WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Water Garth Nook 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Water Garth Nook

Cumbria, United Kingdom

Long range weather outlook for Water Garth Nook includes 14 day forecast summary:

The next 14 day outlook for Water Garth Nook shows the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 19°C expected on the evening of Friday 24th. The average minimum temperature will be 10°C, dipping to its lowest on the morning of Tuesday 21st at 6°C. Expect the coming 14 days to have most days seeing a little rain. Current predictions suggest Wednesday 15th will have the most precipitation with an accumulation of around 3.0mm. On the whole winds are likely to be moderate.

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

E
E

7 / 10 mph 60 / 57°F 91% 1006 mb
Low level cloud: 31%
Mid level cloud: 54%
High level cloud: 9%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

8 / 14 mph 58 / 54°F 90% 1007 mb
Low level cloud: 10%
Mid level cloud: 28%
High level cloud: 9%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May
00:00

E
E

6 / 12 mph 54 / 52°F 91% 1007 mb
Low level cloud: 5%
Mid level cloud: 10%
High level cloud: 31%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

6 / 11 mph 52 / 51°F 91% 1007 mb
Low level cloud: 3%
Mid level cloud: 7%
High level cloud: 14%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

5 / 9 mph 54 / 51°F 90% 1008 mb
Low level cloud: 1%
Mid level cloud: 30%
High level cloud: 32%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

2 / 3 mph 58 / 58°F 83% 1008 mb
Low level cloud: 1%
Mid level cloud: 41%
High level cloud: 6%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

5 / 6 mph 64 / 61°F 80% 1007 mb
Low level cloud: 28%
Mid level cloud: 77%
High level cloud: 32%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

6 / 10 mph 62 / 62°F 84% 1006 mb
Low level cloud: 80%
Mid level cloud: 44%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

13 / 21 mph 62 / 61°F 83% 1007 mb
Low level cloud: 7%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

14 / 26 mph 54 / 49°F 86% 1008 mb
Low level cloud: 17%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May
00:00

NE
NE

13 / 22 mph 55 / 51°F 85% 1008 mb
Low level cloud: 29%
Mid level cloud: 95%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

16 / 27 mph 54 / 49°F 88% 1007 mb
Low level cloud: 43%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

14 / 25 mph 53 / 48°F 90% 1008 mb
Low level cloud: 80%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

15 / 19 mph 56 / 52°F 91% 1009 mb
Low level cloud: 78%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

14 / 16 mph 59 / 56°F 87% 1010 mb
Low level cloud: 94%
Mid level cloud: 51%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

10 / 12 mph 60 / 60°F 87% 1011 mb
Low level cloud: 94%
Mid level cloud: 78%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

9 / 10 mph 59 / 57°F 89% 1012 mb
Low level cloud: 92%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

8 / 13 mph 57 / 55°F 87% 1013 mb
Low level cloud: 87%
Mid level cloud: 37%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

ENE
ENE

7 / 12 mph 55 / 53°F 89% 1014 mb
Low level cloud: 63%
Mid level cloud: 29%
High level cloud: 11%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

6 / 11 mph 53 / 51°F 90% 1015 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
06:00

NNE
NNE

6 / 12 mph 54 / 50°F 88% 1015 mb
Low level cloud: 10%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

4 / 8 mph 56 / 54°F 81% 1016 mb
Low level cloud: 8%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

10 / 15 mph 59 / 55°F 83% 1016 mb
Low level cloud: 59%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

9 / 13 mph 61 / 59°F 85% 1016 mb
Low level cloud: 54%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

11 / 17 mph 59 / 55°F 90% 1016 mb
Low level cloud: 50%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

6 / 10 mph 58 / 55°F 92% 1017 mb
Low level cloud: 32%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

E
E

6 / 11 mph 53 / 51°F 92% 1017 mb
Low level cloud: 39%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

6 / 12 mph 51 / 48°F 90% 1018 mb
Low level cloud: 20%
Mid level cloud: 25%
High level cloud: 30%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

6 / 11 mph 53 / 49°F 88% 1018 mb
Low level cloud: 17%
Mid level cloud: 29%
High level cloud: 68%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

