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Montana 14 Day Long Range Forecast

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

Switzerland

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

Taking a look at Montana over the coming two weeks and the average daytime maximum temperature will be around 3°C, with a high for the two weeks of 5°C expected on the afternoon of Wednesday 17th. The average minimum temperature will be -5°C, dipping to its lowest on the morning of Tuesday 23rd at -9°C. Expect the coming 14 days to remain predominantly dry. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 13
Dec		19:00

SE
SE

 5 / 11 mph 24 / 17°F 74% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 4 / 9 mph 23 / 18°F 72% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 14
Dec		01:00

SE
SE

 5 / 10 mph 23 / 17°F 72% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 5 / 11 mph 22 / 15°F 70% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 5 / 11 mph 22 / 15°F 70% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 3 / 7 mph 30 / 27°F 71% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 1 / 3 mph 38 / 37°F 80% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 4 / 9 mph 34 / 30°F 82% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 6 / 13 mph 26 / 19°F 71% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 6 / 13 mph 24 / 17°F 72% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 15
Dec		01:00

SE
SE

 6 / 13 mph 24 / 16°F 72% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 6 / 13 mph 23 / 15°F 73% 1027 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 17%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

 6 / 13 mph 24 / 16°F 74% 1026 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 14%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 5 / 11 mph 29 / 23°F 76% 1023 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 15%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 5 / 7 mph 38 / 33°F 81% 1020 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 89%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 6 / 13 mph 31 / 24°F 83% 1020 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 7 / 16 mph 27 / 19°F 82% 1022 mb
Low level cloud: 0%
Mid level cloud: 92%
High level cloud: 100%
Most Significant Cloud Type: medium
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 8 / 16 mph 25 / 16°F 83% 1023 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 82%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 16
Dec		01:00

ESE
ESE

 8 / 16 mph 26 / 18°F 85% 1020 mb
Low level cloud: 2%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 8 / 16 mph 27 / 19°F 86% 1019 mb
Low level cloud: 3%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 8 / 17 mph 27 / 18°F 87% 1019 mb
Low level cloud: 5%
Mid level cloud: 12%
High level cloud: 46%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 6 / 14 mph 31 / 24°F 87% 1019 mb
Low level cloud: 6%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 6 / 7 mph 39 / 34°F 88% 1017 mb
Low level cloud: 9%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 4 / 9 mph 32 / 28°F 90% 1018 mb
Low level cloud: 16%
Mid level cloud: 88%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 5 / 10 mph 29 / 24°F 88% 1021 mb
Low level cloud: 8%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 4 / 9 mph 29 / 25°F 89% 1022 mb
Low level cloud: 12%
Mid level cloud: 78%
High level cloud: 93%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 17
Dec		01:00

ESE
ESE

 5 / 10 mph 27 / 21°F 88% 1023 mb
Low level cloud: 6%
Mid level cloud: 43%
High level cloud: 11%
Most Significant Cloud Type: medium
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 4 / 9 mph 26 / 21°F 85% 1024 mb
Low level cloud: 1%
Mid level cloud: 44%
High level cloud: 29%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

 4 / 8 mph 26 / 21°F 86% 1025 mb
Low level cloud: 1%
Mid level cloud: 33%
High level cloud: 18%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 2 / 3 mph 32 / 32°F 82% 1025 mb
Low level cloud: 0%
Mid level cloud: 37%
High level cloud: 8%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 1 / 2 mph 41 / 40°F 83% 1023 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 2%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 0 / 0 mph 31 / 31°F 95% 1026 mb
Low level cloud: 43%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 2 / 4 mph 27 / 25°F 93% 1028 mb
Low level cloud: 26%
Mid level cloud: 41%
High level cloud: 5%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 3 / 6 mph 26 / 23°F 90% 1030 mb
Low level cloud: 10%
Mid level cloud: 25%
High level cloud: 11%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 18
Dec		01:00

SE
SE

 4 / 8 mph 25 / 21°F 86% 1030 mb
Low level cloud: 2%
Mid level cloud: 18%
High level cloud: 9%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 4 / 9 mph 25 / 20°F 85% 1030 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 5 / 11 mph 24 / 18°F 84% 1030 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 4 / 9 mph 30 / 26°F 82% 1028 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 3 / 4 mph 40 / 38°F 83% 1025 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 5 / 11 mph 31 / 25°F 88% 1026 mb
Low level cloud: 8%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 7 / 16 mph 26 / 18°F 83% 1029 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
22:00

SE
SE

 7 / 15 mph 25 / 17°F 83% 1029 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
Fri 19
Dec		01:00

SE
SE

 7 / 14 mph 25 / 17°F 83% 1028 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 6 / 13 mph 24 / 17°F 82% 1028 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 6 / 13 mph 24 / 17°F 80% 1028 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 4 / 9 mph 30 / 25°F 78% 1026 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 3 / 3 mph 39 / 38°F 78% 1023 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 4 / 8 mph 31 / 28°F 90% 1023 mb
Low level cloud: 11%
Mid level cloud: 49%
High level cloud: 18%
Most Significant Cloud Type: medium
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 4 / 8 mph 28 / 23°F 85% 1024 mb
Low level cloud: 0%
Mid level cloud: 91%
High level cloud: 74%
Most Significant Cloud Type: medium
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 3 / 6 mph 27 / 23°F 86% 1025 mb
Low level cloud: 1%
Mid level cloud: 100%
High level cloud: 37%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sat 20
Dec		01:00

