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Chelwood 14 Day Long Range Forecast

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

Bath and North East Somerset, United Kingdom

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

The outlook for Chelwood in the two weeks ahead shows the average daytime maximum temperature will be around 11°C, with a high for the two weeks of 16°C expected on the afternoon of Wednesday 1st. The average minimum temperature will be 5°C, dipping to its lowest on the morning of Sunday 29th at 1°C. The coming 14 days will have most days seeing a little rain. The indicators are that Sunday 5th will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 27
Mar		18:00

NW
NW

 10 / 17 mph 47 / 42°F 83% 1019 mb
Low level cloud: 73%
Mid level cloud: 0%
High level cloud: 88%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 11 / 21 mph 43 / 36°F 83% 1021 mb
Low level cloud: 46%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 28
Mar		00:00

NW
NW

 11 / 17 mph 42 / 35°F 78% 1023 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 10 / 17 mph 39 / 32°F 76% 1024 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
06:00

W
W

 9 / 16 mph 36 / 30°F 77% 1025 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

 14 / 17 mph 44 / 37°F 65% 1027 mb
Low level cloud: 12%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

 16 / 20 mph 48 / 41°F 54% 1028 mb
Low level cloud: 10%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 17 / 22 mph 47 / 40°F 59% 1029 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
18:00

NW
NW

 11 / 17 mph 44 / 37°F 65% 1031 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 7 / 13 mph 38 / 33°F 78% 1033 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 21%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 29
Mar		00:00

W
W

 5 / 10 mph 37 / 33°F 84% 1034 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 5 / 11 mph 35 / 31°F 87% 1033 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 11%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 5 / 11 mph 34 / 30°F 90% 1032 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 71%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 11 / 13 mph 46 / 40°F 76% 1031 mb
Low level cloud: 40%
Mid level cloud: 20%
High level cloud: 77%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

 16 / 20 mph 48 / 41°F 77% 1029 mb
Low level cloud: 64%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 21 / 26 mph 48 / 41°F 83% 1026 mb
Low level cloud: 89%
Mid level cloud: 76%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 19 / 28 mph 47 / 40°F 96% 1023 mb
Low level cloud: 100%
Mid level cloud: 92%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 13 / 22 mph 48 / 43°F 93% 1023 mb
Low level cloud: 71%
Mid level cloud: 12%
High level cloud: 6%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 30
Mar		00:00

W
W

 12 / 21 mph 45 / 39°F 93% 1024 mb
Low level cloud: 14%
Mid level cloud: 9%
High level cloud: 15%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 8 / 15 mph 41 / 36°F 92% 1024 mb
Low level cloud: 31%
Mid level cloud: 9%
High level cloud: 3%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 8 / 15 mph 40 / 34°F 90% 1025 mb
Low level cloud: 83%
Mid level cloud: 14%
High level cloud: 4%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 12 / 14 mph 48 / 42°F 76% 1026 mb
Low level cloud: 67%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 14 / 16 mph 51 / 46°F 65% 1027 mb
Low level cloud: 80%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 15 / 18 mph 53 / 48°F 63% 1027 mb
Low level cloud: 75%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 13 / 20 mph 49 / 43°F 73% 1028 mb
Low level cloud: 7%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 9 / 15 mph 45 / 40°F 86% 1030 mb
Low level cloud: 1%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 31
Mar		00:00

W
W

 7 / 13 mph 43 / 39°F 90% 1030 mb
Low level cloud: 11%
Mid level cloud: 16%
High level cloud: 17%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 7 / 13 mph 43 / 39°F 92% 1029 mb
Low level cloud: 13%
Mid level cloud: 95%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 9 / 16 mph 47 / 43°F 94% 1029 mb
Low level cloud: 38%
Mid level cloud: 16%
High level cloud: 79%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 8 / 9 mph 53 / 51°F 85% 1029 mb
Low level cloud: 85%
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
12:00

NW
NW

 12 / 13 mph 56 / 53°F 79% 1028 mb
Low level cloud: 94%
Mid level cloud: 43%
High level cloud: 96%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

