WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Sandfield 14 Day Long Range Forecast

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

Donegal, Ireland

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

Reviewing the forecast for Sandfield Over the next 14 days and the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 17°C expected on the afternoon of Monday 3rd. The mean minimum temperature will be 11°C, dipping to its lowest on the morning of Thursday 6th at 9°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Predictions are Wednesday 29th 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
Mon 27
May
18:00

WSW
WSW

9 / 11 mph 59 / 55°F 83% 1008 mb
Low level cloud: 57%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

5 / 7 mph 56 / 54°F 85% 1008 mb
Low level cloud: 68%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May
00:00

S
S

8 / 12 mph 53 / 50°F 87% 1007 mb
Low level cloud: 58%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

10 / 14 mph 51 / 47°F 88% 1005 mb
Low level cloud: 6%
Mid level cloud: 44%
High level cloud: 61%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

16 / 29 mph 50 / 44°F 88% 1003 mb
Low level cloud: 100%
Mid level cloud: 91%
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

S
S

15 / 21 mph 53 / 49°F 94% 1002 mb
Low level cloud: 100%
Mid level cloud: 68%
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

SW
SW

21 / 24 mph 58 / 53°F 89% 1003 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

WSW
WSW

21 / 25 mph 60 / 59°F 86% 1003 mb
Low level cloud: 23%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

19 / 22 mph 57 / 53°F 91% 1003 mb
Low level cloud: 80%
Mid level cloud: 61%
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

WSW
WSW

18 / 23 mph 55 / 50°F 91% 1005 mb
Low level cloud: 79%
Mid level cloud: 51%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
May
00:00

W
W

11 / 16 mph 53 / 49°F 94% 1005 mb
Low level cloud: 88%
Mid level cloud: 71%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

8 / 12 mph 52 / 49°F 91% 1007 mb
Low level cloud: 30%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

12 / 20 mph 52 / 47°F 92% 1008 mb
Low level cloud: 52%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

13 / 21 mph 54 / 49°F 88% 1009 mb
Low level cloud: 16%
Mid level cloud: 29%
High level cloud: 4%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

14 / 21 mph 55 / 51°F 83% 1010 mb
Low level cloud: 0%
Mid level cloud: 36%
High level cloud: 0%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

17 / 25 mph 56 / 51°F 82% 1011 mb
Low level cloud: 5%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

21 / 28 mph 55 / 49°F 85% 1011 mb
Low level cloud: 2%
Mid level cloud: 47%
High level cloud: 38%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

18 / 25 mph 54 / 48°F 87% 1013 mb
Low level cloud: 27%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 30
May
00:00

NW
NW

13 / 15 mph 53 / 49°F 86% 1012 mb
Low level cloud: 72%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

16 / 28 mph 52 / 47°F 85% 1013 mb
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

23 / 36 mph 52 / 45°F 92% 1016 mb
Low level cloud: 75%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

23 / 30 mph 54 / 48°F 87% 1018 mb
Low level cloud: 53%
Mid level cloud: 19%
High level cloud: 1%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

20 / 24 mph 56 / 51°F 84% 1020 mb
Low level cloud: 70%
Mid level cloud: 11%
High level cloud: 14%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

20 / 23 mph 58 / 53°F 82% 1021 mb
Low level cloud: 54%
Mid level cloud: 22%
High level cloud: 2%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

18 / 21 mph 56 / 51°F 80% 1022 mb
Low level cloud: 55%
Mid level cloud: 43%
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

NNW
NNW

16 / 18 mph 55 / 50°F 88% 1024 mb
Low level cloud: 15%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 31
May
00:00

NNW
NNW

13 / 17 mph 53 / 49°F 89% 1024 mb
Low level cloud: 13%
Mid level cloud: 29%
High level cloud: 96%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

13 / 19 mph 52 / 48°F 83% 1024 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

12 / 19 mph 52 / 47°F 81% 1025 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 46%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

13 / 18 mph 54 / 49°F 77% 1025 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

12 / 16 mph 56 / 51°F 74% 1026 mb
Low level cloud: 0%
Mid level cloud: 54%
High level cloud: 100%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

14 / 16 mph 55 / 52°F 83% 1026 mb
Low level cloud: 97%
Mid level cloud: 47%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

14 / 17 mph 55 / 51°F 89% 1027 mb
Low level cloud: 64%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

14 / 18 mph 54 / 49°F 91% 1028 mb
Low level cloud: 36%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 01
Jun
00:00

N
N

10 / 14 mph 53 / 50°F 91% 1028 mb
Low level cloud: 22%
Mid level cloud: 47%
High level cloud: 86%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

11 / 15 mph 52 / 49°F 86% 1027 mb
Low level cloud: 1%
Mid level cloud: 19%
High level cloud: 26%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

11 / 17 mph 53 / 48°F 82% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

11 / 15 mph 54 / 50°F 71% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

10 / 12 mph 56 / 53°F 67% 1029 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 19%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

9 / 11 mph 57 / 54°F 66% 1029 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

10 / 13 mph 56 / 53°F 71% 1030 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

8 / 11 mph 55 / 52°F 82% 1030 mb
Low level cloud: 22%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 02
Jun
00:00

NNW
NNW

8 / 11 mph 54 / 52°F 80% 1030 mb
Low level cloud: 34%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

7 / 11 mph 53 / 51°F 84% 1030 mb
Low level cloud: 57%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

7 / 12 mph 52 / 50°F 90% 1030 mb
Low level cloud: 98%
Mid level cloud: 60%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

9 / 13 mph 55 / 52°F 92% 1031 mb
Low level cloud: 86%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

10 / 13 mph 57 / 54°F 87% 1031 mb
Low level cloud: 81%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

