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Aldergrove Airport 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Aldergrove Airport

County Antrim, United Kingdom

Long range weather outlook for Aldergrove Airport includes 14 day forecast summary:

Taking a look at Aldergrove Airport over the coming two weeks and the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 19°C expected on the afternoon of Thursday 16th. The mean minimum temperature will be 8°C, dipping to its lowest on the morning of Tuesday 21st at 5°C. The fortnight ahead will have mixed weather with some days dry and some seeing a little rain. Current predictions suggest Wednesday 15th will have the most precipitation with an accumulation of around 2.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 15
May		18:00

ESE
ESE

 7 / 10 mph 63 / 61°F 83% 1005 mb
Low level cloud: 24%
Mid level cloud: 51%
High level cloud: 5%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 5 / 9 mph 56 / 53°F 93% 1006 mb
Low level cloud: 5%
Mid level cloud: 24%
High level cloud: 3%
Most Significant Cloud Type: medium
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May		00:00

E
E

 4 / 8 mph 52 / 51°F 95% 1007 mb
Low level cloud: 10%
Mid level cloud: 14%
High level cloud: 5%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

 4 / 7 mph 50 / 49°F 96% 1007 mb
Low level cloud: 23%
Mid level cloud: 10%
High level cloud: 2%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

 4 / 6 mph 54 / 52°F 96% 1008 mb
Low level cloud: 45%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 6 / 8 mph 62 / 60°F 80% 1009 mb
Low level cloud: 72%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

 5 / 6 mph 66 / 63°F 72% 1009 mb
Low level cloud: 57%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 8 / 10 mph 66 / 64°F 74% 1009 mb
Low level cloud: 42%
Mid level cloud: 31%
High level cloud: 32%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 8 / 12 mph 62 / 59°F 87% 1009 mb
Low level cloud: 7%
Mid level cloud: 44%
High level cloud: 21%
Most Significant Cloud Type: medium
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

 8 / 15 mph 55 / 52°F 95% 1010 mb
Low level cloud: 75%
Mid level cloud: 9%
High level cloud: 83%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May		00:00

NNE
NNE

 7 / 13 mph 51 / 48°F 97% 1010 mb
Low level cloud: 30%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 6 / 13 mph 47 / 44°F 97% 1011 mb
Low level cloud: 48%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

 7 / 11 mph 53 / 49°F 93% 1011 mb
Low level cloud: 30%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 9 / 13 mph 57 / 53°F 86% 1012 mb
Low level cloud: 17%
Mid level cloud: 32%
High level cloud: 4%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 12 / 14 mph 64 / 63°F 75% 1012 mb
Low level cloud: 73%
Mid level cloud: 21%
High level cloud: 10%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

 12 / 17 mph 65 / 64°F 75% 1012 mb
Low level cloud: 52%
Mid level cloud: 21%
High level cloud: 13%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 11 / 15 mph 62 / 60°F 87% 1013 mb
Low level cloud: 43%
Mid level cloud: 26%
High level cloud: 10%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 9 / 14 mph 54 / 49°F 96% 1015 mb
Low level cloud: 44%
Mid level cloud: 18%
High level cloud: 16%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

NNW
NNW

 11 / 17 mph 50 / 46°F 94% 1016 mb
Low level cloud: 65%
Mid level cloud: 13%
High level cloud: 16%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 11 / 17 mph 50 / 46°F 91% 1017 mb
Low level cloud: 62%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 10 / 13 mph 51 / 47°F 91% 1018 mb
Low level cloud: 86%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 13 / 16 mph 54 / 50°F 84% 1018 mb
Low level cloud: 98%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 13 / 15 mph 59 / 55°F 73% 1018 mb
Low level cloud: 40%
Mid level cloud: 8%
High level cloud: 14%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

 14 / 16 mph 59 / 55°F 67% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 33%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 12 / 14 mph 55 / 51°F 75% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 10%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

 10 / 15 mph 50 / 45°F 83% 1020 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
Sun 19
May		00:00

NNW
NNW

 6 / 11 mph 47 / 44°F 95% 1020 mb
Low level cloud: 14%
Mid level cloud: 19%
High level cloud: 9%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

