WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Tjan-San (mtn Stn) 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Tjan-San (mtn Stn)

Russia

Long range weather outlook for Tjan-San (mtn Stn) includes 14 day forecast summary:

The forecast for Tjan-San (mtn Stn) in the coming two weeks is predicting the average daytime maximum temperature will be around 8°C, with a high for the two weeks of 12°C expected on the afternoon of Friday 24th. The average minimum temperature will be -2°C, dipping to its lowest on the morning of Monday 27th at -6°C. The coming 14 days will have some days seeing a little precipitation and some days with rain, sleet or snow. The indicators are that Sunday 19th will have the most precipitation with an accumulation of around 10.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 19
May
22:00

ESE
ESE

4 / 9 mph 28 / 23°F 89% 1022 mb
Low level cloud: 11%
Mid level cloud: 45%
High level cloud: 41%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
01:00

SE
SE

4 / 9 mph 25 / 20°F 89% 1022 mb
Low level cloud: 12%
Mid level cloud: 86%
High level cloud: 94%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

5 / 10 mph 25 / 19°F 97% 1020 mb
Low level cloud: 66%
Mid level cloud: 44%
High level cloud: 72%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

6 / 7 mph 34 / 28°F 98% 1019 mb
Low level cloud: 83%
Mid level cloud: 60%
High level cloud: 44%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

SSE
SSE

7 / 8 mph 40 / 35°F 100% 1017 mb
Low level cloud: 94%
Mid level cloud: 83%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

6 / 7 mph 42 / 38°F 99% 1016 mb
Low level cloud: 92%
Mid level cloud: 77%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

6 / 7 mph 42 / 38°F 98% 1016 mb
Low level cloud: 75%
Mid level cloud: 50%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

6 / 7 mph 40 / 36°F 96% 1017 mb
Low level cloud: 61%
Mid level cloud: 43%
High level cloud: 12%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

3 / 3 mph 36 / 35°F 91% 1019 mb
Low level cloud: 29%
Mid level cloud: 50%
High level cloud: 5%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
01:00

S
S

0 / 0 mph 34 / 34°F 97% 1022 mb
Low level cloud: 70%
Mid level cloud: 46%
High level cloud: 94%
Most Significant Cloud Type: low
97%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
04:00

SSW
SSW

5 / 6 mph 31 / 26°F 96% 1022 mb
Low level cloud: 60%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

6 / 8 mph 30 / 24°F 94% 1022 mb
Low level cloud: 45%
Mid level cloud: 46%
High level cloud: 99%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

5 / 6 mph 36 / 30°F 91% 1021 mb
Low level cloud: 7%
Mid level cloud: 24%
High level cloud: 33%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

5 / 6 mph 38 / 34°F 86% 1020 mb
Low level cloud: 0%
Mid level cloud: 18%
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

NW
NW

2 / 4 mph 40 / 38°F 75% 1019 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

2 / 4 mph 37 / 35°F 55% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

2 / 4 mph 28 / 28°F 42% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 2%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
01:00

SE
SE

5 / 10 mph 29 / 24°F 47% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 75%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

4 / 9 mph 30 / 25°F 59% 1021 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

8 / 16 mph 27 / 19°F 90% 1023 mb
Low level cloud: 21%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
43%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

SSE
SSE

7 / 8 mph 38 / 31°F 91% 1022 mb
Low level cloud: 16%
Mid level cloud: 29%
High level cloud: 16%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

4 / 6 mph 44 / 40°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 89%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

2 / 2 mph 44 / 44°F 83% 1018 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 34%
Most Significant Cloud Type: medium
18%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SSE
SSE

2 / 3 mph 40 / 38°F 91% 1020 mb
Low level cloud: 17%
Mid level cloud: 31%
High level cloud: 79%
Most Significant Cloud Type: low
37%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

S
S

5 / 11 mph 29 / 23°F 88% 1022 mb
Low level cloud: 5%
Mid level cloud: 23%
High level cloud: 15%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May
01:00

SSW
SSW

6 / 12 mph 27 / 20°F 86% 1022 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 2%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

6 / 12 mph 26 / 20°F 81% 1021 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

5 / 11 mph 29 / 23°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

5 / 5 mph 43 / 40°F 73% 1018 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 76%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

6 / 7 mph 48 / 44°F 55% 1016 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 14%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

9 / 12 mph 51 / 46°F 49% 1013 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 7%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

7 / 10 mph 46 / 42°F 55% 1014 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 16%
Most Significant Cloud Type: medium
9%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

NW
NW

5 / 11 mph 31 / 26°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 19%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May
01:00

SSW
SSW

3 / 7 mph 29 / 26°F 71% 1019 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 10%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

5 / 11 mph 28 / 22°F 73% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

6 / 12 mph 27 / 21°F 67% 1020 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
10:00

SSW
SSW

7 / 8 mph 45 / 40°F 53% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 21%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

9 / 10 mph 51 / 46°F 43% 1015 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 33%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

10 / 12 mph 54 / 49°F 40% 1012 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 32%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

2 / 3 mph 49 / 48°F 57% 1014 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 68%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

5 / 11 mph 32 / 27°F 79% 1018 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sat 25
May
01:00

