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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:

Over the next 14 days the Worcester forecast suggests the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 29°C expected on the afternoon of Wednesday 22nd. The average minimum temperature will be 12°C, dipping to its lowest on the morning of Saturday 25th at 3°C. The next 14 days will have some days seeing a little precipitation and some days with rain. Predictions are Thursday 23rd will have the most precipitation with an accumulation of around 1.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May		01:00

NNE
NNE

 6 / 10 mph 51 / 49°F 97% 1014 mb
Low level cloud: 17%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 6 / 12 mph 50 / 47°F 95% 1014 mb
Low level cloud: 2%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 9 / 13 mph 57 / 54°F 70% 1016 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 11%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 11 / 13 mph 67 / 65°F 56% 1015 mb
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 30%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 11 / 13 mph 71 / 69°F 50% 1014 mb
Low level cloud: 30%
Mid level cloud: 30%
High level cloud: 9%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 10 / 15 mph 65 / 64°F 57% 1015 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 74%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 5 / 8 mph 57 / 55°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 19%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 5 / 7 mph 52 / 50°F 95% 1016 mb
Low level cloud: 3%
Mid level cloud: 19%
High level cloud: 32%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		19:00

NNE
NNE

 6 / 7 mph 55 / 53°F 84% 1017 mb
Low level cloud: 48%
Mid level cloud: 79%
High level cloud: 39%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 5 / 8 mph 52 / 50°F 87% 1017 mb
Low level cloud: 24%
Mid level cloud: 76%
High level cloud: 0%
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

NNE
NNE

 6 / 9 mph 50 / 48°F 91% 1017 mb
Low level cloud: 78%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 7 / 11 mph 50 / 47°F 92% 1017 mb
Low level cloud: 94%
Mid level cloud: 44%
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

 8 / 12 mph 51 / 48°F 90% 1017 mb
Low level cloud: 98%
Mid level cloud: 27%
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

 8 / 12 mph 54 / 51°F 85% 1018 mb
Low level cloud: 97%
Mid level cloud: 42%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 7 / 10 mph 61 / 61°F 69% 1017 mb
Low level cloud: 93%
Mid level cloud: 29%
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

NE
NE

 7 / 11 mph 62 / 61°F 70% 1016 mb
Low level cloud: 86%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 4 / 7 mph 60 / 58°F 92% 1017 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
22:00

NE
NE

 4 / 6 mph 51 / 50°F 99% 1018 mb
Low level cloud: 53%
Mid level cloud: 19%
High level cloud: 0%
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

 4 / 6 mph 49 / 48°F 99% 1018 mb
Low level cloud: 60%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 3 / 6 mph 48 / 47°F 99% 1018 mb
Low level cloud: 51%
Mid level cloud: 20%
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

 5 / 7 mph 56 / 53°F 85% 1018 mb
Low level cloud: 39%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 5 / 6 mph 69 / 66°F 58% 1017 mb
Low level cloud: 28%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 6 / 7 mph 76 / 76°F 49% 1016 mb
Low level cloud: 30%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 6 / 9 mph 76 / 76°F 51% 1015 mb
Low level cloud: 10%
Mid level cloud: 18%
High level cloud: 33%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 4 / 7 mph 67 / 64°F 86% 1015 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
22:00

SW
SW

 3 / 5 mph 58 / 59°F 97% 1016 mb
Low level cloud: 4%
Mid level cloud: 12%
High level cloud: 7%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		01:00

WSW
WSW

 5 / 9 mph 56 / 55°F 97% 1015 mb
Low level cloud: 3%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 4 / 7 mph 55 / 55°F 97% 1015 mb
Low level cloud: 3%
Mid level cloud: 8%
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

WSW
WSW

 4 / 6 mph 65 / 62°F 74% 1015 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
10:00

SW
SW

 6 / 7 mph 78 / 78°F 53% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 8 / 9 mph 83 / 81°F 43% 1013 mb
Low level cloud: 0%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: medium
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

 7 / 10 mph 82 / 81°F 50% 1012 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 5%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 8 / 12 mph 70 / 68°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 25%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 7 / 12 mph 63 / 63°F 85% 1014 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 7%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		01:00

SW
SW

 6 / 10 mph 62 / 62°F 88% 1014 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
04:00

WSW
WSW

 7 / 13 mph 60 / 60°F 91% 1014 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 9 / 13 mph 68 / 67°F 73% 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
10:00

SW
SW

 11 / 13 mph 78 / 78°F 50% 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
13:00

SW
SW

 11 / 13 mph 84 / 82°F 44% 1011 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 11 / 15 mph 82 / 81°F 50% 1011 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 10 / 15 mph 69 / 68°F 69% 1011 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
22:00

SW
SW

 9 / 12 mph 64 / 64°F 68% 1011 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		01:00

SW
SW

 9 / 15 mph 61 / 61°F 74% 1010 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 36%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 9 / 16 mph 61 / 60°F 87% 1009 mb
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 44%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SW
SW

