WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Acton Turville 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Acton Turville

South Gloucestershire, United Kingdom

Long range weather outlook for Acton Turville includes 14 day forecast summary:

Reviewing the forecast for Acton Turville Over the next 14 days and the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 20°C expected on the afternoon of Friday 17th. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Tuesday 21st at 4°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. The indicators are that Wednesday 22nd will have the most precipitation with an accumulation of around 24.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 15
May
18:00

SE
SE

9 / 12 mph 62 / 60°F 83% 1005 mb
Low level cloud: 11%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

6 / 13 mph 51 / 49°F 93% 1006 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
Thu 16
May
00:00

E
E

5 / 10 mph 49 / 47°F 93% 1006 mb
Low level cloud: 4%
Mid level cloud: 8%
High level cloud: 17%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

5 / 11 mph 46 / 44°F 94% 1006 mb
Low level cloud: 13%
Mid level cloud: 14%
High level cloud: 85%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

5 / 8 mph 52 / 49°F 94% 1006 mb
Low level cloud: 17%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

7 / 8 mph 60 / 58°F 84% 1006 mb
Low level cloud: 42%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

8 / 11 mph 59 / 59°F 86% 1006 mb
Low level cloud: 4%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

ENE
ENE

6 / 8 mph 57 / 56°F 91% 1006 mb
Low level cloud: 22%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

N
N

5 / 8 mph 56 / 55°F 93% 1006 mb
Low level cloud: 9%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: medium
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

3 / 5 mph 52 / 52°F 96% 1006 mb
Low level cloud: 44%
Mid level cloud: 45%
High level cloud: 90%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May
00:00

NW
NW

0 / 1 mph 50 / 49°F 96% 1007 mb
Low level cloud: 31%
Mid level cloud: 30%
High level cloud: 71%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

3 / 5 mph 49 / 49°F 95% 1007 mb
Low level cloud: 29%
Mid level cloud: 27%
High level cloud: 40%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

3 / 4 mph 54 / 53°F 94% 1008 mb
Low level cloud: 28%
Mid level cloud: 13%
High level cloud: 12%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

5 / 6 mph 62 / 60°F 81% 1009 mb
Low level cloud: 72%
Mid level cloud: 10%
High level cloud: 10%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

7 / 9 mph 66 / 64°F 71% 1009 mb
Low level cloud: 30%
Mid level cloud: 6%
High level cloud: 33%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

5 / 6 mph 68 / 65°F 68% 1010 mb
Low level cloud: 26%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

4 / 4 mph 66 / 63°F 85% 1011 mb
Low level cloud: 23%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

2 / 4 mph 54 / 54°F 90% 1012 mb
Low level cloud: 15%
Mid level cloud: 13%
High level cloud: 99%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

NW
NW

0 / 1 mph 51 / 51°F 92% 1013 mb
Low level cloud: 13%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

2 / 5 mph 49 / 49°F 93% 1013 mb
Low level cloud: 14%
Mid level cloud: 15%
High level cloud: 96%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

3 / 6 mph 55 / 53°F 93% 1014 mb
Low level cloud: 16%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

6 / 8 mph 62 / 61°F 86% 1014 mb
Low level cloud: 91%
Mid level cloud: 22%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

9 / 13 mph 65 / 64°F 80% 1014 mb
Low level cloud: 84%
Mid level cloud: 7%
High level cloud: 33%
Most Significant Cloud Type: low
90%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NNE
NNE

9 / 11 mph 65 / 65°F 80% 1014 mb
Low level cloud: 84%
Mid level cloud: 9%
High level cloud: 55%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

8 / 11 mph 65 / 62°F 89% 1014 mb
Low level cloud: 3%
Mid level cloud: 18%
High level cloud: 2%
Most Significant Cloud Type: medium
28%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNE
NNE

6 / 13 mph 53 / 52°F 95% 1015 mb
Low level cloud: 42%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NNE
NNE

5 / 10 mph 53 / 51°F 97% 1016 mb
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

5 / 9 mph 52 / 51°F 98% 1015 mb
Low level cloud: 72%
Mid level cloud: 28%
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 / 10 mph 53 / 51°F 96% 1016 mb
Low level cloud: 85%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

11 / 13 mph 56 / 53°F 91% 1017 mb
Low level cloud: 97%
Mid level cloud: 23%
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

