Weather2 on Twitter Weather2 on Facebook Weather2 on YouTube Weather2 blog

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Brighstone 14 Day Long Range Forecast

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

Hampshire, United Kingdom

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

The outlook for Brighstone in the two weeks ahead shows the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 21°C expected on the evening of Friday 20th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Friday 27th at 7°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. The indicators are that Sunday 22nd will have the most precipitation with an accumulation of around 3.0mm. On the whole winds are likely to be moderate. The forecast suggests the strongest wind will be on the morning of Monday 30th, coming from a westerly direction, and reaching around 31mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 20
Apr
18:00

W
W

5 / 7 mph 70 / 68°F 77% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NNW
NNW

3 / 3 mph 68 / 68°F 85% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 70%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sat 21
Apr
00:00

NE
NE

5 / 8 mph 64 / 64°F 87% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 33%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

ENE
ENE

7 / 13 mph 60 / 60°F 90% 1022 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 13%
Most Significant Cloud Type: low
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

E
E

9 / 16 mph 58 / 55°F 92% 1022 mb
Low level cloud: 13%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: low
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

ESE
ESE

9 / 13 mph 62 / 61°F 81% 1022 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 11%
Most Significant Cloud Type: medium
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

ESE
ESE

11 / 13 mph 67 / 65°F 77% 1020 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 93%
Most Significant Cloud Type: medium
20%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

ESE
ESE

12 / 13 mph 69 / 68°F 79% 1018 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 93%
Most Significant Cloud Type: medium
48%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

ESE
ESE

13 / 15 mph 67 / 66°F 83% 1016 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 83%
Most Significant Cloud Type: medium
19%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
21:00

SE
SE

12 / 22 mph 62 / 62°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 87%
Most Significant Cloud Type: medium
24%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
Sun 22
Apr
00:00

SSW
SSW

9 / 14 mph 64 / 64°F 87% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 80%
Most Significant Cloud Type: medium
49%
Expect 0.09 In of precipitation over the past 3 hours.
0.09 In
03:00

WSW
WSW

12 / 16 mph 61 / 62°F 90% 1013 mb
Low level cloud: 4%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
06:00

WSW
WSW

12 / 21 mph 56 / 52°F 92% 1013 mb
Low level cloud: 17%
Mid level cloud: 6%
High level cloud: 78%
Most Significant Cloud Type: low
27%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

SW
SW

12 / 20 mph 55 / 51°F 89% 1013 mb
Low level cloud: 8%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: low
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

12 / 22 mph 55 / 51°F 87% 1013 mb
Low level cloud: 9%
Mid level cloud: 8%
High level cloud: 33%
Most Significant Cloud Type: low
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WSW
WSW

13 / 23 mph 55 / 51°F 90% 1013 mb
Low level cloud: 21%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
40%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WSW
WSW

15 / 27 mph 55 / 51°F 82% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 1%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

11 / 20 mph 54 / 50°F 90% 1016 mb
Low level cloud: 33%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 23
Apr
00:00

W
W

10 / 15 mph 53 / 49°F 91% 1016 mb
Low level cloud: 72%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

13 / 21 mph 51 / 46°F 92% 1016 mb
Low level cloud: 86%
Mid level cloud: 0%
High level cloud: 55%
Most Significant Cloud Type: low
92%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

12 / 20 mph 50 / 45°F 91% 1017 mb
Low level cloud: 76%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: low
78%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WNW
WNW

11 / 15 mph 53 / 49°F 79% 1019 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

W
W

14 / 16 mph 56 / 52°F 75% 1020 mb
Low level cloud: 4%
Mid level cloud: 2%
High level cloud: 44%
Most Significant Cloud Type: medium
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WSW
WSW

19 / 22 mph 57 / 53°F 80% 1020 mb
Low level cloud: 4%
Mid level cloud: 4%
High level cloud: 95%
Most Significant Cloud Type: medium
19%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WSW
WSW

18 / 21 mph 56 / 51°F 84% 1020 mb
Low level cloud: 1%
Mid level cloud: 18%
High level cloud: 96%
Most Significant Cloud Type: medium
25%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WSW
WSW

19 / 25 mph 53 / 48°F 86% 1020 mb
Low level cloud: 29%
Mid level cloud: 28%
High level cloud: 98%
Most Significant Cloud Type: low
50%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Tue 24
Apr
00:00

WSW
WSW

20 / 27 mph 53 / 48°F 89% 1019 mb
Low level cloud: 19%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
41%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WSW
WSW

19 / 31 mph 52 / 46°F 93% 1018 mb
Low level cloud: 90%
Mid level cloud: 27%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WSW
WSW

