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Spencer 14 Day Long Range Forecast

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

Massachusetts, United States Of America

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

The outlook for Spencer in the two weeks ahead shows the average daytime maximum temperature will be around 2°C, with a high for the two weeks of 7°C expected on the morning of Thursday 27th. The average minimum temperature will be -6°C, dipping to its lowest on the morning of Saturday 1st at -13°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain or snow. Current predictions suggest Thursday 27th will have the most precipitation with an accumulation of around 5.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 23
Feb		01:00

SW
SW

 6 / 12 mph 24 / 17°F 88% 1019 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
04:00

WSW
WSW

 7 / 13 mph 25 / 17°F 89% 1018 mb
Low level cloud: 0%
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
07:00

W
W

 8 / 14 mph 25 / 16°F 88% 1018 mb
Low level cloud: 24%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 11 / 14 mph 31 / 22°F 78% 1018 mb
Low level cloud: 89%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 11 / 15 mph 33 / 24°F 83% 1017 mb
Low level cloud: 87%
Mid level cloud: 10%
High level cloud: 4%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 8 / 11 mph 33 / 26°F 84% 1017 mb
Low level cloud: 32%
Mid level cloud: 18%
High level cloud: 33%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 4 / 7 mph 28 / 24°F 96% 1019 mb
Low level cloud: 1%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 5 / 9 mph 27 / 21°F 94% 1020 mb
Low level cloud: 0%
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
Mon 24
Feb		19:00

SSW
SSW

 10 / 16 mph 33 / 25°F 86% 1014 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 11 / 19 mph 34 / 25°F 81% 1013 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 99%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 25
Feb		01:00

SW
SW

 11 / 19 mph 35 / 26°F 84% 1012 mb
Low level cloud: 1%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 9 / 16 mph 35 / 28°F 90% 1010 mb
Low level cloud: 12%
Mid level cloud: 91%
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

SW
SW

 5 / 9 mph 35 / 30°F 94% 1010 mb
Low level cloud: 13%
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
10:00

SSW
SSW

 5 / 8 mph 38 / 34°F 91% 1009 mb
Low level cloud: 11%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 6 / 8 mph 42 / 39°F 85% 1007 mb
Low level cloud: 10%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 6 / 9 mph 42 / 39°F 92% 1005 mb
Low level cloud: 17%
Mid level cloud: 100%
High level cloud: 96%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 6 / 11 mph 39 / 34°F 96% 1005 mb
Low level cloud: 83%
Mid level cloud: 79%
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

W
W

 9 / 13 mph 36 / 30°F 98% 1004 mb
Low level cloud: 97%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 26
Feb		01:00

WNW
WNW

 11 / 17 mph 35 / 27°F 91% 1004 mb
Low level cloud: 95%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 13 / 20 mph 34 / 25°F 87% 1005 mb
Low level cloud: 100%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 12 / 19 mph 34 / 26°F 82% 1007 mb
Low level cloud: 83%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

 12 / 15 mph 38 / 30°F 81% 1009 mb
Low level cloud: 64%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 11 / 15 mph 40 / 33°F 73% 1010 mb
Low level cloud: 43%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 9 / 12 mph 39 / 33°F 81% 1012 mb
Low level cloud: 16%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 6 / 10 mph 33 / 27°F 91% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 4 / 8 mph 31 / 27°F 92% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 97%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 27
Feb		01:00

SSW
SSW

 3 / 6 mph 32 / 29°F 91% 1014 mb
Low level cloud: 0%
Mid level cloud: 83%
High level cloud: 79%
Most Significant Cloud Type: medium
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 4 / 8 mph 33 / 29°F 91% 1012 mb
Low level cloud: 35%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 11 / 18 mph 38 / 31°F 94% 1008 mb
Low level cloud: 99%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 14 / 22 mph 44 / 37°F 91% 1005 mb
Low level cloud: 98%
Mid level cloud: 89%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 11 / 18 mph 44 / 38°F 96% 1002 mb
Low level cloud: 100%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 8 / 13 mph 44 / 39°F 97% 1000 mb
Low level cloud: 98%
Mid level cloud: 75%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 5 / 8 mph 42 / 39°F 99% 999 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 4 / 8 mph 41 / 39°F 99% 997 mb
Low level cloud: 85%
Mid level cloud: 99%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Fri 28
Feb		01:00

WSW
WSW

 6 / 10 mph 41 / 37°F 97% 994 mb
Low level cloud: 87%
Mid level cloud: 63%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

WNW
WNW

 8 / 12 mph 37 / 30°F 97% 993 mb
Low level cloud: 93%
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
07:00

WNW
WNW

 13 / 19 mph 31 / 22°F 87% 993 mb
Low level cloud: 95%
Mid level cloud: 17%
High level cloud: 60%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

 15 / 17 mph 35 / 25°F 76% 995 mb
Low level cloud: 32%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 18 / 21 mph 30 / 18°F 69% 997 mb
Low level cloud: 10%
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
16:00

WNW
WNW

 17 / 21 mph 22 / 8°F 67% 1003 mb
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 15 / 21 mph 14 / -2°F 66% 1009 mb
Low level cloud: 4%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 12 / 16 mph 10 / -6°F 60% 1014 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 01
Mar		01:00

