WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Foulden 14 Day Long Range Forecast

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

Norfolk, United Kingdom

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

For Foulden in the coming two weeks the average daytime maximum temperature will be around 17°C, with a high for the two weeks of 20°C expected on the afternoon of Thursday 23rd. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Monday 20th at 7°C. Expect the following 14 days ahead to have some days seeing a little precipitation and some days with rain. The indicators are that Thursday 16th will have the most precipitation with an accumulation of around 13.0mm. On the whole winds are likely to be moderate.

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

SE
SE

8 / 11 mph 63 / 61°F 82% 1006 mb
Low level cloud: 25%
Mid level cloud: 10%
High level cloud: 32%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

6 / 12 mph 54 / 52°F 95% 1007 mb
Low level cloud: 15%
Mid level cloud: 5%
High level cloud: 35%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 16
May
00:00

SE
SE

3 / 6 mph 51 / 51°F 94% 1007 mb
Low level cloud: 6%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ENE
ENE

4 / 8 mph 51 / 50°F 93% 1007 mb
Low level cloud: 10%
Mid level cloud: 85%
High level cloud: 96%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

2 / 4 mph 54 / 53°F 95% 1006 mb
Low level cloud: 40%
Mid level cloud: 99%
High level cloud: 72%
Most Significant Cloud Type: low
83%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

WNW
WNW

6 / 8 mph 53 / 51°F 99% 1006 mb
Low level cloud: 91%
Mid level cloud: 85%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
12:00

WNW
WNW

7 / 9 mph 55 / 53°F 96% 1005 mb
Low level cloud: 98%
Mid level cloud: 45%
High level cloud: 58%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

WSW
WSW

7 / 10 mph 57 / 55°F 94% 1004 mb
Low level cloud: 97%
Mid level cloud: 45%
High level cloud: 47%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

4 / 6 mph 56 / 55°F 98% 1004 mb
Low level cloud: 89%
Mid level cloud: 57%
High level cloud: 74%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

5 / 8 mph 55 / 53°F 99% 1004 mb
Low level cloud: 92%
Mid level cloud: 87%
High level cloud: 48%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Fri 17
May
00:00

SW
SW

11 / 16 mph 53 / 50°F 98% 1005 mb
Low level cloud: 97%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
03:00

SSW
SSW

11 / 19 mph 51 / 46°F 96% 1006 mb
Low level cloud: 53%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

8 / 12 mph 54 / 50°F 93% 1008 mb
Low level cloud: 29%
Mid level cloud: 23%
High level cloud: 10%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

9 / 10 mph 64 / 61°F 76% 1009 mb
Low level cloud: 58%
Mid level cloud: 9%
High level cloud: 6%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

10 / 11 mph 68 / 66°F 60% 1010 mb
Low level cloud: 45%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

7 / 9 mph 67 / 67°F 63% 1010 mb
Low level cloud: 82%
Mid level cloud: 21%
High level cloud: 94%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

6 / 8 mph 66 / 63°F 81% 1011 mb
Low level cloud: 11%
Mid level cloud: 22%
High level cloud: 21%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

6 / 12 mph 55 / 54°F 94% 1013 mb
Low level cloud: 6%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: medium
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May
00:00

SSE
SSE

4 / 7 mph 53 / 53°F 92% 1013 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

2 / 4 mph 52 / 53°F 91% 1013 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 19%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

4 / 6 mph 56 / 54°F 86% 1014 mb
Low level cloud: 12%
Mid level cloud: 13%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

8 / 10 mph 64 / 62°F 74% 1014 mb
Low level cloud: 59%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

12 / 14 mph 66 / 65°F 64% 1014 mb
Low level cloud: 27%
Mid level cloud: 12%
High level cloud: 2%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

14 / 16 mph 65 / 63°F 69% 1014 mb
Low level cloud: 31%
Mid level cloud: 8%
High level cloud: 14%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

11 / 15 mph 59 / 56°F 82% 1014 mb
Low level cloud: 5%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

8 / 14 mph 50 / 47°F 97% 1015 mb
Low level cloud: 47%
Mid level cloud: 16%
High level cloud: 2%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

NNW
NNW

8 / 13 mph 49 / 46°F 97% 1015 mb
Low level cloud: 68%
Mid level cloud: 31%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

