Fast Forecast

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Acle 14 Day Long Range Forecast

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

Norfolk, United Kingdom

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

The outlook for Acle in the two weeks ahead shows the average daytime maximum temperature will be around 10°C, with a high for the two weeks of 13°C expected on the afternoon of Friday 21st. The average minimum temperature will be 7°C, dipping to its lowest on the morning of Monday 17th at 4°C. The next 14 days will have some days seeing a little precipitation and some days with rain. The current forecast indicates Sunday 23rd will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 17
Mar		21:00

E
E

 18 / 26 mph 42 / 34°F 76% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 18
Mar		00:00

E
E

 15 / 25 mph 42 / 34°F 72% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

ESE
ESE

 14 / 24 mph 40 / 32°F 70% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

 14 / 24 mph 40 / 31°F 71% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

 17 / 24 mph 42 / 33°F 62% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
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

ESE
ESE

 17 / 19 mph 45 / 37°F 57% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 15 / 17 mph 46 / 39°F 59% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

E
E

 14 / 18 mph 45 / 38°F 69% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

 13 / 25 mph 43 / 36°F 72% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 19
Mar		00:00

ESE
ESE

 12 / 23 mph 42 / 36°F 75% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 10 / 18 mph 42 / 36°F 81% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 9 / 15 mph 41 / 36°F 82% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

 9 / 13 mph 45 / 39°F 72% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
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

SSE
SSE

 10 / 13 mph 47 / 43°F 70% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SSE
SSE

 10 / 15 mph 48 / 44°F 73% 1022 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

 9 / 16 mph 45 / 40°F 84% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

 6 / 12 mph 44 / 41°F 83% 1023 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 20
Mar		00:00

SSW
SSW

 4 / 9 mph 44 / 42°F 83% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 14%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

 5 / 11 mph 44 / 41°F 86% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 4%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

 3 / 6 mph 44 / 42°F 86% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

 2 / 3 mph 49 / 48°F 76% 1023 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 4 / 7 mph 53 / 51°F 68% 1022 mb
Low level cloud: 2%
Mid level cloud: 23%
High level cloud: 3%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 9 / 15 mph 53 / 49°F 72% 1021 mb
Low level cloud: 5%
Mid level cloud: 11%
High level cloud: 4%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 8 / 16 mph 48 / 44°F 83% 1021 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 7 / 14 mph 47 / 44°F 87% 1021 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 21
Mar		00:00

ESE
ESE

 8 / 15 mph 48 / 45°F 88% 1019 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 47 / 43°F 88% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

 11 / 24 mph 44 / 38°F 92% 1016 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

 14 / 24 mph 49 / 43°F 88% 1015 mb
Low level cloud: 2%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

 13 / 15 mph 54 / 49°F 83% 1014 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

 11 / 12 mph 56 / 53°F 80% 1011 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 99%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 11 / 15 mph 54 / 49°F 87% 1010 mb
Low level cloud: 4%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ESE
ESE

 8 / 17 mph 50 / 47°F 91% 1008 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 22
Mar		00:00

SE
SE

 12 / 25 mph 49 / 44°F 90% 1007 mb
Low level cloud: 28%
Mid level cloud: 28%
High level cloud: 16%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SE
SE

 12 / 24 mph 47 / 42°F 97% 1005 mb
Low level cloud: 67%
Mid level cloud: 76%
High level cloud: 25%
Most Significant Cloud Type: low
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SE
SE

 15 / 30 mph 46 / 40°F 94% 1004 mb
Low level cloud: 100%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

 17 / 29 mph 49 / 43°F 93% 1003 mb
Low level cloud: 93%
Mid level cloud: 92%
High level cloud: 56%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SE
SE

 19 / 23 mph 52 / 46°F 94% 1002 mb
Low level cloud: 97%
Mid level cloud: 72%
High level cloud: 99%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SE
SE