 5 / 10 mph 45 / 42°F 97% 1019 mb
Low level cloud: 48%
Mid level cloud: 23%
High level cloud: 32%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 5 / 8 mph 52 / 49°F 92% 1019 mb
Low level cloud: 73%
Mid level cloud: 32%
High level cloud: 48%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 6 / 7 mph 56 / 54°F 87% 1020 mb
Low level cloud: 88%
Mid level cloud: 41%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 3 / 4 mph 59 / 59°F 83% 1020 mb
Low level cloud: 94%
Mid level cloud: 75%
High level cloud: 73%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

 6 / 8 mph 58 / 57°F 84% 1020 mb
Low level cloud: 88%
Mid level cloud: 57%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

 7 / 9 mph 56 / 54°F 83% 1020 mb
Low level cloud: 71%
Mid level cloud: 72%
High level cloud: 84%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

 5 / 9 mph 54 / 50°F 89% 1021 mb
Low level cloud: 38%
Mid level cloud: 48%
High level cloud: 32%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

E
E

 9 / 14 mph 52 / 49°F 83% 1021 mb
Low level cloud: 9%
Mid level cloud: 46%
High level cloud: 14%
Most Significant Cloud Type: medium
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

 10 / 14 mph 51 / 47°F 87% 1021 mb
Low level cloud: 48%
Mid level cloud: 43%
High level cloud: 13%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 8 / 11 mph 52 / 47°F 83% 1021 mb
Low level cloud: 54%
Mid level cloud: 46%
High level cloud: 9%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

 9 / 11 mph 52 / 47°F 71% 1021 mb
Low level cloud: 23%
Mid level cloud: 30%
High level cloud: 11%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 9 / 11 mph 59 / 56°F 62% 1020 mb
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 7%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 11 / 12 mph 60 / 57°F 63% 1019 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 2%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 7 / 9 mph 58 / 56°F 68% 1019 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 2%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 5 / 11 mph 48 / 44°F 82% 1019 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 3%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

E
E

 6 / 13 mph 45 / 42°F 78% 1018 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
03:00

E
E

 8 / 16 mph 43 / 38°F 93% 1017 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
06:00

E
E

 8 / 12 mph 47 / 42°F 90% 1016 mb
Low level cloud: 25%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

 10 / 11 mph 54 / 50°F 75% 1016 mb
Low level cloud: 24%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

 10 / 11 mph 57 / 54°F 68% 1016 mb
Low level cloud: 59%
Mid level cloud: 5%
High level cloud: 89%
Most Significant Cloud Type: low
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 8 / 10 mph 60 / 57°F 65% 1015 mb
Low level cloud: 25%
Mid level cloud: 45%
High level cloud: 9%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

 7 / 8 mph 57 / 53°F 77% 1015 mb
Low level cloud: 0%
Mid level cloud: 58%
High level cloud: 100%
Most Significant Cloud Type: medium
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 4 / 7 mph 49 / 47°F 89% 1016 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 93%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 22
May		00:00

NW
NW

 6 / 12 mph 53 / 51°F 99% 1009 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

E
E

 10 / 17 mph 46 / 41°F 78% 1014 mb
Low level cloud: 4%
Mid level cloud: 66%
High level cloud: 16%
Most Significant Cloud Type: medium
76%
0.0 In
12:00

NE
NE

 14 / 21 mph 58 / 55°F 81% 1017 mb
Low level cloud: 46%
Mid level cloud: 49%
High level cloud: 100%
Most Significant Cloud Type: low
74%
0.0 In
18:00

ENE
ENE

 9 / 17 mph 49 / 45°F 82% 1018 mb
Low level cloud: 98%
Mid level cloud: 57%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
Thu 23
May		00:00

NNE
NNE

 6 / 12 mph 53 / 51°F 96% 1017 mb
Low level cloud: 37%
Mid level cloud: 45%
High level cloud: 32%
Most Significant Cloud Type: low
56%
0.0 In
06:00

SSE
SSE

 16 / 31 mph 53 / 48°F 95% 1009 mb
Low level cloud: 82%
Mid level cloud: 85%
High level cloud: 92%
Most Significant Cloud Type: low
100%
0.0 In
12:00

N
N

 4 / 9 mph 60 / 60°F 65% 1027 mb
Low level cloud: 77%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
18:00

NE
NE

 6 / 11 mph 65 / 65°F 76% 1022 mb
Low level cloud: 30%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: low
33%
0.0 In
Fri 24
May		00:00

ENE
ENE

 4 / 9 mph 52 / 51°F 90% 1026 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

