WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Upper Maes-coed 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Upper Maes-coed

Hereford and Worcester, United Kingdom

Long range weather outlook for Upper Maes-coed includes 14 day forecast summary:

Reviewing the forecast for Upper Maes-coed Over the next 14 days and the average daytime maximum temperature will be around 9°C, with a high for the two weeks of 11°C expected on the afternoon of Sunday 14th. The average minimum temperature will be 4°C, dipping to its lowest on the morning of Sunday 21st at 0°C. Expect the following 14 days ahead to have mixed overhead conditions with some days dry and some seeing a significant amount of rain. The indicators are that Monday 15th will have the most precipitation with an accumulation of around 27.0mm. On the whole winds are likely to be moderate. Expect the strongest wind on the morning of Friday 19th, coming from a south westerly direction, and reaching around 29mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 13
Dec
21:00

SSW
SSW

14 / 19 mph 46 / 39°F 87% 1023 mb
Low level cloud: 11%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 14
Dec
00:00

SSW
SSW

14 / 17 mph 47 / 41°F 87% 1022 mb
Low level cloud: 33%
Mid level cloud: 100%
High level cloud: 22%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

14 / 22 mph 45 / 39°F 84% 1020 mb
Low level cloud: 21%
Mid level cloud: 94%
High level cloud: 34%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

13 / 24 mph 44 / 38°F 84% 1018 mb
Low level cloud: 15%
Mid level cloud: 58%
High level cloud: 34%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

14 / 22 mph 47 / 41°F 79% 1017 mb
Low level cloud: 0%
Mid level cloud: 69%
High level cloud: 11%
Most Significant Cloud Type: medium
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

18 / 22 mph 50 / 44°F 81% 1015 mb
Low level cloud: 7%
Mid level cloud: 27%
High level cloud: 33%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

19 / 22 mph 52 / 46°F 82% 1012 mb
Low level cloud: 19%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

20 / 28 mph 50 / 44°F 84% 1009 mb
Low level cloud: 31%
Mid level cloud: 44%
High level cloud: 63%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

21 / 42 mph 48 / 40°F 83% 1008 mb
Low level cloud: 45%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 15
Dec
00:00

SSW
SSW

21 / 39 mph 48 / 41°F 89% 1006 mb
Low level cloud: 62%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

19 / 36 mph 47 / 40°F 93% 1004 mb
Low level cloud: 93%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

14 / 28 mph 46 / 40°F 95% 1002 mb
Low level cloud: 96%
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
09:00

SSW
SSW

16 / 26 mph 48 / 42°F 94% 1002 mb
Low level cloud: 96%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
12:00

S
S

14 / 17 mph 51 / 46°F 94% 1002 mb
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
15:00

S
S

10 / 12 mph 52 / 48°F 95% 1001 mb
Low level cloud: 96%
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

S
S

12 / 16 mph 51 / 46°F 94% 1001 mb
Low level cloud: 98%
Mid level cloud: 100%
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

WNW
WNW

9 / 12 mph 49 / 45°F 95% 1003 mb
Low level cloud: 83%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
Tue 16
Dec
00:00

NNW
NNW

4 / 5 mph 47 / 45°F 92% 1006 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

3 / 4 mph 46 / 45°F 90% 1007 mb
Low level cloud: 88%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

3 / 4 mph 45 / 44°F 91% 1009 mb
Low level cloud: 42%
Mid level cloud: 100%
High level cloud: 41%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

4 / 6 mph 44 / 42°F 89% 1011 mb
Low level cloud: 14%
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
12:00

N
N

6 / 7 mph 46 / 43°F 83% 1013 mb
Low level cloud: 8%
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

NNW
NNW

5 / 7 mph 46 / 43°F 86% 1014 mb
Low level cloud: 10%
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
18:00

NW
NW

3 / 6 mph 41 / 39°F 90% 1016 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

3 / 6 mph 39 / 38°F 89% 1018 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 17
Dec
00:00

WSW
WSW

2 / 4 mph 37 / 36°F 89% 1019 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

