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Troy 14 Day Long Range Forecast

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

Michigan, United States Of America

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

The outlook for Troy in the two weeks ahead shows the average daytime maximum temperature will be around 9°C, with a high for the two weeks of 22°C expected on the afternoon of Sunday 22nd. The average minimum temperature will be 0°C, dipping to its lowest on the morning of Wednesday 18th at -6°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain or snow. The current forecast indicates Thursday 26th will have the most precipitation with an accumulation of around 19.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 17
Mar		01:00

WNW
WNW

 18 / 20 mph 21 / 6°F 58% 1006 mb
Low level cloud: 85%
Mid level cloud: 77%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 16 / 20 mph 19 / 4°F 54% 1009 mb
Low level cloud: 78%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 14 / 16 mph 19 / 5°F 54% 1014 mb
Low level cloud: 82%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 13 / 15 mph 23 / 11°F 40% 1017 mb
Low level cloud: 23%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 11 / 12 mph 26 / 16°F 37% 1019 mb
Low level cloud: 2%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 12 / 14 mph 25 / 14°F 36% 1020 mb
Low level cloud: 1%
Mid level cloud: 100%
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

WNW
WNW

 10 / 12 mph 25 / 15°F 39% 1022 mb
Low level cloud: 3%
Mid level cloud: 63%
High level cloud: 2%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 9 / 11 mph 25 / 15°F 41% 1024 mb
Low level cloud: 31%
Mid level cloud: 43%
High level cloud: 42%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 18
Mar		19:00

S
S

 9 / 13 mph 32 / 25°F 90% 1019 mb
Low level cloud: 92%
Mid level cloud: 44%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 9 / 13 mph 33 / 25°F 97% 1019 mb
Low level cloud: 99%
Mid level cloud: 74%
High level cloud: 41%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 19
Mar		01:00

SSW
SSW

 7 / 11 mph 33 / 26°F 95% 1017 mb
Low level cloud: 61%
Mid level cloud: 46%
High level cloud: 45%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 6 / 9 mph 33 / 27°F 93% 1017 mb
Low level cloud: 76%
Mid level cloud: 44%
High level cloud: 34%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 3 / 5 mph 33 / 30°F 91% 1018 mb
Low level cloud: 45%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 7 / 9 mph 38 / 33°F 77% 1020 mb
Low level cloud: 92%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 7 / 8 mph 40 / 35°F 73% 1020 mb
Low level cloud: 93%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 7 / 9 mph 43 / 39°F 62% 1020 mb
Low level cloud: 72%
Mid level cloud: 6%
High level cloud: 13%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 3 / 5 mph 42 / 40°F 70% 1021 mb
Low level cloud: 32%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 2 / 3 mph 39 / 38°F 82% 1021 mb
Low level cloud: 13%
Mid level cloud: 5%
High level cloud: 19%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 20
Mar		01:00

S
S

 5 / 9 mph 36 / 32°F 87% 1020 mb
Low level cloud: 5%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 6 / 11 mph 36 / 31°F 90% 1017 mb
Low level cloud: 19%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 9 / 16 mph 38 / 32°F 95% 1014 mb
Low level cloud: 52%
Mid level cloud: 89%
High level cloud: 89%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 13 / 18 mph 48 / 42°F 79% 1012 mb
Low level cloud: 55%
Mid level cloud: 73%
High level cloud: 26%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 9 / 15 mph 48 / 44°F 91% 1010 mb
Low level cloud: 99%
Mid level cloud: 94%
High level cloud: 31%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

NNW
NNW

 5 / 9 mph 48 / 45°F 97% 1008 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 37%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 5 / 6 mph 45 / 42°F 99% 1009 mb
Low level cloud: 98%
Mid level cloud: 46%
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

 6 / 7 mph 42 / 38°F 94% 1011 mb
Low level cloud: 98%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 21
Mar		01:00

