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St. Peters 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for St. Peters

Missouri, United States Of America

Long range weather outlook for St. Peters includes 14 day forecast summary:

Over the next 14 days the St. Peters forecast suggests the average daytime maximum temperature will be around 28°C, with a high for the two weeks of 33°C expected on the afternoon of Tuesday 21st. The mean minimum temperature will be 18°C, dipping to its lowest on the morning of Thursday 23rd at 12°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. It looks like Wednesday 22nd 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
Fri 17
May		00:00

SW
SW

 4 / 8 mph 63 / 63°F 96% 1009 mb
Low level cloud: 13%
Mid level cloud: 18%
High level cloud: 35%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 3 / 7 mph 60 / 60°F 94% 1008 mb
Low level cloud: 7%
Mid level cloud: 27%
High level cloud: 70%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 3 / 5 mph 64 / 61°F 94% 1009 mb
Low level cloud: 19%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 2 / 2 mph 75 / 76°F 78% 1009 mb
Low level cloud: 1%
Mid level cloud: 17%
High level cloud: 1%
Most Significant Cloud Type: medium
21%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

SSE
SSE

 5 / 7 mph 79 / 79°F 65% 1008 mb
Low level cloud: 15%
Mid level cloud: 14%
High level cloud: 9%
Most Significant Cloud Type: low
20%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

WSW
WSW

 5 / 6 mph 81 / 80°F 63% 1007 mb
Low level cloud: 38%
Mid level cloud: 16%
High level cloud: 5%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 3 / 4 mph 77 / 78°F 80% 1007 mb
Low level cloud: 3%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 5 / 9 mph 68 / 68°F 91% 1008 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		18:00

NNE
NNE

 5 / 6 mph 84 / 85°F 68% 1011 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 3 / 5 mph 75 / 79°F 76% 1012 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

S
S

 2 / 5 mph 70 / 70°F 80% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

 3 / 7 mph 68 / 67°F 86% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 3 / 5 mph 70 / 67°F 86% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 4 / 4 mph 81 / 81°F 67% 1015 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
12:00

SSE
SSE

 7 / 8 mph 87 / 86°F 51% 1013 mb
Low level cloud: 2%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 8 / 10 mph 88 / 88°F 50% 1012 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 11 / 19 mph 81 / 82°F 65% 1011 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 8 / 15 mph 74 / 77°F 72% 1012 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
Mon 20
May		00:00

S
S

 9 / 15 mph 71 / 71°F 79% 1012 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 4%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 11 / 19 mph 70 / 70°F 77% 1011 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 33%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 8 / 12 mph 72 / 69°F 82% 1011 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 9%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 11 / 14 mph 78 / 78°F 73% 1012 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 91%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 11 / 13 mph 83 / 83°F 61% 1011 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 16%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 10 / 12 mph 88 / 89°F 51% 1009 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 6%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 8 / 14 mph 84 / 85°F 67% 1009 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
21:00

SSE
SSE

 8 / 15 mph 75 / 78°F 79% 1009 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
Tue 21
May		00:00

SSE
SSE

 9 / 16 mph 74 / 77°F 81% 1008 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
03:00

S
S

 9 / 16 mph 72 / 76°F 81% 1008 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 11 / 18 mph 73 / 76°F 80% 1008 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 16 / 19 mph 83 / 85°F 65% 1007 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

 18 / 21 mph 90 / 94°F 49% 1004 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 17 / 22 mph 91 / 95°F 48% 1002 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 18%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 15 / 26 mph 85 / 86°F 57% 1002 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

 2 / 2 mph 69 / 69°F 96% 1004 mb
Low level cloud: 27%
Mid level cloud: 45%
High level cloud: 99%
Most Significant Cloud Type: low
54%
Expect 0.5 In of precipitation over the past 3 hours.
0.5 In
Wed 22
May		00:00

S
S

 7 / 13 mph 70 / 70°F 97% 1005 mb
Low level cloud: 52%
Mid level cloud: 74%
High level cloud: 91%
Most Significant Cloud Type: low
88%
Expect 0.5 In of precipitation over the past 3 hours.
0.5 In
03:00

S
S

 10 / 17 mph 70 / 70°F 96% 1004 mb
Low level cloud: 30%
Mid level cloud: 44%
High level cloud: 97%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 10 / 16 mph 72 / 75°F 94% 1004 mb
Low level cloud: 30%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 13 / 16 mph 82 / 85°F 73% 1004 mb
Low level cloud: 41%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 16 / 18 mph 89 / 94°F 61% 1003 mb
Low level cloud: 52%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 16 / 27 mph 84 / 89°F 76% 1003 mb
Low level cloud: 24%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

NW
NW

 15 / 19 mph 67 / 67°F 86% 1006 mb
Low level cloud: 90%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 11 / 15 mph 65 / 65°F 76% 1010 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		00:00

NW
NW

 12 / 16 mph 60 / 60°F 86% 1012 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 9 / 14 mph 55 / 53°F 93% 1014 mb
Low level cloud: 42%
Mid level cloud: 1%
High level cloud: 2%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

 6 / 8 mph 57 / 53°F 91% 1015 mb
Low level cloud: 63%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 7 / 8 mph 63 / 63°F 73% 1017 mb
Low level cloud: 93%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 7 / 8 mph 68 / 67°F 61% 1018 mb
Low level cloud: 95%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 6 / 8 mph 71 / 68°F 62% 1018 mb
Low level cloud: 27%
Mid level cloud: 20%
High level cloud: 1%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 5 / 6 mph 70 / 68°F 70% 1017 mb
Low level cloud: 14%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 4 / 7 mph 61 / 62°F 81% 1020 mb
Low level cloud: 10%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May		00:00

