WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Dieppe 14 Day Long Range Forecast

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

France

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

The forecast for Dieppe in the coming two weeks is predicting the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 18°C expected on the afternoon of Thursday 9th. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Thursday 9th at 6°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. The indicators are that Thursday 2nd 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
Wed 01
May
19:00

NW
NW

13 / 16 mph 57 / 54°F 95% 1003 mb
Low level cloud: 97%
Mid level cloud: 44%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

10 / 14 mph 55 / 53°F 96% 1002 mb
Low level cloud: 62%
Mid level cloud: 43%
High level cloud: 94%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 02
May
01:00

ESE
ESE

2 / 3 mph 52 / 53°F 98% 1001 mb
Low level cloud: 95%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

WSW
WSW

6 / 11 mph 51 / 48°F 98% 999 mb
Low level cloud: 88%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

SW
SW

19 / 30 mph 51 / 44°F 97% 1000 mb
Low level cloud: 93%
Mid level cloud: 10%
High level cloud: 61%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

23 / 26 mph 53 / 47°F 91% 1002 mb
Low level cloud: 97%
Mid level cloud: 12%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

25 / 29 mph 55 / 49°F 87% 1004 mb
Low level cloud: 85%
Mid level cloud: 17%
High level cloud: 31%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

24 / 28 mph 55 / 50°F 87% 1005 mb
Low level cloud: 88%
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
19:00

W
W

22 / 25 mph 54 / 48°F 89% 1007 mb
Low level cloud: 65%
Mid level cloud: 76%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

20 / 25 mph 52 / 47°F 86% 1009 mb
Low level cloud: 54%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 03
May
01:00

WSW
WSW

17 / 25 mph 50 / 44°F 88% 1010 mb
Low level cloud: 64%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

18 / 26 mph 49 / 42°F 92% 1010 mb
Low level cloud: 53%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

17 / 23 mph 49 / 43°F 91% 1011 mb
Low level cloud: 41%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

17 / 23 mph 52 / 46°F 79% 1012 mb
Low level cloud: 18%
Mid level cloud: 10%
High level cloud: 89%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

14 / 20 mph 55 / 50°F 71% 1012 mb
Low level cloud: 9%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

9 / 12 mph 56 / 52°F 72% 1012 mb
Low level cloud: 5%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: medium
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

3 / 4 mph 55 / 54°F 78% 1012 mb
Low level cloud: 38%
Mid level cloud: 25%
High level cloud: 2%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

5 / 8 mph 52 / 50°F 83% 1013 mb
Low level cloud: 14%
Mid level cloud: 31%
High level cloud: 3%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 04
May
01:00

SSE
SSE

9 / 19 mph 46 / 41°F 90% 1012 mb
Low level cloud: 2%
Mid level cloud: 14%
High level cloud: 31%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

9 / 18 mph 44 / 39°F 91% 1011 mb
Low level cloud: 6%
Mid level cloud: 47%
High level cloud: 32%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

7 / 12 mph 46 / 42°F 90% 1011 mb
Low level cloud: 15%
Mid level cloud: 66%
High level cloud: 17%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

7 / 8 mph 57 / 54°F 79% 1011 mb
Low level cloud: 45%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

2 / 3 mph 60 / 60°F 70% 1009 mb
Low level cloud: 26%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

3 / 4 mph 60 / 59°F 74% 1009 mb
Low level cloud: 32%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

4 / 5 mph 58 / 56°F 83% 1008 mb
Low level cloud: 10%
Mid level cloud: 28%
High level cloud: 5%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

0 / 1 mph 50 / 50°F 87% 1009 mb
Low level cloud: 3%
Mid level cloud: 7%
High level cloud: 12%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 05
May
01:00

SSW
SSW

4 / 7 mph 49 / 48°F 87% 1008 mb
Low level cloud: 3%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

4 / 7 mph 48 / 47°F 87% 1008 mb
Low level cloud: 1%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: medium
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

5 / 9 mph 48 / 46°F 85% 1007 mb
Low level cloud: 0%
Mid level cloud: 99%
High level cloud: 49%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

5 / 8 mph 53 / 50°F 77% 1007 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 67%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

7 / 9 mph 55 / 53°F 80% 1007 mb
Low level cloud: 1%
Mid level cloud: 99%
High level cloud: 66%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

