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Boxborough 14 Day Long Range Forecast

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

Massachusetts, United States Of America

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

Over the next 14 days the Boxborough forecast suggests the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 20°C expected on the afternoon of Sunday 19th. The average minimum temperature will be 8°C, dipping to its lowest on the morning of Thursday 16th at 3°C. The next 14 days will have some days seeing a little precipitation and some days with rain. The current forecast indicates Tuesday 21st will have the most precipitation with an accumulation of around 60.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 12
Oct		01:00

NNE
NNE

 4 / 7 mph 52 / 51°F 98% 1024 mb
Low level cloud: 55%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 6 / 12 mph 50 / 48°F 99% 1023 mb
Low level cloud: 95%
Mid level cloud: 58%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 9 / 18 mph 50 / 47°F 90% 1023 mb
Low level cloud: 97%
Mid level cloud: 87%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 10 / 12 mph 55 / 53°F 82% 1024 mb
Low level cloud: 100%
Mid level cloud: 64%
High level cloud: 64%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 11 / 13 mph 57 / 55°F 93% 1023 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 87%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 11 / 13 mph 58 / 55°F 95% 1022 mb
Low level cloud: 100%
Mid level cloud: 11%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 13 / 15 mph 56 / 53°F 94% 1023 mb
Low level cloud: 100%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 13 / 17 mph 55 / 51°F 93% 1022 mb
Low level cloud: 100%
Mid level cloud: 82%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 13
Oct		19:00

NE
NE

 12 / 14 mph 53 / 50°F 97% 1022 mb
Low level cloud: 100%
Mid level cloud: 98%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

NE
NE

 11 / 15 mph 52 / 49°F 97% 1022 mb
Low level cloud: 100%
Mid level cloud: 90%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Tue 14
Oct		01:00

NNE
NNE

 11 / 17 mph 50 / 46°F 97% 1021 mb
Low level cloud: 100%
Mid level cloud: 95%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

NNE
NNE

 11 / 17 mph 49 / 44°F 97% 1021 mb
Low level cloud: 100%
Mid level cloud: 73%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 10 / 13 mph 48 / 44°F 96% 1021 mb
Low level cloud: 99%
Mid level cloud: 71%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 8 / 9 mph 52 / 49°F 90% 1021 mb
Low level cloud: 93%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNE
NNE

 6 / 8 mph 55 / 52°F 73% 1019 mb
Low level cloud: 51%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 4 / 6 mph 56 / 54°F 67% 1018 mb
Low level cloud: 54%
Mid level cloud: 47%
High level cloud: 0%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 3 / 4 mph 54 / 54°F 79% 1017 mb
Low level cloud: 22%
Mid level cloud: 87%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

 3 / 5 mph 52 / 52°F 95% 1016 mb
Low level cloud: 6%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 15
Oct		01:00

NW
NW

 3 / 6 mph 50 / 50°F 96% 1015 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 12%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 3 / 6 mph 48 / 47°F 94% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 84%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 5 / 11 mph 52 / 49°F 88% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 13 / 15 mph 61 / 60°F 56% 1013 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 98%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 13 / 15 mph 57 / 53°F 52% 1012 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 13 / 16 mph 54 / 49°F 48% 1013 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
19:00

NNW
NNW

 11 / 16 mph 48 / 43°F 55% 1014 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
22:00

NNW
NNW

 9 / 13 mph 45 / 40°F 60% 1014 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
Oct		01:00

NNW
NNW

 9 / 13 mph 43 / 38°F 59% 1014 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
04:00

NNW
NNW

 11 / 17 mph 41 / 35°F 57% 1014 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
07:00

NNW
NNW

 12 / 17 mph 40 / 33°F 57% 1014 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
10:00

NNW
NNW

 13 / 15 mph 49 / 43°F 40% 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
13:00

NNW
NNW

 14 / 16 mph 54 / 49°F 32% 1012 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
16:00

NNW
NNW

 12 / 16 mph 53 / 48°F 39% 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
19:00

NNW
NNW

 13 / 19 mph 46 / 40°F 47% 1014 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
22:00

NNW
NNW

 9 / 14 mph 44 / 38°F 54% 1014 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
Fri 17
Oct		01:00

NW
NW

 6 / 11 mph 41 / 37°F 59% 1014 mb
Low level cloud: 10%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 6 / 11 mph 41 / 37°F 59% 1015 mb
Low level cloud: 57%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNW
NNW

 7 / 12 mph 44 / 39°F 58% 1017 mb
Low level cloud: 26%
Mid level cloud: 72%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 10 / 11 mph 55 / 52°F 50% 1017 mb
Low level cloud: 6%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 9 / 10 mph 60 / 59°F 42% 1016 mb
Low level cloud: 12%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

N
N

 5 / 7 mph 60 / 59°F 51% 1016 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 5 / 6 mph 55 / 54°F 71% 1017 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

 4 / 9 mph 46 / 44°F 76% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
Oct		01:00

NW
NW

 4 / 7 mph 44 / 42°F 80% 1017 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
04:00

WNW
WNW

 4 / 7 mph 42 / 40°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 3%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 3 / 5 mph 43 / 42°F 75% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 22%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 3 / 3 mph 59 / 59°F 46% 1017 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 19%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 1 / 1 mph 66 / 65°F 37% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 5%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 2 / 3 mph 64 / 63°F 51% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 6%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 3 / 6 mph 53 / 53°F 63% 1017 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 8%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 2 / 4 mph 50 / 51°F 71% 1017 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 6%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 19
Oct		01:00

SSW
SSW

 1 / 2 mph 56 / 56°F 83% 1020 mb
Low level cloud: 27%
Mid level cloud: 43%
High level cloud: 93%
Most Significant Cloud Type: low
53%
0.0 In
07:00

