WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Kalix 14 Day Long Range Forecast

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

Sweden

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

The outlook for Kalix in the two weeks ahead shows the average daytime maximum temperature will be around 8°C, with a high for the two weeks of 10°C expected on the afternoon of Friday 16th. The average minimum temperature will be 2°C, dipping to its lowest on the morning of Sunday 11th at 1°C. Expect the next 14 days have mixed weather with some days dry and some seeing a little rain. It looks like Tuesday 13th will have the most precipitation with an accumulation of around 2.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 11
May
19:00

S
S

4 / 9 mph 40 / 37°F 73% 1022 mb
Low level cloud: 24%
Mid level cloud: 11%
High level cloud: 9%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

5 / 11 mph 38 / 34°F 77% 1022 mb
Low level cloud: 30%
Mid level cloud: 22%
High level cloud: 4%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 12
May
01:00

SSE
SSE

6 / 12 mph 34 / 29°F 80% 1022 mb
Low level cloud: 28%
Mid level cloud: 26%
High level cloud: 3%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

6 / 13 mph 36 / 30°F 79% 1021 mb
Low level cloud: 6%
Mid level cloud: 14%
High level cloud: 7%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

8 / 17 mph 41 / 35°F 69% 1020 mb
Low level cloud: 4%
Mid level cloud: 24%
High level cloud: 16%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

9 / 18 mph 42 / 36°F 66% 1020 mb
Low level cloud: 3%
Mid level cloud: 29%
High level cloud: 17%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

10 / 18 mph 44 / 38°F 60% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 3%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

8 / 16 mph 42 / 37°F 61% 1018 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 100%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

10 / 21 mph 39 / 33°F 65% 1016 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 5%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

6 / 13 mph 37 / 32°F 73% 1015 mb
Low level cloud: 21%
Mid level cloud: 64%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 13
May
01:00

SE
SE

6 / 13 mph 35 / 30°F 93% 1014 mb
Low level cloud: 33%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

E
E

2 / 4 mph 36 / 35°F 92% 1013 mb
Low level cloud: 0%
Mid level cloud: 65%
High level cloud: 21%
Most Significant Cloud Type: medium
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

2 / 4 mph 42 / 41°F 82% 1012 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

6 / 11 mph 46 / 42°F 67% 1011 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

9 / 20 mph 44 / 38°F 72% 1008 mb
Low level cloud: 35%
Mid level cloud: 56%
High level cloud: 22%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

7 / 15 mph 44 / 40°F 76% 1005 mb
Low level cloud: 9%
Mid level cloud: 43%
High level cloud: 12%
Most Significant Cloud Type: medium
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

7 / 15 mph 43 / 38°F 69% 1003 mb
Low level cloud: 1%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

11 / 24 mph 39 / 32°F 59% 1003 mb
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 14
May
01:00

WNW
WNW

10 / 21 mph 36 / 29°F 68% 1003 mb
Low level cloud: 0%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

10 / 15 mph 35 / 28°F 89% 1002 mb
Low level cloud: 88%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

6 / 11 mph 37 / 32°F 86% 1002 mb
Low level cloud: 88%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

7 / 12 mph 38 / 32°F 94% 1005 mb
Low level cloud: 90%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

9 / 17 mph 42 / 36°F 87% 1008 mb
Low level cloud: 76%
Mid level cloud: 42%
High level cloud: 15%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

10 / 21 mph 48 / 43°F 64% 1010 mb
Low level cloud: 46%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

9 / 20 mph 46 / 41°F 70% 1012 mb
Low level cloud: 18%
Mid level cloud: 29%
High level cloud: 9%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

12 / 24 mph 42 / 35°F 85% 1014 mb
Low level cloud: 2%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 15
May
01:00

N
N

10 / 19 mph 38 / 31°F 90% 1015 mb
Low level cloud: 9%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

8 / 14 mph 38 / 31°F 88% 1015 mb
Low level cloud: 6%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

8 / 13 mph 42 / 37°F 71% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

6 / 11 mph 47 / 43°F 54% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 16%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

4 / 9 mph 49 / 46°F 49% 1015 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 11%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

5 / 11 mph 48 / 45°F 54% 1015 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 54%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

7 / 15 mph 44 / 39°F 67% 1015 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 9%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

8 / 16 mph 39 / 33°F 75% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 16
May
01:00

SW
SW

7 / 16 mph 37 / 31°F 84% 1014 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

7 / 15 mph 39 / 33°F 83% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

9 / 17 mph 46 / 40°F 60% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

5 / 11 mph 49 / 46°F 53% 1014 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

6 / 13 mph 50 / 47°F 51% 1014 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

8 / 18 mph 49 / 45°F 53% 1015 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 11%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

4 / 8 mph 45 / 42°F 67% 1015 mb
Low level cloud: 0%
Mid level cloud: 54%
High level cloud: 3%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

11 / 24 mph 44 / 38°F 65% 1017 mb
Low level cloud: 21%
Mid level cloud: 36%
High level cloud: 7%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 17
May
01:00

NNE
NNE

9 / 18 mph 39 / 34°F 72% 1019 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 9%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

11 / 19 mph 38 / 30°F 63% 1021 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 17%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

10 / 15 mph 41 / 35°F 49% 1022 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 12%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

5 / 9 mph 43 / 39°F 45% 1022 mb
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 1%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

2 / 4 mph 44 / 43°F 45% 1022 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

6 / 12 mph 44 / 40°F 46% 1021 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

