WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Flaxpool 14 Day Long Range Forecast

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

Somerset, United Kingdom

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

The outlook for Flaxpool in the two weeks ahead shows the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 18°C expected on the evening of Sunday 19th. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Monday 27th at 7°C. The coming 14 days will have most days seeing a little rain. The current forecast indicates Wednesday 22nd will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May
18:00

SSE
SSE

2 / 3 mph 63 / 60°F 84% 1011 mb
Low level cloud: 7%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

3 / 4 mph 59 / 58°F 89% 1013 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

WNW
WNW

4 / 8 mph 55 / 55°F 88% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

4 / 9 mph 54 / 54°F 88% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 10%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

4 / 7 mph 55 / 54°F 92% 1014 mb
Low level cloud: 17%
Mid level cloud: 63%
High level cloud: 12%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

6 / 9 mph 57 / 55°F 92% 1014 mb
Low level cloud: 86%
Mid level cloud: 44%
High level cloud: 85%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

6 / 10 mph 60 / 58°F 87% 1014 mb
Low level cloud: 56%
Mid level cloud: 45%
High level cloud: 52%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

6 / 10 mph 60 / 58°F 92% 1014 mb
Low level cloud: 67%
Mid level cloud: 45%
High level cloud: 61%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

5 / 9 mph 60 / 59°F 92% 1014 mb
Low level cloud: 79%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

4 / 8 mph 62 / 59°F 92% 1015 mb
Low level cloud: 30%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NNE
NNE

8 / 14 mph 56 / 54°F 95% 1015 mb
Low level cloud: 24%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

9 / 15 mph 52 / 49°F 95% 1015 mb
Low level cloud: 21%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

10 / 15 mph 52 / 47°F 94% 1017 mb
Low level cloud: 40%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

11 / 16 mph 56 / 52°F 86% 1017 mb
Low level cloud: 10%
Mid level cloud: 0%
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

NE
NE

11 / 16 mph 61 / 60°F 77% 1017 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

10 / 17 mph 63 / 62°F 71% 1016 mb
Low level cloud: 23%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

9 / 15 mph 64 / 62°F 80% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

6 / 8 mph 63 / 60°F 89% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NE
NE

6 / 9 mph 56 / 55°F 92% 1016 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

NE
NE

8 / 11 mph 52 / 49°F 89% 1016 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

NE
NE

9 / 13 mph 49 / 45°F 92% 1016 mb
Low level cloud: 19%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

13 / 18 mph 55 / 50°F 85% 1015 mb
Low level cloud: 43%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

11 / 17 mph 60 / 57°F 76% 1014 mb
Low level cloud: 38%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

10 / 16 mph 62 / 61°F 78% 1013 mb
Low level cloud: 82%
Mid level cloud: 5%
High level cloud: 16%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

9 / 15 mph 61 / 59°F 85% 1012 mb
Low level cloud: 20%
Mid level cloud: 11%
High level cloud: 11%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

6 / 11 mph 57 / 55°F 91% 1012 mb
Low level cloud: 20%
Mid level cloud: 20%
High level cloud: 6%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NE
NE

6 / 10 mph 53 / 51°F 93% 1012 mb
Low level cloud: 5%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

6 / 9 mph 51 / 49°F 90% 1011 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
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 / 8 mph 50 / 47°F 85% 1011 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

5 / 6 mph 54 / 52°F 69% 1011 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

2 / 4 mph 58 / 57°F 59% 1011 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
15:00

NW
NW

4 / 6 mph 61 / 59°F 56% 1010 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
18:00

NW
NW

6 / 7 mph 61 / 59°F 81% 1011 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

7 / 12 mph 56 / 53°F 88% 1012 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

W
W

7 / 13 mph 53 / 50°F 91% 1012 mb
Low level cloud: 2%
Mid level cloud: 14%
High level cloud: 81%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

8 / 14 mph 52 / 49°F 92% 1011 mb
Low level cloud: 6%
Mid level cloud: 16%
High level cloud: 6%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

5 / 9 mph 54 / 52°F 90% 1012 mb
Low level cloud: 5%
Mid level cloud: 14%
High level cloud: 10%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

7 / 10 mph 59 / 56°F 81% 1012 mb
Low level cloud: 12%
Mid level cloud: 14%
High level cloud: 14%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

8 / 13 mph 62 / 59°F 85% 1012 mb
Low level cloud: 22%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

13 / 20 mph 61 / 60°F 84% 1012 mb
Low level cloud: 15%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: low
32%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NW
NW

14 / 23 mph 58 / 54°F 86% 1013 mb
Low level cloud: 18%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

13 / 21 mph 54 / 49°F 85% 1015 mb
Low level cloud: 29%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

WNW
WNW

11 / 18 mph 52 / 48°F 90% 1016 mb
Low level cloud: 3%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

11 / 20 mph 48 / 43°F 80% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 15%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

14 / 22 mph 48 / 42°F 76% 1019 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 14%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

17 / 23 mph 52 / 45°F 69% 1020 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 3%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

15 / 20 mph 55 / 50°F 67% 1021 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

14 / 21 mph 56 / 51°F 71% 1021 mb
Low level cloud: 16%
Mid level cloud: 19%
High level cloud: 4%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

9 / 13 mph 56 / 51°F 81% 1022 mb
Low level cloud: 64%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

7 / 12 mph 53 / 49°F 83% 1024 mb
Low level cloud: 16%
Mid level cloud: 1%
High level cloud: 10%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May
00:00