WNW
WNW

 9 / 12 mph 10 / -3°F 47% 1017 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 4 / 6 mph 11 / 3°F 42% 1018 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 30%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 3 / 4 mph 12 / 6°F 42% 1019 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 19%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 4 / 4 mph 18 / 12°F 44% 1020 mb
Low level cloud: 59%
Mid level cloud: 97%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 7 / 9 mph 19 / 10°F 77% 1019 mb
Low level cloud: 95%
Mid level cloud: 69%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

 9 / 12 mph 19 / 8°F 84% 1018 mb
Low level cloud: 94%
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
19:00

ENE
ENE

 7 / 9 mph 18 / 8°F 90% 1020 mb
Low level cloud: 66%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 6 / 8 mph 17 / 9°F 89% 1020 mb
Low level cloud: 50%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 02
Mar		01:00

SW
SW

 14 / 25 mph 36 / 27°F 92% 1008 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
07:00

W
W

 13 / 20 mph 33 / 23°F 88% 1004 mb
Low level cloud: 25%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.0 In
13:00

WNW
WNW

 18 / 22 mph 29 / 16°F 58% 1007 mb
Low level cloud: 14%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.0 In
19:00

WNW
WNW

 14 / 21 mph 21 / 8°F 71% 1014 mb
Low level cloud: 83%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In
Mon 03
Mar		01:00

WNW
WNW

 12 / 18 mph 14 / 0°F 71% 1019 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
11%
0.0 In
07:00

NW
NW

 11 / 16 mph 10 / -5°F 56% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
13:00

WNW
WNW

 10 / 12 mph 28 / 19°F 39% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
19:00

WNW
WNW

 5 / 6 mph 30 / 25°F 72% 1022 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 32%
Most Significant Cloud Type: high
32%
0.0 In
Tue 04
Mar		01:00

SW
SW

 13 / 28 mph 28 / 17°F 91% 1008 mb
Low level cloud: 96%
Mid level cloud: 19%
High level cloud: 4%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SW
SW

 8 / 11 mph 24 / 16°F 59% 1018 mb
Low level cloud: 0%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

NW
NW

 11 / 15 mph 34 / 25°F 46% 1011 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 7%
Most Significant Cloud Type: medium
2%
0.0 In
19:00

SW
SW

 7 / 13 mph 36 / 29°F 68% 1013 mb
Low level cloud: 28%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Wed 05
Mar		01:00

NE
NE

 3 / 4 mph 26 / 22°F 60% 1021 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
14%
0.0 In
07:00

SW
SW

 5 / 8 mph 37 / 33°F 94% 1010 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.0 In
13:00

S
S

 6 / 9 mph 32 / 26°F 69% 1016 mb
Low level cloud: 74%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

NW
NW

 2 / 3 mph 41 / 40°F 96% 1010 mb
Low level cloud: 82%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
Thu 06
Mar		01:00

ESE
ESE

 1 / 2 mph 38 / 38°F 100% 999 mb
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 45%
Most Significant Cloud Type: low
100%
0.7 In
07:00

E
E

 9 / 14 mph 35 / 28°F 98% 1000 mb
Low level cloud: 100%
Mid level cloud: 88%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.7 In
13:00

SW
SW

 9 / 15 mph 48 / 44°F 99% 980 mb
Low level cloud: 96%
Mid level cloud: 29%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.4 In
19:00

WSW
WSW

 10 / 16 mph 46 / 42°F 97% 979 mb
Low level cloud: 100%
Mid level cloud: 81%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.8 In
Fri 07
Mar		01:00

WNW
WNW

 18 / 27 mph 21 / 7°F 76% 995 mb
Low level cloud: 38%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.1 In
07:00

WNW
WNW

 18 / 27 mph 19 / 4°F 68% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.1 In
13:00

W
W

 20 / 31 mph 19 / 2°F 50% 1003 mb
Low level cloud: 1%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
0.0 In
19:00

W
W

 13 / 20 mph 34 / 24°F 71% 1010 mb
Low level cloud: 38%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: low
53%
0.0 In
Sat 08
Mar		01:00

WNW
WNW

 12 / 18 mph 10 / -4°F 70% 1010 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

W
W

 8 / 11 mph 30 / 22°F 81% 1011 mb
Low level cloud: 93%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
13:00

WNW
WNW

 14 / 22 mph 17 / 3°F 48% 1015 mb
Low level cloud: 98%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
19:00

WNW
WNW

 10 / 16 mph 24 / 14°F 66% 1016 mb
Low level cloud: 18%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.0 In
Sun 09
Mar		01:00

ESE
ESE

 2 / 3 mph 18 / 16°F 65% 1018 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

WNW
WNW

 10 / 13 mph 16 / 4°F 56% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NNE
NNE

 13 / 20 mph 19 / 6°F 84% 1013 mb
Low level cloud: 98%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
19:00

NNE
NNE

 4 / 5 mph 23 / 18°F 62% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
Mon 10
Mar		01:00

NW
NW

 6 / 9 mph 18 / 10°F 90% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NE
NE

 8 / 11 mph 16 / 6°F 79% 1024 mb
Low level cloud: 35%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
82%
0.0 In
13:00

NW
NW

 4 / 7 mph 34 / 30°F 51% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

ENE
ENE

 7 / 9 mph 24 / 16°F 94% 1023 mb
Low level cloud: 69%
Mid level cloud: 86%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.2 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