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Pepperell 14 Day Long Range Forecast

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

Massachusetts, United States Of America

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

Reviewing the forecast for Pepperell Over the next 14 days and the average daytime maximum temperature will be around 12°C, with a high for the two weeks of 15°C expected on the afternoon of Sunday 17th. The average minimum temperature will be 4°C, dipping to its lowest on the morning of Friday 15th at -2°C. The fortnight ahead will have mixed overhead conditions with some days dry and some seeing a significant amount of rain or snow. The indicators are that Friday 22nd will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 14
Nov		01:00

N
N

 5 / 8 mph 29 / 24°F 46% 1032 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

NNW
NNW

 4 / 9 mph 26 / 20°F 51% 1030 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
07:00

N
N

 4 / 9 mph 26 / 20°F 49% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 6 / 7 mph 39 / 35°F 26% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 7 / 8 mph 45 / 41°F 19% 1024 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
16:00

NNE
NNE

 2 / 4 mph 37 / 36°F 28% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 2 / 5 mph 32 / 30°F 31% 1021 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
22:00

NNW
NNW

 3 / 7 mph 30 / 27°F 35% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 55%
Most Significant Cloud Type: high
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 15
Nov		19:00

NW
NW

 8 / 14 mph 43 / 39°F 34% 1005 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
22:00

NW
NW

 7 / 13 mph 42 / 37°F 40% 1005 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
Sat 16
Nov		01:00

NW
NW

 7 / 14 mph 41 / 36°F 45% 1004 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 5%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 9 / 18 mph 42 / 37°F 42% 1005 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 10 / 20 mph 42 / 37°F 41% 1006 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
10:00

NW
NW

 13 / 15 mph 53 / 49°F 30% 1007 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 12 / 14 mph 57 / 54°F 25% 1007 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
16:00

NW
NW

 11 / 14 mph 53 / 49°F 30% 1010 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
19:00

NW
NW

 9 / 11 mph 49 / 45°F 38% 1012 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
22:00

NW
NW

 9 / 13 mph 44 / 40°F 42% 1013 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
Sun 17
Nov		01:00

NW
NW

 9 / 15 mph 42 / 37°F 43% 1013 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

NW
NW

 8 / 12 mph 42 / 37°F 47% 1014 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
07:00

NW
NW

 6 / 11 mph 40 / 35°F 53% 1015 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
10:00

NNW
NNW

 9 / 10 mph 52 / 49°F 34% 1015 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
13:00

NNW
NNW

 10 / 11 mph 58 / 56°F 25% 1013 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

NW
NW

 5 / 8 mph 52 / 50°F 42% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 18%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 3 / 7 mph 44 / 43°F 50% 1014 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 33%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 3 / 6 mph 43 / 42°F 51% 1013 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 50%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 18
Nov		01:00

W
W

 2 / 5 mph 40 / 40°F 55% 1011 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 74%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 2 / 4 mph 38 / 37°F 56% 1009 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 2 / 5 mph 40 / 38°F 51% 1008 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 36%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 7 / 9 mph 50 / 47°F 61% 1006 mb
Low level cloud: 21%
Mid level cloud: 77%
High level cloud: 64%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 13 / 15 mph 58 / 55°F 54% 1004 mb
Low level cloud: 55%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 10 / 15 mph 53 / 50°F 63% 1005 mb
Low level cloud: 26%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 10 / 13 mph 50 / 46°F 67% 1006 mb
Low level cloud: 21%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 8 / 13 mph 45 / 41°F 68% 1007 mb
Low level cloud: 92%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 19
Nov		01:00

WNW
WNW

 10 / 13 mph 46 / 41°F 65% 1007 mb
Low level cloud: 71%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 11 / 14 mph 46 / 40°F 68% 1008 mb
Low level cloud: 9%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 10 / 14 mph 44 / 38°F 74% 1009 mb
Low level cloud: 69%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 14 / 16 mph 50 / 45°F 55% 1009 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
13:00

NW
NW

 13 / 15 mph 53 / 49°F 48% 1007 mb
Low level cloud: 58%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 11 / 13 mph 50 / 46°F 58% 1008 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
19:00

NW
NW

 9 / 12 mph 46 / 41°F 66% 1009 mb
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 8 / 12 mph 43 / 39°F 71% 1009 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 22%
Most Significant Cloud Type: high
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 20
Nov		01:00

WNW
WNW

 7 / 10 mph 42 / 38°F 75% 1008 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
04:00

WNW
WNW

 6 / 10 mph 40 / 36°F 78% 1008 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 5 / 9 mph 37 / 33°F 86% 1009 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
10:00

NW
NW

 7 / 9 mph 50 / 46°F 52% 1008 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
13:00

NW
NW

 6 / 7 mph 56 / 55°F 41% 1006 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

NNW
NNW

 3 / 6 mph 51 / 50°F 55% 1007 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
19:00

NW
NW

 2 / 5 mph 43 / 43°F 69% 1009 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
22:00

N
N

 3 / 6 mph 40 / 39°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 21
Nov		01:00

WNW
WNW

 3 / 4 mph 45 / 44°F 66% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 21%
Most Significant Cloud Type: high
20%
0.0 In
07:00

