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Worcester 14 Day Long Range Forecast

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

Massachusetts, United States Of America

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

Reviewing the forecast for Worcester Over the next 14 days and the average daytime maximum temperature will be around 6°C, with a high for the two weeks of 13°C expected on the afternoon of Saturday 8th. The mean minimum temperature will be 0°C, dipping to its lowest on the morning of Sunday 16th at -6°C. Expect the coming 14 days to have some days seeing a little precipitation and some days with rain or snow. It looks like Monday 10th will have the most precipitation with an accumulation of around 10.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 06
Nov		01:00

W
W

 19 / 30 mph 43 / 35°F 82% 997 mb
Low level cloud: 95%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

WNW
WNW

 17 / 28 mph 39 / 29°F 79% 1005 mb
Low level cloud: 53%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 15 / 24 mph 39 / 30°F 72% 1009 mb
Low level cloud: 65%
Mid level cloud: 9%
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

WNW
WNW

 14 / 19 mph 43 / 36°F 62% 1012 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 13 / 19 mph 44 / 37°F 54% 1013 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 11 / 18 mph 42 / 35°F 53% 1016 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 7 / 10 mph 38 / 33°F 67% 1019 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
22:00

W
W

 7 / 11 mph 34 / 28°F 72% 1020 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
Fri 07
Nov		19:00

SSW
SSW

 16 / 27 mph 49 / 43°F 73% 1007 mb
Low level cloud: 28%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 14 / 23 mph 51 / 47°F 84% 1006 mb
Low level cloud: 94%
Mid level cloud: 70%
High level cloud: 36%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 08
Nov		01:00

SW
SW

 12 / 20 mph 51 / 46°F 94% 1004 mb
Low level cloud: 96%
Mid level cloud: 92%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
04:00

SW
SW

 10 / 17 mph 51 / 47°F 96% 1003 mb
Low level cloud: 99%
Mid level cloud: 87%
High level cloud: 47%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

WSW
WSW

 9 / 15 mph 52 / 48°F 95% 1004 mb
Low level cloud: 88%
Mid level cloud: 20%
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

W
W

 9 / 14 mph 56 / 53°F 80% 1006 mb
Low level cloud: 21%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 11 / 15 mph 56 / 53°F 56% 1007 mb
Low level cloud: 56%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 8 / 11 mph 53 / 50°F 67% 1010 mb
Low level cloud: 3%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 6 / 9 mph 48 / 45°F 79% 1013 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

WNW
WNW

 5 / 7 mph 44 / 40°F 80% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 09
Nov		01:00

WNW
WNW

 2 / 3 mph 41 / 41°F 77% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 1 / 2 mph 40 / 40°F 78% 1016 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

E
E

 2 / 3 mph 40 / 40°F 79% 1017 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 5 / 8 mph 46 / 43°F 62% 1016 mb
Low level cloud: 0%
Mid level cloud: 97%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SE
SE

 8 / 13 mph 51 / 48°F 61% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 8 / 12 mph 50 / 47°F 78% 1011 mb
Low level cloud: 25%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

 6 / 9 mph 49 / 47°F 88% 1011 mb
Low level cloud: 99%
Mid level cloud: 46%
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

 4 / 7 mph 48 / 46°F 98% 1009 mb
Low level cloud: 100%
Mid level cloud: 19%
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 10
Nov		01:00

N
N

 5 / 8 mph 47 / 45°F 99% 1008 mb
Low level cloud: 88%
Mid level cloud: 56%
High level cloud: 93%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 4 / 7 mph 47 / 46°F 99% 1005 mb
Low level cloud: 95%
Mid level cloud: 69%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
07:00

WNW
WNW

 7 / 11 mph 47 / 43°F 98% 1004 mb
Low level cloud: 95%
Mid level cloud: 97%
High level cloud: 95%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

W
W

 5 / 7 mph 46 / 43°F 95% 1004 mb
Low level cloud: 56%
Mid level cloud: 93%
High level cloud: 5%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 9 / 13 mph 43 / 37°F 87% 1005 mb
Low level cloud: 83%
Mid level cloud: 76%
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

WNW
WNW

 10 / 16 mph 39 / 32°F 84% 1007 mb
Low level cloud: 16%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 10 / 15 mph 36 / 28°F 80% 1010 mb
Low level cloud: 8%
Mid level cloud: 11%
High level cloud: 79%
Most Significant Cloud Type: medium
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 9 / 10 mph 35 / 28°F 76% 1010 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
Tue 11
Nov		01:00

W
W

 9 / 11 mph 31 / 23°F 76% 1011 mb
Low level cloud: 2%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

 8 / 13 mph 28 / 20°F 80% 1013 mb
Low level cloud: 28%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 11 / 16 mph 27 / 18°F 71% 1014 mb
Low level cloud: 23%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 13 / 18 mph 33 / 23°F 48% 1015 mb
Low level cloud: 62%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

 14 / 19 mph 39 / 31°F 40% 1014 mb
Low level cloud: 0%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: medium
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 11 / 17 mph 39 / 32°F 51% 1014 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 10 / 13 mph 37 / 31°F 63% 1016 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
22:00

SW
SW

 11 / 18 mph 35 / 27°F 63% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 10%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 12
Nov		01:00

SW
SW

 11 / 19 mph 35 / 26°F 54% 1013 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 12 / 19 mph 37 / 29°F 57% 1010 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 12 / 21 mph 39 / 31°F 57% 1008 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
10:00