SSE
SSE

 7 / 15 mph 67 / 67°F 93% 1017 mb
Low level cloud: 16%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In
06:00

SSE
SSE

 7 / 15 mph 68 / 68°F 96% 1008 mb
Low level cloud: 51%
Mid level cloud: 43%
High level cloud: 93%
Most Significant Cloud Type: low
77%
0.0 In
12:00

SSW
SSW

 15 / 31 mph 80 / 84°F 71% 1005 mb
Low level cloud: 74%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.0 In
18:00

SW
SW

 12 / 24 mph 89 / 99°F 64% 1005 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
Sat 25
May		00:00

SSE
SSE

 14 / 30 mph 71 / 71°F 86% 1007 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
06:00

S
S

 7 / 15 mph 70 / 70°F 94% 1007 mb
Low level cloud: 5%
Mid level cloud: 32%
High level cloud: 9%
Most Significant Cloud Type: medium
46%
0.0 In
12:00

SSW
SSW

 11 / 23 mph 87 / 93°F 58% 1009 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: medium
46%
0.0 In
18:00

SSE
SSE

 15 / 30 mph 80 / 82°F 63% 1010 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 87%
Most Significant Cloud Type: medium
18%
0.0 In
Sun 26
May		00:00

SSW
SSW

 8 / 17 mph 77 / 80°F 72% 1009 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 17%
Most Significant Cloud Type: medium
16%
0.0 In
06:00

SSW
SSW

 11 / 24 mph 69 / 69°F 92% 1010 mb
Low level cloud: 19%
Mid level cloud: 11%
High level cloud: 50%
Most Significant Cloud Type: low
29%
0.2 In
12:00

SSW
SSW

 9 / 19 mph 88 / 94°F 55% 1009 mb
Low level cloud: 1%
Mid level cloud: 25%
High level cloud: 14%
Most Significant Cloud Type: medium
28%
0.0 In
18:00

W
W

 6 / 13 mph 80 / 85°F 75% 1009 mb
Low level cloud: 15%
Mid level cloud: 56%
High level cloud: 5%
Most Significant Cloud Type: medium
98%
0.0 In
Mon 27
May		00:00

WNW
WNW

 8 / 17 mph 71 / 71°F 96% 1011 mb
Low level cloud: 58%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
85%
0.3 In
06:00

N
N

 1 / 2 mph 67 / 67°F 94% 1014 mb
Low level cloud: 89%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.2 In
12:00

WSW
WSW

 6 / 14 mph 83 / 88°F 68% 1012 mb
Low level cloud: 59%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.2 In
18:00

NE
NE

 10 / 21 mph 70 / 70°F 80% 1013 mb
Low level cloud: 66%
Mid level cloud: 75%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.1 In
Tue 28
May		00:00

NNW
NNW

 8 / 16 mph 63 / 63°F 98% 1015 mb
Low level cloud: 91%
Mid level cloud: 50%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.7 In
06:00

ENE
ENE

 7 / 15 mph 65 / 65°F 84% 1015 mb
Low level cloud: 38%
Mid level cloud: 30%
High level cloud: 21%
Most Significant Cloud Type: low
51%
0.1 In
12:00

ENE
ENE

 9 / 20 mph 66 / 66°F 73% 1019 mb
Low level cloud: 94%
Mid level cloud: 46%
High level cloud: 31%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ESE
ESE

 4 / 8 mph 73 / 77°F 89% 1015 mb
Low level cloud: 2%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
0.5 In
Wed 29
May		00:00

NNE
NNE

 10 / 21 mph 60 / 60°F 94% 1019 mb
Low level cloud: 84%
Mid level cloud: 76%
High level cloud: 1%
Most Significant Cloud Type: low
100%
0.2 In
06:00

NE
NE

 5 / 11 mph 64 / 64°F 89% 1016 mb
Low level cloud: 2%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
0.0 In
12:00

NNE
NNE

 12 / 24 mph 70 / 70°F 58% 1022 mb
Low level cloud: 49%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
18:00

N
N

 6 / 12 mph 62 / 62°F 95% 1016 mb
Low level cloud: 51%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.1 In
Thu 30
May		00:00

NE
NE

 3 / 6 mph 65 / 65°F 78% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

WNW
WNW

 6 / 14 mph 57 / 56°F 94% 1017 mb
Low level cloud: 18%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
12:00

ESE
ESE

 6 / 13 mph 78 / 79°F 44% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

WNW
WNW

 10 / 20 mph 68 / 68°F 74% 1014 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
Fri 31
May		00:00

SE
SE

 5 / 11 mph 67 / 67°F 80% 1023 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

NW
NW

 5 / 11 mph 59 / 58°F 91% 1016 mb
Low level cloud: 32%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
12:00

SSE
SSE

 10 / 21 mph 77 / 79°F 51% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 37%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

NNW
NNW

 9 / 19 mph 66 / 65°F 65% 1018 mb
Low level cloud: 2%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
0.0 In
Sat 01
Jun		00:00

SSE
SSE

 7 / 15 mph 67 / 67°F 81% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

NW
NW

 6 / 12 mph 54 / 53°F 87% 1023 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
12:00

SSE
SSE

 12 / 25 mph 70 / 70°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
18:00

NW
NW

 6 / 12 mph 68 / 68°F 66% 1023 mb
Low level cloud: 25%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
28%
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