14 / 17 mph 56 / 51°F 80% 1007 mb
Low level cloud: 1%
Mid level cloud: 56%
High level cloud: 18%
Most Significant Cloud Type: medium
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

15 / 20 mph 54 / 48°F 83% 1008 mb
Low level cloud: 0%
Mid level cloud: 56%
High level cloud: 32%
Most Significant Cloud Type: medium
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

15 / 21 mph 50 / 45°F 90% 1010 mb
Low level cloud: 15%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 06
May
01:00

SW
SW

12 / 17 mph 49 / 44°F 94% 1010 mb
Low level cloud: 64%
Mid level cloud: 22%
High level cloud: 4%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

13 / 22 mph 48 / 42°F 92% 1010 mb
Low level cloud: 72%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

12 / 21 mph 48 / 42°F 92% 1010 mb
Low level cloud: 94%
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
10:00

WSW
WSW

14 / 19 mph 52 / 47°F 89% 1010 mb
Low level cloud: 96%
Mid level cloud: 89%
High level cloud: 10%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

14 / 16 mph 55 / 51°F 88% 1011 mb
Low level cloud: 91%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

15 / 19 mph 56 / 51°F 89% 1010 mb
Low level cloud: 19%
Mid level cloud: 17%
High level cloud: 13%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

10 / 15 mph 54 / 50°F 92% 1011 mb
Low level cloud: 26%
Mid level cloud: 32%
High level cloud: 21%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

10 / 17 mph 50 / 47°F 96% 1013 mb
Low level cloud: 67%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 07
May
01:00

WSW
WSW

11 / 18 mph 51 / 47°F 95% 1013 mb
Low level cloud: 83%
Mid level cloud: 15%
High level cloud: 13%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

13 / 22 mph 50 / 45°F 96% 1014 mb
Low level cloud: 83%
Mid level cloud: 44%
High level cloud: 12%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

11 / 21 mph 50 / 46°F 94% 1015 mb
Low level cloud: 56%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

12 / 19 mph 53 / 48°F 91% 1016 mb
Low level cloud: 63%
Mid level cloud: 38%
High level cloud: 2%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

8 / 10 mph 55 / 52°F 86% 1018 mb
Low level cloud: 66%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

9 / 10 mph 56 / 52°F 83% 1018 mb
Low level cloud: 47%
Mid level cloud: 12%
High level cloud: 39%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

6 / 8 mph 55 / 51°F 84% 1019 mb
Low level cloud: 31%
Mid level cloud: 9%
High level cloud: 69%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

6 / 9 mph 52 / 50°F 88% 1020 mb
Low level cloud: 14%
Mid level cloud: 11%
High level cloud: 42%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 08
May
01:00

E
E

6 / 12 mph 52 / 50°F 88% 1024 mb
Low level cloud: 2%
Mid level cloud: 1%
High level cloud: 15%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

WNW
WNW

1 / 2 mph 55 / 55°F 94% 1015 mb
Low level cloud: 88%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
13:00

ENE
ENE

17 / 35 mph 55 / 51°F 64% 1025 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 34%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

NNW
NNW

17 / 36 mph 51 / 46°F 88% 1023 mb
Low level cloud: 96%
Mid level cloud: 29%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.0 In
Thu 09
May
01:00

SW
SW

3 / 6 mph 55 / 55°F 90% 1019 mb
Low level cloud: 9%
Mid level cloud: 76%
High level cloud: 91%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

WSW
WSW

6 / 12 mph 51 / 49°F 85% 1023 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 91%
Most Significant Cloud Type: medium
50%
0.0 In
13:00

NNE
NNE

13 / 25 mph 61 / 61°F 81% 1028 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: low
9%
0.0 In
19:00

NE
NE

17 / 35 mph 55 / 51°F 78% 1022 mb
Low level cloud: 34%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
45%
0.0 In
Fri 10
May
01:00

ESE
ESE

6 / 13 mph 49 / 47°F 86% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
12%
0.0 In
07:00

ENE
ENE

10 / 21 mph 44 / 39°F 85% 1022 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
13:00

ENE
ENE

8 / 16 mph 61 / 61°F 72% 1016 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
0.0 In
19:00

