WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Salla 14 Day Long Range Forecast

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

Finland

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

Over the next 14 days the Salla forecast suggests the average daytime maximum temperature will be around -5°C, with a high for the two weeks of 0°C expected on the afternoon of Friday 7th. The mean minimum temperature will be -15°C, dipping to its lowest on the morning of Saturday 15th at -23°C. The fortnight ahead will have mostly dry days although Wednesday is likely to see a little snow. Current predictions suggest Wednesday 5th will have the most precipitation with an accumulation of around 9.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 05
Feb
20:00

S
S

13 / 19 mph 24 / 13°F 95% 1014 mb
Low level cloud: 72%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
91%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
23:00

SSW
SSW

12 / 18 mph 27 / 16°F 95% 1015 mb
Low level cloud: 76%
Mid level cloud: 57%
High level cloud: 6%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 06
Feb
02:00

W
W

11 / 16 mph 31 / 22°F 95% 1019 mb
Low level cloud: 94%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WSW
WSW

8 / 15 mph 26 / 17°F 90% 1024 mb
Low level cloud: 4%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

WSW
WSW

5 / 11 mph 14 / 6°F 93% 1029 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

SSW
SSW

4 / 9 mph 12 / 4°F 94% 1033 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

SW
SW

8 / 15 mph 22 / 13°F 88% 1033 mb
Low level cloud: 4%
Mid level cloud: 2%
High level cloud: 11%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SSW
SSW

11 / 19 mph 25 / 14°F 87% 1033 mb
Low level cloud: 5%
Mid level cloud: 12%
High level cloud: 33%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SW
SW

14 / 23 mph 29 / 18°F 88% 1033 mb
Low level cloud: 35%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SW
SW

13 / 21 mph 30 / 20°F 91% 1034 mb
Low level cloud: 68%
Mid level cloud: 30%
High level cloud: 22%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 07
Feb
02:00

SW
SW

13 / 20 mph 30 / 20°F 91% 1034 mb
Low level cloud: 41%
Mid level cloud: 13%
High level cloud: 10%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SW
SW

11 / 17 mph 30 / 20°F 95% 1035 mb
Low level cloud: 91%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

SW
SW

10 / 15 mph 31 / 22°F 97% 1037 mb
Low level cloud: 94%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WSW
WSW

9 / 12 mph 31 / 24°F 98% 1039 mb
Low level cloud: 88%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

WSW
WSW

7 / 10 mph 32 / 25°F 96% 1041 mb
Low level cloud: 80%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SW
SW

5 / 10 mph 26 / 20°F 96% 1043 mb
Low level cloud: 60%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

S
S

4 / 9 mph 12 / 4°F 99% 1045 mb
Low level cloud: 58%
Mid level cloud: 6%
High level cloud: 18%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SSE
SSE

4 / 9 mph 12 / 4°F 99% 1046 mb
Low level cloud: 51%
Mid level cloud: 3%
High level cloud: 44%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 08
Feb
02:00

S
S

5 / 11 mph 13 / 4°F 99% 1046 mb
Low level cloud: 74%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

S
S

5 / 11 mph 15 / 6°F 99% 1046 mb
Low level cloud: 76%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

S
S

6 / 13 mph 17 / 8°F 97% 1045 mb
Low level cloud: 60%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

SW
SW

10 / 15 mph 25 / 15°F 94% 1045 mb
Low level cloud: 57%
Mid level cloud: 3%
High level cloud: 35%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

SW
SW

12 / 18 mph 27 / 17°F 90% 1044 mb
Low level cloud: 23%
Mid level cloud: 11%
High level cloud: 7%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SW
SW

14 / 20 mph 27 / 16°F 90% 1044 mb
Low level cloud: 54%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SW
SW

12 / 19 mph 23 / 11°F 91% 1043 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SW
SW

12 / 19 mph 22 / 10°F 90% 1041 mb
Low level cloud: 27%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 09
Feb
02:00

SW
SW

11 / 16 mph 21 / 10°F 92% 1040 mb
Low level cloud: 45%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SW
SW