E
E

 13 / 19 mph 54 / 50°F 97% 998 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SW
SW

 12 / 15 mph 46 / 40°F 45% 993 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SW
SW

 6 / 7 mph 43 / 39°F 51% 999 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
Fri 22
Nov		01:00

SSW
SSW

 12 / 16 mph 47 / 42°F 85% 1002 mb
Low level cloud: 95%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: low
96%
0.0 In
07:00

ESE
ESE

 11 / 21 mph 44 / 38°F 93% 1012 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SW
SW

 11 / 13 mph 51 / 47°F 39% 1007 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
19:00

SW
SW

 6 / 10 mph 44 / 40°F 67% 1005 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
Sat 23
Nov		01:00

WSW
WSW

 4 / 6 mph 45 / 42°F 90% 998 mb
Low level cloud: 88%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
07:00

W
W

 5 / 6 mph 40 / 36°F 73% 1004 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

WNW
WNW

 14 / 19 mph 48 / 42°F 74% 997 mb
Low level cloud: 78%
Mid level cloud: 28%
High level cloud: 18%
Most Significant Cloud Type: low
89%
0.0 In
19:00

W
W

 10 / 14 mph 40 / 34°F 71% 1007 mb
Low level cloud: 3%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: medium
54%
0.0 In
Sun 24
Nov		01:00

W
W

 10 / 14 mph 40 / 34°F 81% 1002 mb
Low level cloud: 23%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
31%
0.0 In
07:00

W
W

 12 / 17 mph 44 / 37°F 68% 1006 mb
Low level cloud: 22%
Mid level cloud: 35%
High level cloud: 11%
Most Significant Cloud Type: low
35%
0.0 In
13:00

WNW
WNW

 14 / 19 mph 43 / 36°F 52% 1003 mb
Low level cloud: 6%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: medium
64%
0.0 In
19:00

WNW
WNW

 9 / 11 mph 50 / 47°F 71% 1008 mb
Low level cloud: 18%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
Mon 25
Nov		01:00

NW
NW

 14 / 20 mph 37 / 29°F 65% 1008 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 71%
Most Significant Cloud Type: medium
49%
0.0 In
07:00

NW
NW

 9 / 13 mph 32 / 24°F 63% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 97%
Most Significant Cloud Type: high
96%
0.0 In
13:00

NNW
NNW

 9 / 13 mph 47 / 42°F 57% 1014 mb
Low level cloud: 55%
Mid level cloud: 9%
High level cloud: 62%
Most Significant Cloud Type: low
65%
0.0 In
19:00

SSE
SSE

 2 / 3 mph 42 / 41°F 59% 1016 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 1%
Most Significant Cloud Type: medium
27%
0.0 In
Tue 26
Nov		01:00

NW
NW

 4 / 5 mph 42 / 40°F 72% 1017 mb
Low level cloud: 94%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

E
E

 4 / 4 mph 38 / 35°F 97% 1010 mb
Low level cloud: 99%
Mid level cloud: 67%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

ENE
ENE

 4 / 6 mph 45 / 43°F 64% 1016 mb
Low level cloud: 96%
Mid level cloud: 20%
High level cloud: 17%
Most Significant Cloud Type: low
100%
0.0 In
19:00

N
N

 7 / 9 mph 41 / 36°F 98% 1005 mb
Low level cloud: 100%
Mid level cloud: 88%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.4 In
Wed 27
Nov		01:00

NE
NE

 5 / 7 mph 39 / 35°F 98% 1016 mb
Low level cloud: 95%
Mid level cloud: 97%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NNW
NNW

 6 / 8 mph 38 / 33°F 97% 1008 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.2 In
13:00

NNE
NNE

 9 / 13 mph 35 / 27°F 93% 1016 mb
Low level cloud: 87%
Mid level cloud: 100%
High level cloud: 25%
Most Significant Cloud Type: low
100%
0.1 In
19:00

NW
NW

 5 / 7 mph 41 / 37°F 98% 1012 mb
Low level cloud: 85%
Mid level cloud: 66%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
Thu 28
Nov		01:00

N
N

 9 / 13 mph 30 / 22°F 82% 1017 mb
Low level cloud: 20%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
30%
0.0 In
07:00

WNW
WNW

 8 / 11 mph 32 / 24°F 83% 1013 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 1%
Most Significant Cloud Type: medium
15%
0.0 In
13:00

NNW
NNW

 8 / 11 mph 42 / 38°F 50% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

WNW
WNW

 7 / 9 mph 39 / 34°F 82% 1012 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 19%
Most Significant Cloud Type: medium
10%
0.0 In
Fri 29
Nov		01:00

NW
NW

 10 / 15 mph 29 / 21°F 59% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

NW
NW

 4 / 5 mph 32 / 28°F 75% 1010 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 97%
Most Significant Cloud Type: medium
21%
0.0 In
13:00

NW
NW

 11 / 16 mph 41 / 35°F 48% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
19:00

NNW
NNW

 9 / 11 mph 31 / 24°F 72% 1012 mb
Low level cloud: 4%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
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