WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Les Gets 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Les Gets

France

Long range weather outlook for Les Gets includes 14 day forecast summary:

Over the next 14 days the Les Gets forecast suggests the average daytime maximum temperature will be around 1°C, with a high for the two weeks of 6°C expected on the afternoon of Thursday 20th. The average minimum temperature will be -2°C, dipping to its lowest on the morning of Friday 14th at -6°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain, sleet or snow. Predictions are Thursday 13th will have the most precipitation with an accumulation of around 13.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 12
Mar
19:00

ENE
ENE

1 / 1 mph 38 / 38°F 93% 997 mb
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 70%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

1 / 2 mph 36 / 36°F 93% 997 mb
Low level cloud: 21%
Mid level cloud: 42%
High level cloud: 97%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 13
Mar
01:00

SSE
SSE

4 / 7 mph 34 / 30°F 93% 997 mb
Low level cloud: 25%
Mid level cloud: 46%
High level cloud: 16%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

4 / 7 mph 32 / 28°F 97% 995 mb
Low level cloud: 78%
Mid level cloud: 66%
High level cloud: 83%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

SW
SW

5 / 11 mph 26 / 20°F 98% 996 mb
Low level cloud: 88%
Mid level cloud: 61%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
10:00

WSW
WSW

6 / 13 mph 27 / 20°F 93% 998 mb
Low level cloud: 71%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

SW
SW

7 / 14 mph 30 / 24°F 82% 997 mb
Low level cloud: 8%
Mid level cloud: 58%
High level cloud: 0%
Most Significant Cloud Type: medium
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

5 / 10 mph 30 / 25°F 85% 998 mb
Low level cloud: 22%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

2 / 3 mph 26 / 26°F 95% 1000 mb
Low level cloud: 74%
Mid level cloud: 60%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

3 / 6 mph 25 / 21°F 99% 1003 mb
Low level cloud: 95%
Mid level cloud: 49%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Fri 14
Mar
01:00

N
N

4 / 7 mph 24 / 19°F 99% 1003 mb
Low level cloud: 90%
Mid level cloud: 49%
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

NNE
NNE

4 / 7 mph 22 / 18°F 97% 1002 mb
Low level cloud: 84%
Mid level cloud: 78%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

3 / 6 mph 22 / 19°F 98% 1003 mb
Low level cloud: 76%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

4 / 9 mph 24 / 19°F 91% 1002 mb
Low level cloud: 45%
Mid level cloud: 63%
High level cloud: 17%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

5 / 10 mph 27 / 21°F 94% 1003 mb
Low level cloud: 65%
Mid level cloud: 98%
High level cloud: 41%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

4 / 9 mph 27 / 22°F 96% 1004 mb
Low level cloud: 85%
Mid level cloud: 100%
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

NNE
NNE

4 / 8 mph 26 / 22°F 99% 1005 mb
Low level cloud: 92%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

N
N

2 / 4 mph 25 / 23°F 99% 1006 mb
Low level cloud: 94%
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
Sat 15
Mar
01:00

NNE
NNE

2 / 4 mph 25 / 23°F 99% 1006 mb
Low level cloud: 92%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

1 / 2 mph 24 / 24°F 99% 1006 mb
Low level cloud: 91%
Mid level cloud: 100%
High level cloud: 47%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

2 / 3 mph 24 / 24°F 99% 1007 mb
Low level cloud: 92%
Mid level cloud: 67%
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

NW
NW

2 / 5 mph 26 / 23°F 98% 1008 mb
Low level cloud: 82%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

3 / 6 mph 27 / 24°F 97% 1010 mb
Low level cloud: 84%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

3 / 6 mph 27 / 24°F 98% 1011 mb
Low level cloud: 90%
Mid level cloud: 100%
High level cloud: 31%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

2 / 4 mph 27 / 25°F 99% 1012 mb
Low level cloud: 97%
Mid level cloud: 97%
High level cloud: 27%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

2 / 4 mph 26 / 26°F 99% 1014 mb
Low level cloud: 96%
Mid level cloud: 87%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 16
Mar
01:00

NNW
NNW

2 / 3 mph 26 / 26°F 99% 1015 mb
Low level cloud: 95%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

1 / 3 mph 26 / 26°F 99% 1015 mb
Low level cloud: 93%
Mid level cloud: 67%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

1 / 3 mph 26 / 26°F 99% 1016 mb
Low level cloud: 92%
Mid level cloud: 100%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