NE
NE

15 / 32 mph 55 / 51°F 79% 1017 mb
Low level cloud: 19%
Mid level cloud: 0%
High level cloud: 47%
Most Significant Cloud Type: low
24%
0.0 In
Sat 11
May
01:00

ENE
ENE

10 / 21 mph 52 / 49°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
0.0 In
07:00

E
E

9 / 19 mph 47 / 42°F 83% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
13:00

NE
NE

13 / 27 mph 58 / 55°F 77% 1017 mb
Low level cloud: 22%
Mid level cloud: 8%
High level cloud: 33%
Most Significant Cloud Type: low
28%
0.0 In
19:00

NNE
NNE

6 / 12 mph 58 / 58°F 82% 1012 mb
Low level cloud: 22%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: low
24%
0.0 In
Sun 12
May
01:00

ENE
ENE

10 / 21 mph 46 / 41°F 89% 1017 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 9%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

S
S

3 / 7 mph 56 / 56°F 84% 1011 mb
Low level cloud: 41%
Mid level cloud: 82%
High level cloud: 5%
Most Significant Cloud Type: low
70%
0.0 In
13:00

NE
NE

13 / 27 mph 60 / 60°F 71% 1016 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 18%
Most Significant Cloud Type: medium
7%
0.0 In
19:00

NNW
NNW

3 / 7 mph 61 / 61°F 86% 1011 mb
Low level cloud: 2%
Mid level cloud: 45%
High level cloud: 13%
Most Significant Cloud Type: medium
52%
0.0 In
Mon 13
May
01:00

ENE
ENE

11 / 21 mph 50 / 46°F 78% 1015 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: medium
76%
0.0 In
07:00

SE
SE

10 / 21 mph 55 / 53°F 97% 1005 mb
Low level cloud: 73%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
13:00

ENE
ENE

7 / 15 mph 51 / 49°F 91% 1012 mb
Low level cloud: 99%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
19:00

SW
SW

16 / 34 mph 59 / 59°F 89% 1001 mb
Low level cloud: 17%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: low
22%
0.4 In
Tue 14
May
01:00

ENE
ENE

9 / 19 mph 50 / 47°F 93% 1008 mb
Low level cloud: 80%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
97%
0.0 In
07:00

SSW
SSW

11 / 23 mph 49 / 45°F 90% 1002 mb
Low level cloud: 8%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
13:00

NNE
NNE

11 / 22 mph 55 / 52°F 87% 1008 mb
Low level cloud: 40%
Mid level cloud: 97%
High level cloud: 97%
Most Significant Cloud Type: low
85%
0.0 In
19:00

SSW
SSW

13 / 27 mph 55 / 52°F 85% 1001 mb
Low level cloud: 17%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: low
34%
0.2 In
Wed 15
May
01:00

NE
NE

19 / 40 mph 50 / 44°F 83% 1010 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SSW
SSW

22 / 45 mph 53 / 47°F 88% 1002 mb
Low level cloud: 67%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
83%
0.1 In
13:00

NE
NE

15 / 32 mph 53 / 49°F 79% 1009 mb
Low level cloud: 93%
Mid level cloud: 67%
High level cloud: 71%
Most Significant Cloud Type: low
100%
0.0 In
19:00

SSW
SSW

3 / 6 mph 58 / 59°F 88% 1004 mb
Low level cloud: 17%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: low
32%
0.1 In
Thu 16
May
01:00

NE
NE

20 / 42 mph 48 / 40°F 84% 1010 mb
Low level cloud: 94%
Mid level cloud: 45%
High level cloud: 43%
Most Significant Cloud Type: low
100%
0.0 In
07:00

S
S

11 / 22 mph 51 / 47°F 91% 1005 mb
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 13%
Most Significant Cloud Type: low
10%
0.0 In
13:00

N
N

21 / 44 mph 49 / 42°F 62% 1014 mb
Low level cloud: 18%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: low
22%
0.1 In
19:00

WSW
WSW

4 / 9 mph 58 / 57°F 88% 1002 mb
Low level cloud: 21%
Mid level cloud: 66%
High level cloud: 21%
Most Significant Cloud Type: medium
100%
0.0 In

Other Locations Near to Dieppe

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