WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Cassington 14 Day Long Range Forecast

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

Oxfordshire, United Kingdom

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

Reviewing the forecast for Cassington Over the next 14 days and the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 19°C expected on the afternoon of Sunday 19th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Tuesday 21st at 5°C. The coming 14 days will 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 6.0mm. On the whole winds are likely to be moderate.

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

NE
NE

6 / 9 mph 66 / 63°F 87% 1013 mb
Low level cloud: 30%
Mid level cloud: 24%
High level cloud: 1%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

8 / 14 mph 55 / 53°F 93% 1014 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
Sun 19
May
00:00

NNE
NNE

6 / 9 mph 53 / 51°F 94% 1015 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
03:00

N
N

7 / 12 mph 48 / 44°F 94% 1014 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

8 / 12 mph 48 / 44°F 95% 1015 mb
Low level cloud: 38%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

11 / 13 mph 60 / 57°F 80% 1015 mb
Low level cloud: 37%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

11 / 14 mph 67 / 65°F 69% 1015 mb
Low level cloud: 28%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

13 / 17 mph 66 / 65°F 66% 1014 mb
Low level cloud: 29%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

11 / 14 mph 65 / 64°F 80% 1015 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
21:00

NE
NE

8 / 14 mph 53 / 51°F 92% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NE
NE

8 / 13 mph 49 / 46°F 92% 1016 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
03:00

NNE
NNE

6 / 12 mph 46 / 42°F 93% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

8 / 13 mph 48 / 43°F 92% 1016 mb
Low level cloud: 26%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

12 / 14 mph 55 / 50°F 83% 1015 mb
Low level cloud: 43%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

12 / 13 mph 61 / 60°F 77% 1014 mb
Low level cloud: 63%
Mid level cloud: 0%
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

NE
NE

9 / 13 mph 62 / 60°F 81% 1013 mb
Low level cloud: 59%
Mid level cloud: 1%
High level cloud: 12%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

12 / 17 mph 59 / 56°F 83% 1012 mb
Low level cloud: 5%
Mid level cloud: 23%
High level cloud: 4%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

8 / 16 mph 50 / 46°F 91% 1013 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 13%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NNE
NNE

6 / 11 mph 45 / 42°F 91% 1012 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 15%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

6 / 9 mph 47 / 45°F 69% 1011 mb
Low level cloud: 0%
Mid level cloud: 71%
High level cloud: 13%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

7 / 11 mph 48 / 44°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 60%
High level cloud: 2%
Most Significant Cloud Type: medium
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

8 / 9 mph 56 / 52°F 75% 1010 mb
Low level cloud: 3%
Mid level cloud: 26%
High level cloud: 11%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

6 / 7 mph 61 / 61°F 73% 1009 mb
Low level cloud: 84%
Mid level cloud: 12%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

6 / 8 mph 62 / 62°F 74% 1009 mb
Low level cloud: 94%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

3 / 4 mph 63 / 60°F 86% 1009 mb
Low level cloud: 32%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

3 / 6 mph 58 / 57°F 88% 1009 mb
Low level cloud: 8%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NNW
NNW

3 / 6 mph 54 / 53°F 93% 1009 mb
Low level cloud: 11%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

4 / 7 mph 53 / 52°F 94% 1008 mb
Low level cloud: 10%
Mid level cloud: 75%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

4 / 6 mph 53 / 53°F 92% 1008 mb
Low level cloud: 22%
Mid level cloud: 68%
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

NW
NW

8 / 11 mph 56 / 54°F 87% 1008 mb
Low level cloud: 64%
Mid level cloud: 52%
High level cloud: 99%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

10 / 14 mph 57 / 54°F 77% 1008 mb
Low level cloud: 23%
Mid level cloud: 72%
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

WNW
WNW

9 / 12 mph 59 / 57°F 85% 1008 mb
Low level cloud: 50%
Mid level cloud: 77%
High level cloud: 91%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

6 / 9 mph 57 / 56°F 92% 1008 mb
Low level cloud: 26%
Mid level cloud: 96%
High level cloud: 15%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WSW
WSW

6 / 11 mph 56 / 53°F 94% 1008 mb
Low level cloud: 30%
Mid level cloud: 77%
High level cloud: 2%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

SW
SW

7 / 13 mph 51 / 49°F 97% 1008 mb
Low level cloud: 34%
Mid level cloud: 100%
High level cloud: 38%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