 16 / 19 mph 53 / 48°F 94% 1001 mb
Low level cloud: 59%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 15 / 21 mph 52 / 47°F 96% 1001 mb
Low level cloud: 49%
Mid level cloud: 69%
High level cloud: 68%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

 14 / 22 mph 50 / 44°F 97% 1001 mb
Low level cloud: 83%
Mid level cloud: 89%
High level cloud: 59%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 23
Mar		00:00

SSE
SSE

 11 / 23 mph 46 / 41°F 96% 1001 mb
Low level cloud: 78%
Mid level cloud: 32%
High level cloud: 72%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

 11 / 22 mph 45 / 40°F 96% 1001 mb
Low level cloud: 52%
Mid level cloud: 15%
High level cloud: 96%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

 11 / 21 mph 45 / 39°F 95% 1002 mb
Low level cloud: 29%
Mid level cloud: 8%
High level cloud: 9%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 9 / 18 mph 47 / 42°F 88% 1003 mb
Low level cloud: 12%
Mid level cloud: 43%
High level cloud: 19%
Most Significant Cloud Type: medium
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

 8 / 13 mph 48 / 44°F 94% 1004 mb
Low level cloud: 95%
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
15:00

S
S

 8 / 13 mph 49 / 45°F 91% 1005 mb
Low level cloud: 92%
Mid level cloud: 58%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

 9 / 15 mph 49 / 44°F 93% 1006 mb
Low level cloud: 47%
Mid level cloud: 44%
High level cloud: 9%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

 8 / 15 mph 47 / 43°F 93% 1007 mb
Low level cloud: 22%
Mid level cloud: 31%
High level cloud: 30%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Mon 24
Mar		00:00

SW
SW

 11 / 20 mph 46 / 41°F 92% 1002 mb
Low level cloud: 19%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: low
35%
0.0 In
06:00

SSE
SSE

 6 / 12 mph 46 / 43°F 95% 1003 mb
Low level cloud: 88%
Mid level cloud: 41%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

 17 / 29 mph 51 / 46°F 80% 1003 mb
Low level cloud: 67%
Mid level cloud: 35%
High level cloud: 100%
Most Significant Cloud Type: low
90%
0.0 In
18:00

W
W

 20 / 23 mph 53 / 48°F 74% 1006 mb
Low level cloud: 96%
Mid level cloud: 69%
High level cloud: 12%
Most Significant Cloud Type: low
100%
0.0 In
Tue 25
Mar		00:00

WSW
WSW

 8 / 16 mph 48 / 44°F 86% 1018 mb
Low level cloud: 7%
Mid level cloud: 46%
High level cloud: 30%
Most Significant Cloud Type: medium
67%
0.0 In
06:00

WNW
WNW

 11 / 19 mph 39 / 32°F 87% 1017 mb
Low level cloud: 1%
Mid level cloud: 22%
High level cloud: 32%
Most Significant Cloud Type: medium
25%
0.0 In
12:00

WSW
WSW

 17 / 26 mph 47 / 40°F 73% 1014 mb
Low level cloud: 92%
Mid level cloud: 69%
High level cloud: 8%
Most Significant Cloud Type: low
100%
0.0 In
18:00

W
W

 5 / 9 mph 53 / 51°F 78% 1018 mb
Low level cloud: 13%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: medium
81%
0.0 In
Wed 26
Mar		00:00

NW
NW

 6 / 9 mph 48 / 45°F 98% 1015 mb
Low level cloud: 93%
Mid level cloud: 48%
High level cloud: 95%
Most Significant Cloud Type: low
100%
0.0 In
06:00

W
W

 11 / 20 mph 49 / 44°F 93% 1018 mb
Low level cloud: 38%
Mid level cloud: 22%
High level cloud: 59%
Most Significant Cloud Type: low
52%
0.0 In
12:00

SSW
SSW

 6 / 10 mph 51 / 49°F 87% 1016 mb
Low level cloud: 99%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WSW
WSW

