WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Drift 14 Day Long Range Forecast

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

Cornwall, United Kingdom

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

Taking a look at Drift over the coming two weeks and the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 19°C expected on the afternoon of Monday 20th. The mean minimum temperature will be 13°C, dipping to its lowest on the morning of Thursday 23rd at 11°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Current predictions suggest Saturday 25th will have the most precipitation with an accumulation of around 2.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May
18:00

E
E

9 / 11 mph 61 / 59°F 84% 1011 mb
Low level cloud: 6%
Mid level cloud: 15%
High level cloud: 89%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

8 / 10 mph 58 / 56°F 88% 1013 mb
Low level cloud: 5%
Mid level cloud: 100%
High level cloud: 73%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

ENE
ENE

6 / 8 mph 57 / 56°F 88% 1013 mb
Low level cloud: 4%
Mid level cloud: 72%
High level cloud: 33%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

4 / 6 mph 56 / 56°F 88% 1014 mb
Low level cloud: 2%
Mid level cloud: 100%
High level cloud: 48%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

9 / 15 mph 56 / 52°F 89% 1014 mb
Low level cloud: 7%
Mid level cloud: 46%
High level cloud: 94%
Most Significant Cloud Type: medium
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

9 / 14 mph 58 / 54°F 85% 1015 mb
Low level cloud: 1%
Mid level cloud: 43%
High level cloud: 65%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

10 / 14 mph 60 / 56°F 85% 1015 mb
Low level cloud: 2%
Mid level cloud: 52%
High level cloud: 32%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

11 / 13 mph 60 / 59°F 87% 1015 mb
Low level cloud: 6%
Mid level cloud: 59%
High level cloud: 12%
Most Significant Cloud Type: medium
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

8 / 10 mph 60 / 57°F 90% 1015 mb
Low level cloud: 33%
Mid level cloud: 76%
High level cloud: 6%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

7 / 9 mph 59 / 56°F 94% 1015 mb
Low level cloud: 52%
Mid level cloud: 64%
High level cloud: 2%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

N
N

7 / 10 mph 57 / 56°F 95% 1014 mb
Low level cloud: 43%
Mid level cloud: 43%
High level cloud: 30%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

5 / 9 mph 57 / 56°F 93% 1014 mb
Low level cloud: 20%
Mid level cloud: 25%
High level cloud: 1%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

7 / 12 mph 57 / 54°F 91% 1015 mb
Low level cloud: 18%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

9 / 15 mph 59 / 55°F 89% 1015 mb
Low level cloud: 42%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

9 / 12 mph 62 / 60°F 85% 1015 mb
Low level cloud: 42%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

6 / 8 mph 64 / 61°F 86% 1015 mb
Low level cloud: 38%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

5 / 7 mph 63 / 61°F 87% 1015 mb
Low level cloud: 15%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

8 / 12 mph 60 / 58°F 87% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

ENE
ENE

7 / 12 mph 58 / 57°F 89% 1015 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

6 / 11 mph 57 / 56°F 88% 1014 mb
Low level cloud: 5%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

9 / 16 mph 57 / 53°F 90% 1014 mb
Low level cloud: 5%
Mid level cloud: 19%
High level cloud: 2%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

11 / 14 mph 60 / 57°F 88% 1014 mb
Low level cloud: 31%
Mid level cloud: 16%
High level cloud: 2%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

9 / 11 mph 64 / 63°F 76% 1013 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
15:00

ENE
ENE

6 / 6 mph 67 / 65°F 75% 1012 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
18:00

N
N

3 / 3 mph 67 / 65°F 76% 1011 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

7 / 8 mph 65 / 63°F 82% 1011 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NNE
NNE

6 / 9 mph 59 / 59°F 89% 1010 mb
Low level cloud: 4%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

4 / 7 mph 57 / 56°F 86% 1010 mb
Low level cloud: 36%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

4 / 6 mph 57 / 55°F 86% 1010 mb
Low level cloud: 33%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

2 / 3 mph 60 / 59°F 84% 1010 mb
Low level cloud: 3%
Mid level cloud: 13%
High level cloud: 5%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

