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Grosse Ile 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Grosse Ile

Michigan, United States Of America

Long range weather outlook for Grosse Ile includes 14 day forecast summary:

Reviewing the forecast for Grosse Ile Over the next 14 days and the average daytime maximum temperature will be around 22°C, with a high for the two weeks of 25°C expected on the evening of Tuesday 4th. The average minimum temperature will be 15°C, dipping to its lowest on the morning of Thursday 30th at 9°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The indicators are that Tuesday 4th will have the most precipitation with an accumulation of around 9.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Sun 26
May		01:00

NE
NE

 7 / 9 mph 67 / 67°F 68% 1011 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
04:00

NE
NE

 7 / 14 mph 60 / 60°F 86% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

 10 / 16 mph 64 / 62°F 85% 1012 mb
Low level cloud: 2%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 13 / 16 mph 72 / 76°F 78% 1011 mb
Low level cloud: 2%
Mid level cloud: 15%
High level cloud: 21%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 14 / 18 mph 74 / 76°F 72% 1008 mb
Low level cloud: 18%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 19 / 29 mph 71 / 69°F 77% 1003 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

E
E

 2 / 4 mph 68 / 65°F 96% 1003 mb
Low level cloud: 38%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
66%
Expect 0.5 In of precipitation over the past 3 hours.
0.5 In
22:00

ENE
ENE

 7 / 10 mph 62 / 62°F 95% 1003 mb
Low level cloud: 74%
Mid level cloud: 43%
High level cloud: 5%
Most Significant Cloud Type: low
89%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Mon 27
May		19:00

W
W

 20 / 27 mph 61 / 61°F 79% 1004 mb
Low level cloud: 98%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 18 / 24 mph 60 / 60°F 80% 1006 mb
Low level cloud: 75%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May		01:00

W
W

 15 / 19 mph 57 / 53°F 86% 1006 mb
Low level cloud: 62%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

 13 / 17 mph 55 / 51°F 89% 1007 mb
Low level cloud: 41%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 13 / 17 mph 56 / 52°F 86% 1008 mb
Low level cloud: 77%
Mid level cloud: 31%
High level cloud: 33%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

 17 / 21 mph 60 / 60°F 78% 1010 mb
Low level cloud: 80%
Mid level cloud: 46%
High level cloud: 12%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

 15 / 19 mph 62 / 61°F 73% 1012 mb
Low level cloud: 11%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: medium
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 15 / 20 mph 67 / 65°F 68% 1012 mb
Low level cloud: 42%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 8 / 11 mph 66 / 64°F 74% 1013 mb
Low level cloud: 16%
Mid level cloud: 27%
High level cloud: 2%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 8 / 13 mph 59 / 57°F 86% 1014 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 19%
Most Significant Cloud Type: medium
28%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Wed 29
May		01:00

NW
NW

 8 / 12 mph 56 / 54°F 91% 1014 mb
Low level cloud: 7%
Mid level cloud: 65%
High level cloud: 0%
Most Significant Cloud Type: medium
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNW
NNW

 9 / 13 mph 55 / 53°F 92% 1014 mb
Low level cloud: 19%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

NNW
NNW

 8 / 12 mph 56 / 53°F 87% 1016 mb
Low level cloud: 12%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: medium
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 11 / 14 mph 62 / 60°F 68% 1017 mb
Low level cloud: 32%
Mid level cloud: 43%
High level cloud: 5%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 14 / 20 mph 61 / 60°F 75% 1018 mb
Low level cloud: 58%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: low
76%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

N
N

 10 / 13 mph 63 / 62°F 64% 1018 mb
Low level cloud: 70%
Mid level cloud: 22%
High level cloud: 6%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 9 / 11 mph 63 / 61°F 56% 1019 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 7 / 10 mph 55 / 53°F 58% 1020 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
Thu 30
May		01:00

N
N

 5 / 7 mph 53 / 52°F 54% 1020 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 6 / 10 mph 51 / 49°F 55% 1021 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
07:00

NNW
NNW

 5 / 8 mph 53 / 50°F 57% 1022 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 6 / 7 mph 60 / 58°F 48% 1022 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 3 / 4 mph 66 / 63°F 39% 1020 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 6 / 7 mph 66 / 63°F 44% 1020 mb
Low level cloud: 0%
Mid level cloud: 35%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

 10 / 13 mph 61 / 60°F 57% 1021 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 6 / 7 mph 56 / 55°F 62% 1023 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 31
May		01:00

NNE
NNE

 6 / 9 mph 53 / 51°F 66% 1022 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
04:00

N
N

 7 / 10 mph 51 / 48°F 64% 1024 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
07:00

NE
NE

 6 / 8 mph 53 / 50°F 59% 1025 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
10:00

NNW
NNW

 3 / 3 mph 63 / 61°F 43% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 7%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 3 / 3 mph 69 / 67°F 40% 1025 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 8%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

 5 / 6 mph 72 / 69°F 39% 1023 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
19:00

ESE
ESE

 4 / 4 mph 72 / 69°F 55% 1023 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
22:00

NE
NE

 2 / 2 mph 65 / 65°F 64% 1024 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
Sat 01
Jun		01:00

E
E

 4 / 7 mph 60 / 60°F 68% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SE
SE

 1 / 1 mph 58 / 58°F 68% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 2 / 3 mph 60 / 60°F 65% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 3 / 4 mph 67 / 65°F 50% 1024 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

SSE
SSE

 9 / 10 mph 70 / 68°F 42% 1022 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
16:00

SE
SE

 8 / 10 mph 69 / 68°F 43% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 99%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 8 / 12 mph 68 / 66°F 57% 1020 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 9 / 14 mph 65 / 65°F 68% 1019 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 12%
Most Significant Cloud Type: medium
21%
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
Jun		01:00

