Fast Forecast

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

High Brotheridge 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for High Brotheridge

Gloucestershire, United Kingdom

Long range weather outlook for High Brotheridge includes 14 day forecast summary:

Over the next 14 days the High Brotheridge forecast suggests the average daytime maximum temperature will be around 21°C, with a high for the two weeks of 24°C expected on the afternoon of Monday 19th. The average minimum temperature will be 7°C, dipping to its lowest on the morning of Saturday 10th at 5°C. The coming 14 days will have mixed overhead conditions with some days dry and some seeing a significant amount of rain. Predictions are Sunday 11th will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 10
May		21:00

E
E

 6 / 13 mph 51 / 49°F 85% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 11
May		00:00

ENE
ENE

 7 / 14 mph 46 / 42°F 85% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 76%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 5 / 11 mph 43 / 40°F 91% 1014 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 36%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 5 / 9 mph 47 / 45°F 88% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 9 / 10 mph 63 / 62°F 66% 1012 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 11 / 13 mph 69 / 68°F 65% 1010 mb
Low level cloud: 70%
Mid level cloud: 11%
High level cloud: 16%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 9 / 13 mph 70 / 67°F 75% 1009 mb
Low level cloud: 39%
Mid level cloud: 33%
High level cloud: 100%
Most Significant Cloud Type: low
62%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SE
SE

 6 / 9 mph 66 / 64°F 86% 1009 mb
Low level cloud: 12%
Mid level cloud: 25%
High level cloud: 26%
Most Significant Cloud Type: low
23%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

S
S

 4 / 9 mph 54 / 54°F 94% 1009 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 31%
Most Significant Cloud Type: medium
59%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Mon 12
May		00:00

E
E

 2 / 4 mph 51 / 52°F 94% 1009 mb
Low level cloud: 16%
Mid level cloud: 27%
High level cloud: 5%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 3 / 6 mph 49 / 49°F 95% 1009 mb
Low level cloud: 26%
Mid level cloud: 42%
High level cloud: 32%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 5 / 8 mph 55 / 52°F 95% 1009 mb
Low level cloud: 28%
Mid level cloud: 54%
High level cloud: 1%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 9 / 10 mph 63 / 63°F 84% 1010 mb
Low level cloud: 80%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 12 / 15 mph 68 / 67°F 75% 1010 mb
Low level cloud: 56%
Mid level cloud: 17%
High level cloud: 9%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 12 / 17 mph 68 / 67°F 77% 1010 mb
Low level cloud: 56%
Mid level cloud: 23%
High level cloud: 14%
Most Significant Cloud Type: low
65%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SSE
SSE

 7 / 9 mph 66 / 64°F 84% 1012 mb
Low level cloud: 17%
Mid level cloud: 25%
High level cloud: 6%
Most Significant Cloud Type: low
26%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

ESE
ESE

 2 / 5 mph 54 / 54°F 90% 1014 mb
Low level cloud: 22%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 13
May		00:00

NE
NE

 5 / 11 mph 52 / 50°F 94% 1014 mb
Low level cloud: 6%
Mid level cloud: 44%
High level cloud: 16%
Most Significant Cloud Type: medium
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 7 / 15 mph 47 / 44°F 94% 1015 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 6%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 7 / 11 mph 50 / 47°F 94% 1017 mb
Low level cloud: 22%
Mid level cloud: 21%
High level cloud: 7%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 12 / 13 mph 62 / 61°F 75% 1018 mb
Low level cloud: 16%
Mid level cloud: 29%
High level cloud: 5%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 13 / 15 mph 68 / 67°F 65% 1018 mb
Low level cloud: 45%
Mid level cloud: 14%
High level cloud: 3%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 12 / 15 mph 67 / 67°F 74% 1017 mb
Low level cloud: 74%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 13 / 20 mph 64 / 63°F 76% 1018 mb
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 8 / 13 mph 54 / 52°F 86% 1020 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
Wed 14
May		00:00

NE
NE

 8 / 13 mph 48 / 44°F 92% 1021 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

