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Pentre-llyn-cymmer 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Pentre-llyn-cymmer

Denbighshire, United Kingdom

Long range weather outlook for Pentre-llyn-cymmer includes 14 day forecast summary:

The forecast for Pentre-llyn-cymmer in the coming two weeks is predicting the average daytime maximum temperature will be around 15°C, with a high for the two weeks of 19°C expected on the afternoon of Friday 31st. The average minimum temperature will be 7°C, dipping to its lowest on the morning of Tuesday 28th at 3°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. Current predictions suggest Wednesday 22nd will have the most precipitation with an accumulation of around 16.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 22
May		18:00

WNW
WNW

 13 / 17 mph 52 / 47°F 97% 1007 mb
Low level cloud: 97%
Mid level cloud: 100%
High level cloud: 100%
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 / 16 mph 50 / 46°F 98% 1009 mb
Low level cloud: 97%
Mid level cloud: 95%
High level cloud: 40%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 23
May		00:00

WNW
WNW

 16 / 25 mph 46 / 40°F 97% 1009 mb
Low level cloud: 99%
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
03:00

WNW
WNW

 16 / 22 mph 45 / 38°F 97% 1010 mb
Low level cloud: 97%
Mid level cloud: 66%
High level cloud: 96%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 15 / 20 mph 45 / 38°F 96% 1011 mb
Low level cloud: 96%
Mid level cloud: 55%
High level cloud: 80%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

 14 / 17 mph 46 / 40°F 96% 1013 mb
Low level cloud: 96%
Mid level cloud: 49%
High level cloud: 57%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 15 / 17 mph 48 / 42°F 92% 1013 mb
Low level cloud: 97%
Mid level cloud: 49%
High level cloud: 43%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 13 / 15 mph 49 / 44°F 90% 1014 mb
Low level cloud: 98%
Mid level cloud: 43%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 11 / 12 mph 48 / 44°F 91% 1015 mb
Low level cloud: 92%
Mid level cloud: 48%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

 9 / 11 mph 47 / 43°F 90% 1015 mb
Low level cloud: 91%
Mid level cloud: 43%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 24
May		00:00

W
W

 8 / 10 mph 47 / 43°F 90% 1016 mb
Low level cloud: 90%
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
03:00

W
W

 7 / 9 mph 47 / 43°F 90% 1016 mb
Low level cloud: 94%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WSW
WSW

 6 / 6 mph 47 / 44°F 92% 1017 mb
Low level cloud: 86%
Mid level cloud: 100%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

 5 / 6 mph 49 / 46°F 88% 1018 mb
Low level cloud: 94%
Mid level cloud: 79%
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

WSW
WSW

 5 / 6 mph 52 / 50°F 81% 1018 mb
Low level cloud: 96%
Mid level cloud: 71%
High level cloud: 80%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

 3 / 4 mph 51 / 50°F 84% 1019 mb
Low level cloud: 86%
Mid level cloud: 71%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

 2 / 2 mph 54 / 54°F 77% 1019 mb
Low level cloud: 79%
Mid level cloud: 30%
High level cloud: 9%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

 1 / 1 mph 48 / 47°F 87% 1020 mb
Low level cloud: 40%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 25
May		00:00

SSE
SSE

 2 / 5 mph 41 / 40°F 96% 1020 mb
Low level cloud: 43%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 2 / 5 mph 45 / 45°F 93% 1019 mb
Low level cloud: 14%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 2 / 4 mph 48 / 47°F 94% 1019 mb
Low level cloud: 45%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSE
SSE

 8 / 9 mph 58 / 55°F 65% 1018 mb
Low level cloud: 2%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 10 / 12 mph 63 / 62°F 56% 1017 mb
Low level cloud: 15%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 9 / 11 mph 65 / 62°F 56% 1016 mb
Low level cloud: 4%
Mid level cloud: 32%
High level cloud: 18%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSW
SSW

 3 / 4 mph 64 / 62°F 71% 1016 mb
Low level cloud: 1%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

 1 / 2 mph 48 / 47°F 92% 1017 mb
Low level cloud: 11%
Mid level cloud: 44%
High level cloud: 5%
Most Significant Cloud Type: medium
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 26
May		00:00

SSW
SSW

 1 / 2 mph 45 / 45°F 94% 1017 mb
Low level cloud: 3%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 3 / 6 mph 44 / 43°F 92% 1016 mb
Low level cloud: 17%
Mid level cloud: 58%
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

SSE
SSE

 3 / 5 mph 52 / 50°F 83% 1015 mb
Low level cloud: 32%
Mid level cloud: 62%
High level cloud: 90%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 6 / 6 mph 57 / 55°F 73% 1015 mb
Low level cloud: 47%
Mid level cloud: 79%
High level cloud: 82%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 7 / 8 mph 57 / 55°F 81% 1014 mb
Low level cloud: 1%
Mid level cloud: 91%
High level cloud: 2%
Most Significant Cloud Type: medium
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