 11 / 14 mph 57 / 54°F 72% 1028 mb
Low level cloud: 83%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NW
NW

 9 / 14 mph 54 / 51°F 71% 1028 mb
Low level cloud: 72%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 6 / 12 mph 46 / 44°F 83% 1029 mb
Low level cloud: 73%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 01
Apr		00:00

NW
NW

 7 / 12 mph 51 / 48°F 67% 1028 mb
Low level cloud: 79%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 5 / 8 mph 49 / 47°F 73% 1028 mb
Low level cloud: 91%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 3 / 6 mph 49 / 48°F 71% 1028 mb
Low level cloud: 88%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

 4 / 5 mph 54 / 53°F 67% 1028 mb
Low level cloud: 96%
Mid level cloud: 4%
High level cloud: 5%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

 6 / 7 mph 60 / 58°F 62% 1027 mb
Low level cloud: 22%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 6 / 8 mph 61 / 60°F 64% 1026 mb
Low level cloud: 58%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 8 / 12 mph 54 / 51°F 82% 1025 mb
Low level cloud: 61%
Mid level cloud: 44%
High level cloud: 51%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 7 / 12 mph 48 / 45°F 91% 1025 mb
Low level cloud: 28%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 02
Apr		00:00

WSW
WSW

 6 / 11 mph 46 / 43°F 94% 1024 mb
Low level cloud: 41%
Mid level cloud: 100%
High level cloud: 85%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 6 / 10 mph 46 / 43°F 91% 1022 mb
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 48%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 7 / 11 mph 46 / 43°F 87% 1021 mb
Low level cloud: 11%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 11 / 14 mph 50 / 45°F 80% 1018 mb
Low level cloud: 3%
Mid level cloud: 93%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 14 / 17 mph 53 / 48°F 79% 1016 mb
Low level cloud: 91%
Mid level cloud: 33%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 15 / 21 mph 51 / 45°F 88% 1013 mb
Low level cloud: 100%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 15 / 22 mph 47 / 41°F 93% 1013 mb
Low level cloud: 81%
Mid level cloud: 100%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

WNW
WNW

 12 / 19 mph 41 / 34°F 86% 1014 mb
Low level cloud: 0%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Fri 03
Apr		00:00

SE
SE

 3 / 4 mph 45 / 44°F 78% 1031 mb
Low level cloud: 34%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
06:00

ESE
ESE

 7 / 13 mph 38 / 32°F 91% 1025 mb
Low level cloud: 3%
Mid level cloud: 1%
High level cloud: 9%
Most Significant Cloud Type: low
4%
0.0 In
12:00

SE
SE

 12 / 18 mph 53 / 49°F 54% 1020 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

SE
SE

 11 / 16 mph 47 / 41°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 14%
Most Significant Cloud Type: medium
28%
0.0 In
Sat 04
Apr		00:00

ESE
ESE

 5 / 8 mph 39 / 36°F 79% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
0.0 In
06:00

SSE
SSE

 9 / 15 mph 40 / 34°F 74% 1012 mb
Low level cloud: 0%
Mid level cloud: 40%
High level cloud: 100%
Most Significant Cloud Type: medium
44%
0.0 In
12:00

WNW
WNW

 9 / 16 mph 56 / 54°F 61% 1016 mb
Low level cloud: 23%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: low
24%
0.0 In
18:00

WSW
WSW

 9 / 17 mph 56 / 53°F 80% 1018 mb
Low level cloud: 5%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
60%
0.0 In
Sun 05
Apr		00:00

SSW
SSW

 15 / 29 mph 52 / 47°F 91% 1013 mb
Low level cloud: 100%
Mid level cloud: 47%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.0 In
06:00

S
S

 5 / 11 mph 42 / 39°F 96% 1020 mb
Low level cloud: 62%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: low
64%
0.0 In
12:00

SSW
SSW

 20 / 38 mph 54 / 49°F 87% 1007 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

S
S

 9 / 17 mph 55 / 52°F 85% 1018 mb
Low level cloud: 4%
Mid level cloud: 13%
High level cloud: 33%
Most Significant Cloud Type: medium
23%
0.0 In
Mon 06
Apr		00:00