NNE
NNE

 7 / 15 mph 42 / 37°F 93% 1021 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

NNE
NNE

 7 / 12 mph 46 / 41°F 90% 1022 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

 12 / 14 mph 61 / 60°F 68% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 13 / 15 mph 67 / 66°F 60% 1021 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 11 / 12 mph 71 / 68°F 58% 1021 mb
Low level cloud: 52%
Mid level cloud: 4%
High level cloud: 14%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 9 / 13 mph 66 / 64°F 71% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 8 / 17 mph 52 / 49°F 90% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 15
May		00:00

ENE
ENE

 5 / 10 mph 46 / 43°F 85% 1024 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 10%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 5 / 11 mph 43 / 40°F 81% 1025 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
06:00

N
N

 4 / 6 mph 46 / 44°F 79% 1026 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 95%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 7 / 8 mph 59 / 56°F 65% 1026 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 33%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 7 / 9 mph 67 / 65°F 55% 1026 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 89%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 6 / 7 mph 70 / 68°F 54% 1025 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 7%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 5 / 6 mph 70 / 68°F 71% 1025 mb
Low level cloud: 1%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 2 / 4 mph 60 / 60°F 76% 1026 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
Fri 16
May		00:00

ENE
ENE

 3 / 6 mph 50 / 49°F 86% 1027 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
03:00

NE
NE

 3 / 7 mph 46 / 44°F 89% 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
06:00

NNE
NNE

 4 / 6 mph 49 / 47°F 83% 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
09:00

NNE
NNE

 6 / 7 mph 62 / 60°F 58% 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
12:00

NE
NE

 6 / 8 mph 68 / 66°F 49% 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
15:00

ENE
ENE

 6 / 7 mph 71 / 69°F 50% 1027 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

E
E

 4 / 5 mph 71 / 69°F 70% 1027 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

E
E

 4 / 6 mph 61 / 61°F 82% 1027 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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 17
May		00:00

ENE
ENE

 5 / 11 mph 52 / 51°F 90% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NNE
NNE

 6 / 13 mph 50 / 48°F 85% 1026 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 21%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

ENE
ENE

 12 / 25 mph 67 / 67°F 61% 1025 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
18%
0.0 In
18:00

ENE
ENE

 6 / 13 mph 72 / 76°F 71% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 18
May		00:00

NNE
NNE

 9 / 19 mph 47 / 43°F 77% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
0.0 In
06:00

N
N

 6 / 13 mph 48 / 45°F 72% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NNE
NNE

 9 / 19 mph 68 / 68°F 52% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NE
NE

 7 / 15 mph 67 / 67°F 70% 1025 mb
Low level cloud: 10%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
Mon 19
May		00:00

SSE
SSE

 2 / 3 mph 55 / 55°F 82% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 53%
Most Significant Cloud Type: high
53%
0.0 In
06:00

NNE
NNE

 4 / 9 mph 51 / 50°F 88% 1027 mb
Low level cloud: 3%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.0 In
12:00

SW
SW

 5 / 11 mph 75 / 77°F 53% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

ENE
ENE

 5 / 11 mph 70 / 70°F 67% 1025 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: medium
5%
0.0 In
Tue 20
May		00:00

SW
SW

 4 / 9 mph 56 / 55°F 88% 1028 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 16%
Most Significant Cloud Type: medium
14%
0.0 In
06:00

NNE
NNE

 5 / 11 mph 52 / 51°F 84% 1027 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 15%
Most Significant Cloud Type: medium
21%
0.0 In
12:00

WSW
WSW

 13 / 27 mph 68 / 68°F 60% 1025 mb
Low level cloud: 11%
Mid level cloud: 47%
High level cloud: 21%
Most Significant Cloud Type: medium
79%
0.0 In
18:00

ENE
ENE

 6 / 13 mph 68 / 68°F 75% 1021 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
Wed 21
May		00:00