 5 / 7 mph 58 / 56°F 88% 1013 mb
Low level cloud: 40%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

 5 / 7 mph 58 / 56°F 93% 1013 mb
Low level cloud: 35%
Mid level cloud: 27%
High level cloud: 3%
Most Significant Cloud Type: low
44%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

SW
SW

 6 / 11 mph 48 / 44°F 97% 1015 mb
Low level cloud: 28%
Mid level cloud: 4%
High level cloud: 16%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 27
May		00:00

SW
SW

 7 / 12 mph 46 / 43°F 97% 1015 mb
Low level cloud: 68%
Mid level cloud: 3%
High level cloud: 4%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WSW
WSW

 5 / 8 mph 49 / 47°F 93% 1016 mb
Low level cloud: 81%
Mid level cloud: 7%
High level cloud: 32%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

W
W

 4 / 5 mph 52 / 50°F 95% 1017 mb
Low level cloud: 50%
Mid level cloud: 24%
High level cloud: 4%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 9 / 11 mph 56 / 52°F 78% 1018 mb
Low level cloud: 59%
Mid level cloud: 39%
High level cloud: 2%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 10 / 12 mph 58 / 55°F 62% 1019 mb
Low level cloud: 86%
Mid level cloud: 49%
High level cloud: 1%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 11 / 12 mph 57 / 55°F 60% 1019 mb
Low level cloud: 75%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

 10 / 11 mph 54 / 50°F 67% 1020 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

 5 / 10 mph 42 / 38°F 94% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 28
May		00:00

SW
SW

 5 / 10 mph 39 / 36°F 96% 1022 mb
Low level cloud: 4%
Mid level cloud: 6%
High level cloud: 6%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 4 / 8 mph 38 / 35°F 96% 1021 mb
Low level cloud: 3%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

 3 / 5 mph 46 / 44°F 86% 1020 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
09:00

SW
SW

 6 / 7 mph 54 / 52°F 71% 1019 mb
Low level cloud: 73%
Mid level cloud: 51%
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

SSW
SSW

 5 / 6 mph 54 / 51°F 87% 1018 mb
Low level cloud: 28%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSW
SSW

 9 / 10 mph 55 / 51°F 85% 1017 mb
Low level cloud: 40%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: low
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

 7 / 8 mph 54 / 52°F 82% 1016 mb
Low level cloud: 67%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 5 / 7 mph 50 / 48°F 98% 1015 mb
Low level cloud: 71%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 29
May		00:00

SW
SW

 3 / 6 mph 44 / 43°F 88% 1025 mb
Low level cloud: 0%
Mid level cloud: 41%
High level cloud: 1%
Most Significant Cloud Type: medium
40%
0.0 In
06:00

S
S

 4 / 9 mph 51 / 50°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 98%
Most Significant Cloud Type: medium
29%
0.0 In
12:00

WSW
WSW

 11 / 21 mph 59 / 57°F 61% 1009 mb
Low level cloud: 66%
Mid level cloud: 39%
High level cloud: 99%
Most Significant Cloud Type: low
91%
0.0 In
18:00

NW
NW

 3 / 6 mph 54 / 54°F 99% 1009 mb
Low level cloud: 99%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Thu 30
May		00:00

SSW
SSW

 10 / 21 mph 50 / 46°F 94% 1009 mb
Low level cloud: 58%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
73%
0.0 In
06:00

WSW
WSW

 3 / 6 mph 54 / 54°F 93% 1010 mb
Low level cloud: 80%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
12:00

NNE
NNE

 4 / 8 mph 56 / 56°F 73% 1013 mb
Low level cloud: 93%
Mid level cloud: 67%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

S
S

 3 / 7 mph 62 / 62°F 94% 1006 mb
Low level cloud: 16%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Fri 31
May		00:00

SW
SW

 3 / 5 mph 45 / 44°F 90% 1012 mb
Low level cloud: 1%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
0.0 In
06:00

E
E

 5 / 10 mph 56 / 55°F 98% 1006 mb
Low level cloud: 78%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

WSW
WSW

 5 / 10 mph 56 / 55°F 69% 1010 mb
Low level cloud: 67%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
18:00

ESE
ESE

 11 / 23 mph 60 / 60°F 96% 1002 mb
Low level cloud: 81%
Mid level cloud: 59%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.2 In
Sat 01
Jun		00:00

SW
SW

 2 / 3 mph 46 / 46°F 94% 1012 mb
Low level cloud: 15%
Mid level cloud: 12%
High level cloud: 3%
Most Significant Cloud Type: low
19%
0.1 In
06:00