WSW
WSW

 11 / 21 mph 40 / 33°F 81% 1009 mb
Low level cloud: 30%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
57%
0.3 In
06:00

S
S

 6 / 12 mph 51 / 48°F 97% 1013 mb
Low level cloud: 57%
Mid level cloud: 7%
High level cloud: 30%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 15 / 32 mph 44 / 37°F 76% 1011 mb
Low level cloud: 27%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.1 In
18:00

S
S

 11 / 20 mph 54 / 51°F 87% 1013 mb
Low level cloud: 23%
Mid level cloud: 12%
High level cloud: 89%
Most Significant Cloud Type: low
38%
0.0 In
Tue 07
Apr		00:00

W
W

 9 / 19 mph 38 / 31°F 89% 1014 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
4%
0.1 In
06:00

N
N

 3 / 6 mph 50 / 49°F 94% 1013 mb
Low level cloud: 58%
Mid level cloud: 66%
High level cloud: 12%
Most Significant Cloud Type: low
82%
0.0 In
12:00

SSW
SSW

 4 / 9 mph 50 / 48°F 75% 1013 mb
Low level cloud: 86%
Mid level cloud: 43%
High level cloud: 26%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNE
NNE

 20 / 38 mph 41 / 31°F 95% 1014 mb
Low level cloud: 97%
Mid level cloud: 74%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Wed 08
Apr		00:00

NE
NE

 1 / 3 mph 45 / 45°F 90% 1021 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

NE
NE

 13 / 25 mph 42 / 35°F 96% 1021 mb
Low level cloud: 98%
Mid level cloud: 46%
High level cloud: 17%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SW
SW

 9 / 19 mph 55 / 53°F 64% 1025 mb
Low level cloud: 83%
Mid level cloud: 13%
High level cloud: 17%
Most Significant Cloud Type: low
89%
0.0 In
18:00

ENE
ENE

 9 / 18 mph 49 / 45°F 91% 1023 mb
Low level cloud: 100%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
Thu 09
Apr		00:00

SSW
SSW

 7 / 14 mph 51 / 48°F 90% 1027 mb
Low level cloud: 100%
Mid level cloud: 26%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

 11 / 21 mph 45 / 39°F 92% 1019 mb
Low level cloud: 72%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: low
88%
0.0 In
12:00

W
W

 3 / 6 mph 54 / 54°F 82% 1028 mb
Low level cloud: 67%
Mid level cloud: 40%
High level cloud: 12%
Most Significant Cloud Type: low
82%
0.0 In
18:00

SSE
SSE

 7 / 14 mph 54 / 51°F 87% 1016 mb
Low level cloud: 91%
Mid level cloud: 60%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.0 In
Fri 10
Apr		00:00

NNW
NNW

 2 / 5 mph 46 / 45°F 70% 1027 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

ENE
ENE

 4 / 8 mph 51 / 50°F 98% 1016 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.2 In
12:00

W
W

 6 / 12 mph 51 / 49°F 61% 1020 mb
Low level cloud: 38%
Mid level cloud: 29%
High level cloud: 17%
Most Significant Cloud Type: low
49%
0.0 In
18:00

ESE
ESE

 3 / 6 mph 57 / 57°F 95% 1020 mb
Low level cloud: 73%
Mid level cloud: 48%
High level cloud: 82%
Most Significant Cloud Type: low
99%
0.1 In
Sat 11
Apr		00:00

SSW
SSW

 11 / 22 mph 42 / 35°F 82% 1013 mb
Low level cloud: 70%
Mid level cloud: 100%
High level cloud: 85%
Most Significant Cloud Type: low
100%
0.0 In
06:00

ENE
ENE

 4 / 9 mph 52 / 50°F 98% 1023 mb
Low level cloud: 79%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

W
W

 4 / 8 mph 47 / 46°F 77% 1004 mb
Low level cloud: 39%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.4 In
18:00

E
E

 6 / 13 mph 57 / 56°F 96% 1024 mb
Low level cloud: 69%
Mid level cloud: 43%
High level cloud: 99%
Most Significant Cloud Type: low
96%
0.3 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