E
E

 6 / 12 mph 50 / 47°F 93% 1023 mb
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: low
40%
0.0 In
12:00

ESE
ESE

 12 / 25 mph 61 / 61°F 69% 1023 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
0.0 In
18:00

SE
SE

 6 / 12 mph 64 / 64°F 72% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 25
May		00:00

ESE
ESE

 14 / 30 mph 55 / 52°F 89% 1020 mb
Low level cloud: 32%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
06:00

S
S

 2 / 4 mph 55 / 56°F 84% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
0.0 In
12:00

SE
SE

 14 / 29 mph 58 / 55°F 83% 1016 mb
Low level cloud: 91%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: low
95%
0.0 In
18:00

NW
NW

 10 / 18 mph 60 / 60°F 82% 1017 mb
Low level cloud: 38%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
48%
0.0 In
Sun 26
May		00:00

ESE
ESE

 5 / 11 mph 52 / 51°F 89% 1019 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: medium
47%
0.0 In
06:00

WNW
WNW

 4 / 8 mph 51 / 50°F 92% 1019 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
40%
0.0 In
12:00

E
E

 6 / 12 mph 66 / 66°F 69% 1021 mb
Low level cloud: 65%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
18:00

NNW
NNW

 9 / 17 mph 56 / 54°F 72% 1020 mb
Low level cloud: 48%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
48%
0.0 In
Mon 27
May		00:00

ENE
ENE

 6 / 13 mph 61 / 61°F 86% 1023 mb
Low level cloud: 15%
Mid level cloud: 5%
High level cloud: 50%
Most Significant Cloud Type: low
22%
0.0 In
06:00

W
W

 6 / 11 mph 48 / 46°F 95% 1021 mb
Low level cloud: 60%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: low
73%
0.0 In
12:00

ESE
ESE

 6 / 12 mph 68 / 68°F 68% 1023 mb
Low level cloud: 19%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
18:00

NNW
NNW

 13 / 25 mph 52 / 48°F 78% 1022 mb
Low level cloud: 18%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
33%
0.0 In
Tue 28
May		00:00

NNW
NNW

 6 / 12 mph 56 / 55°F 94% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

WNW
WNW

 10 / 20 mph 49 / 44°F 72% 1022 mb
Low level cloud: 79%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: low
92%
0.0 In
12:00

NNE
NNE

 12 / 26 mph 64 / 64°F 58% 1014 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 4%
Most Significant Cloud Type: medium
2%
0.0 In
18:00

W
W

 14 / 27 mph 55 / 51°F 68% 1020 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 22%
Most Significant Cloud Type: medium
44%
0.0 In
Wed 29
May		00:00

NE
NE

 8 / 16 mph 56 / 54°F 75% 1013 mb
Low level cloud: 37%
Mid level cloud: 33%
High level cloud: 31%
Most Significant Cloud Type: low
52%
0.0 In
06:00

WSW
WSW

 17 / 34 mph 48 / 41°F 76% 1014 mb
Low level cloud: 97%
Mid level cloud: 49%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NNE
NNE

 9 / 19 mph 68 / 68°F 69% 1011 mb
Low level cloud: 8%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
18:00

WNW
WNW

 14 / 28 mph 54 / 51°F 80% 1013 mb
Low level cloud: 60%
Mid level cloud: 14%
High level cloud: 8%
Most Significant Cloud Type: low
66%
0.1 In
Thu 30
May		00:00

N
N

 5 / 10 mph 59 / 59°F 91% 1008 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 9%
Most Significant Cloud Type: medium
16%
0.0 In
06:00

W
W

 5 / 10 mph 49 / 48°F 94% 1013 mb
Low level cloud: 66%
Mid level cloud: 90%
High level cloud: 15%
Most Significant Cloud Type: low
99%
0.0 In
12:00

SE
SE

 6 / 12 mph 70 / 70°F 71% 1005 mb
Low level cloud: 68%
Mid level cloud: 7%
High level cloud: 21%
Most Significant Cloud Type: low
72%
0.0 In
18:00

SSW
SSW

 3 / 6 mph 53 / 53°F 97% 1012 mb
Low level cloud: 99%
Mid level cloud: 92%
High level cloud: 34%
Most Significant Cloud Type: low
100%
0.1 In

Other Locations Near to Aldergrove Airport

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