SW
SW

 11 / 23 mph 59 / 57°F 95% 1020 mb
Low level cloud: 75%
Mid level cloud: 23%
High level cloud: 8%
Most Significant Cloud Type: low
83%
0.0 In
06:00

N
N

 5 / 11 mph 54 / 53°F 92% 1019 mb
Low level cloud: 3%
Mid level cloud: 14%
High level cloud: 13%
Most Significant Cloud Type: medium
21%
0.0 In
12:00

SW
SW

 17 / 36 mph 69 / 69°F 72% 1015 mb
Low level cloud: 55%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
18:00

ENE
ENE

 4 / 10 mph 66 / 67°F 69% 1015 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.0 In
Thu 22
May		00:00

NW
NW

 9 / 19 mph 54 / 51°F 97% 1012 mb
Low level cloud: 86%
Mid level cloud: 62%
High level cloud: 88%
Most Significant Cloud Type: low
100%
0.4 In
06:00

NNE
NNE

 2 / 3 mph 57 / 57°F 76% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 18%
Most Significant Cloud Type: medium
5%
0.0 In
12:00

WNW
WNW

 7 / 15 mph 63 / 63°F 51% 1015 mb
Low level cloud: 20%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
20%
0.0 In
18:00

WSW
WSW

 11 / 22 mph 63 / 63°F 68% 1011 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 69%
Most Significant Cloud Type: medium
15%
0.0 In
Fri 23
May		00:00

W
W

 2 / 4 mph 49 / 49°F 84% 1013 mb
Low level cloud: 0%
Mid level cloud: 96%
High level cloud: 98%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

S
S

 8 / 16 mph 53 / 51°F 88% 1009 mb
Low level cloud: 94%
Mid level cloud: 89%
High level cloud: 25%
Most Significant Cloud Type: low
100%
0.0 In
12:00

S
S

 5 / 10 mph 62 / 62°F 52% 1008 mb
Low level cloud: 25%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

S
S

 14 / 29 mph 63 / 64°F 79% 1008 mb
Low level cloud: 57%
Mid level cloud: 60%
High level cloud: 32%
Most Significant Cloud Type: low
81%
0.0 In
Sat 24
May		00:00

NE
NE

 10 / 22 mph 48 / 44°F 96% 1009 mb
Low level cloud: 43%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
89%
0.1 In
06:00

SSE
SSE

 6 / 13 mph 55 / 54°F 92% 1008 mb
Low level cloud: 33%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
37%
0.0 In
12:00

NNE
NNE

 11 / 23 mph 60 / 60°F 49% 1012 mb
Low level cloud: 4%
Mid level cloud: 91%
High level cloud: 87%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

WSW
WSW

 9 / 19 mph 63 / 63°F 79% 1010 mb
Low level cloud: 40%
Mid level cloud: 44%
High level cloud: 93%
Most Significant Cloud Type: low
67%
0.0 In
Sun 25
May		00:00

WNW
WNW

 2 / 5 mph 47 / 47°F 88% 1014 mb
Low level cloud: 5%
Mid level cloud: 47%
High level cloud: 70%
Most Significant Cloud Type: medium
63%
0.0 In
06:00

NNE
NNE

 4 / 8 mph 59 / 59°F 91% 1013 mb
Low level cloud: 31%
Mid level cloud: 46%
High level cloud: 79%
Most Significant Cloud Type: low
56%
0.0 In
12:00

WSW
WSW

 10 / 22 mph 57 / 55°F 70% 1013 mb
Low level cloud: 40%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
86%
0.0 In
18:00

ENE
ENE

 6 / 12 mph 68 / 68°F 81% 1009 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 94%
Most Significant Cloud Type: medium
48%
0.0 In

The day label given represents the local day relative to the local time for the location you are looking at.
(More Info)

Day

This time is corrected for local time zones and where possible for daylight saving times.
(More Info)

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.
(More Info)

Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
(More Info)

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.
(More Info)

Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
(More Info)

Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
(More Info)

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.
(More Info)

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.
(More Info)

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.
(More Info)

Pressure