6 / 7 mph 59 / 57°F 79% 1019 mb
Low level cloud: 50%
Mid level cloud: 15%
High level cloud: 30%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

4 / 5 mph 60 / 59°F 77% 1019 mb
Low level cloud: 78%
Mid level cloud: 24%
High level cloud: 80%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

6 / 9 mph 60 / 60°F 74% 1019 mb
Low level cloud: 90%
Mid level cloud: 23%
High level cloud: 59%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

13 / 18 mph 59 / 55°F 80% 1019 mb
Low level cloud: 48%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

10 / 17 mph 53 / 49°F 84% 1021 mb
Low level cloud: 27%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

E
E

8 / 13 mph 49 / 46°F 85% 1021 mb
Low level cloud: 2%
Mid level cloud: 68%
High level cloud: 22%
Most Significant Cloud Type: medium
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

7 / 13 mph 46 / 43°F 83% 1021 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 7%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

7 / 11 mph 46 / 42°F 75% 1022 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 10%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

6 / 7 mph 54 / 51°F 63% 1022 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 5%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

2 / 2 mph 58 / 58°F 59% 1021 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

3 / 4 mph 62 / 60°F 60% 1019 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
18:00

NE
NE

4 / 4 mph 62 / 60°F 70% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

7 / 12 mph 53 / 49°F 79% 1019 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
Tue 21
May
00:00

ENE
ENE

8 / 13 mph 48 / 44°F 81% 1018 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
03:00

E
E

7 / 12 mph 45 / 41°F 84% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

6 / 11 mph 46 / 42°F 83% 1017 mb
Low level cloud: 32%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

7 / 8 mph 56 / 52°F 71% 1017 mb
Low level cloud: 50%
Mid level cloud: 25%
High level cloud: 13%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

3 / 4 mph 60 / 59°F 66% 1016 mb
Low level cloud: 20%
Mid level cloud: 28%
High level cloud: 32%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

1 / 1 mph 65 / 62°F 64% 1015 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 9%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

6 / 7 mph 65 / 62°F 79% 1015 mb
Low level cloud: 47%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

10 / 14 mph 55 / 51°F 89% 1016 mb
Low level cloud: 46%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: low
63%
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

W
W

6 / 12 mph 52 / 49°F 98% 1007 mb
Low level cloud: 100%
Mid level cloud: 64%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

8 / 16 mph 47 / 43°F 76% 1014 mb
Low level cloud: 36%
Mid level cloud: 42%
High level cloud: 10%
Most Significant Cloud Type: low
52%
0.0 In
12:00

NE
NE

15 / 31 mph 57 / 53°F 90% 1014 mb
Low level cloud: 10%
Mid level cloud: 78%
High level cloud: 97%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

NE
NE

11 / 24 mph 50 / 46°F 85% 1016 mb
Low level cloud: 95%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Thu 23
May
00:00

NE
NE

11 / 22 mph 54 / 50°F 91% 1015 mb
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 56%
Most Significant Cloud Type: medium
53%
0.0 In
06:00

SSE
SSE

11 / 23 mph 51 / 47°F 89% 1017 mb
Low level cloud: 30%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: low
47%
0.0 In
12:00

NNE
NNE

9 / 17 mph 56 / 54°F 69% 1025 mb
Low level cloud: 3%
Mid level cloud: 22%
High level cloud: 82%
Most Significant Cloud Type: medium
32%
0.0 In
18:00

ENE
ENE

14 / 28 mph 62 / 62°F 77% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 21%
Most Significant Cloud Type: high
21%
0.0 In
Fri 24
May
00:00

NE
NE

14 / 26 mph 51 / 46°F 77% 1025 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 12%
Most Significant Cloud Type: medium
28%
0.0 In
06:00

NE
NE

10 / 19 mph 50 / 46°F 84% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
0.0 In
12:00

E
E

13 / 25 mph 62 / 62°F 72% 1023 mb
Low level cloud: 21%
Mid level cloud: 17%
High level cloud: 5%
Most Significant Cloud Type: low
27%
0.0 In
18:00