N
N

4 / 9 mph 52 / 51°F 97% 1012 mb
Low level cloud: 96%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: low
98%
0.0 In
06:00

NNE
NNE

6 / 13 mph 50 / 47°F 92% 1013 mb
Low level cloud: 64%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
97%
0.0 In
12:00

E
E

11 / 24 mph 61 / 61°F 81% 1015 mb
Low level cloud: 73%
Mid level cloud: 41%
High level cloud: 100%
Most Significant Cloud Type: low
99%
0.0 In
18:00

ESE
ESE

12 / 26 mph 59 / 59°F 89% 1017 mb
Low level cloud: 36%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
Sat 25
May
00:00

N
N

9 / 18 mph 56 / 54°F 97% 1018 mb
Low level cloud: 93%
Mid level cloud: 42%
High level cloud: 31%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

7 / 15 mph 51 / 49°F 85% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

SSW
SSW

5 / 10 mph 57 / 56°F 66% 1021 mb
Low level cloud: 28%
Mid level cloud: 28%
High level cloud: 88%
Most Significant Cloud Type: low
48%
0.0 In
18:00

SSE
SSE

11 / 22 mph 60 / 60°F 83% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 40%
Most Significant Cloud Type: high
39%
0.0 In
Sun 26
May
00:00

SSW
SSW

10 / 19 mph 51 / 47°F 79% 1019 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
0.0 In
06:00

ESE
ESE

4 / 9 mph 54 / 53°F 89% 1017 mb
Low level cloud: 64%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: low
95%
0.0 In
12:00

SSW
SSW

14 / 28 mph 55 / 51°F 96% 1014 mb
Low level cloud: 99%
Mid level cloud: 93%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
18:00

W
W

13 / 26 mph 55 / 52°F 85% 1015 mb
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
11%
0.1 In
Mon 27
May
00:00

WNW
WNW

16 / 32 mph 50 / 44°F 83% 1014 mb
Low level cloud: 2%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
0.1 In
06:00

WNW
WNW

15 / 31 mph 49 / 43°F 87% 1018 mb
Low level cloud: 50%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
12:00

WNW
WNW

19 / 37 mph 53 / 48°F 68% 1017 mb
Low level cloud: 32%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: low
37%
0.0 In
18:00

WNW
WNW

15 / 30 mph 51 / 46°F 72% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Tue 28
May
00:00

SW
SW

9 / 17 mph 48 / 44°F 85% 1016 mb
Low level cloud: 8%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

W
W

5 / 11 mph 51 / 49°F 83% 1024 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
12:00

WSW
WSW

18 / 36 mph 59 / 59°F 94% 1009 mb
Low level cloud: 94%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
18:00

WNW
WNW

12 / 26 mph 53 / 49°F 74% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: medium
2%
0.0 In
Wed 29
May
00:00

SSW
SSW

13 / 25 mph 56 / 53°F 95% 1009 mb
Low level cloud: 90%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WSW
WSW

5 / 11 mph 45 / 42°F 82% 1023 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 52%
Most Significant Cloud Type: medium
48%
0.0 In
12:00

S
S

8 / 16 mph 59 / 57°F 96% 1010 mb
Low level cloud: 88%
Mid level cloud: 43%
High level cloud: 25%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

16 / 33 mph 50 / 44°F 93% 1019 mb
Low level cloud: 92%
Mid level cloud: 88%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Thu 30
May
00:00

SSE
SSE

11 / 23 mph 55 / 51°F 94% 1009 mb
Low level cloud: 30%
Mid level cloud: 31%
High level cloud: 93%
Most Significant Cloud Type: low
52%
0.0 In
06:00

NW
NW

13 / 26 mph 50 / 45°F 91% 1019 mb
Low level cloud: 37%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
37%
0.0 In
12:00

S
S

11 / 23 mph 56 / 53°F 97% 1005 mb
Low level cloud: 85%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NW
NW

14 / 29 mph 55 / 51°F 77% 1021 mb
Low level cloud: 4%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
0.0 In
Fri 31
May
00:00

WSW
WSW

11 / 22 mph 48 / 44°F 93% 1009 mb
Low level cloud: 29%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
31%
0.1 In
06:00

W
W

6 / 12 mph 52 / 51°F 88% 1022 mb
Low level cloud: 8%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
12:00

SSW
SSW

17 / 35 mph 58 / 55°F 77% 1008 mb
Low level cloud: 58%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.1 In
18:00

WSW
WSW

13 / 27 mph 55 / 51°F 76% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 32%
Most Significant Cloud Type: medium
3%
0.0 In
Sat 01
Jun
00:00

SSW
SSW

9 / 19 mph 51 / 47°F 93% 1006 mb
Low level cloud: 13%
Mid level cloud: 100%
High level cloud: 8%
Most Significant Cloud Type: medium
100%
0.1 In
06:00

WSW
WSW

13 / 28 mph 52 / 47°F 89% 1021 mb
Low level cloud: 33%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
36%
0.0 In
12:00

WSW
WSW

18 / 38 mph 54 / 49°F 73% 1008 mb
Low level cloud: 12%
Mid level cloud: 6%
High level cloud: 7%
Most Significant Cloud Type: low
14%
0.1 In
18:00

W
W

9 / 20 mph 58 / 56°F 82% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 58%
Most Significant Cloud Type: medium
6%
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