SW
SW

3 / 6 mph 35 / 33°F 89% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

4 / 8 mph 34 / 30°F 88% 1020 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 8%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

6 / 13 mph 36 / 30°F 92% 1020 mb
Low level cloud: 10%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

11 / 15 mph 44 / 38°F 87% 1019 mb
Low level cloud: 45%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

15 / 22 mph 45 / 38°F 88% 1017 mb
Low level cloud: 62%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

16 / 23 mph 46 / 39°F 89% 1017 mb
Low level cloud: 82%
Mid level cloud: 68%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

15 / 23 mph 47 / 40°F 92% 1016 mb
Low level cloud: 90%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 18
Dec
00:00

SSW
SSW

13 / 23 mph 46 / 40°F 95% 1015 mb
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

12 / 23 mph 45 / 39°F 96% 1015 mb
Low level cloud: 93%
Mid level cloud: 73%
High level cloud: 83%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

15 / 32 mph 44 / 36°F 94% 1013 mb
Low level cloud: 97%
Mid level cloud: 47%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

S
S

20 / 31 mph 47 / 39°F 88% 1011 mb
Low level cloud: 68%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

23 / 27 mph 50 / 42°F 85% 1007 mb
Low level cloud: 78%
Mid level cloud: 12%
High level cloud: 20%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

23 / 27 mph 51 / 44°F 89% 1004 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 57%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

23 / 36 mph 50 / 42°F 92% 1001 mb
Low level cloud: 100%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SSW
SSW

20 / 30 mph 47 / 40°F 79% 1003 mb
Low level cloud: 7%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: medium
88%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Fri 19
Dec
00:00

SSW
SSW

24 / 37 mph 44 / 34°F 77% 1004 mb
Low level cloud: 26%
Mid level cloud: 2%
High level cloud: 41%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

28 / 43 mph 43 / 32°F 75% 1005 mb
Low level cloud: 38%
Mid level cloud: 2%
High level cloud: 21%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

27 / 36 mph 45 / 35°F 88% 1006 mb
Low level cloud: 99%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

15 / 23 mph 45 / 38°F 84% 1011 mb
Low level cloud: 67%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

12 / 15 mph 47 / 42°F 80% 1014 mb
Low level cloud: 4%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

10 / 15 mph 45 / 40°F 81% 1016 mb
Low level cloud: 8%
Mid level cloud: 100%
High level cloud: 43%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

5 / 9 mph 41 / 38°F 88% 1018 mb
Low level cloud: 15%
Mid level cloud: 45%
High level cloud: 4%
Most Significant Cloud Type: medium
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

3 / 7 mph 38 / 36°F 92% 1021 mb
Low level cloud: 25%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 20
Dec
00:00

SSW
SSW

16 / 22 mph 47 / 40°F 82% 1012 mb
Low level cloud: 79%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
06:00

SSW
SSW

11 / 18 mph 41 / 35°F 88% 1015 mb
Low level cloud: 34%
Mid level cloud: 11%
High level cloud: 3%
Most Significant Cloud Type: low
38%
0.0 In
12:00

SSW
SSW

26 / 33 mph 51 / 44°F 84% 1013 mb
Low level cloud: 96%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

13 / 19 mph 47 / 41°F 92% 1023 mb
Low level cloud: 82%
Mid level cloud: 2%
High level cloud: 41%
Most Significant Cloud Type: low
87%
0.0 In
Sun 21
Dec
00:00

WSW
WSW

17 / 27 mph 50 / 44°F 86% 1018 mb
Low level cloud: 23%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
06:00

SW
SW

2 / 5 mph 36 / 34°F 93% 1029 mb
Low level cloud: 17%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

N
N

2 / 3 mph 40 / 40°F 78% 1022 mb
Low level cloud: 1%
Mid level cloud: 100%
High level cloud: 97%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

SSE
SSE

3 / 4 mph 45 / 45°F 91% 1022 mb
Low level cloud: 31%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.0 In
Mon 22
Dec
00:00

