WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Mullagh 14 Day Long Range Forecast

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

Galway, Ireland

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

The forecast for Mullagh in the coming two weeks is predicting the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 21°C expected on the afternoon of Sunday 19th. The average minimum temperature will be 9°C, dipping to its lowest on the morning of Saturday 25th at 7°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. The current forecast indicates Thursday 23rd will have the most precipitation with an accumulation of around 13.0mm. On the whole winds are likely to be light.

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

NNW
NNW

6 / 10 mph 66 / 63°F 85% 1017 mb
Low level cloud: 49%
Mid level cloud: 16%
High level cloud: 2%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

6 / 13 mph 54 / 50°F 97% 1018 mb
Low level cloud: 58%
Mid level cloud: 9%
High level cloud: 10%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NNW
NNW

5 / 10 mph 48 / 46°F 98% 1019 mb
Low level cloud: 32%
Mid level cloud: 12%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

4 / 8 mph 45 / 44°F 95% 1018 mb
Low level cloud: 19%
Mid level cloud: 12%
High level cloud: 12%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

3 / 6 mph 47 / 46°F 91% 1019 mb
Low level cloud: 2%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

5 / 6 mph 59 / 57°F 73% 1018 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 33%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

6 / 6 mph 69 / 66°F 67% 1017 mb
Low level cloud: 19%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

6 / 8 mph 69 / 67°F 71% 1016 mb
Low level cloud: 69%
Mid level cloud: 15%
High level cloud: 34%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

5 / 7 mph 67 / 64°F 89% 1016 mb
Low level cloud: 7%
Mid level cloud: 18%
High level cloud: 16%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

4 / 9 mph 58 / 56°F 95% 1016 mb
Low level cloud: 2%
Mid level cloud: 19%
High level cloud: 11%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

E
E

4 / 8 mph 51 / 51°F 95% 1016 mb
Low level cloud: 5%
Mid level cloud: 19%
High level cloud: 15%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

3 / 6 mph 50 / 50°F 96% 1016 mb
Low level cloud: 10%
Mid level cloud: 24%
High level cloud: 24%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

4 / 7 mph 53 / 51°F 94% 1015 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 3%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

4 / 5 mph 64 / 62°F 74% 1015 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

6 / 6 mph 70 / 67°F 59% 1014 mb
Low level cloud: 32%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

6 / 8 mph 71 / 68°F 64% 1013 mb
Low level cloud: 49%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

6 / 9 mph 66 / 64°F 77% 1012 mb
Low level cloud: 12%
Mid level cloud: 23%
High level cloud: 14%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

4 / 9 mph 55 / 53°F 87% 1013 mb
Low level cloud: 11%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: medium
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

SSE
SSE

3 / 7 mph 50 / 50°F 86% 1012 mb
Low level cloud: 12%
Mid level cloud: 36%
High level cloud: 5%
Most Significant Cloud Type: medium
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

2 / 4 mph 51 / 52°F 79% 1011 mb
Low level cloud: 22%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

1 / 2 mph 52 / 52°F 80% 1011 mb
Low level cloud: 15%
Mid level cloud: 94%
High level cloud: 9%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

0 / 1 mph 55 / 55°F 78% 1011 mb
Low level cloud: 21%
Mid level cloud: 92%
High level cloud: 30%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

2 / 3 mph 64 / 61°F 70% 1011 mb
Low level cloud: 5%
Mid level cloud: 49%
High level cloud: 32%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

4 / 4 mph 65 / 63°F 70% 1010 mb
Low level cloud: 12%
Mid level cloud: 56%
High level cloud: 75%
Most Significant Cloud Type: medium
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

4 / 6 mph 60 / 60°F 90% 1010 mb
Low level cloud: 11%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

W
W

4 / 8 mph 55 / 54°F 94% 1011 mb
Low level cloud: 6%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 22
May
00:00

NW
NW

5 / 8 mph 53 / 52°F 99% 1011 mb
Low level cloud: 91%
Mid level cloud: 53%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

4 / 7 mph 53 / 52°F 99% 1011 mb
Low level cloud: 97%
Mid level cloud: 44%
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

NW
NW

6 / 9 mph 54 / 52°F 99% 1012 mb
Low level cloud: 91%
Mid level cloud: 44%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

8 / 12 mph 55 / 52°F 98% 1012 mb
Low level cloud: 95%
Mid level cloud: 31%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

10 / 13 mph 57 / 54°F 93% 1013 mb
Low level cloud: 82%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

