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Westford 14 Day Long Range Forecast

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

Massachusetts, United States Of America

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

The forecast for Westford in the coming two weeks is predicting the average daytime maximum temperature will be around 11°C, with a high for the two weeks of 14°C expected on the afternoon of Monday 18th. The mean minimum temperature will be 5°C, dipping to its lowest on the morning of Friday 15th at -1°C. The coming 14 days will have some days seeing a little precipitation and some days with rain or snow. Predictions are 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 / 6 mph 33 / 28°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

N
N

 5 / 9 mph 28 / 22°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

 5 / 9 mph 28 / 22°F 50% 1029 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
10:00

NNE
NNE

 6 / 8 mph 38 / 33°F 33% 1029 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
13:00

NE
NE

 7 / 9 mph 43 / 39°F 22% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 2 / 4 mph 40 / 38°F 28% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 2 / 4 mph 35 / 35°F 33% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 86%
Most Significant Cloud Type: high
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 4 / 7 mph 33 / 30°F 35% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 57%
Most Significant Cloud Type: high
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 15
Nov		19:00

NW
NW

 6 / 11 mph 44 / 41°F 35% 1005 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 5 / 10 mph 43 / 39°F 41% 1005 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 16
Nov		01:00

WNW
WNW

 5 / 9 mph 41 / 38°F 48% 1004 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 6 / 11 mph 42 / 38°F 46% 1005 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 18%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 7 / 14 mph 43 / 39°F 43% 1006 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
10:00

NW
NW

 12 / 16 mph 53 / 49°F 29% 1007 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
13:00

NNW
NNW

 12 / 16 mph 56 / 53°F 24% 1007 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
16:00

NW
NW

 10 / 14 mph 54 / 51°F 30% 1009 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

 10 / 11 mph 50 / 46°F 37% 1012 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
22:00

NW
NW

 8 / 11 mph 46 / 42°F 42% 1012 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
Sun 17
Nov		01:00

NW
NW

 8 / 14 mph 43 / 38°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 46% 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 / 9 mph 41 / 37°F 52% 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

 8 / 10 mph 50 / 47°F 36% 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

 9 / 12 mph 57 / 55°F 26% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 5 / 8 mph 53 / 51°F 40% 1014 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 13%
Most Significant Cloud Type: high
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 3 / 5 mph 47 / 46°F 50% 1014 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 3 / 5 mph 45 / 44°F 51% 1013 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 50%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 18
Nov		01:00

W
W

 2 / 3 mph 44 / 44°F 54% 1011 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 80%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 2 / 4 mph 42 / 42°F 56% 1009 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 86%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 2 / 4 mph 42 / 42°F 52% 1008 mb
Low level cloud: 0%
Mid level cloud: 55%
High level cloud: 95%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 6 / 10 mph 48 / 45°F 64% 1007 mb
Low level cloud: 38%
Mid level cloud: 87%
High level cloud: 31%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 13 / 16 mph 58 / 55°F 54% 1004 mb
Low level cloud: 68%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 10 / 16 mph 54 / 51°F 60% 1005 mb
Low level cloud: 61%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 10 / 15 mph 49 / 45°F 67% 1006 mb
Low level cloud: 23%
Mid level cloud: 46%
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

 8 / 13 mph 46 / 42°F 65% 1007 mb
Low level cloud: 92%
Mid level cloud: 36%
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 / 15 mph 46 / 41°F 64% 1007 mb
Low level cloud: 80%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 11 / 17 mph 46 / 40°F 66% 1008 mb
Low level cloud: 15%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 11 / 16 mph 43 / 38°F 73% 1008 mb
Low level cloud: 67%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

 14 / 17 mph 49 / 44°F 53% 1008 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
13:00

NW
NW

 14 / 17 mph 53 / 48°F 46% 1007 mb
Low level cloud: 47%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 11 / 14 mph 51 / 46°F 56% 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

 8 / 12 mph 46 / 42°F 64% 1008 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 8 / 12 mph 44 / 40°F 70% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: high
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 20
Nov		01:00

WNW
WNW

 7 / 11 mph 43 / 39°F 74% 1008 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
04:00

WNW
WNW

 6 / 10 mph 41 / 37°F 77% 1008 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 5 / 8 mph 40 / 36°F 84% 1008 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
10:00

NW
NW

 7 / 9 mph 48 / 45°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 55 / 53°F 40% 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 / 5 mph 53 / 53°F 53% 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

NNW
NNW

 2 / 3 mph 47 / 47°F 66% 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

NNE
NNE

 3 / 5 mph 43 / 42°F 75% 1010 mb
Low level cloud: 0%
Mid level cloud: 14%
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 46 / 45°F 64% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
32%
0.0 In
07:00