18 / 33 mph 50 / 44°F 95% 1018 mb
Low level cloud: 88%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WSW
WSW

17 / 25 mph 54 / 49°F 95% 1018 mb
Low level cloud: 93%
Mid level cloud: 77%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

20 / 23 mph 57 / 53°F 93% 1017 mb
Low level cloud: 85%
Mid level cloud: 29%
High level cloud: 86%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

SW
SW

21 / 24 mph 59 / 55°F 93% 1015 mb
Low level cloud: 65%
Mid level cloud: 45%
High level cloud: 78%
Most Significant Cloud Type: low
90%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WSW
WSW

21 / 24 mph 57 / 53°F 94% 1014 mb
Low level cloud: 80%
Mid level cloud: 54%
High level cloud: 63%
Most Significant Cloud Type: low
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WSW
WSW

19 / 24 mph 55 / 50°F 96% 1015 mb
Low level cloud: 80%
Mid level cloud: 98%
High level cloud: 55%
Most Significant Cloud Type: low
100%
Expect 0.03 In of precipitation over the past 3 hours.
0.03 In
Wed 25
Apr
00:00

WNW
WNW

13 / 26 mph 48 / 42°F 94% 1015 mb
Low level cloud: 51%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
03:00

NW
NW

14 / 22 mph 47 / 41°F 88% 1016 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

15 / 27 mph 46 / 40°F 88% 1017 mb
Low level cloud: 61%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
61%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

19 / 35 mph 48 / 41°F 82% 1019 mb
Low level cloud: 62%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

W
W

20 / 39 mph 50 / 43°F 74% 1019 mb
Low level cloud: 2%
Mid level cloud: 19%
High level cloud: 7%
Most Significant Cloud Type: medium
24%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WSW
WSW

22 / 42 mph 51 / 44°F 73% 1019 mb
Low level cloud: 11%
Mid level cloud: 22%
High level cloud: 1%
Most Significant Cloud Type: low
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

W
W

18 / 36 mph 50 / 44°F 73% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

16 / 31 mph 48 / 42°F 74% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 26
Apr
00:00

W
W

18 / 30 mph 48 / 42°F 73% 1022 mb
Low level cloud: 0%
Mid level cloud: 68%
High level cloud: 9%
Most Significant Cloud Type: medium
68%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

18 / 32 mph 47 / 40°F 74% 1021 mb
Low level cloud: 4%
Mid level cloud: 45%
High level cloud: 12%
Most Significant Cloud Type: medium
55%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

18 / 33 mph 47 / 39°F 76% 1022 mb
Low level cloud: 18%
Mid level cloud: 30%
High level cloud: 15%
Most Significant Cloud Type: low
30%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

18 / 30 mph 49 / 42°F 74% 1023 mb
Low level cloud: 36%
Mid level cloud: 24%
High level cloud: 2%
Most Significant Cloud Type: low
44%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

W
W

19 / 29 mph 51 / 45°F 76% 1023 mb
Low level cloud: 20%
Mid level cloud: 17%
High level cloud: 3%
Most Significant Cloud Type: low
26%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
15:00

W
W

18 / 31 mph 52 / 46°F 68% 1023 mb
Low level cloud: 7%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: low
12%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

WNW
WNW

14 / 24 mph 52 / 46°F 69% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WNW
WNW

17 / 25 mph 49 / 43°F 67% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 27
Apr
00:00

WSW
WSW

19 / 40 mph 46 / 38°F 88% 1016 mb
Low level cloud: 91%
Mid level cloud: 43%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.00 In
06:00

W
W

12 / 21 mph 46 / 40°F 78% 1015 mb
Low level cloud: 7%
Mid level cloud: 17%
High level cloud: 10%
Most Significant Cloud Type: low
13%
0.00 In
12:00

SW
SW

11 / 13 mph 51 / 47°F 65% 1026 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 11%
Most Significant Cloud Type: medium
20%
0.00 In
18:00

SW
SW

15 / 23 mph 51 / 47°F 95% 1017 mb
Low level cloud: 90%
Mid level cloud: 69%
High level cloud: 85%
Most Significant Cloud Type: low
100%
0.01 In
Sat 28
Apr
00:00

WNW
WNW

5 / 7 mph 48 / 46°F 78% 1017 mb
Low level cloud: 13%
Mid level cloud: 49%
High level cloud: 77%
Most Significant Cloud Type: medium
89%
0.00 In
06:00

SW
SW

23 / 49 mph 48 / 41°F 94% 1013 mb
Low level cloud: 91%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.02 In
12:00

SW
SW

15 / 17 mph 52 / 47°F 71% 1012 mb
Low level cloud: 4%
Mid level cloud: 90%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.00 In
18:00

