WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Haddington 14 Day Long Range Forecast

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

Lincolnshire, United Kingdom

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

Over the next 14 days the Haddington forecast suggests 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 Saturday 25th. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Sunday 2nd at 6°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. The current forecast indicates Thursday 30th will have the most precipitation with an accumulation of around 18.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 23
May
18:00

WSW
WSW

14 / 16 mph 54 / 50°F 86% 1012 mb
Low level cloud: 92%
Mid level cloud: 62%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

12 / 14 mph 53 / 49°F 85% 1014 mb
Low level cloud: 98%
Mid level cloud: 45%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
00:00

SW
SW

11 / 15 mph 51 / 46°F 83% 1015 mb
Low level cloud: 99%
Mid level cloud: 45%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

10 / 14 mph 50 / 46°F 84% 1015 mb
Low level cloud: 89%
Mid level cloud: 45%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

7 / 10 mph 50 / 47°F 87% 1016 mb
Low level cloud: 100%
Mid level cloud: 31%
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

SW
SW

7 / 9 mph 55 / 53°F 80% 1018 mb
Low level cloud: 89%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

8 / 10 mph 58 / 56°F 75% 1018 mb
Low level cloud: 87%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

6 / 8 mph 61 / 59°F 70% 1019 mb
Low level cloud: 81%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

5 / 7 mph 60 / 58°F 81% 1019 mb
Low level cloud: 30%
Mid level cloud: 7%
High level cloud: 7%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

6 / 13 mph 53 / 49°F 91% 1020 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 26%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May
00:00

SE
SE

5 / 10 mph 48 / 46°F 93% 1020 mb
Low level cloud: 25%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

3 / 7 mph 47 / 46°F 91% 1019 mb
Low level cloud: 67%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

3 / 5 mph 54 / 51°F 89% 1019 mb
Low level cloud: 33%
Mid level cloud: 16%
High level cloud: 12%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

5 / 6 mph 62 / 59°F 76% 1018 mb
Low level cloud: 31%
Mid level cloud: 14%
High level cloud: 15%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

7 / 8 mph 66 / 63°F 69% 1017 mb
Low level cloud: 61%
Mid level cloud: 20%
High level cloud: 15%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

9 / 12 mph 65 / 63°F 75% 1016 mb
Low level cloud: 67%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

8 / 12 mph 62 / 59°F 88% 1015 mb
Low level cloud: 25%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
45%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SE
SE

7 / 14 mph 54 / 50°F 95% 1015 mb
Low level cloud: 21%
Mid level cloud: 10%
High level cloud: 97%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
May
00:00

SSE
SSE

6 / 12 mph 52 / 50°F 92% 1014 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 46%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

7 / 12 mph 51 / 48°F 93% 1012 mb
Low level cloud: 55%
Mid level cloud: 74%
High level cloud: 17%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

9 / 13 mph 52 / 48°F 97% 1012 mb
Low level cloud: 82%
Mid level cloud: 56%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SSW
SSW

12 / 15 mph 60 / 59°F 85% 1011 mb
Low level cloud: 78%
Mid level cloud: 15%
High level cloud: 15%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

14 / 21 mph 63 / 63°F 78% 1011 mb
Low level cloud: 85%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: low
88%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

SSW
SSW

14 / 20 mph 64 / 63°F 77% 1011 mb
Low level cloud: 50%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SSW
SSW

11 / 17 mph 62 / 60°F 86% 1011 mb
Low level cloud: 4%
Mid level cloud: 30%
High level cloud: 8%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

8 / 16 mph 53 / 49°F 95% 1012 mb
Low level cloud: 6%
Mid level cloud: 26%
High level cloud: 7%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May
00:00

SW
SW

8 / 15 mph 48 / 45°F 96% 1013 mb
Low level cloud: 25%
Mid level cloud: 7%
High level cloud: 18%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

7 / 14 mph 45 / 42°F 97% 1014 mb
Low level cloud: 20%
Mid level cloud: 11%
High level cloud: 12%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

7 / 10 mph 50 / 46°F 92% 1015 mb
Low level cloud: 15%
Mid level cloud: 24%
High level cloud: 62%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