11 / 16 mph 60 / 60°F 90% 1012 mb
Low level cloud: 71%
Mid level cloud: 39%
High level cloud: 100%
Most Significant Cloud Type: low
96%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NNW
NNW

14 / 22 mph 57 / 54°F 94% 1013 mb
Low level cloud: 58%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: low
90%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNW
NNW

15 / 22 mph 52 / 47°F 96% 1014 mb
Low level cloud: 99%
Mid level cloud: 62%
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 23
May
00:00

NW
NW

15 / 19 mph 51 / 46°F 96% 1013 mb
Low level cloud: 100%
Mid level cloud: 86%
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

NW
NW

17 / 23 mph 49 / 43°F 98% 1011 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
06:00

NW
NW

17 / 26 mph 48 / 42°F 98% 1009 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
09:00

NNW
NNW

11 / 13 mph 52 / 47°F 98% 1007 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

NNW
NNW

7 / 8 mph 55 / 53°F 99% 1007 mb
Low level cloud: 99%
Mid level cloud: 92%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

6 / 7 mph 57 / 56°F 99% 1006 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

9 / 10 mph 55 / 53°F 97% 1006 mb
Low level cloud: 93%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

10 / 11 mph 53 / 49°F 96% 1008 mb
Low level cloud: 93%
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
Fri 24
May
00:00

ESE
ESE

11 / 17 mph 50 / 46°F 96% 1008 mb
Low level cloud: 100%
Mid level cloud: 57%
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

SE
SE

14 / 20 mph 52 / 47°F 94% 1008 mb
Low level cloud: 99%
Mid level cloud: 89%
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

SSE
SSE

17 / 25 mph 51 / 45°F 90% 1010 mb
Low level cloud: 85%
Mid level cloud: 54%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

14 / 20 mph 51 / 46°F 90% 1012 mb
Low level cloud: 79%
Mid level cloud: 46%
High level cloud: 19%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

12 / 15 mph 53 / 49°F 83% 1014 mb
Low level cloud: 72%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

9 / 12 mph 53 / 49°F 84% 1015 mb
Low level cloud: 66%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

9 / 12 mph 54 / 50°F 82% 1015 mb
Low level cloud: 13%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

6 / 13 mph 48 / 44°F 96% 1017 mb
Low level cloud: 23%
Mid level cloud: 22%
High level cloud: 37%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 25
May
00:00

E
E

2 / 5 mph 56 / 57°F 91% 1021 mb
Low level cloud: 67%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
94%
0.0 In
06:00

SSE
SSE

7 / 15 mph 54 / 52°F 95% 1021 mb
Low level cloud: 56%
Mid level cloud: 11%
High level cloud: 94%
Most Significant Cloud Type: low
70%
0.0 In
12:00

S
S

16 / 34 mph 53 / 49°F 84% 1014 mb
Low level cloud: 93%
Mid level cloud: 81%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSE
SSE

13 / 27 mph 60 / 60°F 76% 1014 mb
Low level cloud: 10%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: medium
94%
0.0 In
Sun 26
May
00:00

SE
SE

10 / 20 mph 54 / 51°F 84% 1010 mb
Low level cloud: 90%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SE
SE

6 / 14 mph 51 / 49°F 98% 1013 mb
Low level cloud: 58%
Mid level cloud: 11%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WNW
WNW

5 / 10 mph 53 / 52°F 94% 1008 mb
Low level cloud: 84%
Mid level cloud: 94%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NE
NE

6 / 14 mph 54 / 53°F 98% 1011 mb
Low level cloud: 83%
Mid level cloud: 81%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
Mon 27
May
00:00

SSE
SSE

6 / 12 mph 50 / 48°F 95% 1010 mb
Low level cloud: 73%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
06:00

ESE
ESE

6 / 12 mph 53 / 51°F 98% 1011 mb
Low level cloud: 72%
Mid level cloud: 31%
High level cloud: 9%
Most Significant Cloud Type: low
83%
0.2 In
12:00

SSE
SSE

10 / 21 mph 58 / 55°F 84% 1007 mb
Low level cloud: 92%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NE
NE

8 / 16 mph 59 / 59°F 92% 1011 mb
Low level cloud: 77%
Mid level cloud: 59%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Tue 28
May
00:00

SSW
SSW

6 / 13 mph 50 / 47°F 98% 1007 mb
Low level cloud: 78%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.1 In
06:00