SE
SE

 4 / 9 mph 53 / 52°F 98% 1004 mb
Low level cloud: 72%
Mid level cloud: 20%
High level cloud: 49%
Most Significant Cloud Type: low
84%
0.4 In
12:00

ENE
ENE

 5 / 11 mph 59 / 58°F 79% 1010 mb
Low level cloud: 30%
Mid level cloud: 21%
High level cloud: 13%
Most Significant Cloud Type: low
38%
0.1 In
18:00

SSE
SSE

 13 / 27 mph 59 / 56°F 85% 1007 mb
Low level cloud: 81%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.0 In
Sun 02
Jun		00:00

ENE
ENE

 6 / 13 mph 49 / 46°F 99% 1011 mb
Low level cloud: 95%
Mid level cloud: 100%
High level cloud: 92%
Most Significant Cloud Type: low
100%
0.6 In
06:00

SSE
SSE

 9 / 18 mph 50 / 47°F 84% 1013 mb
Low level cloud: 62%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: low
64%
0.0 In
12:00

NE
NE

 6 / 13 mph 49 / 47°F 97% 1013 mb
Low level cloud: 98%
Mid level cloud: 100%
High level cloud: 66%
Most Significant Cloud Type: low
100%
0.2 In
18:00

SSE
SSE

 7 / 15 mph 59 / 59°F 77% 1015 mb
Low level cloud: 3%
Mid level cloud: 16%
High level cloud: 3%
Most Significant Cloud Type: medium
25%
0.0 In
Mon 03
Jun		00:00

NW
NW

 3 / 6 mph 47 / 47°F 98% 1014 mb
Low level cloud: 62%
Mid level cloud: 86%
High level cloud: 33%
Most Significant Cloud Type: low
96%
0.2 In
06:00

SSE
SSE

 3 / 6 mph 53 / 54°F 92% 1016 mb
Low level cloud: 2%
Mid level cloud: 18%
High level cloud: 58%
Most Significant Cloud Type: medium
26%
0.0 In
12:00

W
W

 10 / 20 mph 58 / 56°F 64% 1011 mb
Low level cloud: 4%
Mid level cloud: 34%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
0.0 In
18:00

SSE
SSE

 3 / 6 mph 56 / 57°F 92% 1015 mb
Low level cloud: 39%
Mid level cloud: 100%
High level cloud: 99%
Most Significant Cloud Type: low
85%
0.2 In
Tue 04
Jun		00:00

SSW
SSW

 8 / 16 mph 48 / 44°F 97% 1005 mb
Low level cloud: 89%
Mid level cloud: 51%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SW
SW

 3 / 6 mph 54 / 54°F 96% 1014 mb
Low level cloud: 26%
Mid level cloud: 8%
High level cloud: 7%
Most Significant Cloud Type: low
29%
0.2 In
12:00

WSW
WSW

 16 / 34 mph 54 / 49°F 66% 1006 mb
Low level cloud: 51%
Mid level cloud: 45%
High level cloud: 2%
Most Significant Cloud Type: low
66%
0.1 In
18:00

SW
SW

 4 / 9 mph 61 / 61°F 90% 1014 mb
Low level cloud: 30%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
35%
0.2 In
Wed 05
Jun		00:00

WSW
WSW

 11 / 23 mph 46 / 41°F 97% 1007 mb
Low level cloud: 93%
Mid level cloud: 36%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
06:00

SSE
SSE

 4 / 8 mph 52 / 51°F 97% 1013 mb
Low level cloud: 41%
Mid level cloud: 52%
High level cloud: 100%
Most Significant Cloud Type: low
71%
0.0 In
12:00

WNW
WNW

 6 / 14 mph 54 / 52°F 81% 1009 mb
Low level cloud: 86%
Mid level cloud: 46%
High level cloud: 75%
Most Significant Cloud Type: low
100%
0.1 In
18:00

S
S

 6 / 13 mph 58 / 57°F 94% 1012 mb
Low level cloud: 73%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: low
89%
0.1 In
Thu 06
Jun		00:00

W
W

 4 / 9 mph 42 / 40°F 96% 1015 mb
Low level cloud: 27%
Mid level cloud: 10%
High level cloud: 4%
Most Significant Cloud Type: low
30%
0.0 In
06:00

S
S

 3 / 7 mph 52 / 52°F 94% 1014 mb
Low level cloud: 21%
Mid level cloud: 73%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

N
N

 2 / 3 mph 63 / 63°F 61% 1018 mb
Low level cloud: 70%
Mid level cloud: 22%
High level cloud: 97%
Most Significant Cloud Type: low
89%
0.0 In
18:00

SW
SW

 5 / 11 mph 58 / 58°F 84% 1015 mb
Low level cloud: 0%
Mid level cloud: 74%
High level cloud: 82%
Most Significant Cloud Type: medium
77%
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