4 / 5 mph 63 / 61°F 81% 1010 mb
Low level cloud: 13%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

9 / 11 mph 64 / 62°F 83% 1010 mb
Low level cloud: 9%
Mid level cloud: 13%
High level cloud: 20%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

9 / 10 mph 63 / 61°F 85% 1011 mb
Low level cloud: 10%
Mid level cloud: 8%
High level cloud: 3%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

10 / 12 mph 60 / 59°F 87% 1012 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 36%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NW
NW

8 / 11 mph 58 / 56°F 85% 1012 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 52%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

8 / 11 mph 57 / 55°F 83% 1012 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 31%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

9 / 14 mph 56 / 53°F 88% 1013 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

12 / 17 mph 58 / 54°F 91% 1013 mb
Low level cloud: 31%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

13 / 15 mph 60 / 59°F 89% 1014 mb
Low level cloud: 30%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

14 / 16 mph 62 / 60°F 91% 1014 mb
Low level cloud: 60%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

17 / 20 mph 60 / 59°F 91% 1015 mb
Low level cloud: 63%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

16 / 18 mph 58 / 54°F 92% 1017 mb
Low level cloud: 79%
Mid level cloud: 24%
High level cloud: 21%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

NNW
NNW

13 / 20 mph 54 / 50°F 90% 1017 mb
Low level cloud: 24%
Mid level cloud: 39%
High level cloud: 90%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

18 / 28 mph 52 / 47°F 82% 1018 mb
Low level cloud: 10%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: medium
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

18 / 29 mph 52 / 46°F 79% 1018 mb
Low level cloud: 46%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

17 / 19 mph 55 / 49°F 76% 1019 mb
Low level cloud: 36%
Mid level cloud: 23%
High level cloud: 4%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

15 / 18 mph 57 / 53°F 72% 1019 mb
Low level cloud: 10%
Mid level cloud: 24%
High level cloud: 1%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

16 / 18 mph 59 / 55°F 71% 1019 mb
Low level cloud: 7%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

13 / 15 mph 57 / 53°F 70% 1019 mb
Low level cloud: 4%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

9 / 11 mph 57 / 53°F 70% 1020 mb
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May
00:00

NNW
NNW

14 / 23 mph 54 / 50°F 90% 1015 mb
Low level cloud: 30%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: low
31%
0.0 In
06:00

NNE
NNE

17 / 25 mph 54 / 49°F 84% 1013 mb
Low level cloud: 11%
Mid level cloud: 44%
High level cloud: 94%
Most Significant Cloud Type: medium
78%
0.0 In
12:00

ESE
ESE

19 / 38 mph 58 / 55°F 85% 1013 mb
Low level cloud: 17%
Mid level cloud: 12%
High level cloud: 2%
Most Significant Cloud Type: low
21%
0.0 In
18:00

E
E

19 / 39 mph 58 / 54°F 91% 1014 mb
Low level cloud: 37%
Mid level cloud: 43%
High level cloud: 4%
Most Significant Cloud Type: low
53%
0.0 In
Sat 25
May
00:00

NNW
NNW

13 / 26 mph 56 / 53°F 93% 1020 mb
Low level cloud: 89%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SW
SW

10 / 20 mph 54 / 51°F 88% 1026 mb
Low level cloud: 99%
Mid level cloud: 24%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

17 / 31 mph 57 / 53°F 78% 1021 mb
Low level cloud: 64%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
18:00

S
S

13 / 19 mph 58 / 55°F 86% 1018 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
0.0 In
Sun 26
May
00:00

SSE
SSE

10 / 16 mph 57 / 54°F 94% 1010 mb
Low level cloud: 37%
Mid level cloud: 3%
High level cloud: 71%
Most Significant Cloud Type: low
46%
0.0 In
06:00

S
S

19 / 29 mph 54 / 49°F 88% 1016 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SE
SE

2 / 4 mph 59 / 59°F 87% 1009 mb
Low level cloud: 56%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: low
79%
0.1 In
18:00

WNW
WNW

20 / 31 mph 56 / 51°F 78% 1018 mb
Low level cloud: 15%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.1 In
Mon 27
May
00:00