ESE
ESE

 4 / 9 mph 34 / 29°F 93% 1023 mb
Low level cloud: 32%
Mid level cloud: 97%
High level cloud: 97%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

SE
SE

 4 / 9 mph 27 / 22°F 71% 1028 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NW
NW

 2 / 2 mph 41 / 41°F 75% 1024 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 13%
Most Significant Cloud Type: medium
19%
0.0 In
19:00

ESE
ESE

 4 / 6 mph 34 / 30°F 87% 1027 mb
Low level cloud: 3%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: low
7%
0.0 In
Sun 21
Dec		01:00

ESE
ESE

 3 / 6 mph 25 / 22°F 86% 1031 mb
Low level cloud: 3%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
0.0 In
07:00

SE
SE

 3 / 7 mph 28 / 25°F 73% 1027 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 99%
Most Significant Cloud Type: medium
10%
0.0 In
13:00

ENE
ENE

 2 / 3 mph 43 / 43°F 81% 1019 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 33%
Most Significant Cloud Type: medium
21%
0.0 In
19:00

ESE
ESE

 6 / 9 mph 33 / 28°F 86% 1017 mb
Low level cloud: 4%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: medium
76%
0.0 In
Mon 22
Dec		01:00

SSE
SSE

 3 / 5 mph 25 / 21°F 89% 1024 mb
Low level cloud: 21%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
07:00

SE
SE

 5 / 10 mph 28 / 22°F 85% 1019 mb
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
48%
0.0 In
13:00

W
W

 2 / 2 mph 38 / 37°F 78% 1022 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 8%
Most Significant Cloud Type: medium
17%
0.0 In
19:00

SE
SE

 4 / 5 mph 35 / 31°F 85% 1020 mb
Low level cloud: 2%
Mid level cloud: 19%
High level cloud: 10%
Most Significant Cloud Type: medium
24%
0.0 In
Tue 23
Dec		01:00

SSE
SSE

 4 / 9 mph 20 / 13°F 82% 1030 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

ESE
ESE

 2 / 5 mph 26 / 24°F 87% 1021 mb
Low level cloud: 3%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
54%
0.0 In
13:00

NW
NW

 3 / 3 mph 38 / 37°F 71% 1026 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 1%
Most Significant Cloud Type: medium
11%
0.0 In
19:00

NW
NW

 1 / 1 mph 34 / 34°F 97% 1020 mb
Low level cloud: 82%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Wed 24
Dec		01:00

SSE
SSE

 2 / 4 mph 22 / 22°F 90% 1028 mb
Low level cloud: 13%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

SE
SE

 3 / 5 mph 27 / 24°F 86% 1021 mb
Low level cloud: 4%
Mid level cloud: 26%
High level cloud: 22%
Most Significant Cloud Type: medium
37%
0.0 In
13:00

NNE
NNE

 4 / 5 mph 34 / 30°F 82% 1022 mb
Low level cloud: 7%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
48%
0.0 In
19:00

SE
SE

 4 / 4 mph 34 / 30°F 84% 1022 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 19%
Most Significant Cloud Type: medium
14%
0.0 In
Thu 25
Dec		01:00

SE
SE

 6 / 13 mph 17 / 8°F 81% 1027 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

SSE
SSE

 2 / 4 mph 25 / 23°F 78% 1022 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
13:00

E
E

 3 / 4 mph 36 / 34°F 67% 1024 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
19:00

SSW
SSW

 2 / 2 mph 32 / 32°F 94% 1016 mb
Low level cloud: 61%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.0 In
Fri 26
Dec		01:00

SE
SE

 6 / 14 mph 15 / 6°F 63% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

SE
SE

 6 / 11 mph 22 / 15°F 77% 1018 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.1 In
13:00

NE
NE

 2 / 2 mph 38 / 38°F 60% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

ESE
ESE

 4 / 5 mph 28 / 23°F 78% 1023 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 18%
Most Significant Cloud Type: medium
10%
0.0 In
Sat 27
Dec		01:00

ESE
ESE

 5 / 11 mph 21 / 14°F 59% 1032 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 17%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

SE
SE

 4 / 8 mph 21 / 16°F 71% 1026 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 13%
Most Significant Cloud Type: medium
5%
0.0 In
13:00

NE
NE

 3 / 3 mph 38 / 36°F 64% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SE
SE

 4 / 9 mph 24 / 18°F 76% 1024 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: medium
12%
0.0 In
Sun 28
Dec		01:00

ESE
ESE

 5 / 11 mph 22 / 15°F 55% 1035 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

ESE
ESE

 4 / 9 mph 21 / 14°F 74% 1027 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 86%
Most Significant Cloud Type: medium
11%
0.0 In
13:00

SSE
SSE

 1 / 2 mph 36 / 36°F 71% 1033 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
19:00

ESE
ESE

 6 / 13 mph 22 / 14°F 73% 1025 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 32%
Most Significant Cloud Type: medium
28%
0.0 In

Other Locations Near to Montana

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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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.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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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.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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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.
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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.
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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.
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Pressure