9 / 13 mph 51 / 48°F 96% 1015 mb
Low level cloud: 85%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

11 / 14 mph 54 / 49°F 91% 1015 mb
Low level cloud: 53%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

12 / 14 mph 62 / 61°F 75% 1016 mb
Low level cloud: 35%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

16 / 18 mph 63 / 62°F 70% 1016 mb
Low level cloud: 9%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

17 / 19 mph 62 / 61°F 71% 1017 mb
Low level cloud: 11%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

15 / 19 mph 55 / 49°F 87% 1017 mb
Low level cloud: 50%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

14 / 19 mph 50 / 46°F 81% 1019 mb
Low level cloud: 100%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May
00:00

NNE
NNE

12 / 17 mph 50 / 46°F 81% 1019 mb
Low level cloud: 97%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

8 / 14 mph 46 / 42°F 94% 1019 mb
Low level cloud: 34%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

12 / 16 mph 49 / 44°F 84% 1019 mb
Low level cloud: 10%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

13 / 15 mph 56 / 51°F 65% 1019 mb
Low level cloud: 1%
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
12:00

NNE
NNE

13 / 15 mph 59 / 55°F 58% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

13 / 15 mph 57 / 53°F 61% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

11 / 15 mph 53 / 48°F 77% 1018 mb
Low level cloud: 27%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 11 mph 50 / 47°F 78% 1018 mb
Low level cloud: 82%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

NNE
NNE

4 / 6 mph 51 / 50°F 75% 1017 mb
Low level cloud: 49%
Mid level cloud: 16%
High level cloud: 12%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

5 / 9 mph 48 / 46°F 84% 1016 mb
Low level cloud: 3%
Mid level cloud: 100%
High level cloud: 28%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

6 / 9 mph 50 / 47°F 83% 1016 mb
Low level cloud: 1%
Mid level cloud: 19%
High level cloud: 28%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

9 / 10 mph 59 / 57°F 71% 1015 mb
Low level cloud: 68%
Mid level cloud: 72%
High level cloud: 21%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ENE
ENE

11 / 13 mph 62 / 62°F 76% 1014 mb
Low level cloud: 93%
Mid level cloud: 44%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

13 / 16 mph 58 / 55°F 80% 1014 mb
Low level cloud: 95%
Mid level cloud: 46%
High level cloud: 36%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ENE
ENE

10 / 14 mph 56 / 53°F 83% 1014 mb
Low level cloud: 78%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

9 / 13 mph 53 / 50°F 85% 1014 mb
Low level cloud: 86%
Mid level cloud: 39%
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 22
May
00:00

SSW
SSW

10 / 21 mph 52 / 48°F 97% 1008 mb
Low level cloud: 63%
Mid level cloud: 24%
High level cloud: 22%
Most Significant Cloud Type: low
73%
0.0 In
06:00

NNW
NNW

9 / 18 mph 49 / 45°F 89% 1012 mb
Low level cloud: 95%
Mid level cloud: 62%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NE
NE

10 / 21 mph 57 / 55°F 97% 1010 mb
Low level cloud: 100%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

NNW
NNW

11 / 23 mph 58 / 55°F 93% 1012 mb
Low level cloud: 97%
Mid level cloud: 14%
High level cloud: 15%
Most Significant Cloud Type: low
100%
0.0 In
Thu 23
May
00:00

NNW
NNW

5 / 11 mph 54 / 53°F 97% 1013 mb
Low level cloud: 54%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
06:00

S
S

7 / 15 mph 55 / 53°F 90% 1021 mb
Low level cloud: 27%
Mid level cloud: 17%
High level cloud: 32%
Most Significant Cloud Type: low
37%
0.0 In
12:00

NNE
NNE

21 / 39 mph 55 / 50°F 96% 1018 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.0 In
18:00

ENE
ENE

10 / 17 mph 67 / 67°F 77% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Fri 24
May
00:00

NE
NE

11 / 21 mph 53 / 50°F 96% 1020 mb
Low level cloud: 87%
Mid level cloud: 56%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

NNE
NNE

10 / 18 mph 54 / 51°F 89% 1018 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
12:00

ENE
ENE

13 / 24 mph 70 / 70°F 76% 1021 mb
Low level cloud: 57%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.0 In
18:00