WSW
WSW

6 / 13 mph 38 / 33°F 93% 1018 mb
Low level cloud: 15%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
06:00

WNW
WNW

3 / 5 mph 41 / 40°F 89% 1025 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
12:00

WNW
WNW

13 / 18 mph 48 / 43°F 83% 1018 mb
Low level cloud: 84%
Mid level cloud: 11%
High level cloud: 33%
Most Significant Cloud Type: low
92%
0.0 In
18:00

WNW
WNW

2 / 3 mph 48 / 49°F 88% 1026 mb
Low level cloud: 12%
Mid level cloud: 1%
High level cloud: 20%
Most Significant Cloud Type: low
14%
0.0 In
Tue 23
Dec
00:00

WNW
WNW

10 / 15 mph 46 / 41°F 84% 1022 mb
Low level cloud: 91%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NW
NW

2 / 5 mph 37 / 36°F 92% 1027 mb
Low level cloud: 11%
Mid level cloud: 4%
High level cloud: 48%
Most Significant Cloud Type: low
18%
0.0 In
12:00

WNW
WNW

6 / 8 mph 49 / 47°F 84% 1023 mb
Low level cloud: 11%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
80%
0.0 In
18:00

NNW
NNW

2 / 2 mph 44 / 44°F 91% 1028 mb
Low level cloud: 7%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
Wed 24
Dec
00:00

WSW
WSW

2 / 3 mph 45 / 45°F 91% 1026 mb
Low level cloud: 60%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
87%
0.0 In
06:00

NNE
NNE

3 / 4 mph 35 / 33°F 92% 1030 mb
Low level cloud: 8%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
12:00

S
S

4 / 5 mph 52 / 51°F 85% 1028 mb
Low level cloud: 25%
Mid level cloud: 15%
High level cloud: 16%
Most Significant Cloud Type: low
31%
0.0 In
18:00

NNE
NNE

5 / 8 mph 39 / 35°F 95% 1032 mb
Low level cloud: 80%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.0 In
Thu 25
Dec
00:00

S
S

6 / 9 mph 47 / 44°F 96% 1028 mb
Low level cloud: 84%
Mid level cloud: 22%
High level cloud: 4%
Most Significant Cloud Type: low
91%
0.0 In
06:00

NNE
NNE

5 / 9 mph 38 / 34°F 89% 1031 mb
Low level cloud: 86%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In
12:00

NNW
NNW

4 / 6 mph 48 / 46°F 92% 1031 mb
Low level cloud: 98%
Mid level cloud: 95%
High level cloud: 21%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NE
NE

8 / 13 mph 42 / 37°F 89% 1028 mb
Low level cloud: 90%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Fri 26
Dec
00:00

NNW
NNW

6 / 12 mph 35 / 29°F 92% 1038 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
06:00

ENE
ENE

13 / 21 mph 33 / 24°F 84% 1026 mb
Low level cloud: 100%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

N
N

8 / 11 mph 41 / 36°F 81% 1041 mb
Low level cloud: 22%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
18:00

ENE
ENE

15 / 23 mph 37 / 29°F 79% 1023 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Sat 27
Dec
00:00

NNW
NNW

3 / 6 mph 35 / 33°F 93% 1043 mb
Low level cloud: 16%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.0 In
06:00

ESE
ESE

11 / 18 mph 32 / 23°F 91% 1024 mb
Low level cloud: 97%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
12:00

SSW
SSW

2 / 2 mph 45 / 45°F 75% 1043 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

8 / 13 mph 36 / 30°F 95% 1027 mb
Low level cloud: 97%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
Sun 28
Dec
00:00

SW
SW

2 / 3 mph 36 / 36°F 81% 1042 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

ENE
ENE

10 / 17 mph 29 / 20°F 92% 1023 mb
Low level cloud: 71%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
12:00

NNW
NNW

1 / 2 mph 42 / 42°F 61% 1043 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
18:00

E
E

6 / 11 mph 35 / 29°F 96% 1024 mb
Low level cloud: 97%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
100%
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