 9 / 19 mph 55 / 52°F 83% 1016 mb
Low level cloud: 4%
Mid level cloud: 12%
High level cloud: 13%
Most Significant Cloud Type: medium
23%
0.0 In
Thu 27
Mar		00:00

SSW
SSW

 9 / 19 mph 48 / 44°F 94% 1011 mb
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
98%
0.0 In
06:00

SW
SW

 16 / 26 mph 50 / 45°F 92% 1010 mb
Low level cloud: 88%
Mid level cloud: 64%
High level cloud: 33%
Most Significant Cloud Type: low
100%
0.0 In
12:00

S
S

 14 / 21 mph 52 / 48°F 88% 1006 mb
Low level cloud: 80%
Mid level cloud: 44%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.0 In
18:00

WSW
WSW

 12 / 21 mph 45 / 39°F 76% 1009 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 32%
Most Significant Cloud Type: medium
27%
0.3 In
Fri 28
Mar		00:00

SSE
SSE

 15 / 31 mph 47 / 41°F 88% 999 mb
Low level cloud: 65%
Mid level cloud: 67%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
06:00

SSW
SSW

 26 / 54 mph 41 / 30°F 91% 992 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
12:00

SE
SE

 12 / 18 mph 51 / 46°F 85% 996 mb
Low level cloud: 14%
Mid level cloud: 100%
High level cloud: 8%
Most Significant Cloud Type: medium
100%
0.0 In
18:00

W
W

 20 / 29 mph 47 / 40°F 73% 991 mb
Low level cloud: 7%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.2 In
Sat 29
Mar		00:00

ENE
ENE

 8 / 17 mph 45 / 41°F 88% 995 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
0.0 In
06:00

W
W

 25 / 40 mph 42 / 32°F 73% 995 mb
Low level cloud: 60%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
12:00

NNE
NNE

 11 / 18 mph 48 / 43°F 83% 1001 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 17%
Most Significant Cloud Type: medium
11%
0.0 In
18:00

WSW
WSW

 16 / 24 mph 46 / 40°F 75% 998 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
0.0 In
Sun 30
Mar		00:00

NW
NW

 10 / 18 mph 44 / 38°F 87% 1009 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
06:00

W
W

 14 / 21 mph 40 / 33°F 88% 994 mb
Low level cloud: 25%
Mid level cloud: 97%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

WNW
WNW

 7 / 12 mph 48 / 44°F 79% 1013 mb
Low level cloud: 61%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
18:00

WNW
WNW

 15 / 26 mph 45 / 39°F 86% 997 mb
Low level cloud: 81%
Mid level cloud: 46%
High level cloud: 16%
Most Significant Cloud Type: low
98%
0.1 In
Mon 31
Mar		00:00

SSW
SSW

 11 / 21 mph 45 / 40°F 89% 1015 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: low
7%
0.0 In
06:00

WNW
WNW

 14 / 26 mph 38 / 29°F 84% 1006 mb
Low level cloud: 3%
Mid level cloud: 100%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

SSW
SSW

 16 / 31 mph 54 / 49°F 71% 1017 mb
Low level cloud: 62%
Mid level cloud: 24%
High level cloud: 9%
Most Significant Cloud Type: low
71%
0.0 In
18:00

WNW
WNW

 14 / 26 mph 43 / 35°F 66% 1011 mb
Low level cloud: 0%
Mid level cloud: 87%
High level cloud: 0%
Most Significant Cloud Type: medium
87%
0.0 In
Tue 01
Apr		00:00

SSW
SSW

 10 / 20 mph 47 / 42°F 90% 1020 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
36%
0.0 In
06:00

WNW
WNW

 12 / 23 mph 45 / 40°F 83% 1012 mb
Low level cloud: 89%
Mid level cloud: 20%
High level cloud: 17%
Most Significant Cloud Type: low
98%
0.0 In
12:00

ESE
ESE

 9 / 16 mph 51 / 48°F 81% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
5%
0.0 In
18:00

S
S

 26 / 50 mph 46 / 37°F 87% 1000 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
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