WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

West Cliff 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for West Cliff

North Yorkshire, United Kingdom

Long range weather outlook for West Cliff includes 14 day forecast summary:

The outlook for West Cliff in the two weeks ahead shows the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 20°C expected on the afternoon of Saturday 25th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Monday 20th at 8°C. The next 14 days will have mixed overhead conditions with some days dry and some seeing a significant amount of rain. It looks like Wednesday 22nd will have the most precipitation with an accumulation of around 10.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Fri 17
May
03:00

N
N

2 / 4 kts 50 / 50°F 99%
Low level cloud: 89%
Mid level cloud: 17%
High level cloud: 36%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

5 / 9 kts 49 / 47°F 96%
Low level cloud: 85%
Mid level cloud: 47%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

4 / 8 kts 52 / 49°F 93%
Low level cloud: 65%
Mid level cloud: 19%
High level cloud: 54%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

4 / 7 kts 54 / 51°F 93%
Low level cloud: 72%
Mid level cloud: 15%
High level cloud: 61%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

4 / 6 kts 56 / 53°F 93%
Low level cloud: 51%
Mid level cloud: 14%
High level cloud: 10%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

4 / 6 kts 54 / 52°F 95%
Low level cloud: 69%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

5 / 7 kts 53 / 50°F 97%
Low level cloud: 78%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

NNW
NNW

6 / 10 kts 51 / 48°F 98%
Low level cloud: 99%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

6 / 13 kts 49 / 46°F 99%
Low level cloud: 88%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

8 / 17 kts 49 / 44°F 97%
Low level cloud: 83%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

9 / 16 kts 52 / 47°F 94%
Low level cloud: 63%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

8 / 13 kts 55 / 51°F 88%
Low level cloud: 5%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

9 / 12 kts 57 / 53°F 85%
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

NNW
NNW

7 / 10 kts 55 / 52°F 89%
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

7 / 10 kts 53 / 49°F 96%
Low level cloud: 20%
Mid level cloud: 3%
High level cloud: 2%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NW
NW

9 / 12 kts 51 / 47°F 98%
Low level cloud: 54%
Mid level cloud: 1%
High level cloud: 3%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

10 / 16 kts 49 / 45°F 97%
Low level cloud: 73%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

11 / 19 kts 48 / 43°F 95%
Low level cloud: 74%
Mid level cloud: 6%
High level cloud: 7%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

12 / 15 kts 52 / 47°F 93%
Low level cloud: 66%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

11 / 13 kts 56 / 51°F 90%
Low level cloud: 51%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

10 / 12 kts 58 / 54°F 92%
Low level cloud: 61%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

9 / 11 kts 56 / 52°F 91%
Low level cloud: 42%
Mid level cloud: 24%
High level cloud: 1%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

8 / 9 kts 53 / 49°F 94%
Low level cloud: 38%
Mid level cloud: 29%
High level cloud: 16%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

N
N

8 / 10 kts 51 / 48°F 94%
Low level cloud: 33%
Mid level cloud: 19%
High level cloud: 20%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

8 / 12 kts 49 / 45°F 92%
Low level cloud: 14%
Mid level cloud: 17%
High level cloud: 10%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

10 / 17 kts 48 / 42°F 87%
Low level cloud: 2%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

11 / 12 kts 53 / 47°F 79%
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
12:00

N
N

11 / 13 kts 57 / 54°F 79%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

11 / 13 kts 60 / 59°F 82%
Low level cloud: 1%
Mid level cloud: 79%
High level cloud: 83%
Most Significant Cloud Type: medium
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

11 / 12 kts 58 / 54°F 87%
Low level cloud: 37%
Mid level cloud: 27%
High level cloud: 2%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

9 / 10 kts 54 / 50°F 94%
Low level cloud: 74%
Mid level cloud: 13%
High level cloud: 12%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NNW
NNW

8 / 9 kts 52 / 49°F 96%
Low level cloud: 93%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

9 / 14 kts 50 / 45°F 98%
Low level cloud: 94%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

8 / 15 kts 48 / 44°F 98%
Low level cloud: 99%
Mid level cloud: 25%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

6 / 8 kts 53 / 50°F 96%
Low level cloud: 94%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

3 / 4 kts 58 / 57°F 90%
Low level cloud: 75%
Mid level cloud: 17%
High level cloud: 18%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

3 / 4 kts 63 / 60°F 90%
Low level cloud: 51%
Mid level cloud: 45%
High level cloud: 18%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

4 / 5 kts 59 / 57°F 89%
Low level cloud: 34%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

2 / 4 kts 54 / 54°F 93%
Low level cloud: 21%
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
Wed 22
May
00:00

ENE
ENE

2 / 4 kts 53 / 53°F 94%
Low level cloud: 48%
Mid level cloud: 89%
High level cloud: 35%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

3 / 6 kts 51 / 50°F 96%
Low level cloud: 63%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

3 / 6 kts 50 / 49°F 98%
Low level cloud: 93%
Mid level cloud: 100%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

4 / 6 kts 53 / 51°F 98%
Low level cloud: 100%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

WNW
WNW

4 / 5 kts 56 / 55°F 98%
Low level cloud: 97%
Mid level cloud: 100%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

NW
NW

3 / 4 kts 58 / 58°F 95%
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NE
NE

1 / 2 kts 58 / 58°F 94%
Low level cloud: 55%
Mid level cloud: 45%
High level cloud: 26%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

2 / 4 kts 56 / 54°F 95%
Low level cloud: 27%
Mid level cloud: 27%
High level cloud: 17%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
00:00

SW
SW

1 / 3 kts 53 / 54°F 94%
Low level cloud: 15%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

2 / 4 kts 52 / 52°F 91%
Low level cloud: 8%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