10 / 11 mph 58 / 55°F 86% 1031 mb
Low level cloud: 79%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

9 / 11 mph 57 / 54°F 85% 1032 mb
Low level cloud: 76%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

9 / 13 mph 56 / 52°F 84% 1032 mb
Low level cloud: 74%
Mid level cloud: 7%
High level cloud: 12%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Mon 03
Jun
00:00

N
N

22 / 47 mph 52 / 46°F 90% 1012 mb
Low level cloud: 100%
Mid level cloud: 59%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

10 / 22 mph 53 / 50°F 95% 1019 mb
Low level cloud: 100%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

N
N

11 / 23 mph 57 / 55°F 87% 1030 mb
Low level cloud: 82%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.0 In
18:00

NW
NW

6 / 12 mph 59 / 58°F 91% 1032 mb
Low level cloud: 74%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
78%
0.0 In
Tue 04
Jun
00:00

NE
NE

5 / 11 mph 56 / 55°F 93% 1030 mb
Low level cloud: 27%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
06:00

NNE
NNE

3 / 6 mph 53 / 53°F 74% 1028 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 40%
Most Significant Cloud Type: medium
11%
0.0 In
12:00

N
N

11 / 22 mph 59 / 59°F 65% 1030 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
16%
0.0 In
18:00

WNW
WNW

13 / 26 mph 56 / 53°F 76% 1029 mb
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
15%
0.0 In
Wed 05
Jun
00:00

W
W

14 / 30 mph 53 / 48°F 87% 1024 mb
Low level cloud: 9%
Mid level cloud: 29%
High level cloud: 16%
Most Significant Cloud Type: medium
55%
0.0 In
06:00

W
W

23 / 47 mph 51 / 45°F 75% 1022 mb
Low level cloud: 93%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
12:00

NNW
NNW

17 / 36 mph 56 / 52°F 67% 1021 mb
Low level cloud: 51%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.1 In
18:00

WNW
WNW

24 / 51 mph 53 / 47°F 63% 1018 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.1 In
Thu 06
Jun
00:00

N
N

14 / 29 mph 51 / 46°F 73% 1024 mb
Low level cloud: 47%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.0 In
06:00

NNW
NNW

29 / 60 mph 50 / 43°F 69% 1016 mb
Low level cloud: 93%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.1 In
12:00

NW
NW

12 / 26 mph 53 / 49°F 61% 1025 mb
Low level cloud: 58%
Mid level cloud: 43%
High level cloud: 96%
Most Significant Cloud Type: low
84%
0.0 In
18:00

NNW
NNW

27 / 57 mph 51 / 44°F 73% 1018 mb
Low level cloud: 58%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.1 In
Fri 07
Jun
00:00

W
W

15 / 31 mph 52 / 47°F 77% 1019 mb
Low level cloud: 97%
Mid level cloud: 67%
High level cloud: 22%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNW
NNW

15 / 32 mph 51 / 45°F 71% 1020 mb
Low level cloud: 55%
Mid level cloud: 30%
High level cloud: 32%
Most Significant Cloud Type: low
68%
0.1 In
12:00

WSW
WSW

16 / 34 mph 55 / 50°F 88% 1012 mb
Low level cloud: 89%
Mid level cloud: 94%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.2 In
18:00

W
W

11 / 23 mph 53 / 49°F 67% 1019 mb
Low level cloud: 59%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Sat 08
Jun
00:00

SW
SW

7 / 15 mph 52 / 50°F 89% 1010 mb
Low level cloud: 92%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
06:00

SSW
SSW

8 / 17 mph 49 / 45°F 90% 1013 mb
Low level cloud: 85%
Mid level cloud: 69%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.2 In
12:00

SW
SW

18 / 38 mph 55 / 50°F 91% 1008 mb
Low level cloud: 80%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
18:00

NE
NE

16 / 34 mph 52 / 47°F 78% 1015 mb
Low level cloud: 49%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.1 In
Sun 09
Jun
00:00

WSW
WSW

23 / 49 mph 53 / 47°F 94% 1009 mb
Low level cloud: 98%
Mid level cloud: 95%
High level cloud: 11%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NNE
NNE

9 / 19 mph 51 / 48°F 72% 1017 mb
Low level cloud: 44%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
55%
0.0 In
12:00

WSW
WSW

17 / 36 mph 52 / 47°F 85% 1017 mb
Low level cloud: 91%
Mid level cloud: 71%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NNE
NNE

8 / 17 mph 55 / 52°F 68% 1016 mb
Low level cloud: 51%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
98%
0.0 In
Mon 10
Jun
00:00

SW
SW

17 / 35 mph 55 / 51°F 87% 1022 mb
Low level cloud: 38%
Mid level cloud: 7%
High level cloud: 40%
Most Significant Cloud Type: low
45%
0.0 In
06:00

SE
SE

7 / 15 mph 52 / 49°F 83% 1013 mb
Low level cloud: 82%
Mid level cloud: 72%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

17 / 35 mph 57 / 53°F 72% 1024 mb
Low level cloud: 30%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
30%
0.0 In
18:00

N
N

7 / 14 mph 55 / 53°F 79% 1015 mb
Low level cloud: 47%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.0 In
Tue 11
Jun
00:00

SSE
SSE

9 / 18 mph 54 / 52°F 83% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

W
W

2 / 4 mph 54 / 54°F 81% 1017 mb
Low level cloud: 39%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
61%
0.0 In
12:00

WSW
WSW

7 / 15 mph 61 / 61°F 72% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

W
W

9 / 19 mph 56 / 54°F 83% 1020 mb
Low level cloud: 38%
Mid level cloud: 46%
High level cloud: 64%
Most Significant Cloud Type: low
61%
0.0 In

Other Locations Near to Sandfield

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