9 / 11 mph 58 / 55°F 73% 1015 mb
Low level cloud: 41%
Mid level cloud: 20%
High level cloud: 10%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

10 / 12 mph 63 / 61°F 61% 1015 mb
Low level cloud: 47%
Mid level cloud: 14%
High level cloud: 17%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

8 / 11 mph 64 / 61°F 68% 1014 mb
Low level cloud: 8%
Mid level cloud: 32%
High level cloud: 74%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

7 / 10 mph 62 / 59°F 82% 1015 mb
Low level cloud: 2%
Mid level cloud: 12%
High level cloud: 10%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

6 / 13 mph 52 / 48°F 90% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 2%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May
00:00

SSW
SSW

6 / 12 mph 49 / 46°F 93% 1015 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

6 / 13 mph 47 / 43°F 95% 1015 mb
Low level cloud: 7%
Mid level cloud: 11%
High level cloud: 21%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

7 / 11 mph 52 / 47°F 93% 1014 mb
Low level cloud: 14%
Mid level cloud: 31%
High level cloud: 99%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

10 / 11 mph 60 / 57°F 79% 1013 mb
Low level cloud: 40%
Mid level cloud: 45%
High level cloud: 46%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

12 / 16 mph 61 / 60°F 81% 1012 mb
Low level cloud: 43%
Mid level cloud: 83%
High level cloud: 100%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

10 / 15 mph 54 / 51°F 95% 1010 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

10 / 14 mph 54 / 51°F 97% 1009 mb
Low level cloud: 98%
Mid level cloud: 52%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

7 / 11 mph 56 / 53°F 98% 1008 mb
Low level cloud: 74%
Mid level cloud: 29%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 29
May
00:00

SSW
SSW

7 / 12 mph 54 / 52°F 97% 1007 mb
Low level cloud: 52%
Mid level cloud: 46%
High level cloud: 61%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

7 / 14 mph 50 / 47°F 97% 1006 mb
Low level cloud: 43%
Mid level cloud: 12%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

7 / 11 mph 53 / 50°F 97% 1006 mb
Low level cloud: 68%
Mid level cloud: 79%
High level cloud: 10%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

9 / 12 mph 57 / 55°F 90% 1007 mb
Low level cloud: 79%
Mid level cloud: 74%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

8 / 10 mph 63 / 60°F 82% 1008 mb
Low level cloud: 48%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

9 / 13 mph 65 / 64°F 78% 1007 mb
Low level cloud: 39%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

9 / 13 mph 64 / 62°F 82% 1008 mb
Low level cloud: 16%
Mid level cloud: 32%
High level cloud: 19%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

7 / 14 mph 55 / 51°F 92% 1009 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 30
May
00:00

SSW
SSW

12 / 24 mph 54 / 51°F 87% 1011 mb
Low level cloud: 3%
Mid level cloud: 78%
High level cloud: 42%
Most Significant Cloud Type: medium
88%
0.0 In
06:00

S
S

5 / 11 mph 55 / 54°F 94% 1010 mb
Low level cloud: 74%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
12:00

WNW
WNW

8 / 17 mph 63 / 63°F 62% 1011 mb
Low level cloud: 75%
Mid level cloud: 13%
High level cloud: 5%
Most Significant Cloud Type: low
80%
0.0 In
18:00

SSE
SSE

9 / 17 mph 65 / 65°F 90% 1008 mb
Low level cloud: 22%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Fri 31
May
00:00

S
S

9 / 18 mph 53 / 50°F 95% 1008 mb
Low level cloud: 3%
Mid level cloud: 14%
High level cloud: 83%
Most Significant Cloud Type: medium
25%
0.0 In
06:00

SW
SW

9 / 19 mph 51 / 47°F 93% 1003 mb
Low level cloud: 10%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
10%
0.0 In
12:00

W
W

15 / 32 mph 63 / 63°F 65% 1007 mb
Low level cloud: 64%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: low
70%
0.0 In
18:00

NNE
NNE

14 / 29 mph 60 / 60°F 91% 1016 mb
Low level cloud: 77%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
92%
0.0 In
Sat 01
Jun
00:00

WNW
WNW

11 / 23 mph 50 / 45°F 94% 1007 mb
Low level cloud: 87%
Mid level cloud: 25%
High level cloud: 30%
Most Significant Cloud Type: low
99%
0.0 In
06:00