SW
SW

5 / 9 mph 33 / 29°F 78% 1018 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

6 / 12 mph 31 / 26°F 73% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 33%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

3 / 5 mph 33 / 29°F 86% 1019 mb
Low level cloud: 3%
Mid level cloud: 35%
High level cloud: 91%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

6 / 6 mph 43 / 38°F 78% 1018 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

10 / 12 mph 50 / 45°F 50% 1015 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 89%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

12 / 16 mph 51 / 46°F 49% 1013 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 63%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

10 / 13 mph 46 / 40°F 74% 1015 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 14%
Most Significant Cloud Type: medium
27%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

NW
NW

6 / 8 mph 37 / 33°F 78% 1017 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 7%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 26
May
01:00

SSW
SSW

3 / 7 mph 39 / 37°F 69% 1017 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 24%
Most Significant Cloud Type: medium
30%
0.0 In
07:00

SW
SW

2 / 4 mph 33 / 32°F 82% 1020 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 8%
Most Significant Cloud Type: medium
19%
0.0 In
13:00

SW
SW

13 / 27 mph 54 / 51°F 39% 1013 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 1%
Most Significant Cloud Type: medium
20%
0.0 In
19:00

NW
NW

9 / 18 mph 54 / 52°F 45% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 3%
Most Significant Cloud Type: medium
10%
0.0 In
Mon 27
May
01:00

S
S

3 / 6 mph 30 / 28°F 64% 1022 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

S
S

2 / 5 mph 23 / 20°F 22% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NW
NW

3 / 7 mph 40 / 38°F 21% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

NNW
NNW

6 / 12 mph 39 / 35°F 35% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Tue 28
May
01:00

SSW
SSW

5 / 10 mph 28 / 22°F 62% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

S
S

5 / 10 mph 25 / 19°F 37% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NNW
NNW

5 / 11 mph 44 / 40°F 54% 1012 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: medium
33%
0.0 In
19:00

NNW
NNW

3 / 7 mph 42 / 41°F 49% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: medium
46%
0.0 In
Wed 29
May
01:00

NNW
NNW

5 / 10 mph 34 / 30°F 96% 1017 mb
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 48%
Most Significant Cloud Type: low
93%
0.2 In
07:00

SSW
SSW

6 / 13 mph 31 / 25°F 73% 1018 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 88%
Most Significant Cloud Type: medium
26%
0.0 In
13:00

W
W

6 / 12 mph 38 / 34°F 72% 1016 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.1 In
19:00

NNW
NNW

7 / 14 mph 39 / 34°F 66% 1016 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 15%
Most Significant Cloud Type: medium
8%
0.2 In
Thu 30
May
01:00

WNW
WNW

2 / 4 mph 29 / 28°F 77% 1020 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 95%
Most Significant Cloud Type: medium
28%
0.1 In
07:00

NW
NW

4 / 7 mph 28 / 24°F 90% 1020 mb
Low level cloud: 23%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
13:00

W
W

17 / 35 mph 44 / 37°F 33% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
19:00

NNW
NNW

13 / 26 mph 37 / 29°F 43% 1022 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Fri 31
May
01:00

SW
SW

2 / 4 mph 29 / 28°F 73% 1020 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 3%
Most Significant Cloud Type: medium
8%
0.0 In
07:00

SSE
SSE

4 / 8 mph 23 / 18°F 40% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

WNW
WNW

6 / 14 mph 45 / 41°F 47% 1018 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
19:00

NW
NW

10 / 20 mph 46 / 41°F 36% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
Sat 01
Jun
01:00

SE
SE

3 / 6 mph 28 / 25°F 82% 1022 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 9%
Most Significant Cloud Type: medium
15%
0.1 In
07:00

SSE
SSE

8 / 17 mph 27 / 19°F 55% 1025 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
13:00

WSW
WSW

8 / 16 mph 48 / 44°F 37% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

NNW
NNW

8 / 17 mph 49 / 45°F 42% 1019 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
Sun 02
Jun
01:00

NW
NW

3 / 7 mph 31 / 28°F 89% 1022 mb
Low level cloud: 16%
Mid level cloud: 29%
High level cloud: 43%
Most Significant Cloud Type: low
31%
0.3 In
07:00

S
S

6 / 13 mph 30 / 24°F 63% 1021 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
13:00

NW
NW

10 / 21 mph 42 / 37°F 70% 1019 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 2%
Most Significant Cloud Type: medium
18%
0.0 In
19:00

WNW
WNW

13 / 26 mph 49 / 44°F 46% 1015 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: medium
22%
0.1 In
Mon 03
Jun
01:00

NW
NW

4 / 9 mph 27 / 22°F 94% 1025 mb
Low level cloud: 44%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
59%
0.1 In
07:00

SSW
SSW

8 / 16 mph 31 / 24°F 64% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: medium
7%
0.0 In
13:00

NNW
NNW

4 / 9 mph 42 / 39°F 23% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

W
W

29 / 61 mph 48 / 39°F 47% 1010 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 11%
Most Significant Cloud Type: medium
27%
0.0 In

Other Locations Near to Tjan-San (mtn Stn)

Cities and Towns: Bolsaja Kzyl, Russia

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