NNE
NNE

4 / 9 mph 55 / 55°F 97% 1011 mb
Low level cloud: 74%
Mid level cloud: 24%
High level cloud: 32%
Most Significant Cloud Type: low
85%
0.0 In
12:00

WSW
WSW

15 / 31 mph 59 / 59°F 73% 1007 mb
Low level cloud: 60%
Mid level cloud: 18%
High level cloud: 3%
Most Significant Cloud Type: low
66%
0.1 In
18:00

E
E

4 / 9 mph 61 / 61°F 89% 1010 mb
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
44%
0.1 In
Wed 29
May
00:00

SW
SW

5 / 11 mph 45 / 42°F 96% 1008 mb
Low level cloud: 13%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.0 In
06:00

NE
NE

1 / 2 mph 55 / 55°F 98% 1009 mb
Low level cloud: 93%
Mid level cloud: 63%
High level cloud: 93%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

13 / 26 mph 59 / 59°F 77% 1010 mb
Low level cloud: 41%
Mid level cloud: 19%
High level cloud: 21%
Most Significant Cloud Type: low
50%
0.0 In
18:00

WNW
WNW

6 / 12 mph 58 / 57°F 94% 1008 mb
Low level cloud: 89%
Mid level cloud: 74%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.3 In
Thu 30
May
00:00

WSW
WSW

5 / 10 mph 45 / 42°F 97% 1015 mb
Low level cloud: 32%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.0 In
06:00

SSW
SSW

3 / 6 mph 50 / 51°F 95% 1009 mb
Low level cloud: 15%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

W
W

5 / 11 mph 62 / 62°F 62% 1017 mb
Low level cloud: 81%
Mid level cloud: 30%
High level cloud: 11%
Most Significant Cloud Type: low
93%
0.0 In
18:00

W
W

2 / 5 mph 57 / 58°F 91% 1004 mb
Low level cloud: 6%
Mid level cloud: 96%
High level cloud: 93%
Most Significant Cloud Type: medium
100%
0.2 In
Fri 31
May
00:00

W
W

2 / 3 mph 48 / 49°F 95% 1019 mb
Low level cloud: 17%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
32%
0.0 In
06:00

S
S

2 / 5 mph 51 / 52°F 98% 1000 mb
Low level cloud: 87%
Mid level cloud: 88%
High level cloud: 89%
Most Significant Cloud Type: low
100%
0.3 In
12:00

S
S

3 / 6 mph 55 / 55°F 93% 1018 mb
Low level cloud: 55%
Mid level cloud: 88%
High level cloud: 97%
Most Significant Cloud Type: low
97%
0.1 In
18:00

ESE
ESE

5 / 11 mph 56 / 56°F 89% 999 mb
Low level cloud: 27%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: low
45%
0.2 In
Sat 01
Jun
00:00

SE
SE

10 / 20 mph 51 / 47°F 98% 1011 mb
Low level cloud: 99%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.8 In
06:00

ENE
ENE

2 / 5 mph 51 / 51°F 95% 1001 mb
Low level cloud: 27%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
46%
0.0 In
12:00

SW
SW

7 / 15 mph 68 / 68°F 70% 1011 mb
Low level cloud: 53%
Mid level cloud: 28%
High level cloud: 68%
Most Significant Cloud Type: low
70%
0.0 In
18:00

NNE
NNE

5 / 10 mph 60 / 60°F 87% 1003 mb
Low level cloud: 20%
Mid level cloud: 14%
High level cloud: 16%
Most Significant Cloud Type: low
26%
0.3 In
Sun 02
Jun
00:00

SSE
SSE

7 / 15 mph 56 / 54°F 98% 1004 mb
Low level cloud: 86%
Mid level cloud: 76%
High level cloud: 68%
Most Significant Cloud Type: low
100%
0.2 In
06:00

N
N

2 / 3 mph 49 / 49°F 96% 1007 mb
Low level cloud: 45%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
65%
0.0 In
12:00

SSW
SSW

14 / 30 mph 61 / 61°F 79% 999 mb
Low level cloud: 55%
Mid level cloud: 18%
High level cloud: 20%
Most Significant Cloud Type: low
63%
0.7 In
18:00

NNW
NNW

8 / 17 mph 54 / 51°F 96% 1011 mb
Low level cloud: 87%
Mid level cloud: 86%
High level cloud: 29%
Most Significant Cloud Type: low
100%
0.1 In

Other Locations Near to Mullagh

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