ESE
ESE

 13 / 20 mph 54 / 50°F 97% 998 mb
Low level cloud: 98%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SW
SW

 12 / 16 mph 45 / 39°F 42% 993 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SW
SW

 6 / 6 mph 45 / 42°F 50% 999 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
Fri 22
Nov		01:00

SSW
SSW

 12 / 19 mph 47 / 41°F 82% 1003 mb
Low level cloud: 97%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
07:00

ESE
ESE

 11 / 21 mph 45 / 39°F 91% 1012 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SW
SW

 10 / 14 mph 50 / 46°F 37% 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 / 9 mph 46 / 43°F 66% 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 / 43°F 87% 998 mb
Low level cloud: 87%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WSW
WSW

 5 / 6 mph 40 / 37°F 72% 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 / 21 mph 44 / 37°F 72% 997 mb
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
19:00

WSW
WSW

 9 / 14 mph 41 / 35°F 69% 1007 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 1%
Most Significant Cloud Type: medium
100%
0.0 In
Sun 24
Nov		01:00

W
W

 10 / 15 mph 40 / 33°F 78% 1002 mb
Low level cloud: 16%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
07:00

W
W

 11 / 17 mph 44 / 38°F 69% 1006 mb
Low level cloud: 18%
Mid level cloud: 40%
High level cloud: 13%
Most Significant Cloud Type: low
33%
0.0 In
13:00

WNW
WNW

 13 / 18 mph 42 / 35°F 51% 1003 mb
Low level cloud: 19%
Mid level cloud: 59%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

WNW
WNW

 9 / 11 mph 50 / 46°F 72% 1008 mb
Low level cloud: 41%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.0 In
Mon 25
Nov		01:00

NW
NW

 13 / 21 mph 37 / 29°F 64% 1008 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 88%
Most Significant Cloud Type: medium
46%
0.0 In
07:00

NW
NW

 8 / 12 mph 32 / 25°F 62% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 98%
Most Significant Cloud Type: high
97%
0.0 In
13:00

NNW
NNW

 8 / 11 mph 46 / 42°F 56% 1014 mb
Low level cloud: 95%
Mid level cloud: 9%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
19:00

SE
SE

 4 / 5 mph 44 / 42°F 56% 1016 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 1%
Most Significant Cloud Type: medium
27%
0.0 In
Tue 26
Nov		01:00

WNW
WNW

 4 / 5 mph 42 / 40°F 73% 1017 mb
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

ESE
ESE

 5 / 7 mph 39 / 35°F 94% 1010 mb
Low level cloud: 100%
Mid level cloud: 65%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

NE
NE

 4 / 5 mph 44 / 42°F 64% 1016 mb
Low level cloud: 99%
Mid level cloud: 21%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.0 In
19:00

N
N

 7 / 9 mph 43 / 39°F 98% 1005 mb
Low level cloud: 100%
Mid level cloud: 87%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.4 In
Wed 27
Nov		01:00

NE
NE

 5 / 10 mph 33 / 28°F 96% 1015 mb
Low level cloud: 93%
Mid level cloud: 98%
High level cloud: 21%
Most Significant Cloud Type: low
100%
0.0 In
07:00

NNW
NNW

 6 / 11 mph 37 / 32°F 96% 1007 mb
Low level cloud: 100%
Mid level cloud: 88%
High level cloud: 91%
Most Significant Cloud Type: low
100%
0.2 In
13:00

NNE
NNE

 10 / 14 mph 37 / 30°F 94% 1015 mb
Low level cloud: 90%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.1 In
19:00

NW
NW

 6 / 7 mph 40 / 36°F 97% 1012 mb
Low level cloud: 88%
Mid level cloud: 98%
High level cloud: 79%
Most Significant Cloud Type: low
100%
0.3 In
Thu 28
Nov		01:00

N
N

 10 / 15 mph 31 / 23°F 79% 1017 mb
Low level cloud: 28%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
07:00

WNW
WNW

 8 / 11 mph 33 / 26°F 82% 1013 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 10%
Most Significant Cloud Type: medium
17%
0.0 In
13:00

NNW
NNW

 8 / 11 mph 42 / 37°F 43% 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 35 / 29°F 81% 1012 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 24%
Most Significant Cloud Type: medium
10%
0.0 In
Fri 29
Nov		01:00

NW
NW

 9 / 12 mph 31 / 23°F 57% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

NNW
NNW

 5 / 6 mph 31 / 26°F 69% 1010 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 95%
Most Significant Cloud Type: medium
30%
0.0 In
13:00

NW
NW

 11 / 16 mph 40 / 33°F 45% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
19:00

NNW
NNW

 8 / 11 mph 32 / 25°F 70% 1012 mb
Low level cloud: 15%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
25%
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