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Wilbraham 14 Day Long Range Forecast

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

Massachusetts, United States Of America

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

The next 14 day outlook for Wilbraham shows the average daytime maximum temperature will be around 20°C, with a high for the two weeks of 27°C expected on the afternoon of Tuesday 14th. The average minimum temperature will be 9°C, dipping to its lowest on the morning of Thursday 23rd at 5°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Current predictions suggest Thursday 16th will have the most precipitation with an accumulation of around 3.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 14
May		16:00

S
S

 12 / 14 mph 78 / 78°F 50% 1012 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 3%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 8 / 14 mph 66 / 64°F 78% 1013 mb
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 4 / 9 mph 57 / 57°F 94% 1014 mb
Low level cloud: 10%
Mid level cloud: 24%
High level cloud: 15%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 15
May		01:00

S
S

 4 / 6 mph 58 / 58°F 93% 1013 mb
Low level cloud: 29%
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

S
S

 4 / 7 mph 57 / 56°F 98% 1013 mb
Low level cloud: 71%
Mid level cloud: 94%
High level cloud: 45%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 3 / 6 mph 57 / 57°F 97% 1013 mb
Low level cloud: 39%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 4 / 6 mph 60 / 60°F 94% 1013 mb
Low level cloud: 52%
Mid level cloud: 94%
High level cloud: 80%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 3 / 4 mph 63 / 62°F 92% 1012 mb
Low level cloud: 12%
Mid level cloud: 75%
High level cloud: 39%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 3 / 3 mph 63 / 63°F 94% 1012 mb
Low level cloud: 20%
Mid level cloud: 97%
High level cloud: 38%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 2 / 3 mph 62 / 62°F 96% 1012 mb
Low level cloud: 11%
Mid level cloud: 69%
High level cloud: 90%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

 3 / 4 mph 60 / 60°F 97% 1012 mb
Low level cloud: 24%
Mid level cloud: 44%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May		01:00

ENE
ENE

 4 / 7 mph 56 / 55°F 98% 1011 mb
Low level cloud: 28%
Mid level cloud: 44%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 5 / 9 mph 55 / 54°F 97% 1011 mb
Low level cloud: 93%
Mid level cloud: 90%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

 7 / 11 mph 57 / 55°F 96% 1012 mb
Low level cloud: 98%
Mid level cloud: 49%
High level cloud: 57%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

ENE
ENE

 9 / 11 mph 61 / 60°F 88% 1012 mb
Low level cloud: 71%
Mid level cloud: 49%
High level cloud: 66%
Most Significant Cloud Type: low
95%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

E
E

 9 / 10 mph 61 / 61°F 76% 1013 mb
Low level cloud: 25%
Mid level cloud: 82%
High level cloud: 43%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

 6 / 8 mph 64 / 61°F 72% 1013 mb
Low level cloud: 0%
Mid level cloud: 68%
High level cloud: 34%
Most Significant Cloud Type: medium
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 5 / 9 mph 59 / 56°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 5 / 10 mph 52 / 50°F 91% 1015 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May		01:00

NNE
NNE

 4 / 8 mph 54 / 54°F 83% 1015 mb
Low level cloud: 0%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: medium
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 5 / 8 mph 54 / 54°F 87% 1015 mb
Low level cloud: 3%
Mid level cloud: 76%
High level cloud: 1%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 7 / 9 mph 63 / 60°F 77% 1016 mb
Low level cloud: 25%
Mid level cloud: 67%
High level cloud: 9%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 7 / 8 mph 71 / 69°F 56% 1017 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 9 / 11 mph 76 / 77°F 48% 1015 mb
Low level cloud: 35%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 7 / 9 mph 75 / 76°F 54% 1016 mb
Low level cloud: 54%
Mid level cloud: 24%
High level cloud: 4%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 6 / 11 mph 64 / 61°F 79% 1016 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

 4 / 8 mph 56 / 56°F 90% 1017 mb
Low level cloud: 3%
Mid level cloud: 46%
High level cloud: 99%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		01:00

NE
NE

 3 / 5 mph 51 / 51°F 97% 1018 mb
Low level cloud: 19%
Mid level cloud: 28%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

