WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Four Lanes 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Four Lanes

Cornwall, United Kingdom

Long range weather outlook for Four Lanes includes 14 day forecast summary:

The outlook for Four Lanes in the two weeks ahead shows 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 Sunday 19th. The average minimum temperature will be 12°C, dipping to its lowest on the morning of Wednesday 22nd at 10°C. The coming 14 days will have some days seeing a little precipitation and some days with rain. The current forecast indicates Wednesday 22nd 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
Wed 15
May
18:00

ESE
ESE

14 / 20 mph 58 / 53°F 86% 1001 mb
Low level cloud: 18%
Mid level cloud: 22%
High level cloud: 16%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

12 / 17 mph 56 / 52°F 90% 1002 mb
Low level cloud: 16%
Mid level cloud: 15%
High level cloud: 8%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May
00:00

ESE
ESE

11 / 17 mph 54 / 51°F 92% 1003 mb
Low level cloud: 18%
Mid level cloud: 11%
High level cloud: 8%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

11 / 17 mph 53 / 49°F 93% 1003 mb
Low level cloud: 29%
Mid level cloud: 10%
High level cloud: 11%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

13 / 22 mph 53 / 47°F 92% 1003 mb
Low level cloud: 36%
Mid level cloud: 42%
High level cloud: 11%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

15 / 25 mph 54 / 49°F 83% 1004 mb
Low level cloud: 9%
Mid level cloud: 9%
High level cloud: 4%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

15 / 21 mph 56 / 52°F 80% 1005 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

E
E

13 / 17 mph 57 / 54°F 78% 1005 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 31%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

10 / 13 mph 57 / 54°F 81% 1006 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 35%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

6 / 9 mph 57 / 54°F 84% 1007 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 33%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 17
May
00:00

ENE
ENE

5 / 8 mph 54 / 53°F 84% 1007 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 9%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

6 / 11 mph 52 / 50°F 83% 1007 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 10%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

8 / 13 mph 53 / 49°F 88% 1008 mb
Low level cloud: 4%
Mid level cloud: 11%
High level cloud: 33%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

4 / 7 mph 58 / 56°F 81% 1009 mb
Low level cloud: 12%
Mid level cloud: 8%
High level cloud: 26%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

3 / 5 mph 58 / 57°F 79% 1010 mb
Low level cloud: 59%
Mid level cloud: 11%
High level cloud: 9%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

2 / 3 mph 58 / 58°F 79% 1011 mb
Low level cloud: 34%
Mid level cloud: 11%
High level cloud: 29%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

6 / 9 mph 58 / 56°F 83% 1011 mb
Low level cloud: 49%
Mid level cloud: 100%
High level cloud: 37%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

7 / 11 mph 56 / 53°F 89% 1013 mb
Low level cloud: 9%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

NNE
NNE

6 / 11 mph 54 / 52°F 89% 1013 mb
Low level cloud: 23%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

6 / 9 mph 53 / 51°F 90% 1014 mb
Low level cloud: 36%
Mid level cloud: 5%
High level cloud: 74%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

6 / 11 mph 55 / 51°F 90% 1014 mb
Low level cloud: 17%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

5 / 8 mph 58 / 56°F 83% 1015 mb
Low level cloud: 11%
Mid level cloud: 6%
High level cloud: 31%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

2 / 2 mph 61 / 58°F 79% 1015 mb
Low level cloud: 41%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

9 / 15 mph 60 / 57°F 81% 1015 mb
Low level cloud: 46%
Mid level cloud: 13%
High level cloud: 35%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

11 / 17 mph 57 / 54°F 87% 1016 mb
Low level cloud: 11%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

12 / 18 mph 54 / 50°F 94% 1016 mb
Low level cloud: 59%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

N
N

9 / 12 mph 56 / 54°F 95% 1016 mb
Low level cloud: 29%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

9 / 15 mph 55 / 52°F 94% 1015 mb
Low level cloud: 17%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

9 / 19 mph 54 / 50°F 94% 1016 mb
Low level cloud: 26%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

9 / 17 mph 58 / 54°F 83% 1017 mb
Low level cloud: 34%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

5 / 7 mph 62 / 61°F 86% 1017 mb
Low level cloud: 74%
Mid level cloud: 24%
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

N
N

7 / 9 mph 66 / 63°F 84% 1016 mb
Low level cloud: 52%
Mid level cloud: 8%
High level cloud: 9%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