NNE
NNE

11 / 21 mph 59 / 59°F 77% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
33%
0.0 In
Sat 25
May
00:00

E
E

5 / 11 mph 53 / 52°F 96% 1022 mb
Low level cloud: 23%
Mid level cloud: 18%
High level cloud: 21%
Most Significant Cloud Type: low
31%
0.0 In
06:00

NNE
NNE

8 / 14 mph 51 / 49°F 87% 1019 mb
Low level cloud: 7%
Mid level cloud: 15%
High level cloud: 34%
Most Significant Cloud Type: low
16%
0.0 In
12:00

SSW
SSW

4 / 7 mph 69 / 69°F 76% 1019 mb
Low level cloud: 94%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
18:00

NNE
NNE

8 / 14 mph 56 / 55°F 65% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Sun 26
May
00:00

ENE
ENE

5 / 11 mph 59 / 58°F 95% 1019 mb
Low level cloud: 15%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
06:00

N
N

6 / 10 mph 53 / 51°F 84% 1017 mb
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
12:00

ENE
ENE

13 / 26 mph 71 / 71°F 72% 1018 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.1 In
18:00

SSE
SSE

3 / 6 mph 67 / 67°F 68% 1016 mb
Low level cloud: 77%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: low
78%
0.0 In
Mon 27
May
00:00

ENE
ENE

11 / 23 mph 53 / 49°F 88% 1020 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

WNW
WNW

7 / 13 mph 51 / 48°F 79% 1017 mb
Low level cloud: 1%
Mid level cloud: 26%
High level cloud: 95%
Most Significant Cloud Type: medium
33%
0.0 In
12:00

NE
NE

18 / 39 mph 62 / 62°F 62% 1019 mb
Low level cloud: 7%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
7%
0.0 In
18:00

NW
NW

8 / 14 mph 60 / 60°F 76% 1016 mb
Low level cloud: 91%
Mid level cloud: 87%
High level cloud: 7%
Most Significant Cloud Type: low
100%
0.0 In
Tue 28
May
00:00

NE
NE

16 / 33 mph 53 / 48°F 95% 1011 mb
Low level cloud: 100%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
06:00

WNW
WNW

9 / 16 mph 53 / 50°F 86% 1018 mb
Low level cloud: 99%
Mid level cloud: 43%
High level cloud: 35%
Most Significant Cloud Type: low
100%
0.0 In
12:00

E
E

15 / 31 mph 63 / 63°F 86% 1005 mb
Low level cloud: 84%
Mid level cloud: 13%
High level cloud: 34%
Most Significant Cloud Type: low
93%
0.3 In
18:00

NW
NW

7 / 14 mph 58 / 56°F 76% 1019 mb
Low level cloud: 30%
Mid level cloud: 24%
High level cloud: 19%
Most Significant Cloud Type: low
41%
0.1 In
Wed 29
May
00:00

NNW
NNW

5 / 11 mph 57 / 56°F 96% 1008 mb
Low level cloud: 81%
Mid level cloud: 78%
High level cloud: 92%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WSW
WSW

10 / 19 mph 49 / 45°F 85% 1018 mb
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
51%
0.0 In
12:00

SSW
SSW

3 / 6 mph 68 / 68°F 79% 1006 mb
Low level cloud: 98%
Mid level cloud: 26%
High level cloud: 17%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

13 / 26 mph 58 / 56°F 69% 1014 mb
Low level cloud: 21%
Mid level cloud: 86%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Thu 30
May
00:00

W
W

5 / 10 mph 60 / 60°F 97% 1006 mb
Low level cloud: 93%
Mid level cloud: 49%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WSW
WSW

13 / 24 mph 52 / 47°F 89% 1013 mb
Low level cloud: 37%
Mid level cloud: 88%
High level cloud: 15%
Most Significant Cloud Type: low
69%
0.0 In
12:00

WNW
WNW

11 / 23 mph 63 / 63°F 90% 1004 mb
Low level cloud: 94%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WNW
WNW

7 / 14 mph 58 / 56°F 74% 1013 mb
Low level cloud: 30%
Mid level cloud: 46%
High level cloud: 86%
Most Significant Cloud Type: low
56%
0.0 In

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