 3 / 6 mph 48 / 48°F 97% 1018 mb
Low level cloud: 19%
Mid level cloud: 31%
High level cloud: 28%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

 4 / 5 mph 59 / 57°F 74% 1018 mb
Low level cloud: 0%
Mid level cloud: 47%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

E
E

 6 / 6 mph 68 / 65°F 60% 1018 mb
Low level cloud: 38%
Mid level cloud: 48%
High level cloud: 92%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 5 / 6 mph 68 / 66°F 60% 1017 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 99%
Most Significant Cloud Type: medium
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 5 / 7 mph 63 / 61°F 86% 1016 mb
Low level cloud: 7%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: medium
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 5 / 8 mph 57 / 55°F 90% 1016 mb
Low level cloud: 33%
Mid level cloud: 75%
High level cloud: 100%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

 5 / 7 mph 52 / 50°F 90% 1016 mb
Low level cloud: 24%
Mid level cloud: 92%
High level cloud: 64%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		01:00

ENE
ENE

 4 / 5 mph 51 / 49°F 91% 1015 mb
Low level cloud: 44%
Mid level cloud: 59%
High level cloud: 32%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 6 / 7 mph 50 / 47°F 90% 1014 mb
Low level cloud: 85%
Mid level cloud: 80%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

 7 / 9 mph 51 / 49°F 86% 1014 mb
Low level cloud: 95%
Mid level cloud: 71%
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

ENE
ENE

 9 / 10 mph 54 / 51°F 81% 1013 mb
Low level cloud: 84%
Mid level cloud: 74%
High level cloud: 65%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 9 / 11 mph 55 / 53°F 76% 1011 mb
Low level cloud: 95%
Mid level cloud: 74%
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

ENE
ENE

 8 / 12 mph 54 / 51°F 83% 1011 mb
Low level cloud: 79%
Mid level cloud: 90%
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

NE
NE

 10 / 14 mph 49 / 45°F 90% 1012 mb
Low level cloud: 86%
Mid level cloud: 92%
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

NNE
NNE

 10 / 14 mph 48 / 43°F 95% 1012 mb
Low level cloud: 99%
Mid level cloud: 81%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

NNE
NNE

 10 / 14 mph 47 / 43°F 96% 1011 mb
Low level cloud: 99%
Mid level cloud: 48%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 10 / 14 mph 48 / 44°F 95% 1011 mb
Low level cloud: 97%
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
07:00

NNE
NNE

 10 / 13 mph 51 / 47°F 89% 1012 mb
Low level cloud: 96%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 12 / 14 mph 56 / 52°F 75% 1012 mb
Low level cloud: 90%
Mid level cloud: 13%
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

NE
NE

 12 / 13 mph 60 / 59°F 65% 1011 mb
Low level cloud: 88%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 9 / 10 mph 61 / 60°F 66% 1011 mb
Low level cloud: 82%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 5 / 8 mph 55 / 52°F 86% 1012 mb
Low level cloud: 8%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 4 / 7 mph 47 / 46°F 96% 1013 mb
Low level cloud: 13%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 21
May		01:00

NW
NW

 2 / 4 mph 48 / 48°F 75% 1020 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 14%
Most Significant Cloud Type: medium
10%
0.0 In
07:00

NNE
NNE

 2 / 4 mph 51 / 52°F 99% 1005 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
19:00

S
S

 3 / 5 mph 66 / 66°F 98% 1007 mb
Low level cloud: 13%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Wed 22
May		01:00

SSE
SSE

 4 / 7 mph 63 / 63°F 74% 1006 mb
Low level cloud: 0%
Mid level cloud: 84%
High level cloud: 0%
Most Significant Cloud Type: medium
84%
0.0 In
07:00

NNE
NNE

 4 / 6 mph 61 / 61°F 87% 1015 mb
Low level cloud: 82%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
86%
0.0 In
13:00

SSW
SSW

 7 / 12 mph 82 / 82°F 43% 1009 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
19:00

ESE
ESE

 4 / 6 mph 58 / 58°F 72% 1025 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
Thu 23
May		01:00