SW
SW

 13 / 19 mph 42 / 35°F 50% 1006 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 12 / 17 mph 46 / 40°F 52% 1004 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 11 / 18 mph 44 / 38°F 64% 1004 mb
Low level cloud: 0%
Mid level cloud: 84%
High level cloud: 0%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SW
SW

 9 / 15 mph 42 / 37°F 75% 1005 mb
Low level cloud: 41%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

 10 / 18 mph 42 / 36°F 79% 1005 mb
Low level cloud: 27%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 13
Nov		01:00

WSW
WSW

 9 / 15 mph 39 / 33°F 84% 1001 mb
Low level cloud: 81%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
07:00

W
W

 10 / 21 mph 35 / 27°F 90% 1006 mb
Low level cloud: 92%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
13:00

W
W

 14 / 22 mph 43 / 36°F 58% 1007 mb
Low level cloud: 41%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
19:00

W
W

 6 / 8 mph 49 / 47°F 90% 1012 mb
Low level cloud: 13%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
Fri 14
Nov		01:00

WNW
WNW

 6 / 9 mph 37 / 32°F 95% 1010 mb
Low level cloud: 37%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
42%
0.0 In
07:00

WNW
WNW

 7 / 10 mph 35 / 29°F 81% 1007 mb
Low level cloud: 91%
Mid level cloud: 80%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NW
NW

 14 / 18 mph 38 / 29°F 48% 1006 mb
Low level cloud: 6%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
19:00

WNW
WNW

 7 / 10 mph 33 / 27°F 69% 1011 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 41%
Most Significant Cloud Type: medium
31%
0.0 In
Sat 15
Nov		01:00

WNW
WNW

 10 / 14 mph 24 / 13°F 51% 1012 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 98%
Most Significant Cloud Type: medium
11%
0.0 In
07:00

SW
SW

 11 / 18 mph 34 / 26°F 94% 1002 mb
Low level cloud: 100%
Mid level cloud: 48%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

WSW
WSW

 3 / 4 mph 30 / 27°F 79% 1005 mb
Low level cloud: 85%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

W
W

 8 / 12 mph 39 / 33°F 87% 999 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
0.0 In
Sun 16
Nov		01:00

NNW
NNW

 6 / 7 mph 28 / 22°F 68% 1005 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.1 In
07:00

ESE
ESE

 3 / 4 mph 37 / 35°F 88% 1001 mb
Low level cloud: 17%
Mid level cloud: 82%
High level cloud: 5%
Most Significant Cloud Type: medium
100%
0.0 In
13:00

NW
NW

 7 / 9 mph 37 / 31°F 38% 1006 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 14%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

S
S

 11 / 17 mph 53 / 50°F 95% 990 mb
Low level cloud: 98%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Mon 17
Nov		01:00

NW
NW

 2 / 2 mph 30 / 30°F 63% 1007 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

WSW
WSW

 9 / 15 mph 47 / 43°F 94% 986 mb
Low level cloud: 85%
Mid level cloud: 66%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.7 In
13:00

NNW
NNW

 6 / 8 mph 39 / 35°F 38% 1004 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
19:00

W
W

 12 / 19 mph 34 / 26°F 84% 997 mb
Low level cloud: 59%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
63%
0.0 In
Tue 18
Nov		01:00

WNW
WNW

 6 / 8 mph 28 / 21°F 74% 1012 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

WNW
WNW

 13 / 21 mph 28 / 17°F 70% 1007 mb
Low level cloud: 1%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
0.0 In
13:00

NW
NW

 10 / 15 mph 35 / 27°F 41% 1015 mb
Low level cloud: 3%
Mid level cloud: 78%
High level cloud: 0%
Most Significant Cloud Type: medium
87%
0.0 In
19:00

WNW
WNW

 11 / 18 mph 29 / 19°F 73% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
Wed 19
Nov		01:00

NW
NW

 7 / 9 mph 28 / 20°F 69% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

W
W

 3 / 5 mph 33 / 30°F 72% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 16%
Most Significant Cloud Type: medium
4%
0.0 In
13:00

NNW
NNW

 11 / 16 mph 34 / 26°F 38% 1021 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

 4 / 6 mph 39 / 36°F 55% 1025 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 75%
Most Significant Cloud Type: medium
56%
0.0 In
Thu 20
Nov		01:00

NW
NW

 6 / 8 mph 29 / 22°F 68% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

SSW
SSW

 2 / 3 mph 40 / 39°F 82% 1026 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 22%
Most Significant Cloud Type: medium
28%
0.0 In
13:00

WNW
WNW

 7 / 9 mph 40 / 35°F 34% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
0.0 In
19:00

WSW
WSW

 1 / 1 mph 51 / 51°F 87% 1025 mb
Low level cloud: 14%
Mid level cloud: 11%
High level cloud: 50%
Most Significant Cloud Type: low
23%
0.0 In
Fri 21
Nov		01:00

WNW
WNW

 3 / 4 mph 35 / 33°F 60% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 96%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

NNE
NNE

 0 / 1 mph 44 / 44°F 91% 1024 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
13:00

W
W

 6 / 7 mph 46 / 44°F 35% 1020 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
19:00

S
S

 4 / 6 mph 53 / 52°F 93% 1019 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 13%
Most Significant Cloud Type: medium
22%
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