Fast Forecast

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Skipsea 14 Day Long Range Forecast

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

Yorkshire, United Kingdom

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

The next 14 day outlook for Skipsea shows the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 18°C expected on the afternoon of Friday 24th. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Wednesday 22nd at 8°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain. It looks like Thursday 23rd will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 14
May		18:00

SSE
SSE

 6 / 9 mph 57 / 56°F 91% 1002 mb
Low level cloud: 11%
Mid level cloud: 72%
High level cloud: 31%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 6 / 10 mph 55 / 54°F 92% 1004 mb
Low level cloud: 21%
Mid level cloud: 44%
High level cloud: 17%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 15
May		00:00

SE
SE

 5 / 10 mph 52 / 50°F 95% 1004 mb
Low level cloud: 17%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

 5 / 10 mph 50 / 49°F 94% 1005 mb
Low level cloud: 10%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 3 / 6 mph 52 / 52°F 93% 1006 mb
Low level cloud: 27%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 4 / 5 mph 55 / 55°F 90% 1006 mb
Low level cloud: 90%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 4 / 6 mph 59 / 57°F 86% 1007 mb
Low level cloud: 35%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 8 / 9 mph 63 / 61°F 76% 1006 mb
Low level cloud: 53%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 5 / 6 mph 58 / 56°F 90% 1007 mb
Low level cloud: 24%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 4 / 6 mph 53 / 53°F 95% 1008 mb
Low level cloud: 30%
Mid level cloud: 52%
High level cloud: 32%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May		00:00

ENE
ENE

 1 / 2 mph 52 / 52°F 95% 1008 mb
Low level cloud: 35%
Mid level cloud: 43%
High level cloud: 50%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 2 / 4 mph 50 / 51°F 96% 1008 mb
Low level cloud: 37%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 4 / 6 mph 56 / 53°F 92% 1008 mb
Low level cloud: 37%
Mid level cloud: 77%
High level cloud: 38%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 7 / 9 mph 61 / 60°F 81% 1008 mb
Low level cloud: 73%
Mid level cloud: 30%
High level cloud: 33%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 12 / 16 mph 57 / 55°F 89% 1008 mb
Low level cloud: 84%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

 13 / 15 mph 60 / 59°F 81% 1007 mb
Low level cloud: 40%
Mid level cloud: 11%
High level cloud: 33%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 12 / 16 mph 56 / 51°F 89% 1008 mb
Low level cloud: 37%
Mid level cloud: 10%
High level cloud: 22%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 12 / 17 mph 53 / 49°F 92% 1008 mb
Low level cloud: 52%
Mid level cloud: 86%
High level cloud: 1%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May		00:00

NE
NE

 13 / 19 mph 53 / 49°F 92% 1008 mb
Low level cloud: 71%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

 14 / 21 mph 52 / 48°F 95% 1008 mb
Low level cloud: 96%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

 14 / 21 mph 52 / 48°F 97% 1008 mb
Low level cloud: 100%
Mid level cloud: 47%
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

ENE
ENE

 13 / 18 mph 53 / 49°F 96% 1009 mb
Low level cloud: 97%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 9 / 12 mph 55 / 53°F 93% 1010 mb
Low level cloud: 96%
Mid level cloud: 43%
High level cloud: 29%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 11 / 14 mph 57 / 55°F 88% 1012 mb
Low level cloud: 95%
Mid level cloud: 43%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 11 / 16 mph 55 / 52°F 89% 1014 mb
Low level cloud: 71%
Mid level cloud: 45%
High level cloud: 14%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 6 / 11 mph 54 / 50°F 94% 1015 mb
Low level cloud: 25%
Mid level cloud: 44%
High level cloud: 11%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

NE
NE

 5 / 10 mph 49 / 47°F 98% 1016 mb
Low level cloud: 65%
Mid level cloud: 22%
High level cloud: 82%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 6 / 11 mph 49 / 46°F 99% 1016 mb
Low level cloud: 80%
Mid level cloud: 28%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 8 / 11 mph 53 / 50°F 94% 1016 mb
Low level cloud: 100%
Mid level cloud: 32%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 10 / 14 mph 55 / 51°F 92% 1017 mb
Low level cloud: 85%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