SE
SE

 5 / 11 mph 72 / 76°F 59% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

SSW
SSW

 15 / 33 mph 68 / 68°F 86% 1016 mb
Low level cloud: 14%
Mid level cloud: 22%
High level cloud: 86%
Most Significant Cloud Type: low
31%
0.0 In
13:00

SSE
SSE

 7 / 16 mph 77 / 78°F 49% 1022 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 1%
Most Significant Cloud Type: medium
15%
0.0 In
19:00

W
W

 9 / 18 mph 78 / 81°F 79% 1016 mb
Low level cloud: 2%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.0 In
Mon 03
Jun		01:00

SW
SW

 14 / 30 mph 66 / 66°F 80% 1012 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 1%
Most Significant Cloud Type: medium
21%
0.0 In
07:00

WSW
WSW

 15 / 30 mph 62 / 62°F 90% 1009 mb
Low level cloud: 82%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
87%
0.0 In
13:00

SSW
SSW

 4 / 8 mph 76 / 78°F 63% 1010 mb
Low level cloud: 7%
Mid level cloud: 24%
High level cloud: 98%
Most Significant Cloud Type: medium
46%
0.0 In
19:00

WSW
WSW

 6 / 13 mph 70 / 70°F 91% 1011 mb
Low level cloud: 48%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
67%
0.0 In
Tue 04
Jun		01:00

S
S

 13 / 28 mph 68 / 68°F 91% 1007 mb
Low level cloud: 13%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
86%
0.0 In
07:00

WNW
WNW

 5 / 11 mph 66 / 66°F 83% 1010 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
13:00

NW
NW

 9 / 19 mph 74 / 77°F 75% 1005 mb
Low level cloud: 77%
Mid level cloud: 36%
High level cloud: 0%
Most Significant Cloud Type: low
89%
0.2 In
19:00

WNW
WNW

 12 / 25 mph 72 / 76°F 64% 1008 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
Wed 05
Jun		01:00

ENE
ENE

 6 / 13 mph 69 / 69°F 88% 1007 mb
Low level cloud: 2%
Mid level cloud: 16%
High level cloud: 5%
Most Significant Cloud Type: medium
20%
0.0 In
07:00

W
W

 6 / 12 mph 65 / 65°F 77% 1010 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 20%
Most Significant Cloud Type: medium
15%
0.0 In
13:00

SSW
SSW

 7 / 15 mph 78 / 80°F 59% 1007 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 99%
Most Significant Cloud Type: medium
29%
0.0 In
19:00

W
W

 10 / 21 mph 65 / 65°F 80% 1009 mb
Low level cloud: 0%
Mid level cloud: 93%
High level cloud: 87%
Most Significant Cloud Type: medium
96%
0.0 In
Thu 06
Jun		01:00

SW
SW

 8 / 17 mph 69 / 69°F 77% 1004 mb
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
54%
0.0 In
07:00

WNW
WNW

 5 / 11 mph 62 / 62°F 90% 1007 mb
Low level cloud: 89%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
13:00

W
W

 11 / 23 mph 81 / 83°F 58% 1002 mb
Low level cloud: 13%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
22%
0.2 In
19:00

WSW
WSW

 8 / 17 mph 70 / 70°F 75% 1002 mb
Low level cloud: 0%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: medium
53%
0.1 In
Fri 07
Jun		01:00

NW
NW

 13 / 28 mph 64 / 64°F 84% 1003 mb
Low level cloud: 93%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

N
N

 15 / 30 mph 61 / 61°F 77% 1005 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: medium
73%
0.3 In
13:00

W
W

 18 / 38 mph 73 / 77°F 63% 1001 mb
Low level cloud: 41%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.0 In
19:00

N
N

 8 / 17 mph 69 / 69°F 65% 1010 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
0.0 In
Sat 08
Jun		01:00

WNW
WNW

 22 / 47 mph 60 / 60°F 61% 1002 mb
Low level cloud: 26%
Mid level cloud: 44%
High level cloud: 11%
Most Significant Cloud Type: low
42%
0.1 In
07:00

NNW
NNW

 9 / 20 mph 62 / 62°F 74% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NW
NW

 15 / 30 mph 65 / 65°F 74% 1006 mb
Low level cloud: 85%
Mid level cloud: 71%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
19:00

SSE
SSE

 4 / 8 mph 73 / 77°F 62% 1016 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
72%
0.0 In
Sun 09
Jun		01:00

NW
NW

 8 / 16 mph 62 / 62°F 85% 1011 mb
Low level cloud: 3%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: medium
61%
0.0 In
07:00

SW
SW

 4 / 9 mph 68 / 68°F 75% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
8%
0.0 In
13:00

W
W

 4 / 8 mph 71 / 71°F 49% 1014 mb
Low level cloud: 0%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: medium
76%
0.0 In
19:00

SSW
SSW

 7 / 16 mph 81 / 85°F 67% 1011 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: medium
6%
0.0 In
Mon 10
Jun		01:00

ENE
ENE

 3 / 7 mph 67 / 67°F 63% 1016 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 16%
Most Significant Cloud Type: medium
28%
0.0 In
07:00

SSW
SSW

 12 / 25 mph 68 / 67°F 80% 1008 mb
Low level cloud: 10%
Mid level cloud: 33%
High level cloud: 87%
Most Significant Cloud Type: medium
65%
0.0 In
13:00

S
S

 5 / 11 mph 74 / 77°F 47% 1017 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
19:00

SSW
SSW

 11 / 24 mph 78 / 82°F 77% 1004 mb
Low level cloud: 8%
Mid level cloud: 36%
High level cloud: 7%
Most Significant Cloud Type: medium
59%
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