6 / 13 mph 41 / 36°F 57% 1020 mb
Low level cloud: 0%
Mid level cloud: 37%
High level cloud: 0%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

5 / 11 mph 37 / 33°F 66% 1021 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 18
May
01:00

ESE
ESE

5 / 11 mph 40 / 36°F 80% 1022 mb
Low level cloud: 18%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

SSW
SSW

5 / 10 mph 49 / 47°F 64% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
7%
0.0 In
13:00

WSW
WSW

3 / 6 mph 47 / 46°F 67% 1024 mb
Low level cloud: 68%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: low
99%
0.0 In
19:00

NNE
NNE

12 / 22 mph 44 / 38°F 83% 1022 mb
Low level cloud: 2%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
49%
0.0 In
Mon 19
May
01:00

NNW
NNW

8 / 17 mph 34 / 28°F 62% 1020 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 11%
Most Significant Cloud Type: medium
26%
0.0 In
07:00

S
S

5 / 7 mph 42 / 38°F 71% 1024 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 20%
Most Significant Cloud Type: medium
10%
0.0 In
13:00

SSW
SSW

11 / 23 mph 50 / 46°F 60% 1018 mb
Low level cloud: 0%
Mid level cloud: 82%
High level cloud: 16%
Most Significant Cloud Type: medium
82%
0.0 In
19:00

WNW
WNW

13 / 19 mph 49 / 44°F 44% 997 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
Tue 20
May
01:00

WNW
WNW

7 / 15 mph 44 / 40°F 78% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

WNW
WNW

9 / 16 mph 41 / 35°F 55% 989 mb
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
48%
0.0 In
13:00

SW
SW

9 / 18 mph 53 / 51°F 53% 1016 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 79%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

NW
NW

10 / 20 mph 44 / 38°F 54% 990 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.0 In
Wed 21
May
01:00

W
W

10 / 21 mph 49 / 45°F 63% 1012 mb
Low level cloud: 0%
Mid level cloud: 92%
High level cloud: 20%
Most Significant Cloud Type: medium
92%
0.0 In
07:00

NW
NW

8 / 17 mph 37 / 31°F 58% 994 mb
Low level cloud: 16%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
24%
0.0 In
13:00

WSW
WSW

7 / 15 mph 55 / 53°F 51% 1011 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 2%
Most Significant Cloud Type: medium
14%
0.0 In
19:00

SW
SW

9 / 18 mph 42 / 37°F 64% 996 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.0 In
Thu 22
May
01:00

WNW
WNW

6 / 13 mph 44 / 41°F 75% 1013 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 20%
Most Significant Cloud Type: medium
14%
0.0 In
07:00

NNW
NNW

9 / 18 mph 37 / 31°F 62% 1004 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.0 In
13:00

SSW
SSW

9 / 18 mph 50 / 47°F 71% 1013 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
0.0 In
19:00

NE
NE

4 / 9 mph 42 / 40°F 59% 1010 mb
Low level cloud: 31%
Mid level cloud: 45%
High level cloud: 15%
Most Significant Cloud Type: low
48%
0.0 In
Fri 23
May
01:00

SSE
SSE

4 / 7 mph 40 / 38°F 86% 1012 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 25%
Most Significant Cloud Type: medium
18%
0.0 In
07:00

E
E

7 / 13 mph 39 / 34°F 70% 1014 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 35%
Most Significant Cloud Type: medium
22%
0.0 In
13:00

SE
SE

8 / 13 mph 46 / 42°F 75% 1012 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
19:00

ENE
ENE

10 / 18 mph 42 / 36°F 95% 1006 mb
Low level cloud: 100%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Sat 24
May
01:00

SSE
SSE

9 / 18 mph 37 / 31°F 87% 1009 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
0.0 In
07:00

SW
SW

4 / 8 mph 38 / 35°F 97% 1007 mb
Low level cloud: 85%
Mid level cloud: 70%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

SSW
SSW

15 / 32 mph 40 / 32°F 97% 1003 mb
Low level cloud: 88%
Mid level cloud: 4%
High level cloud: 16%
Most Significant Cloud Type: low
91%
0.1 In
19:00

SSE
SSE

5 / 8 mph 42 / 39°F 95% 1011 mb
Low level cloud: 70%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
Sun 25
May
01:00

S
S

11 / 23 mph 40 / 33°F 99% 1000 mb
Low level cloud: 95%
Mid level cloud: 17%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
07:00

ENE
ENE

4 / 7 mph 39 / 37°F 91% 1011 mb
Low level cloud: 57%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: low
75%
0.0 In
13:00

S
S

15 / 32 mph 48 / 42°F 70% 1001 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: medium
44%
0.0 In
19:00

NNE
NNE

8 / 16 mph 47 / 43°F 95% 1002 mb
Low level cloud: 87%
Mid level cloud: 96%
High level cloud: 37%
Most Significant Cloud Type: low
100%
0.1 In
Mon 26
May
01:00

SSW
SSW

13 / 22 mph 40 / 32°F 99% 1000 mb
Low level cloud: 91%
Mid level cloud: 68%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.4 In
07:00

SW
SW

6 / 12 mph 38 / 33°F 95% 995 mb
Low level cloud: 100%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

S
S

12 / 26 mph 44 / 38°F 90% 1007 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

W
W

12 / 21 mph 42 / 36°F 84% 1000 mb
Low level cloud: 30%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In

Other Locations Near to Kalix

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