3 / 6 mph 27 / 24°F 98% 1017 mb
Low level cloud: 87%
Mid level cloud: 73%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

3 / 7 mph 28 / 24°F 99% 1018 mb
Low level cloud: 94%
Mid level cloud: 61%
High level cloud: 91%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

3 / 7 mph 28 / 24°F 99% 1018 mb
Low level cloud: 95%
Mid level cloud: 91%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

2 / 5 mph 28 / 26°F 99% 1020 mb
Low level cloud: 92%
Mid level cloud: 79%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

3 / 6 mph 27 / 24°F 98% 1021 mb
Low level cloud: 86%
Mid level cloud: 45%
High level cloud: 7%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 17
Mar
01:00

NNW
NNW

2 / 3 mph 27 / 27°F 95% 1021 mb
Low level cloud: 55%
Mid level cloud: 60%
High level cloud: 15%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

2 / 5 mph 26 / 24°F 98% 1021 mb
Low level cloud: 78%
Mid level cloud: 58%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

2 / 5 mph 26 / 23°F 99% 1021 mb
Low level cloud: 91%
Mid level cloud: 65%
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

NW
NW

2 / 5 mph 27 / 25°F 97% 1021 mb
Low level cloud: 77%
Mid level cloud: 58%
High level cloud: 12%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

3 / 5 mph 28 / 26°F 96% 1021 mb
Low level cloud: 76%
Mid level cloud: 48%
High level cloud: 37%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

2 / 5 mph 29 / 27°F 91% 1020 mb
Low level cloud: 77%
Mid level cloud: 49%
High level cloud: 31%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

2 / 4 mph 29 / 28°F 96% 1021 mb
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 68%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

2 / 3 mph 32 / 32°F 96% 1022 mb
Low level cloud: 73%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 18
Mar
01:00

S
S

2 / 2 mph 32 / 32°F 96% 1021 mb
Low level cloud: 73%
Mid level cloud: 52%
High level cloud: 32%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

0 / 1 mph 27 / 27°F 96% 1020 mb
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

1 / 3 mph 26 / 26°F 93% 1020 mb
Low level cloud: 41%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

2 / 5 mph 29 / 27°F 87% 1019 mb
Low level cloud: 45%
Mid level cloud: 47%
High level cloud: 2%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

3 / 5 mph 31 / 29°F 87% 1018 mb
Low level cloud: 63%
Mid level cloud: 99%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

1 / 3 mph 31 / 31°F 85% 1017 mb
Low level cloud: 37%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

3 / 6 mph 31 / 28°F 94% 1019 mb
Low level cloud: 38%
Mid level cloud: 88%
High level cloud: 41%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

4 / 7 mph 33 / 30°F 91% 1020 mb
Low level cloud: 15%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 19
Mar
01:00

S
S

5 / 10 mph 40 / 36°F 85% 1011 mb
Low level cloud: 2%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

SE
SE

5 / 9 mph 29 / 24°F 88% 1012 mb
Low level cloud: 3%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
0.0 In
13:00

SE
SE

2 / 5 mph 38 / 37°F 74% 1015 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

SE
SE

5 / 9 mph 45 / 43°F 89% 1016 mb
Low level cloud: 5%
Mid level cloud: 25%
High level cloud: 13%
Most Significant Cloud Type: medium
39%
0.0 In
Thu 20
Mar
01:00

SE
SE

6 / 13 mph 34 / 28°F 80% 1026 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

SSE
SSE

4 / 10 mph 35 / 31°F 82% 1011 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 4%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

ESE
ESE

0 / 1 mph 34 / 34°F 81% 999 mb
Low level cloud: 1%
Mid level cloud: 94%
High level cloud: 90%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

SE
SE

6 / 11 mph 44 / 41°F 82% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 24%
Most Significant Cloud Type: medium
11%
0.0 In
Fri 21
Mar
01:00

ESE
ESE

5 / 11 mph 39 / 35°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 4%
Most Significant Cloud Type: medium
44%
0.0 In
07:00

S
S

4 / 8 mph 39 / 35°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

SW
SW

0 / 1 mph 38 / 38°F 69% 1014 mb
Low level cloud: 0%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: medium
84%
0.0 In
19:00

NE
NE

1 / 3 mph 42 / 42°F 92% 1016 mb
Low level cloud: 25%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Sat 22
Mar
01:00

SE
SE

4 / 7 mph 39 / 37°F 83% 1012 mb
Low level cloud: 0%
Mid level cloud: 84%
High level cloud: 18%
Most Significant Cloud Type: medium
85%
0.1 In
07:00