S
S

 8 / 12 mph 60 / 60°F 88% 1008 mb
Low level cloud: 26%
Mid level cloud: 44%
High level cloud: 79%
Most Significant Cloud Type: low
51%
0.0 In
07:00

NE
NE

 2 / 3 mph 59 / 60°F 57% 1027 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

SSW
SSW

 10 / 17 mph 80 / 82°F 57% 1004 mb
Low level cloud: 17%
Mid level cloud: 10%
High level cloud: 18%
Most Significant Cloud Type: low
22%
0.0 In
19:00

SSE
SSE

 7 / 13 mph 58 / 57°F 68% 1022 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.0 In
Fri 24
May		01:00

SW
SW

 5 / 10 mph 65 / 65°F 99% 999 mb
Low level cloud: 96%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.4 In
07:00

SSW
SSW

 2 / 3 mph 61 / 61°F 67% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

W
W

 8 / 16 mph 76 / 78°F 58% 1001 mb
Low level cloud: 50%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: low
71%
0.0 In
19:00

S
S

 8 / 12 mph 59 / 57°F 64% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
0.0 In
Sat 25
May		01:00

N
N

 4 / 9 mph 57 / 57°F 83% 1008 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 15%
Most Significant Cloud Type: medium
18%
0.0 In
07:00

SSE
SSE

 2 / 2 mph 55 / 55°F 56% 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

SSE
SSE

 2 / 3 mph 73 / 76°F 48% 1009 mb
Low level cloud: 15%
Mid level cloud: 55%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
19:00

WSW
WSW

 3 / 5 mph 55 / 55°F 64% 1018 mb
Low level cloud: 42%
Mid level cloud: 96%
High level cloud: 95%
Most Significant Cloud Type: low
86%
0.0 In
Sun 26
May		01:00

S
S

 1 / 2 mph 60 / 60°F 98% 1012 mb
Low level cloud: 52%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
07:00

SSE
SSE

 2 / 3 mph 56 / 57°F 68% 1017 mb
Low level cloud: 80%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
13:00

NE
NE

 3 / 6 mph 61 / 61°F 87% 1015 mb
Low level cloud: 47%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.1 In
19:00

S
S

 6 / 10 mph 62 / 62°F 85% 1015 mb
Low level cloud: 77%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
Mon 27
May		01:00

SSW
SSW

 2 / 4 mph 55 / 57°F 93% 1017 mb
Low level cloud: 39%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
73%
0.0 In
07:00

SE
SE

 2 / 3 mph 64 / 64°F 85% 1016 mb
Low level cloud: 81%
Mid level cloud: 46%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.0 In
13:00

WSW
WSW

 3 / 7 mph 68 / 68°F 76% 1017 mb
Low level cloud: 47%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
53%
0.1 In
19:00

NNE
NNE

 2 / 3 mph 65 / 65°F 97% 1015 mb
Low level cloud: 95%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In
Tue 28
May		01:00

N
N

 3 / 6 mph 55 / 55°F 96% 1020 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.2 In
07:00

N
N

 3 / 6 mph 62 / 62°F 98% 1016 mb
Low level cloud: 89%
Mid level cloud: 18%
High level cloud: 3%
Most Significant Cloud Type: low
95%
0.1 In
13:00

NW
NW

 2 / 5 mph 81 / 80°F 33% 1020 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
19:00

ENE
ENE

 6 / 11 mph 60 / 60°F 88% 1015 mb
Low level cloud: 71%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.1 In
Wed 29
May		01:00

SSE
SSE

 3 / 7 mph 56 / 56°F 94% 1022 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 33%
Most Significant Cloud Type: medium
11%
0.0 In
07:00

ESE
ESE

 3 / 6 mph 59 / 60°F 97% 1014 mb
Low level cloud: 98%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

SSE
SSE

 10 / 20 mph 57 / 54°F 98% 1014 mb
Low level cloud: 99%
Mid level cloud: 87%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
19:00

ESE
ESE

 9 / 17 mph 58 / 57°F 98% 1009 mb
Low level cloud: 76%
Mid level cloud: 98%
High level cloud: 80%
Most Significant Cloud Type: low
100%
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