N
N

 8 / 9 mph 39 / 34°F 90% 1012 mb
Low level cloud: 85%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 5 / 6 mph 37 / 33°F 92% 1013 mb
Low level cloud: 90%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 2 / 3 mph 37 / 36°F 87% 1013 mb
Low level cloud: 80%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 1 / 1 mph 42 / 42°F 77% 1014 mb
Low level cloud: 57%
Mid level cloud: 38%
High level cloud: 15%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 6 / 7 mph 51 / 47°F 60% 1011 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 47%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 9 / 11 mph 58 / 55°F 53% 1008 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 59%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 9 / 12 mph 53 / 50°F 73% 1007 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 56%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 5 / 10 mph 49 / 47°F 83% 1007 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 87%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 22
Mar		01:00

SSW
SSW

 6 / 13 mph 47 / 44°F 88% 1006 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 33%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 6 / 14 mph 47 / 44°F 90% 1004 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 4 / 8 mph 48 / 46°F 93% 1005 mb
Low level cloud: 4%
Mid level cloud: 4%
High level cloud: 40%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 6 / 7 mph 57 / 55°F 76% 1004 mb
Low level cloud: 10%
Mid level cloud: 49%
High level cloud: 32%
Most Significant Cloud Type: medium
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 14 / 17 mph 71 / 70°F 52% 1000 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 35%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 11 / 13 mph 70 / 69°F 55% 999 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 17 / 19 mph 41 / 33°F 76% 1006 mb
Low level cloud: 84%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 17 / 19 mph 36 / 26°F 75% 1011 mb
Low level cloud: 95%
Mid level cloud: 29%
High level cloud: 11%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 23
Mar		01:00

NNE
NNE

 16 / 18 mph 33 / 23°F 75% 1016 mb
Low level cloud: 100%
Mid level cloud: 8%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 15 / 17 mph 31 / 20°F 70% 1019 mb
Low level cloud: 100%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 14 / 16 mph 30 / 19°F 66% 1023 mb
Low level cloud: 100%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 13 / 15 mph 33 / 23°F 53% 1026 mb
Low level cloud: 44%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

 12 / 13 mph 39 / 31°F 38% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 12 / 14 mph 39 / 31°F 33% 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
19:00

NNE
NNE

 11 / 13 mph 31 / 22°F 43% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 10 / 11 mph 27 / 17°F 53% 1033 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 24
Mar		01:00

ENE
ENE

 5 / 8 mph 35 / 30°F 58% 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

NNE
NNE

 7 / 10 mph 28 / 20°F 60% 1035 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
13%
0.0 In
13:00

ESE
ESE

 13 / 17 mph 34 / 25°F 33% 1034 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SSE
SSE

 17 / 23 mph 41 / 33°F 89% 1021 mb
Low level cloud: 100%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Wed 25
Mar		01:00

SE
SE

 6 / 9 mph 36 / 31°F 99% 1019 mb
Low level cloud: 100%
Mid level cloud: 81%
High level cloud: 74%
Most Significant Cloud Type: low
100%
0.0 In
07:00

E
E

 9 / 11 mph 36 / 29°F 47% 1026 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: medium
30%
0.0 In
13:00

ESE
ESE

 13 / 17 mph 44 / 38°F 42% 1016 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
0.0 In
19:00

ENE
ENE

 8 / 12 mph 36 / 29°F 47% 1032 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 11%
Most Significant Cloud Type: medium
28%
0.0 In
Thu 26
Mar		01:00

SE
SE

 12 / 18 mph 37 / 29°F 66% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 80%
Most Significant Cloud Type: medium
8%
0.0 In
07:00

SE
SE

 12 / 18 mph 35 / 26°F 72% 1015 mb
Low level cloud: 41%
Mid level cloud: 83%
High level cloud: 62%
Most Significant Cloud Type: low
77%
0.0 In
13:00

SSW
SSW

 21 / 31 mph 49 / 42°F 89% 1004 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
19:00