7 / 8 mph 62 / 61°F 87% 1016 mb
Low level cloud: 88%
Mid level cloud: 28%
High level cloud: 3%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

6 / 9 mph 60 / 58°F 90% 1017 mb
Low level cloud: 16%
Mid level cloud: 14%
High level cloud: 10%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NE
NE

9 / 15 mph 55 / 53°F 91% 1017 mb
Low level cloud: 3%
Mid level cloud: 1%
High level cloud: 33%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

10 / 17 mph 53 / 49°F 93% 1017 mb
Low level cloud: 25%
Mid level cloud: 20%
High level cloud: 32%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

10 / 18 mph 52 / 47°F 92% 1018 mb
Low level cloud: 33%
Mid level cloud: 18%
High level cloud: 33%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

E
E

11 / 15 mph 56 / 52°F 85% 1018 mb
Low level cloud: 27%
Mid level cloud: 8%
High level cloud: 16%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

E
E

9 / 11 mph 59 / 57°F 81% 1018 mb
Low level cloud: 8%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

7 / 8 mph 62 / 60°F 82% 1017 mb
Low level cloud: 74%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

3 / 4 mph 62 / 59°F 82% 1017 mb
Low level cloud: 69%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

4 / 4 mph 60 / 58°F 87% 1017 mb
Low level cloud: 8%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NNW
NNW

5 / 6 mph 55 / 55°F 89% 1016 mb
Low level cloud: 55%
Mid level cloud: 16%
High level cloud: 7%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

5 / 7 mph 53 / 52°F 86% 1015 mb
Low level cloud: 86%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

7 / 12 mph 53 / 49°F 88% 1014 mb
Low level cloud: 57%
Mid level cloud: 49%
High level cloud: 2%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

14 / 18 mph 55 / 51°F 88% 1014 mb
Low level cloud: 90%
Mid level cloud: 74%
High level cloud: 17%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

11 / 13 mph 59 / 57°F 87% 1014 mb
Low level cloud: 70%
Mid level cloud: 32%
High level cloud: 41%
Most Significant Cloud Type: low
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

6 / 7 mph 64 / 61°F 81% 1013 mb
Low level cloud: 35%
Mid level cloud: 41%
High level cloud: 12%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

5 / 6 mph 62 / 60°F 79% 1013 mb
Low level cloud: 24%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

7 / 9 mph 57 / 55°F 87% 1013 mb
Low level cloud: 61%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
83%
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

WSW
WSW

8 / 17 mph 55 / 53°F 92% 1012 mb
Low level cloud: 21%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
06:00

SSE
SSE

4 / 9 mph 53 / 53°F 89% 1012 mb
Low level cloud: 19%
Mid level cloud: 98%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

NW
NW

11 / 23 mph 58 / 56°F 88% 1013 mb
Low level cloud: 38%
Mid level cloud: 17%
High level cloud: 100%
Most Significant Cloud Type: low
56%
0.0 In
18:00

NNW
NNW

11 / 23 mph 59 / 59°F 84% 1014 mb
Low level cloud: 1%
Mid level cloud: 11%
High level cloud: 11%
Most Significant Cloud Type: medium
15%
0.0 In
Thu 23
May
00:00

NNE
NNE

9 / 19 mph 54 / 52°F 90% 1013 mb
Low level cloud: 4%
Mid level cloud: 33%
High level cloud: 11%
Most Significant Cloud Type: medium
44%
0.0 In
06:00

S
S

14 / 29 mph 53 / 49°F 86% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
12:00

NNW
NNW

19 / 38 mph 53 / 48°F 82% 1024 mb
Low level cloud: 93%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
96%
0.0 In
18:00

N
N

7 / 13 mph 60 / 60°F 90% 1017 mb
Low level cloud: 89%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Fri 24
May
00:00

NNW
NNW

13 / 26 mph 52 / 47°F 95% 1020 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
06:00

E
E

12 / 23 mph 54 / 50°F 96% 1018 mb
Low level cloud: 81%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
12:00

SE
SE

13 / 27 mph 56 / 52°F 93% 1018 mb
Low level cloud: 90%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
18:00

NNW
NNW

7 / 14 mph 60 / 60°F 86% 1018 mb
Low level cloud: 78%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.0 In
Sat 25
May
00:00