4 / 10 kts 52 / 48°F 90%
Low level cloud: 8%
Mid level cloud: 10%
High level cloud: 18%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

6 / 13 kts 54 / 50°F 80%
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 32%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

N
N

7 / 10 kts 57 / 53°F 81%
Low level cloud: 5%
Mid level cloud: 32%
High level cloud: 19%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

7 / 8 kts 58 / 55°F 89%
Low level cloud: 32%
Mid level cloud: 39%
High level cloud: 30%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

8 / 10 kts 56 / 53°F 94%
Low level cloud: 68%
Mid level cloud: 12%
High level cloud: 12%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

8 / 9 kts 54 / 50°F 92%
Low level cloud: 63%
Mid level cloud: 18%
High level cloud: 4%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Fri 24
May
00:00

W
W

6 / 11 kts 48 / 44°F 89%
Low level cloud: 2%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.0 In
06:00

WSW
WSW

8 / 11 kts 48 / 44°F 76%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: high
19%
0.0 In
12:00

E
E

13 / 18 kts 54 / 50°F 82%
Low level cloud: 41%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
41%
0.0 In
18:00

NE
NE

6 / 11 kts 57 / 56°F 86%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
Sat 25
May
00:00

NE
NE

6 / 10 kts 52 / 50°F 93%
Low level cloud: 5%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
06:00

W
W

3 / 5 kts 54 / 54°F 88%
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 9%
Most Significant Cloud Type: high
8%
0.0 In
12:00

ENE
ENE

8 / 11 kts 56 / 53°F 84%
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
7%
0.0 In
18:00

WNW
WNW

6 / 9 kts 62 / 62°F 80%
Low level cloud: 10%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
46%
0.0 In
Sun 26
May
00:00

ENE
ENE

6 / 10 kts 53 / 50°F 93%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
6%
0.0 In
06:00

SW
SW

8 / 16 kts 54 / 51°F 94%
Low level cloud: 91%
Mid level cloud: 87%
High level cloud: 20%
Most Significant Cloud Type: low
100%
0.0 In
12:00

ENE
ENE

12 / 16 kts 57 / 54°F 82%
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 61%
Most Significant Cloud Type: medium
33%
0.0 In
18:00

NNE
NNE

3 / 5 kts 59 / 59°F 83%
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: low
7%
0.0 In
Mon 27
May
00:00

NE
NE

4 / 6 kts 52 / 51°F 95%
Low level cloud: 46%
Mid level cloud: 14%
High level cloud: 16%
Most Significant Cloud Type: low
52%
0.0 In
06:00

S
S

4 / 7 kts 53 / 52°F 83%
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 38%
Most Significant Cloud Type: medium
27%
0.0 In
12:00

N
N

8 / 12 kts 56 / 53°F 72%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: high
18%
0.0 In
18:00

W
W

9 / 16 kts 63 / 63°F 81%
Low level cloud: 4%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
Tue 28
May
00:00

NNW
NNW

6 / 11 kts 50 / 47°F 95%
Low level cloud: 52%
Mid level cloud: 1%
High level cloud: 10%
Most Significant Cloud Type: low
53%
0.0 In
06:00

WSW
WSW

3 / 5 kts 58 / 58°F 94%
Low level cloud: 86%
Mid level cloud: 29%
High level cloud: 19%
Most Significant Cloud Type: low
98%
0.0 In
12:00

NNW
NNW

9 / 12 kts 54 / 51°F 85%
Low level cloud: 54%
Mid level cloud: 2%
High level cloud: 13%
Most Significant Cloud Type: low
56%
0.0 In
18:00

NW
NW

9 / 14 kts 47 / 42°F 93%
Low level cloud: 80%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.4 In
Wed 29
May
00:00

NW
NW

4 / 9 kts 47 / 44°F 89%
Low level cloud: 1%
Mid level cloud: 1%
High level cloud: 1%
Most Significant Cloud Type: low
1%
0.0 In
06:00

W
W

9 / 14 kts 47 / 42°F 80%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.1 In
12:00

N
N

5 / 7 kts 57 / 56°F 76%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
18:00

W
W

11 / 20 kts 55 / 51°F 71%
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 10%
Most Significant Cloud Type: medium
13%
0.1 In
Thu 30
May
00:00

N
N

2 / 4 kts 52 / 52°F 93%
Low level cloud: 16%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
06:00

W
W

10 / 19 kts 48 / 43°F 79%
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
12:00

NNE
NNE

7 / 9 kts 59 / 59°F 75%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: medium
3%
0.0 In
18:00

SSE
SSE

4 / 8 kts 55 / 54°F 77%
Low level cloud: 38%
Mid level cloud: 10%
High level cloud: 18%
Most Significant Cloud Type: low
43%
0.0 In
Fri 31
May
00:00

N
N

4 / 6 kts 53 / 52°F 86%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

S
S

13 / 25 kts 47 / 40°F 82%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
0.0 In
12:00

NNE
NNE

8 / 11 kts 57 / 55°F 79%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
14%
0.0 In
18:00

SSW
SSW

9 / 17 kts 55 / 52°F 95%
Low level cloud: 81%
Mid level cloud: 14%
High level cloud: 2%
Most Significant Cloud Type: low
86%
0.2 In
Sat 01
Jun
00:00

NNW
NNW

7 / 10 kts 54 / 51°F 91%
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
8%
0.0 In
06:00

SW
SW

6 / 12 kts 52 / 49°F 94%
Low level cloud: 28%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
29%
0.0 In
12:00

N
N

12 / 16 kts 58 / 55°F 81%
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
18:00

S
S

11 / 22 kts 58 / 56°F 71%
Low level cloud: 6%
Mid level cloud: 31%
High level cloud: 41%
Most Significant Cloud Type: medium
48%
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