 12 / 14 mph 60 / 59°F 81% 1017 mb
Low level cloud: 51%
Mid level cloud: 81%
High level cloud: 1%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 13 / 15 mph 60 / 56°F 80% 1017 mb
Low level cloud: 1%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 11 / 14 mph 57 / 53°F 85% 1017 mb
Low level cloud: 9%
Mid level cloud: 13%
High level cloud: 6%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 7 / 15 mph 50 / 46°F 95% 1017 mb
Low level cloud: 10%
Mid level cloud: 2%
High level cloud: 17%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

NNE
NNE

 8 / 16 mph 48 / 45°F 95% 1017 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 9%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 8 / 17 mph 47 / 43°F 95% 1016 mb
Low level cloud: 3%
Mid level cloud: 9%
High level cloud: 8%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 10 / 16 mph 53 / 48°F 88% 1016 mb
Low level cloud: 6%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: medium
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 14 / 16 mph 61 / 59°F 71% 1016 mb
Low level cloud: 18%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 15 / 17 mph 63 / 61°F 65% 1016 mb
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 15 / 18 mph 62 / 60°F 66% 1016 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 12 / 17 mph 57 / 53°F 80% 1015 mb
Low level cloud: 11%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 9 / 18 mph 50 / 46°F 91% 1016 mb
Low level cloud: 14%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

N
N

 8 / 16 mph 50 / 47°F 89% 1016 mb
Low level cloud: 2%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 8 / 16 mph 48 / 44°F 91% 1016 mb
Low level cloud: 4%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 9 / 13 mph 53 / 49°F 83% 1016 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 11 / 13 mph 59 / 56°F 68% 1016 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 9%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 12 / 14 mph 61 / 60°F 62% 1016 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 13 / 15 mph 60 / 59°F 70% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 11 / 14 mph 56 / 53°F 80% 1016 mb
Low level cloud: 14%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 8 / 15 mph 50 / 45°F 94% 1016 mb
Low level cloud: 26%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 21
May		00:00

SE
SE

 5 / 11 mph 48 / 46°F 92% 1014 mb
Low level cloud: 8%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

N
N

 11 / 20 mph 47 / 42°F 83% 1025 mb
Low level cloud: 1%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
33%
0.0 In
12:00

SSE
SSE

 6 / 12 mph 51 / 49°F 93% 1015 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
Wed 22
May		00:00

WSW
WSW

 4 / 6 mph 54 / 54°F 98% 1006 mb
Low level cloud: 62%
Mid level cloud: 45%
High level cloud: 15%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNW
NNW

 10 / 14 mph 48 / 43°F 85% 1013 mb
Low level cloud: 92%
Mid level cloud: 27%
High level cloud: 87%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NE
NE

 14 / 26 mph 55 / 51°F 94% 1014 mb
Low level cloud: 66%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: low
96%
0.0 In
18:00

N
N

 14 / 26 mph 50 / 45°F 95% 1014 mb
Low level cloud: 92%
Mid level cloud: 100%
High level cloud: 59%
Most Significant Cloud Type: low
100%
0.0 In
Thu 23
May		00:00

N
N

 10 / 16 mph 50 / 46°F 97% 1014 mb
Low level cloud: 88%
Mid level cloud: 48%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNW
NNW

 14 / 26 mph 44 / 37°F 90% 1014 mb
Low level cloud: 86%
Mid level cloud: 100%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.2 In
12:00

N
N

 6 / 9 mph 53 / 52°F 98% 1012 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
18:00

NNW
NNW

 13 / 23 mph 49 / 44°F 96% 1015 mb
Low level cloud: 99%
Mid level cloud: 92%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.1 In
Fri 24
May		00:00

WSW
WSW

 5 / 8 mph 52 / 51°F 98% 1014 mb
Low level cloud: 88%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.0 In
06:00