ESE
ESE

2 / 5 mph 39 / 38°F 87% 1011 mb
Low level cloud: 2%
Mid level cloud: 64%
High level cloud: 68%
Most Significant Cloud Type: medium
71%
0.0 In
13:00

WNW
WNW

3 / 7 mph 43 / 42°F 66% 1009 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 75%
Most Significant Cloud Type: medium
21%
0.0 In
19:00

SE
SE

1 / 3 mph 46 / 46°F 87% 1007 mb
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
50%
0.0 In
Sun 23
Mar
01:00

NE
NE

2 / 4 mph 41 / 41°F 92% 1011 mb
Low level cloud: 30%
Mid level cloud: 59%
High level cloud: 32%
Most Significant Cloud Type: low
54%
0.0 In
07:00

SE
SE

4 / 9 mph 39 / 36°F 79% 1011 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 33%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

NNW
NNW

4 / 9 mph 42 / 40°F 71% 1010 mb
Low level cloud: 1%
Mid level cloud: 88%
High level cloud: 100%
Most Significant Cloud Type: medium
95%
0.0 In
19:00

SE
SE

4 / 9 mph 47 / 45°F 78% 1011 mb
Low level cloud: 0%
Mid level cloud: 69%
High level cloud: 100%
Most Significant Cloud Type: medium
73%
0.0 In
Mon 24
Mar
01:00

NNE
NNE

1 / 2 mph 37 / 37°F 95% 1015 mb
Low level cloud: 55%
Mid level cloud: 46%
High level cloud: 73%
Most Significant Cloud Type: low
79%
0.0 In
07:00

SE
SE

4 / 7 mph 42 / 40°F 79% 1015 mb
Low level cloud: 0%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: medium
99%
0.0 In
13:00

NW
NW

4 / 8 mph 45 / 43°F 64% 1011 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
19:00

E
E

1 / 2 mph 47 / 47°F 86% 1013 mb
Low level cloud: 8%
Mid level cloud: 44%
High level cloud: 84%
Most Significant Cloud Type: medium
71%
0.0 In
Tue 25
Mar
01:00

N
N

2 / 3 mph 38 / 38°F 95% 1011 mb
Low level cloud: 70%
Mid level cloud: 80%
High level cloud: 82%
Most Significant Cloud Type: low
100%
0.0 In
07:00

E
E

4 / 7 mph 44 / 43°F 86% 1013 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 99%
Most Significant Cloud Type: medium
13%
0.0 In
13:00

NW
NW

6 / 12 mph 31 / 25°F 99% 1013 mb
Low level cloud: 95%
Mid level cloud: 97%
High level cloud: 5%
Most Significant Cloud Type: low
100%
0.3 In
19:00

S
S

3 / 6 mph 49 / 48°F 89% 1009 mb
Low level cloud: 4%
Mid level cloud: 17%
High level cloud: 31%
Most Significant Cloud Type: medium
29%
0.0 In
Wed 26
Mar
01:00

N
N

5 / 10 mph 26 / 20°F 99% 1015 mb
Low level cloud: 93%
Mid level cloud: 96%
High level cloud: 58%
Most Significant Cloud Type: low
100%
0.4 In
07:00

SSW
SSW

4 / 8 mph 36 / 33°F 87% 1010 mb
Low level cloud: 28%
Mid level cloud: 95%
High level cloud: 9%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

NW
NW

3 / 7 mph 29 / 26°F 88% 1010 mb
Low level cloud: 56%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: low
94%
0.2 In
19:00

SE
SE

2 / 3 mph 45 / 45°F 90% 1009 mb
Low level cloud: 18%
Mid level cloud: 43%
High level cloud: 79%
Most Significant Cloud Type: low
42%
0.1 In
Thu 27
Mar
01:00

WSW
WSW

4 / 7 mph 24 / 20°F 99% 1007 mb
Low level cloud: 88%
Mid level cloud: 59%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
07:00

ESE
ESE

4 / 8 mph 40 / 38°F 88% 1010 mb
Low level cloud: 4%
Mid level cloud: 11%
High level cloud: 76%
Most Significant Cloud Type: medium
23%
0.0 In
13:00

W
W

5 / 10 mph 27 / 21°F 88% 1006 mb
Low level cloud: 29%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
67%
0.3 In
19:00

ESE
ESE

3 / 6 mph 50 / 50°F 83% 1008 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 18%
Most Significant Cloud Type: medium
17%
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