W
W

26 / 30 mph 52 / 45°F 76% 1011 mb
Low level cloud: 91%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.01 In
Sun 29
Apr
00:00

WNW
WNW

15 / 26 mph 46 / 39°F 79% 1007 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 33%
Most Significant Cloud Type: medium
10%
0.03 In
06:00

WNW
WNW

24 / 39 mph 45 / 36°F 78% 1014 mb
Low level cloud: 46%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.00 In
12:00

WNW
WNW

13 / 19 mph 50 / 45°F 70% 1007 mb
Low level cloud: 10%
Mid level cloud: 13%
High level cloud: 1%
Most Significant Cloud Type: low
14%
0.03 In
18:00

WSW
WSW

17 / 28 mph 50 / 45°F 76% 1014 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 40%
Most Significant Cloud Type: medium
46%
0.02 In
Mon 30
Apr
00:00

WNW
WNW

14 / 23 mph 44 / 38°F 79% 1007 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.06 In
06:00

SSW
SSW

18 / 23 mph 50 / 44°F 81% 1007 mb
Low level cloud: 23%
Mid level cloud: 52%
High level cloud: 33%
Most Significant Cloud Type: low
45%
0.04 In
12:00

W
W

5 / 9 mph 50 / 47°F 64% 1005 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
0.12 In
18:00

S
S

22 / 34 mph 56 / 51°F 81% 998 mb
Low level cloud: 17%
Mid level cloud: 46%
High level cloud: 43%
Most Significant Cloud Type: low
38%
0.11 In
Tue 01
May
00:00

NNW
NNW

16 / 23 mph 45 / 38°F 86% 1005 mb
Low level cloud: 12%
Mid level cloud: 28%
High level cloud: 3%
Most Significant Cloud Type: low
22%
0.05 In
06:00

SSW
SSW

20 / 36 mph 47 / 40°F 73% 996 mb
Low level cloud: 7%
Mid level cloud: 6%
High level cloud: 66%
Most Significant Cloud Type: medium
26%
0.16 In
12:00

N
N

17 / 36 mph 44 / 36°F 73% 1012 mb
Low level cloud: 52%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.00 In
18:00

SSW
SSW

20 / 30 mph 51 / 44°F 73% 996 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: medium
45%
0.05 In
Wed 02
May
00:00

NNE
NNE

16 / 27 mph 44 / 36°F 84% 1020 mb
Low level cloud: 9%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.12 In
06:00

SSW
SSW

20 / 40 mph 46 / 39°F 78% 997 mb
Low level cloud: 14%
Mid level cloud: 4%
High level cloud: 22%
Most Significant Cloud Type: low
17%
0.01 In
12:00

NE
NE

7 / 15 mph 44 / 40°F 63% 1025 mb
Low level cloud: 47%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.00 In
18:00

SSW
SSW

15 / 26 mph 50 / 45°F 75% 1001 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 48%
Most Significant Cloud Type: medium
46%
0.03 In
Thu 03
May
00:00

W
W

8 / 10 mph 50 / 47°F 73% 1028 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.00 In
06:00

SSW
SSW

23 / 40 mph 49 / 42°F 79% 1004 mb
Low level cloud: 37%
Mid level cloud: 28%
High level cloud: 40%
Most Significant Cloud Type: low
51%
0.08 In
12:00

W
W

11 / 20 mph 49 / 45°F 76% 1029 mb
Low level cloud: 44%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
60%
0.00 In
18:00

SW
SW

11 / 21 mph 51 / 47°F 79% 1008 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 38%
Most Significant Cloud Type: medium
47%
0.08 In
Fri 04
May
00:00

N
N

16 / 29 mph 49 / 43°F 88% 1031 mb
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 10%
Most Significant Cloud Type: medium
13%
0.01 In
06:00

ENE
ENE

7 / 9 mph 54 / 52°F 83% 1010 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 17%
Most Significant Cloud Type: medium
21%
0.00 In
12:00

NNE
NNE

16 / 28 mph 51 / 46°F 66% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
18:00

ENE
ENE

16 / 26 mph 60 / 60°F 80% 1007 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 33%
Most Significant Cloud Type: medium
7%
0.00 In
Sat 05
May
00:00

NNE
NNE

22 / 39 mph 46 / 38°F 81% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
11%
0.00 In
06:00

ENE
ENE

15 / 32 mph 46 / 39°F 95% 1007 mb
Low level cloud: 82%
Mid level cloud: 48%
High level cloud: 38%
Most Significant Cloud Type: low
100%
0.24 In
12:00

NE
NE

26 / 30 mph 60 / 60°F 67% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 47%
Most Significant Cloud Type: high
47%
0.00 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