NNW
NNW

 10 / 14 mph 48 / 44°F 93% 1007 mb
Low level cloud: 86%
Mid level cloud: 81%
High level cloud: 93%
Most Significant Cloud Type: low
100%
0.8 In
Fri 27
Mar		01:00

W
W

 11 / 15 mph 46 / 41°F 70% 1008 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.3 In
07:00

W
W

 5 / 7 mph 36 / 31°F 100% 1020 mb
Low level cloud: 92%
Mid level cloud: 56%
High level cloud: 97%
Most Significant Cloud Type: low
100%
0.5 In
13:00

W
W

 18 / 26 mph 36 / 26°F 40% 1016 mb
Low level cloud: 1%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

N
N

 9 / 13 mph 32 / 24°F 73% 1030 mb
Low level cloud: 71%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: low
74%
0.1 In
Sat 28
Mar		01:00

NW
NW

 15 / 22 mph 22 / 9°F 43% 1024 mb
Low level cloud: 59%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
07:00

NNE
NNE

 2 / 4 mph 30 / 28°F 59% 1037 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

 10 / 15 mph 28 / 19°F 36% 1027 mb
Low level cloud: 3%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

WSW
WSW

 5 / 8 mph 40 / 37°F 42% 1032 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.0 In
Sun 29
Mar		01:00

WNW
WNW

 5 / 7 mph 27 / 22°F 42% 1028 mb
Low level cloud: 1%
Mid level cloud: 44%
High level cloud: 3%
Most Significant Cloud Type: medium
46%
0.0 In
07:00

SW
SW

 10 / 15 mph 34 / 26°F 39% 1033 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
13:00

NNW
NNW

 12 / 19 mph 26 / 15°F 22% 1031 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.0 In
19:00

WSW
WSW

 10 / 15 mph 47 / 42°F 45% 1030 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Mon 30
Mar		01:00

ENE
ENE

 5 / 7 mph 28 / 22°F 38% 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

SW
SW

 6 / 9 mph 40 / 35°F 58% 1031 mb
Low level cloud: 0%
Mid level cloud: 54%
High level cloud: 100%
Most Significant Cloud Type: medium
57%
0.0 In
13:00

SSE
SSE

 14 / 21 mph 31 / 21°F 35% 1029 mb
Low level cloud: 0%
Mid level cloud: 93%
High level cloud: 97%
Most Significant Cloud Type: medium
97%
0.0 In
19:00

SE
SE

 13 / 20 mph 44 / 37°F 70% 1018 mb
Low level cloud: 82%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Tue 31
Mar		01:00

SE
SE

 15 / 22 mph 30 / 19°F 97% 1014 mb
Low level cloud: 85%
Mid level cloud: 56%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.1 In
07:00

SW
SW

 17 / 28 mph 56 / 52°F 95% 993 mb
Low level cloud: 92%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.9 In
13:00

WSW
WSW

 11 / 17 mph 34 / 26°F 100% 1007 mb
Low level cloud: 95%
Mid level cloud: 71%
High level cloud: 42%
Most Significant Cloud Type: low
100%
0.5 In
19:00

NW
NW

 16 / 28 mph 36 / 26°F 71% 1015 mb
Low level cloud: 35%
Mid level cloud: 1%
High level cloud: 6%
Most Significant Cloud Type: low
36%
0.1 In
Wed 01
Apr		01:00

W
W

 14 / 21 mph 31 / 21°F 86% 1015 mb
Low level cloud: 94%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
07:00

NW
NW

 12 / 21 mph 29 / 19°F 65% 1021 mb
Low level cloud: 22%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
13:00

WNW
WNW

 9 / 15 mph 36 / 29°F 71% 1022 mb
Low level cloud: 100%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
19:00

N
N

 6 / 11 mph 40 / 35°F 44% 1022 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 10%
Most Significant Cloud Type: medium
47%
0.0 In

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