6 / 12 mph 50 / 47°F 96% 1008 mb
Low level cloud: 5%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

6 / 11 mph 54 / 49°F 96% 1009 mb
Low level cloud: 33%
Mid level cloud: 19%
High level cloud: 96%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

11 / 15 mph 57 / 55°F 90% 1009 mb
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

12 / 16 mph 60 / 60°F 82% 1009 mb
Low level cloud: 92%
Mid level cloud: 26%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

10 / 15 mph 61 / 61°F 82% 1010 mb
Low level cloud: 93%
Mid level cloud: 35%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SW
SW

9 / 13 mph 60 / 57°F 90% 1011 mb
Low level cloud: 17%
Mid level cloud: 46%
High level cloud: 87%
Most Significant Cloud Type: low
43%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WSW
WSW

6 / 11 mph 55 / 51°F 95% 1013 mb
Low level cloud: 17%
Mid level cloud: 32%
High level cloud: 93%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
00:00

SW
SW

4 / 8 mph 50 / 48°F 96% 1014 mb
Low level cloud: 21%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

4 / 9 mph 48 / 46°F 95% 1015 mb
Low level cloud: 35%
Mid level cloud: 9%
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

SSW
SSW

3 / 4 mph 52 / 51°F 92% 1016 mb
Low level cloud: 22%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

3 / 4 mph 59 / 59°F 77% 1016 mb
Low level cloud: 92%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

6 / 7 mph 66 / 63°F 69% 1016 mb
Low level cloud: 63%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

7 / 10 mph 65 / 63°F 75% 1016 mb
Low level cloud: 48%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

6 / 9 mph 65 / 62°F 83% 1017 mb
Low level cloud: 5%
Mid level cloud: 19%
High level cloud: 5%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

6 / 13 mph 55 / 52°F 94% 1019 mb
Low level cloud: 3%
Mid level cloud: 11%
High level cloud: 6%
Most Significant Cloud Type: medium
19%
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

NNE
NNE

13 / 28 mph 52 / 47°F 98% 1018 mb
Low level cloud: 83%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
89%
0.0 In
06:00

WNW
WNW

3 / 6 mph 58 / 59°F 93% 1024 mb
Low level cloud: 23%
Mid level cloud: 8%
High level cloud: 4%
Most Significant Cloud Type: low
26%
0.0 In
12:00

WSW
WSW

8 / 16 mph 58 / 57°F 61% 1021 mb
Low level cloud: 1%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
0.0 In
18:00

S
S

10 / 21 mph 63 / 63°F 79% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Sun 26
May
00:00

E
E

4 / 8 mph 58 / 58°F 94% 1014 mb
Low level cloud: 26%
Mid level cloud: 66%
High level cloud: 97%
Most Significant Cloud Type: low
61%
0.0 In
06:00

SE
SE

5 / 11 mph 54 / 53°F 90% 1020 mb
Low level cloud: 52%
Mid level cloud: 88%
High level cloud: 100%
Most Significant Cloud Type: low
95%
0.0 In
12:00

SSW
SSW

10 / 21 mph 62 / 62°F 67% 1006 mb
Low level cloud: 61%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
74%
0.0 In
18:00

SE
SE

7 / 15 mph 66 / 66°F 89% 1012 mb
Low level cloud: 4%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: medium
93%
0.0 In
Mon 27
May
00:00

SW
SW

6 / 13 mph 51 / 49°F 98% 1016 mb
Low level cloud: 51%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SW
SW

4 / 8 mph 55 / 55°F 98% 1011 mb
Low level cloud: 89%
Mid level cloud: 29%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.3 In
12:00

SW
SW

17 / 35 mph 62 / 62°F 69% 1015 mb
Low level cloud: 85%
Mid level cloud: 22%
High level cloud: 82%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSE
SSE

4 / 9 mph 62 / 62°F 87% 1009 mb
Low level cloud: 22%
Mid level cloud: 26%
High level cloud: 63%
Most Significant Cloud Type: low
38%
0.1 In
Tue 28
May
00:00

SW
SW

13 / 28 mph 56 / 52°F 94% 1012 mb
Low level cloud: 54%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
64%
0.1 In
06:00

SSW
SSW

1 / 3 mph 55 / 55°F 98% 1009 mb
Low level cloud: 98%
Mid level cloud: 51%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.2 In
12:00