NE
NE

12 / 14 mph 59 / 56°F 86% 1017 mb
Low level cloud: 92%
Mid level cloud: 13%
High level cloud: 9%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

13 / 15 mph 62 / 61°F 78% 1016 mb
Low level cloud: 83%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

12 / 17 mph 60 / 56°F 87% 1016 mb
Low level cloud: 32%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

8 / 14 mph 53 / 49°F 96% 1018 mb
Low level cloud: 47%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NE
NE

10 / 16 mph 47 / 42°F 97% 1019 mb
Low level cloud: 73%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

11 / 15 mph 46 / 41°F 94% 1019 mb
Low level cloud: 86%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

11 / 15 mph 47 / 42°F 92% 1019 mb
Low level cloud: 95%
Mid level cloud: 6%
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

NE
NE

13 / 15 mph 53 / 49°F 78% 1019 mb
Low level cloud: 93%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

11 / 13 mph 60 / 57°F 69% 1018 mb
Low level cloud: 78%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

10 / 12 mph 61 / 60°F 69% 1017 mb
Low level cloud: 34%
Mid level cloud: 13%
High level cloud: 2%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

9 / 12 mph 59 / 56°F 78% 1017 mb
Low level cloud: 8%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

7 / 13 mph 49 / 46°F 91% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 13%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

ENE
ENE

6 / 12 mph 43 / 39°F 94% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 4%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

5 / 11 mph 39 / 35°F 95% 1017 mb
Low level cloud: 13%
Mid level cloud: 45%
High level cloud: 86%
Most Significant Cloud Type: medium
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

7 / 9 mph 44 / 40°F 95% 1016 mb
Low level cloud: 73%
Mid level cloud: 46%
High level cloud: 48%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

8 / 9 mph 55 / 51°F 76% 1015 mb
Low level cloud: 7%
Mid level cloud: 44%
High level cloud: 20%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

8 / 9 mph 63 / 61°F 68% 1014 mb
Low level cloud: 47%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

7 / 9 mph 63 / 61°F 80% 1013 mb
Low level cloud: 57%
Mid level cloud: 33%
High level cloud: 7%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

6 / 10 mph 64 / 61°F 90% 1012 mb
Low level cloud: 35%
Mid level cloud: 37%
High level cloud: 1%
Most Significant Cloud Type: low
48%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NE
NE

7 / 14 mph 54 / 50°F 97% 1013 mb
Low level cloud: 60%
Mid level cloud: 29%
High level cloud: 8%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 22
May
00:00

WSW
WSW

8 / 16 mph 51 / 48°F 98% 1010 mb
Low level cloud: 53%
Mid level cloud: 44%
High level cloud: 37%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

6 / 13 mph 52 / 49°F 95% 1012 mb
Low level cloud: 86%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNW
NNW

8 / 17 mph 56 / 54°F 96% 1011 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 38%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNE
NNE

7 / 15 mph 61 / 61°F 89% 1013 mb
Low level cloud: 56%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
72%
0.0 In
Thu 23
May
00:00

NNE
NNE

4 / 9 mph 53 / 52°F 97% 1013 mb
Low level cloud: 60%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
06:00

S
S

5 / 11 mph 56 / 55°F 94% 1021 mb
Low level cloud: 17%
Mid level cloud: 10%
High level cloud: 3%
Most Significant Cloud Type: low
20%
0.0 In
12:00

NNW
NNW

16 / 33 mph 52 / 47°F 96% 1021 mb
Low level cloud: 88%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

E
E

7 / 14 mph 61 / 61°F 94% 1017 mb
Low level cloud: 87%
Mid level cloud: 26%
High level cloud: 21%
Most Significant Cloud Type: low
99%
0.0 In
Fri 24
May
00:00

NNE
NNE

15 / 32 mph 52 / 47°F 97% 1019 mb
Low level cloud: 98%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.6 In
06:00

NNE
NNE

9 / 18 mph 49 / 45°F 95% 1019 mb
Low level cloud: 32%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
32%
0.0 In
12:00

ESE
ESE

8 / 16 mph 61 / 61°F 86% 1021 mb
Low level cloud: 91%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.0 In
18:00

NE
NE

12 / 24 mph 63 / 63°F 83% 1018 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 25
May
00:00