 11 / 17 mph 66 / 64°F 78% 1007 mb
Low level cloud: 2%
Mid level cloud: 29%
High level cloud: 32%
Most Significant Cloud Type: medium
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 13 / 16 mph 75 / 77°F 67% 1006 mb
Low level cloud: 3%
Mid level cloud: 45%
High level cloud: 18%
Most Significant Cloud Type: medium
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 14 / 19 mph 80 / 80°F 60% 1005 mb
Low level cloud: 51%
Mid level cloud: 31%
High level cloud: 88%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 7 / 10 mph 70 / 69°F 81% 1006 mb
Low level cloud: 63%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 7 / 11 mph 70 / 67°F 72% 1007 mb
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 39%
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 / 14 mph 61 / 61°F 63% 1008 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 24
May		01:00

WNW
WNW

 5 / 7 mph 59 / 59°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

WNW
WNW

 12 / 17 mph 58 / 55°F 68% 1008 mb
Low level cloud: 51%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
60%
0.0 In
13:00

W
W

 13 / 17 mph 80 / 79°F 33% 1011 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 100%
Most Significant Cloud Type: medium
22%
0.0 In
19:00

SSW
SSW

 6 / 8 mph 75 / 78°F 70% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
Sat 25
May		01:00

NE
NE

 6 / 12 mph 49 / 46°F 87% 1019 mb
Low level cloud: 94%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

WNW
WNW

 11 / 16 mph 49 / 44°F 63% 1011 mb
Low level cloud: 33%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
13:00

WNW
WNW

 13 / 24 mph 67 / 67°F 32% 1012 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
19:00

NW
NW

 5 / 7 mph 64 / 64°F 58% 1020 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
Sun 26
May		01:00

SW
SW

 6 / 8 mph 55 / 54°F 71% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NW
NW

 4 / 5 mph 64 / 64°F 50% 1025 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: medium
2%
0.0 In
13:00

SSW
SSW

 13 / 19 mph 70 / 70°F 48% 1015 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
19:00

SSE
SSE

 6 / 8 mph 67 / 67°F 64% 1023 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
Mon 27
May		01:00

WSW
WSW

 7 / 12 mph 60 / 60°F 98% 1014 mb
Low level cloud: 76%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
07:00

SW
SW

 3 / 4 mph 60 / 60°F 64% 1019 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
0.0 In
13:00

W
W

 7 / 10 mph 79 / 79°F 35% 1014 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
19:00

S
S

 4 / 6 mph 70 / 70°F 75% 1013 mb
Low level cloud: 16%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
31%
0.0 In
Tue 28
May		01:00

ENE
ENE

 6 / 10 mph 62 / 62°F 92% 1012 mb
Low level cloud: 69%
Mid level cloud: 53%
High level cloud: 32%
Most Significant Cloud Type: low
91%
0.1 In
07:00

ENE
ENE

 3 / 4 mph 57 / 58°F 93% 1013 mb
Low level cloud: 77%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

E
E

 5 / 8 mph 69 / 69°F 73% 1012 mb
Low level cloud: 86%
Mid level cloud: 25%
High level cloud: 96%
Most Significant Cloud Type: low
100%
0.0 In
19:00

ENE
ENE

 1 / 2 mph 54 / 54°F 96% 1015 mb
Low level cloud: 91%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Wed 29
May		01:00

WSW
WSW

 9 / 15 mph 63 / 63°F 97% 1009 mb
Low level cloud: 89%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: low
91%
0.7 In
07:00

WSW
WSW

 3 / 4 mph 58 / 58°F 88% 1014 mb
Low level cloud: 29%
Mid level cloud: 6%
High level cloud: 99%
Most Significant Cloud Type: low
43%
0.0 In
13:00

WSW
WSW

 11 / 21 mph 78 / 78°F 34% 1008 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
19:00

SW
SW

 6 / 8 mph 66 / 66°F 88% 1012 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 91%
Most Significant Cloud Type: medium
50%
0.0 In
Thu 30
May		01:00

WNW
WNW

 9 / 16 mph 53 / 51°F 92% 1012 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.1 In
07:00

WSW
WSW

 1 / 1 mph 62 / 62°F 94% 1012 mb
Low level cloud: 26%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: low
55%
0.0 In
13:00

NW
NW

 10 / 18 mph 63 / 63°F 45% 1014 mb
Low level cloud: 2%
Mid level cloud: 86%
High level cloud: 0%
Most Significant Cloud Type: medium
92%
0.0 In
19:00

SSE
SSE

 6 / 9 mph 63 / 63°F 91% 1011 mb
Low level cloud: 54%
Mid level cloud: 18%
High level cloud: 20%
Most Significant Cloud Type: low
62%
0.0 In
Fri 31
May		01:00

N
N

 4 / 7 mph 54 / 53°F 92% 1020 mb
Low level cloud: 90%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

S
S

 7 / 11 mph 56 / 54°F 99% 1011 mb
Low level cloud: 89%
Mid level cloud: 70%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.5 In
13:00

NE
NE

 7 / 12 mph 69 / 69°F 37% 1022 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
19:00

SW
SW

 3 / 4 mph 67 / 67°F 90% 1009 mb
Low level cloud: 53%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.1 In
Sat 01
Jun		01:00

W
W

 5 / 9 mph 58 / 58°F 82% 1022 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

WSW
WSW

 9 / 14 mph 56 / 54°F 98% 1010 mb
Low level cloud: 98%
Mid level cloud: 80%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.1 In
13:00

ESE
ESE

 2 / 4 mph 82 / 80°F 32% 1020 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
19:00

SW
SW

 9 / 15 mph 63 / 63°F 57% 1009 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.1 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