NE
NE

4 / 7 mph 65 / 65°F 76% 1020 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
20%
0.0 In
Sat 25
May
00:00

ENE
ENE

11 / 21 mph 54 / 51°F 83% 1021 mb
Low level cloud: 76%
Mid level cloud: 47%
High level cloud: 6%
Most Significant Cloud Type: low
93%
0.0 In
06:00

ESE
ESE

4 / 9 mph 55 / 55°F 85% 1020 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: low
5%
0.0 In
12:00

ESE
ESE

9 / 18 mph 57 / 55°F 90% 1019 mb
Low level cloud: 98%
Mid level cloud: 82%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

4 / 9 mph 65 / 65°F 76% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 9%
Most Significant Cloud Type: medium
5%
0.0 In
Sun 26
May
00:00

NW
NW

6 / 12 mph 58 / 57°F 89% 1020 mb
Low level cloud: 18%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
19%
0.0 In
06:00

NW
NW

7 / 14 mph 52 / 49°F 90% 1017 mb
Low level cloud: 20%
Mid level cloud: 29%
High level cloud: 20%
Most Significant Cloud Type: low
32%
0.0 In
12:00

E
E

6 / 13 mph 63 / 63°F 79% 1020 mb
Low level cloud: 65%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
71%
0.0 In
18:00

WNW
WNW

15 / 30 mph 55 / 51°F 74% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
13%
0.0 In
Mon 27
May
00:00

ENE
ENE

11 / 21 mph 55 / 53°F 88% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 72%
Most Significant Cloud Type: high
72%
0.0 In
06:00

NW
NW

13 / 26 mph 48 / 43°F 86% 1018 mb
Low level cloud: 11%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
80%
0.0 In
12:00

ENE
ENE

8 / 15 mph 63 / 63°F 64% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
0.0 In
18:00

WNW
WNW

14 / 28 mph 54 / 50°F 92% 1019 mb
Low level cloud: 88%
Mid level cloud: 52%
High level cloud: 47%
Most Significant Cloud Type: low
100%
0.0 In
Tue 28
May
00:00

NE
NE

7 / 16 mph 53 / 51°F 86% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

NW
NW

12 / 24 mph 46 / 41°F 79% 1021 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 19%
Most Significant Cloud Type: medium
14%
0.0 In
12:00

NE
NE

22 / 45 mph 63 / 64°F 71% 1010 mb
Low level cloud: 13%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

WSW
WSW

12 / 23 mph 52 / 48°F 78% 1020 mb
Low level cloud: 19%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: low
38%
0.0 In
Wed 29
May
00:00

NE
NE

11 / 21 mph 56 / 53°F 90% 1011 mb
Low level cloud: 1%
Mid level cloud: 15%
High level cloud: 32%
Most Significant Cloud Type: medium
19%
0.0 In
06:00

W
W

21 / 41 mph 50 / 43°F 80% 1016 mb
Low level cloud: 54%
Mid level cloud: 43%
High level cloud: 36%
Most Significant Cloud Type: low
73%
0.0 In
12:00

NE
NE

15 / 29 mph 67 / 67°F 73% 1008 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 18%
Most Significant Cloud Type: medium
44%
0.0 In
18:00

WNW
WNW

17 / 34 mph 54 / 49°F 83% 1012 mb
Low level cloud: 79%
Mid level cloud: 28%
High level cloud: 32%
Most Significant Cloud Type: low
92%
0.1 In
Thu 30
May
00:00

ENE
ENE

8 / 16 mph 57 / 55°F 89% 1007 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

WNW
WNW

16 / 32 mph 50 / 44°F 82% 1012 mb
Low level cloud: 57%
Mid level cloud: 43%
High level cloud: 13%
Most Significant Cloud Type: low
73%
0.0 In
12:00

W
W

3 / 6 mph 61 / 61°F 86% 1006 mb
Low level cloud: 84%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.0 In
18:00

W
W

8 / 15 mph 53 / 50°F 79% 1013 mb
Low level cloud: 78%
Mid level cloud: 68%
High level cloud: 79%
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