ENE
ENE

7 / 12 mph 56 / 55°F 92% 1011 mb
Low level cloud: 82%
Mid level cloud: 6%
High level cloud: 7%
Most Significant Cloud Type: low
85%
0.0 In
06:00

NW
NW

17 / 27 mph 53 / 48°F 67% 1021 mb
Low level cloud: 40%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.0 In
12:00

NE
NE

10 / 17 mph 58 / 56°F 92% 1014 mb
Low level cloud: 96%
Mid level cloud: 43%
High level cloud: 13%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NW
NW

13 / 21 mph 54 / 51°F 66% 1023 mb
Low level cloud: 45%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.0 In
Tue 28
May
00:00

NNE
NNE

10 / 17 mph 57 / 55°F 92% 1015 mb
Low level cloud: 5%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: low
7%
0.0 In
06:00

NW
NW

8 / 13 mph 53 / 50°F 72% 1025 mb
Low level cloud: 42%
Mid level cloud: 12%
High level cloud: 32%
Most Significant Cloud Type: low
49%
0.0 In
12:00

NNW
NNW

4 / 7 mph 62 / 62°F 85% 1014 mb
Low level cloud: 7%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: medium
35%
0.0 In
18:00

NW
NW

9 / 15 mph 54 / 52°F 66% 1026 mb
Low level cloud: 11%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
41%
0.0 In
Wed 29
May
00:00

WNW
WNW

13 / 22 mph 55 / 52°F 94% 1012 mb
Low level cloud: 65%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: low
87%
0.0 In
06:00

SW
SW

15 / 25 mph 53 / 48°F 74% 1022 mb
Low level cloud: 29%
Mid level cloud: 84%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

WNW
WNW

15 / 26 mph 58 / 55°F 67% 1015 mb
Low level cloud: 41%
Mid level cloud: 3%
High level cloud: 22%
Most Significant Cloud Type: low
44%
0.0 In
18:00

W
W

14 / 23 mph 58 / 55°F 97% 1018 mb
Low level cloud: 94%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
Thu 30
May
00:00

W
W

19 / 34 mph 54 / 49°F 68% 1014 mb
Low level cloud: 61%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.0 In
06:00

N
N

19 / 32 mph 54 / 49°F 80% 1020 mb
Low level cloud: 50%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: low
58%
0.0 In
12:00

WSW
WSW

19 / 36 mph 56 / 51°F 70% 1013 mb
Low level cloud: 38%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
85%
0.1 In
18:00

NNW
NNW

16 / 27 mph 56 / 53°F 76% 1024 mb
Low level cloud: 5%
Mid level cloud: 11%
High level cloud: 30%
Most Significant Cloud Type: low
13%
0.0 In
Fri 31
May
00:00

WNW
WNW

19 / 39 mph 53 / 48°F 72% 1010 mb
Low level cloud: 47%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.2 In
06:00

WNW
WNW

7 / 12 mph 55 / 54°F 83% 1024 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
12:00

NW
NW

19 / 41 mph 53 / 48°F 68% 1015 mb
Low level cloud: 35%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
37%
0.1 In
18:00

WSW
WSW

17 / 28 mph 58 / 54°F 80% 1023 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 36%
Most Significant Cloud Type: medium
13%
0.0 In
Sat 01
Jun
00:00

NW
NW

14 / 30 mph 54 / 50°F 72% 1018 mb
Low level cloud: 5%
Mid level cloud: 7%
High level cloud: 9%
Most Significant Cloud Type: low
8%
0.0 In
06:00

WSW
WSW

12 / 21 mph 57 / 54°F 96% 1022 mb
Low level cloud: 96%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
96%
0.0 In
12:00

SSW
SSW

6 / 13 mph 56 / 55°F 69% 1020 mb
Low level cloud: 78%
Mid level cloud: 58%
High level cloud: 11%
Most Significant Cloud Type: low
99%
0.0 In
18:00

WSW
WSW

9 / 16 mph 58 / 56°F 81% 1024 mb
Low level cloud: 1%
Mid level cloud: 14%
High level cloud: 12%
Most Significant Cloud Type: medium
17%
0.0 In

Other Locations Near to Drift

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