NNW
NNW

12 / 25 mph 51 / 46°F 87% 1021 mb
Low level cloud: 69%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
73%
0.0 In
12:00

W
W

18 / 38 mph 58 / 54°F 58% 1008 mb
Low level cloud: 18%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

N
N

6 / 14 mph 57 / 56°F 77% 1022 mb
Low level cloud: 6%
Mid level cloud: 3%
High level cloud: 83%
Most Significant Cloud Type: medium
22%
0.0 In
Sun 02
Jun
00:00

W
W

9 / 18 mph 43 / 38°F 97% 1008 mb
Low level cloud: 89%
Mid level cloud: 8%
High level cloud: 10%
Most Significant Cloud Type: low
93%
0.0 In
06:00

N
N

4 / 9 mph 50 / 49°F 85% 1023 mb
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: medium
47%
0.0 In
12:00

NW
NW

7 / 14 mph 58 / 57°F 65% 1013 mb
Low level cloud: 52%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: low
70%
0.1 In
18:00

WSW
WSW

4 / 8 mph 62 / 62°F 79% 1023 mb
Low level cloud: 32%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
Mon 03
Jun
00:00

WSW
WSW

7 / 14 mph 44 / 40°F 91% 1014 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: medium
10%
0.0 In
06:00

WSW
WSW

9 / 19 mph 51 / 47°F 92% 1021 mb
Low level cloud: 51%
Mid level cloud: 81%
High level cloud: 22%
Most Significant Cloud Type: low
82%
0.0 In
12:00

SW
SW

11 / 24 mph 57 / 54°F 76% 1010 mb
Low level cloud: 83%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.1 In
18:00

WNW
WNW

8 / 17 mph 59 / 59°F 86% 1020 mb
Low level cloud: 82%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: low
97%
0.0 In
Tue 04
Jun
00:00

SW
SW

9 / 18 mph 45 / 41°F 97% 1007 mb
Low level cloud: 30%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.2 In
06:00

WSW
WSW

11 / 22 mph 53 / 50°F 88% 1020 mb
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
12:00

WSW
WSW

15 / 32 mph 55 / 51°F 69% 1009 mb
Low level cloud: 66%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
67%
0.0 In
18:00

WSW
WSW

8 / 17 mph 68 / 67°F 80% 1016 mb
Low level cloud: 33%
Mid level cloud: 12%
High level cloud: 4%
Most Significant Cloud Type: low
37%
0.0 In
Wed 05
Jun
00:00

WSW
WSW

9 / 18 mph 44 / 39°F 96% 1012 mb
Low level cloud: 66%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.1 In
06:00

W
W

8 / 16 mph 55 / 53°F 90% 1015 mb
Low level cloud: 14%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
15%
0.0 In
12:00

W
W

11 / 23 mph 58 / 56°F 66% 1015 mb
Low level cloud: 83%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In
18:00

ENE
ENE

9 / 20 mph 58 / 56°F 87% 1014 mb
Low level cloud: 27%
Mid level cloud: 16%
High level cloud: 9%
Most Significant Cloud Type: low
33%
0.0 In
Thu 06
Jun
00:00

WSW
WSW

4 / 8 mph 49 / 48°F 86% 1017 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 18%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

NNW
NNW

11 / 22 mph 48 / 44°F 97% 1010 mb
Low level cloud: 99%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
12:00

W
W

10 / 21 mph 56 / 53°F 76% 1016 mb
Low level cloud: 39%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
66%
0.0 In
18:00

WNW
WNW

11 / 23 mph 55 / 51°F 79% 1009 mb
Low level cloud: 13%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.3 In
Fri 07
Jun
00:00

WSW
WSW

8 / 16 mph 42 / 37°F 91% 1016 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 32%
Most Significant Cloud Type: medium
30%
0.0 In
06:00

W
W

12 / 26 mph 47 / 41°F 83% 1010 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
12:00

W
W

15 / 30 mph 56 / 52°F 77% 1015 mb
Low level cloud: 76%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.0 In
18:00

NNW
NNW

8 / 16 mph 52 / 50°F 77% 1012 mb
Low level cloud: 1%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.1 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