WSW
WSW

19 / 40 mph 61 / 61°F 65% 1012 mb
Low level cloud: 58%
Mid level cloud: 15%
High level cloud: 32%
Most Significant Cloud Type: low
66%
0.0 In
18:00

SW
SW

11 / 24 mph 56 / 53°F 93% 1010 mb
Low level cloud: 79%
Mid level cloud: 45%
High level cloud: 8%
Most Significant Cloud Type: low
95%
0.1 In
Wed 29
May
00:00

SW
SW

14 / 29 mph 57 / 53°F 97% 1007 mb
Low level cloud: 99%
Mid level cloud: 98%
High level cloud: 88%
Most Significant Cloud Type: low
100%
0.2 In
06:00

WSW
WSW

8 / 16 mph 53 / 50°F 98% 1011 mb
Low level cloud: 78%
Mid level cloud: 26%
High level cloud: 16%
Most Significant Cloud Type: low
88%
0.0 In
12:00

W
W

13 / 28 mph 61 / 61°F 71% 1012 mb
Low level cloud: 55%
Mid level cloud: 9%
High level cloud: 96%
Most Significant Cloud Type: low
69%
0.1 In
18:00

SW
SW

11 / 24 mph 60 / 60°F 89% 1012 mb
Low level cloud: 49%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: low
64%
0.1 In
Thu 30
May
00:00

WSW
WSW

9 / 18 mph 49 / 45°F 97% 1014 mb
Low level cloud: 45%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.0 In
06:00

S
S

7 / 15 mph 55 / 53°F 96% 1012 mb
Low level cloud: 68%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: low
91%
0.0 In
12:00

WNW
WNW

6 / 13 mph 65 / 65°F 64% 1016 mb
Low level cloud: 69%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: low
70%
0.0 In
18:00

S
S

10 / 21 mph 60 / 60°F 89% 1007 mb
Low level cloud: 24%
Mid level cloud: 61%
High level cloud: 77%
Most Significant Cloud Type: low
54%
0.1 In
Fri 31
May
00:00

W
W

2 / 5 mph 55 / 56°F 93% 1019 mb
Low level cloud: 38%
Mid level cloud: 21%
High level cloud: 12%
Most Significant Cloud Type: low
46%
0.0 In
06:00

S
S

8 / 17 mph 55 / 53°F 97% 1004 mb
Low level cloud: 81%
Mid level cloud: 22%
High level cloud: 21%
Most Significant Cloud Type: low
90%
0.0 In
12:00

SW
SW

2 / 5 mph 64 / 64°F 67% 1019 mb
Low level cloud: 46%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
73%
0.0 In
18:00

SSW
SSW

12 / 25 mph 58 / 56°F 84% 1004 mb
Low level cloud: 10%
Mid level cloud: 8%
High level cloud: 22%
Most Significant Cloud Type: low
15%
0.2 In
Sat 01
Jun
00:00

SSE
SSE

4 / 8 mph 57 / 57°F 96% 1018 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SSE
SSE

5 / 11 mph 53 / 52°F 93% 1005 mb
Low level cloud: 40%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.0 In
12:00

SW
SW

10 / 21 mph 64 / 64°F 90% 1015 mb
Low level cloud: 90%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
18:00

SSW
SSW

11 / 24 mph 59 / 56°F 83% 1006 mb
Low level cloud: 4%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.1 In
Sun 02
Jun
00:00

SSE
SSE

6 / 12 mph 59 / 59°F 98% 1012 mb
Low level cloud: 42%
Mid level cloud: 45%
High level cloud: 99%
Most Significant Cloud Type: low
69%
0.1 In
06:00

S
S

7 / 15 mph 53 / 50°F 96% 1009 mb
Low level cloud: 66%
Mid level cloud: 19%
High level cloud: 51%
Most Significant Cloud Type: low
79%
0.0 In
12:00

WSW
WSW

17 / 35 mph 67 / 67°F 83% 1004 mb
Low level cloud: 91%
Mid level cloud: 14%
High level cloud: 22%
Most Significant Cloud Type: low
98%
0.1 In
18:00

WSW
WSW

10 / 21 mph 60 / 60°F 86% 1010 mb
Low level cloud: 4%
Mid level cloud: 20%
High level cloud: 15%
Most Significant Cloud Type: medium
32%
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