SSE
SSE

4 / 8 mph 55 / 55°F 94% 1021 mb
Low level cloud: 4%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
06:00

NNE
NNE

6 / 12 mph 52 / 50°F 92% 1020 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
12%
0.0 In
12:00

SSW
SSW

9 / 18 mph 64 / 64°F 75% 1019 mb
Low level cloud: 79%
Mid level cloud: 0%
High level cloud: 97%
Most Significant Cloud Type: low
90%
0.0 In
18:00

NNW
NNW

3 / 6 mph 70 / 70°F 79% 1017 mb
Low level cloud: 19%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: low
27%
0.0 In
Sun 26
May
00:00

ENE
ENE

1 / 2 mph 56 / 56°F 91% 1019 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 12%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

N
N

5 / 10 mph 57 / 56°F 91% 1017 mb
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
12:00

ENE
ENE

12 / 25 mph 69 / 69°F 85% 1017 mb
Low level cloud: 96%
Mid level cloud: 14%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NW
NW

6 / 14 mph 64 / 64°F 86% 1017 mb
Low level cloud: 29%
Mid level cloud: 43%
High level cloud: 69%
Most Significant Cloud Type: low
52%
0.0 In
Mon 27
May
00:00

NE
NE

13 / 26 mph 57 / 54°F 97% 1017 mb
Low level cloud: 56%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: low
57%
0.1 In
06:00

NNW
NNW

8 / 16 mph 51 / 48°F 86% 1019 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 91%
Most Significant Cloud Type: low
27%
0.0 In
12:00

NE
NE

19 / 40 mph 63 / 63°F 66% 1017 mb
Low level cloud: 45%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.0 In
18:00

NW
NW

9 / 18 mph 62 / 62°F 80% 1019 mb
Low level cloud: 75%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
78%
0.0 In
Tue 28
May
00:00

N
N

15 / 30 mph 52 / 47°F 84% 1012 mb
Low level cloud: 12%
Mid level cloud: 45%
High level cloud: 58%
Most Significant Cloud Type: medium
80%
0.0 In
06:00

N
N

8 / 16 mph 50 / 47°F 84% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

NNE
NNE

13 / 28 mph 58 / 55°F 86% 1006 mb
Low level cloud: 84%
Mid level cloud: 23%
High level cloud: 88%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NW
NW

9 / 19 mph 58 / 56°F 78% 1021 mb
Low level cloud: 68%
Mid level cloud: 9%
High level cloud: 33%
Most Significant Cloud Type: low
74%
0.0 In
Wed 29
May
00:00

ENE
ENE

3 / 6 mph 55 / 55°F 97% 1007 mb
Low level cloud: 49%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
65%
0.1 In
06:00

WSW
WSW

6 / 13 mph 51 / 49°F 93% 1020 mb
Low level cloud: 28%
Mid level cloud: 4%
High level cloud: 48%
Most Significant Cloud Type: low
34%
0.0 In
12:00

ESE
ESE

3 / 6 mph 61 / 61°F 93% 1006 mb
Low level cloud: 88%
Mid level cloud: 30%
High level cloud: 85%
Most Significant Cloud Type: low
100%
0.2 In
18:00

W
W

14 / 30 mph 55 / 51°F 77% 1017 mb
Low level cloud: 0%
Mid level cloud: 92%
High level cloud: 97%
Most Significant Cloud Type: medium
95%
0.0 In
Thu 30
May
00:00

S
S

3 / 7 mph 57 / 58°F 93% 1008 mb
Low level cloud: 2%
Mid level cloud: 17%
High level cloud: 3%
Most Significant Cloud Type: medium
22%
0.0 In
06:00

WSW
WSW

9 / 20 mph 54 / 51°F 93% 1015 mb
Low level cloud: 79%
Mid level cloud: 28%
High level cloud: 16%
Most Significant Cloud Type: low
91%
0.0 In
12:00

SW
SW

4 / 9 mph 60 / 60°F 90% 1007 mb
Low level cloud: 13%
Mid level cloud: 79%
High level cloud: 81%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

W
W

10 / 21 mph 59 / 59°F 84% 1014 mb
Low level cloud: 40%
Mid level cloud: 9%
High level cloud: 12%
Most Significant Cloud Type: low
44%
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