Cloud Type: high
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 10
Jan		00:00

W
W

 2 / 4 mph 32 / 31°F 89% 1015 mb
Low level cloud: 0%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: medium
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

 2 / 4 mph 31 / 30°F 89% 1015 mb
Low level cloud: 0%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: medium
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 4 / 7 mph 30 / 27°F 92% 1013 mb
Low level cloud: 29%
Mid level cloud: 54%
High level cloud: 19%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

 4 / 7 mph 31 / 27°F 94% 1014 mb
Low level cloud: 44%
Mid level cloud: 100%
High level cloud: 4%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 6 / 9 mph 33 / 28°F 97% 1015 mb
Low level cloud: 85%
Mid level cloud: 49%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 6 / 9 mph 34 / 29°F 95% 1016 mb
Low level cloud: 84%
Mid level cloud: 44%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 5 / 8 mph 34 / 29°F 93% 1018 mb
Low level cloud: 54%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 4 / 7 mph 32 / 29°F 90% 1021 mb
Low level cloud: 2%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 11
Jan		00:00

N
N

 3 / 5 mph 32 / 30°F 89% 1024 mb
Low level cloud: 1%
Mid level cloud: 99%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 4 / 7 mph 31 / 28°F 92% 1026 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
06:00

N
N

 3 / 7 mph 30 / 27°F 92% 1029 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
09:00

N
N

 3 / 6 mph 33 / 29°F 91% 1032 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
12:00

NNE
NNE

 3 / 4 mph 36 / 34°F 88% 1034 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

N
N

 2 / 4 mph 37 / 36°F 90% 1036 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
18:00

NNE
NNE

 2 / 3 mph 37 / 36°F 92% 1038 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
21:00

ENE
ENE

 2 / 3 mph 36 / 35°F 92% 1040 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
Sun 12
Jan		00:00

ENE
ENE

 2 / 4 mph 33 / 32°F 91% 1041 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
03:00

SE
SE

 2 / 4 mph 33 / 32°F 89% 1041 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
06:00

ESE
ESE

 3 / 6 mph 31 / 29°F 90% 1043 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
09:00

SSE
SSE

 2 / 5 mph 33 / 31°F 92% 1044 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 4 / 6 mph 36 / 33°F 90% 1044 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 4 / 7 mph 38 / 34°F 94% 1043 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 5 / 8 mph 37 / 32°F 92% 1044 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
21:00

SSE
SSE

 5 / 8 mph 35 / 31°F 84% 1044 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 13
Jan		00:00

N
N

 4 / 6 mph 38 / 34°F 80% 1043 mb
Low level cloud: 100%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
06:00

N
N

 5 / 8 mph 39 / 35°F 90% 1043 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
8%
0.0 In
12:00

SW
SW

 5 / 7 mph 45 / 42°F 96% 1029 mb
Low level cloud: 99%
Mid level cloud: 57%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NE
NE

 6 / 8 mph 46 / 43°F 80% 1039 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Tue 14
Jan		00:00

ESE
ESE

 7 / 10 mph 34 / 28°F 77% 1029 mb
Low level cloud: 16%
Mid level cloud: 100%
High level cloud: 19%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

SSW
SSW

 5 / 7 mph 42 / 38°F 81% 1032 mb
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
0.0 In
12:00

ENE
ENE

 12 / 18 mph 38 / 30°F 74% 1031 mb
Low level cloud: 61%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: low
63%
0.0 In
18:00

SW
SW

 7 / 9 mph 55 / 53°F 87% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Wed 15
Jan		00:00

SW
SW

 4 / 5 mph 43 / 40°F 84% 1033 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

WSW
WSW

 4 / 6 mph 45 / 43°F 97% 1034 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: low
40%
0.0 In
12:00

SW
SW

 3 / 4 mph 46 / 45°F 79% 1034 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

W
W

 1 / 2 mph 60 / 60°F 94% 1037 mb
Low level cloud: 20%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
20%
0.0 In
Thu 16
Jan		00:00

SW
SW

 3 / 4 mph 41 / 40°F 96% 1035 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
06:00

SSW
SSW

 1 / 1 mph 49 / 49°F 94% 1038 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: low
17%
0.0 In
12:00

SSE
SSE

 2 / 3 mph 48 / 49°F 86% 1033 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
16%
0.0 In
18:00

S
S

 4 / 5 mph 52 / 51°F 96% 1036 mb
Low level cloud: 48%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.0 In
Fri 17
Jan		00:00

ESE
ESE

 4 / 5 mph 44 / 42°F 83% 1030 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 5%
Most Significant Cloud Type: medium
27%
0.0 In
06:00

SW
SW

 4 / 5 mph 41 / 39°F 95% 1034 mb
Low level cloud: 44%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.0 In
12:00

ESE
ESE

 3 / 4 mph 46 / 45°F 88% 1027 mb
Low level cloud: 30%
Mid level cloud: 46%
High level cloud: 28%
Most Significant Cloud Type: low
49%
0.0 In
18:00

WSW
WSW

 3 / 4 mph 57 / 57°F 94% 1031 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
Sat 18
Jan		00:00

WSW
WSW

 1 / 2 mph 43 / 43°F 99% 1025 mb
Low level cloud: 99%
Mid level cloud: 61%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SW
SW

 4 / 5 mph 45 / 43°F 93% 1027 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
0.0 In
12:00

SE
SE

 2 / 3 mph 45 / 46°F 93% 1024 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

 7 / 9 mph 48 / 45°F 88% 1023 mb
Low level cloud: 2%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
Sun 19
Jan		00:00

SE
SE

 6 / 9 mph 45 / 42°F 95% 1020 mb
Low level cloud: 61%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
95%
0.0 In
06:00

SW
SW

 5 / 7 mph 44 / 41°F 97% 1025 mb
Low level cloud: 42%
Mid level cloud: 5%
High level cloud: 13%
Most Significant Cloud Type: low
44%
0.0 In
12:00

SE
SE

 10 / 16 mph 46 / 40°F 97% 1017 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.1 In
18:00

WSW
WSW

 4 / 5 mph 57 / 57°F 88% 1028 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
2%
0.0 In
Mon 20
Jan		00:00

S
S

 3 / 3 mph 49 / 48°F 98% 1017 mb
Low level cloud: 83%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.2 In
06:00

SW
SW

 3 / 4 mph 48 / 47°F 90% 1029 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
12:00

NW
NW

 5 / 6 mph 48 / 46°F 85% 1020 mb
Low level cloud: 43%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.0 In
18:00

S
S

 4 / 5 mph 54 / 53°F 92% 1026 mb
Low level cloud: 2%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
Tue 21
Jan		00:00

SSE
SSE

 2 / 2 mph 49 / 50°F 91% 1022 mb
Low level cloud: 26%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
06:00

SE
SE

 5 / 6 mph 45 / 42°F 95% 1021 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
12:00

SSE
SSE

 7 / 9 mph 47 / 44°F 86% 1022 mb
Low level cloud: 13%
Mid level cloud: 100%
High level cloud: 22%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

SE
SE

 8 / 10 mph 52 / 49°F 88% 1016 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
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