SSE
SSE

15 / 30 mph 53 / 48°F 95% 1018 mb
Low level cloud: 74%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
89%
0.0 In
06:00

NNE
NNE

5 / 10 mph 59 / 59°F 89% 1019 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
4%
0.0 In
12:00

SSW
SSW

12 / 24 mph 55 / 52°F 74% 1019 mb
Low level cloud: 4%
Mid level cloud: 33%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
18:00

NNW
NNW

11 / 22 mph 60 / 60°F 81% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
0.0 In
Sun 26
May
00:00

SE
SE

7 / 15 mph 57 / 55°F 88% 1018 mb
Low level cloud: 4%
Mid level cloud: 79%
High level cloud: 3%
Most Significant Cloud Type: medium
90%
0.0 In
06:00

NNW
NNW

7 / 14 mph 54 / 52°F 94% 1018 mb
Low level cloud: 43%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
43%
0.0 In
12:00

NE
NE

9 / 19 mph 60 / 60°F 92% 1016 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNW
NNW

14 / 28 mph 58 / 55°F 83% 1020 mb
Low level cloud: 1%
Mid level cloud: 29%
High level cloud: 32%
Most Significant Cloud Type: medium
31%
0.0 In
Mon 27
May
00:00

ENE
ENE

12 / 25 mph 56 / 53°F 95% 1014 mb
Low level cloud: 27%
Mid level cloud: 14%
High level cloud: 18%
Most Significant Cloud Type: low
33%
0.2 In
06:00

N
N

9 / 19 mph 51 / 47°F 81% 1021 mb
Low level cloud: 24%
Mid level cloud: 0%
High level cloud: 82%
Most Significant Cloud Type: low
33%
0.0 In
12:00

ENE
ENE

19 / 39 mph 59 / 59°F 67% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
0.0 In
18:00

NW
NW

13 / 26 mph 56 / 53°F 81% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 33%
Most Significant Cloud Type: medium
5%
0.0 In
Tue 28
May
00:00

N
N

12 / 24 mph 52 / 47°F 86% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

N
N

13 / 28 mph 53 / 48°F 91% 1023 mb
Low level cloud: 30%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
34%
0.0 In
12:00

N
N

18 / 38 mph 54 / 49°F 83% 1007 mb
Low level cloud: 64%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
73%
0.1 In
18:00

NNW
NNW

14 / 29 mph 56 / 53°F 74% 1025 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 15%
Most Significant Cloud Type: medium
5%
0.0 In
Wed 29
May
00:00

ENE
ENE

11 / 24 mph 53 / 49°F 91% 1005 mb
Low level cloud: 17%
Mid level cloud: 10%
High level cloud: 8%
Most Significant Cloud Type: low
21%
0.1 In
06:00

WNW
WNW

8 / 17 mph 52 / 49°F 89% 1023 mb
Low level cloud: 8%
Mid level cloud: 5%
High level cloud: 19%
Most Significant Cloud Type: low
12%
0.0 In
12:00

ENE
ENE

11 / 23 mph 57 / 55°F 85% 1006 mb
Low level cloud: 46%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
65%
0.0 In
18:00

WNW
WNW

15 / 30 mph 57 / 53°F 80% 1020 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 2%
Most Significant Cloud Type: medium
24%
0.0 In
Thu 30
May
00:00

ENE
ENE

10 / 22 mph 55 / 52°F 90% 1006 mb
Low level cloud: 3%
Mid level cloud: 13%
High level cloud: 8%
Most Significant Cloud Type: medium
20%
0.0 In
06:00

WNW
WNW

14 / 28 mph 53 / 49°F 88% 1018 mb
Low level cloud: 90%
Mid level cloud: 18%
High level cloud: 12%
Most Significant Cloud Type: low
97%
0.0 In
12:00

SE
SE

10 / 21 mph 60 / 60°F 82% 1006 mb
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 20%
Most Significant Cloud Type: medium
5%
0.0 In
18:00

WNW
WNW

13 / 26 mph 58 / 56°F 86% 1017 mb
Low level cloud: 7%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In

Other Locations Near to Four Lanes

The day label given represents the local day relative to the local time for the location you are looking at.
(More Info)

Day

This time is corrected for local time zones and where possible for daylight saving times.
(More Info)

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.
(More Info)

Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
(More Info)

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.
(More Info)

Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
(More Info)

Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
(More Info)

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.
(More Info)

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.
(More Info)

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.
(More Info)

Pressure