NNE
NNE

 11 / 22 mph 48 / 43°F 93% 1019 mb
Low level cloud: 95%
Mid level cloud: 54%
High level cloud: 56%
Most Significant Cloud Type: low
100%
0.0 In
12:00

S
S

 7 / 12 mph 63 / 63°F 75% 1013 mb
Low level cloud: 71%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.0 In
18:00

NNE
NNE

 11 / 22 mph 51 / 47°F 71% 1024 mb
Low level cloud: 89%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
89%
0.0 In
Sat 25
May		00:00

SW
SW

 3 / 6 mph 58 / 58°F 94% 1010 mb
Low level cloud: 41%
Mid level cloud: 92%
High level cloud: 78%
Most Significant Cloud Type: low
82%
0.1 In
06:00

NE
NE

 5 / 9 mph 48 / 46°F 64% 1026 mb
Low level cloud: 79%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: low
83%
0.0 In
12:00

S
S

 9 / 18 mph 56 / 54°F 97% 1004 mb
Low level cloud: 99%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
18:00

ESE
ESE

 7 / 14 mph 51 / 48°F 71% 1023 mb
Low level cloud: 32%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
71%
0.0 In
Sun 26
May		00:00

SW
SW

 9 / 17 mph 49 / 46°F 90% 1002 mb
Low level cloud: 47%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.0 In
06:00

ESE
ESE

 7 / 15 mph 46 / 42°F 90% 1020 mb
Low level cloud: 98%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 14 / 28 mph 57 / 53°F 61% 1003 mb
Low level cloud: 91%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

 12 / 23 mph 49 / 44°F 98% 1016 mb
Low level cloud: 95%
Mid level cloud: 100%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.1 In
Mon 27
May		00:00

SW
SW

 7 / 15 mph 47 / 44°F 90% 1004 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 4%
Most Significant Cloud Type: medium
23%
0.0 In
06:00

WSW
WSW

 2 / 5 mph 55 / 56°F 97% 1012 mb
Low level cloud: 75%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: low
94%
0.2 In
12:00

SSW
SSW

 13 / 26 mph 60 / 60°F 53% 1005 mb
Low level cloud: 10%
Mid level cloud: 54%
High level cloud: 15%
Most Significant Cloud Type: medium
83%
0.0 In
18:00

ESE
ESE

 6 / 12 mph 58 / 57°F 96% 1011 mb
Low level cloud: 69%
Mid level cloud: 56%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Tue 28
May		00:00

SSW
SSW

 8 / 17 mph 50 / 46°F 96% 1007 mb
Low level cloud: 88%
Mid level cloud: 66%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.1 In
06:00

S
S

 8 / 15 mph 56 / 54°F 96% 1008 mb
Low level cloud: 40%
Mid level cloud: 8%
High level cloud: 39%
Most Significant Cloud Type: low
47%
0.3 In
12:00

W
W

 10 / 22 mph 59 / 59°F 66% 1010 mb
Low level cloud: 59%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
18:00

S
S

 10 / 20 mph 67 / 67°F 90% 1004 mb
Low level cloud: 8%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: low
16%
0.1 In
Wed 29
May		00:00

SSW
SSW

 4 / 9 mph 52 / 51°F 88% 1011 mb
Low level cloud: 4%
Mid level cloud: 45%
High level cloud: 20%
Most Significant Cloud Type: medium
57%
0.0 In
06:00

SSW
SSW

 2 / 4 mph 60 / 60°F 93% 1001 mb
Low level cloud: 16%
Mid level cloud: 20%
High level cloud: 45%
Most Significant Cloud Type: low
28%
0.0 In
12:00

SSW
SSW

 9 / 19 mph 56 / 54°F 90% 1012 mb
Low level cloud: 87%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ESE
ESE

 3 / 7 mph 65 / 65°F 98% 997 mb
Low level cloud: 54%
Mid level cloud: 64%
High level cloud: 32%
Most Significant Cloud Type: low
80%
0.3 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