12 / 20 mph 20 / 8°F 95% 1037 mb
Low level cloud: 100%
Mid level cloud: 78%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

SW
SW

13 / 24 mph 22 / 9°F 94% 1035 mb
Low level cloud: 100%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WSW
WSW

14 / 23 mph 25 / 13°F 91% 1034 mb
Low level cloud: 99%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

SW
SW

15 / 21 mph 27 / 15°F 89% 1032 mb
Low level cloud: 97%
Mid level cloud: 4%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WSW
WSW

15 / 19 mph 26 / 14°F 86% 1031 mb
Low level cloud: 37%
Mid level cloud: 18%
High level cloud: 3%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

WSW
WSW

12 / 16 mph 24 / 13°F 91% 1032 mb
Low level cloud: 37%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

W
W

14 / 23 mph 23 / 10°F 87% 1033 mb
Low level cloud: 10%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 10
Feb
02:00

WNW
WNW

16 / 26 mph 26 / 13°F 76% 1035 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WNW
WNW

14 / 22 mph 23 / 11°F 84% 1037 mb
Low level cloud: 24%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

WNW
WNW

10 / 17 mph 20 / 9°F 86% 1041 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

W
W

7 / 13 mph 18 / 9°F 87% 1043 mb
Low level cloud: 14%
Mid level cloud: 24%
High level cloud: 4%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

SW
SW

3 / 6 mph 18 / 14°F 91% 1043 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

WSW
WSW

9 / 16 mph 21 / 10°F 86% 1042 mb
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 100%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SW
SW

11 / 18 mph 20 / 9°F 88% 1040 mb
Low level cloud: 8%
Mid level cloud: 38%
High level cloud: 100%
Most Significant Cloud Type: medium
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WSW
WSW

10 / 17 mph 19 / 8°F 90% 1038 mb
Low level cloud: 21%
Mid level cloud: 26%
High level cloud: 32%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 11
Feb
02:00

WSW
WSW

8 / 14 mph 16 / 6°F 91% 1038 mb
Low level cloud: 18%
Mid level cloud: 6%
High level cloud: 10%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WSW
WSW

5 / 11 mph 11 / 2°F 93% 1038 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 16%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

SW
SW

4 / 8 mph 7 / -1°F 95% 1038 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 5%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

WSW
WSW

4 / 7 mph 15 / 10°F 93% 1039 mb
Low level cloud: 16%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

SW
SW

3 / 7 mph 21 / 16°F 95% 1039 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SW
SW

3 / 7 mph 11 / 6°F 96% 1040 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 17%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SW
SW

3 / 6 mph 8 / 3°F 95% 1040 mb
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 1%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

S
S

3 / 6 mph 7 / 1°F 95% 1039 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Wed 12
Feb
02:00

WSW
WSW

4 / 8 mph 19 / 14°F 97% 1042 mb
Low level cloud: 23%
Mid level cloud: 29%
High level cloud: 94%
Most Significant Cloud Type: low
44%
0.0 In
08:00

WSW
WSW

3 / 5 mph 22 / 18°F 94% 1045 mb
Low level cloud: 88%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: low
88%
0.0 In
14:00

W
W

10 / 16 mph 31 / 23°F 86% 1039 mb
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 7%
Most Significant Cloud Type: medium
46%
0.0 In
20:00

WNW
WNW

2 / 3 mph 18 / 16°F 97% 1044 mb
Low level cloud: 75%
Mid level cloud: 6%
High level cloud: 14%
Most Significant Cloud Type: low
79%
0.0 In
Thu 13
Feb
02:00

W
W

3 / 6 mph 11 / 6°F 98% 1041 mb
Low level cloud: 69%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
73%
0.0 In
08:00

NNW
NNW

2 / 4 mph -4 / -9°F 100% 1035 mb
Low level cloud: 55%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
14:00

W
W

2 / 4 mph 15 / 12°F 98% 1033 mb
Low level cloud: 51%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
20:00

WNW
WNW

2 / 4 mph -2 / -7°F 100% 1036 mb
Low level cloud: 42%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
Fri 14
Feb
02:00