WNW
WNW

 2 / 4 mph 51 / 51°F 81% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

S
S

 5 / 6 mph 62 / 62°F 54% 1022 mb
Low level cloud: 87%
Mid level cloud: 55%
High level cloud: 93%
Most Significant Cloud Type: low
100%
0.0 In
19:00

E
E

 5 / 6 mph 59 / 59°F 86% 1018 mb
Low level cloud: 52%
Mid level cloud: 74%
High level cloud: 32%
Most Significant Cloud Type: low
81%
0.0 In
Mon 20
Oct		01:00

SSE
SSE

 1 / 2 mph 54 / 54°F 82% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 97%
Most Significant Cloud Type: medium
8%
0.0 In
07:00

S
S

 14 / 23 mph 64 / 64°F 96% 1009 mb
Low level cloud: 100%
Mid level cloud: 59%
High level cloud: 57%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SW
SW

 12 / 22 mph 59 / 56°F 58% 998 mb
Low level cloud: 46%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
19:00

E
E

 15 / 25 mph 57 / 53°F 98% 1009 mb
Low level cloud: 100%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Tue 21
Oct		01:00

WSW
WSW

 6 / 12 mph 50 / 47°F 92% 1000 mb
Low level cloud: 1%
Mid level cloud: 16%
High level cloud: 96%
Most Significant Cloud Type: medium
22%
0.0 In
07:00

ESE
ESE

 10 / 20 mph 58 / 56°F 98% 1008 mb
Low level cloud: 96%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
3.4 In
13:00

W
W

 10 / 19 mph 53 / 49°F 71% 1003 mb
Low level cloud: 78%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.0 In
19:00

E
E

 3 / 6 mph 63 / 63°F 95% 1012 mb
Low level cloud: 20%
Mid level cloud: 10%
High level cloud: 5%
Most Significant Cloud Type: low
24%
0.1 In
Wed 22
Oct		01:00

WNW
WNW

 7 / 14 mph 49 / 46°F 80% 1005 mb
Low level cloud: 50%
Mid level cloud: 67%
High level cloud: 0%
Most Significant Cloud Type: low
73%
0.0 In
07:00

NNE
NNE

 4 / 9 mph 54 / 53°F 96% 1015 mb
Low level cloud: 78%
Mid level cloud: 79%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNW
NNW

 10 / 19 mph 57 / 55°F 60% 1006 mb
Low level cloud: 85%
Mid level cloud: 45%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.1 In
19:00

N
N

 12 / 24 mph 54 / 50°F 95% 1012 mb
Low level cloud: 100%
Mid level cloud: 21%
High level cloud: 22%
Most Significant Cloud Type: low
100%
0.0 In
Thu 23
Oct		01:00

NNW
NNW

 4 / 7 mph 49 / 48°F 88% 1011 mb
Low level cloud: 44%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.0 In
07:00

NE
NE

 10 / 20 mph 55 / 53°F 97% 1011 mb
Low level cloud: 96%
Mid level cloud: 10%
High level cloud: 19%
Most Significant Cloud Type: low
100%
0.2 In
13:00

SSW
SSW

 4 / 8 mph 56 / 56°F 64% 1008 mb
Low level cloud: 81%
Mid level cloud: 26%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.0 In
19:00

N
N

 8 / 17 mph 60 / 60°F 97% 1010 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 44%
Most Significant Cloud Type: low
100%
0.3 In
Fri 24
Oct		01:00

S
S

 1 / 2 mph 50 / 50°F 96% 1005 mb
Low level cloud: 99%
Mid level cloud: 26%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.1 In
07:00

N
N

 6 / 13 mph 56 / 55°F 95% 1009 mb
Low level cloud: 98%
Mid level cloud: 86%
High level cloud: 70%
Most Significant Cloud Type: low
100%
0.2 In
13:00

NNW
NNW

 4 / 9 mph 50 / 49°F 96% 1004 mb
Low level cloud: 96%
Mid level cloud: 99%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.2 In
19:00

NW
NW

 5 / 11 mph 59 / 59°F 94% 1008 mb
Low level cloud: 100%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Sat 25
Oct		01:00

NNW
NNW

 9 / 17 mph 48 / 43°F 88% 1012 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
07:00

NW
NW

 9 / 18 mph 56 / 55°F 84% 1012 mb
Low level cloud: 6%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
0.0 In
13:00

NNW
NNW

 7 / 14 mph 65 / 65°F 43% 1015 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

 3 / 7 mph 60 / 60°F 83% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
0.0 In
Sun 26
Oct		01:00

WNW
WNW

 2 / 4 mph 48 / 49°F 86% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 95%
Most Significant Cloud Type: high
95%
0.0 In
07:00

SW
SW

 1 / 3 mph 52 / 52°F 89% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
13:00

S
S

 3 / 5 mph 51 / 51°F 96% 1017 mb
Low level cloud: 85%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
19:00

S
S

 4 / 9 mph 63 / 63°F 88% 1015 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: medium
19%
0.0 In
Mon 27
Oct		01:00

SSE
SSE

 4 / 7 mph 55 / 55°F 99% 1014 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
07:00

S
S

 9 / 19 mph 56 / 54°F 95% 1008 mb
Low level cloud: 98%
Mid level cloud: 98%
High level cloud: 67%
Most Significant Cloud Type: low
100%
0.1 In
13:00

S
S

 15 / 28 mph 61 / 61°F 95% 1003 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
19:00

WSW
WSW

 4 / 9 mph 57 / 57°F 94% 1001 mb
Low level cloud: 13%
Mid level cloud: 44%
High level cloud: 94%
Most Significant Cloud Type: medium
83%
0.4 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