NNW
NNW

2 / 5 mph 4 / -1°F 100% 1034 mb
Low level cloud: 76%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.0 In
08:00

W
W

2 / 3 mph -8 / -8°F 100% 1038 mb
Low level cloud: 54%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.0 In
14:00

NNW
NNW

4 / 6 mph 16 / 9°F 98% 1035 mb
Low level cloud: 95%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: low
97%
0.0 In
20:00

WNW
WNW

2 / 4 mph 4 / 0°F 98% 1036 mb
Low level cloud: 28%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Sat 15
Feb
02:00

N
N

3 / 6 mph -8 / -16°F 100% 1038 mb
Low level cloud: 21%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
08:00

NE
NE

2 / 4 mph -9 / -15°F 100% 1038 mb
Low level cloud: 72%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.0 In
14:00

NW
NW

3 / 6 mph 11 / 6°F 97% 1038 mb
Low level cloud: 35%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: low
56%
0.0 In
20:00

SSE
SSE

2 / 3 mph -8 / -8°F 100% 1041 mb
Low level cloud: 20%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.0 In
Sun 16
Feb
02:00

NW
NW

2 / 5 mph -10 / -17°F 100% 1039 mb
Low level cloud: 23%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
34%
0.0 In
08:00

WSW
WSW

2 / 4 mph -3 / -3°F 100% 1040 mb
Low level cloud: 100%
Mid level cloud: 45%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
14:00

NW
NW

3 / 6 mph 12 / 6°F 94% 1038 mb
Low level cloud: 27%
Mid level cloud: 62%
High level cloud: 2%
Most Significant Cloud Type: low
49%
0.0 In
20:00

NNW
NNW

3 / 7 mph -11 / -20°F 100% 1042 mb
Low level cloud: 22%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
Mon 17
Feb
02:00

WNW
WNW

2 / 4 mph -9 / -9°F 99% 1040 mb
Low level cloud: 19%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
08:00

E
E

0 / 0 mph -10 / -10°F 100% 1046 mb
Low level cloud: 94%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
14:00

WNW
WNW

2 / 4 mph 9 / 5°F 90% 1038 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 15%
Most Significant Cloud Type: medium
17%
0.0 In
20:00

W
W

1 / 3 mph -6 / -7°F 100% 1046 mb
Low level cloud: 98%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
Tue 18
Feb
02:00

WSW
WSW

2 / 4 mph -13 / -13°F 100% 1040 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
08:00

SW
SW

2 / 3 mph -13 / -13°F 100% 1043 mb
Low level cloud: 98%
Mid level cloud: 8%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
14:00

WNW
WNW

2 / 4 mph 5 / 1°F 88% 1038 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 8%
Most Significant Cloud Type: medium
41%
0.0 In
20:00

N
N

3 / 6 mph -10 / -18°F 100% 1043 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: medium
9%
0.0 In
Wed 19
Feb
02:00

SW
SW

3 / 6 mph -11 / -19°F 97% 1037 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 15%
Most Significant Cloud Type: medium
5%
0.0 In
08:00

SW
SW

1 / 2 mph -10 / -10°F 98% 1044 mb
Low level cloud: 2%
Mid level cloud: 27%
High level cloud: 20%
Most Significant Cloud Type: medium
32%
0.0 In
14:00

WSW
WSW

2 / 4 mph 7 / 2°F 85% 1034 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
0.0 In
20:00

WSW
WSW

2 / 3 mph 5 / 5°F 98% 1044 mb
Low level cloud: 97%
Mid level cloud: 12%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.0 In
Thu 20
Feb
02:00

SSW
SSW

2 / 4 mph -11 / -17°F 98% 1035 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: medium
3%
0.0 In
08:00

WSW
WSW

3 / 5 mph 13 / 8°F 97% 1045 mb
Low level cloud: 88%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
88%
0.0 In
14:00

WSW
WSW

1 / 1 mph 8 / 8°F 95% 1033 mb
Low level cloud: 48%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.0 In
20:00

SSW
SSW

4 / 8 mph -3 / -12°F 100% 1047 mb
Low level cloud: 100%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: low
100%
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