WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Maltby 14 Day Long Range Forecast

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

Stockton-on-Tees, United Kingdom

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

The forecast for Maltby in the coming two weeks is predicting the average daytime maximum temperature will be around 19°C, with a high for the two weeks of 24°C expected on the afternoon of Monday 19th. The mean minimum temperature will be 7°C, dipping to its lowest on the morning of Saturday 10th at 6°C. The fortnight ahead will remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 10
May
18:00

SE
SE

13 / 19 mph 59 / 56°F 67% 1017 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 6%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

6 / 12 mph 49 / 47°F 76% 1018 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 4%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 11
May
00:00

S
S

4 / 9 mph 47 / 46°F 85% 1018 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

SSE
SSE

4 / 9 mph 44 / 41°F 85% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 8%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

1 / 2 mph 50 / 49°F 79% 1016 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 31%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

6 / 7 mph 63 / 60°F 67% 1015 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 8%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

12 / 14 mph 65 / 64°F 61% 1014 mb
Low level cloud: 7%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

13 / 14 mph 65 / 64°F 59% 1012 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
18:00

ESE
ESE

10 / 12 mph 62 / 61°F 73% 1012 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 4%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

4 / 9 mph 50 / 49°F 88% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 75%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 12
May
00:00

ENE
ENE

1 / 3 mph 47 / 47°F 88% 1012 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 17%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

2 / 4 mph 49 / 49°F 87% 1012 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 9%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NE
NE

2 / 3 mph 54 / 52°F 90% 1012 mb
Low level cloud: 6%
Mid level cloud: 33%
High level cloud: 33%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SE
SE

5 / 6 mph 64 / 62°F 75% 1013 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 13%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

13 / 14 mph 68 / 67°F 61% 1013 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 11%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ESE
ESE

15 / 17 mph 67 / 65°F 64% 1014 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

ESE
ESE

11 / 13 mph 61 / 60°F 74% 1016 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 14%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

ENE
ENE

4 / 8 mph 52 / 49°F 87% 1018 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 13
May
00:00

ENE
ENE

5 / 10 mph 48 / 46°F 91% 1020 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

NE
NE

6 / 12 mph 45 / 42°F 93% 1021 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
06:00

NE
NE

6 / 8 mph 52 / 48°F 87% 1022 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ENE
ENE

10 / 11 mph 59 / 56°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
12:00

ENE
ENE

12 / 14 mph 62 / 61°F 64% 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

ENE
ENE

12 / 14 mph 62 / 61°F 65% 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
18:00

ENE
ENE

10 / 11 mph 61 / 60°F 75% 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
21:00

ENE
ENE

5 / 11 mph 47 / 44°F 92% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 80%
Most Significant Cloud Type: high
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 14
May
00:00

NE
NE

3 / 6 mph 46 / 45°F 91% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 19%
Most Significant Cloud Type: high
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

3 / 6 mph 44 / 43°F 91% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 39%
Most Significant Cloud Type: high
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

3 / 5 mph 49 / 48°F 83% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 95%
Most Significant Cloud Type: high
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NE
NE

6 / 6 mph 59 / 56°F 53% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: high
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NE
NE

8 / 9 mph 63 / 61°F 47% 1025 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 42%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

8 / 9 mph 62 / 61°F 46% 1025 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

7 / 8 mph 60 / 58°F 61% 1025 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
21:00

NNE
NNE

4 / 6 mph 50 / 49°F 79% 1026 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 20%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 15
May
00:00

NNW
NNW

4 / 9 mph 45 / 43°F 80% 1026 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 13%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNW
NNW

4 / 9 mph 44 / 41°F 77% 1026 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 64%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

5 / 8 mph 49 / 46°F 72% 1026 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

9 / 11 mph 58 / 55°F 55% 1027 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

10 / 12 mph 62 / 60°F 47% 1027 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 5%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

10 / 11 mph 61 / 60°F 53% 1027 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
18:00

NNE
NNE

7 / 8 mph 61 / 60°F 64% 1027 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

NNE
NNE

3 / 4 mph 55 / 54°F 78% 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
Fri 16
May
00:00

NW
NW

2 / 5 mph 44 / 43°F 72% 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
03:00

NW
NW

2 / 5 mph 42 / 42°F 66% 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
06:00

NW
NW

3 / 5 mph 50 / 50°F 61% 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

NNE
NNE

6 / 7 mph 62 / 60°F 46% 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
12:00

NE
NE

8 / 9 mph 64 / 63°F 43% 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
15:00

NE
NE

7 / 9 mph 64 / 63°F 43% 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
18:00

ENE
ENE

5 / 5 mph 65 / 62°F 58% 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
21:00

ENE
ENE

2 / 3 mph 58 / 58°F 61% 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
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 17
May
00:00

SSW
SSW

3 / 4 mph 56 / 57°F 83% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
0.0 In
06:00

N
N

3 / 4 mph 55 / 55°F 71% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NNE
NNE

12 / 14 mph 60 / 60°F 63% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NE
NE

5 / 6 mph 68 / 68°F 60% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 18
May
00:00

N
N

5 / 8 mph 53 / 52°F 88% 1035 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 2%
Most Significant Cloud Type: high
2%
0.0 In
06:00

NNW
NNW

10 / 12 mph 49 / 45°F 76% 1024 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
12:00

NNE
NNE

16 / 18 mph 58 / 55°F 71% 1027 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
0.0 In
18:00

NNE
NNE

10 / 11 mph 57 / 55°F 77% 1027 mb
Low level cloud: 19%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
Mon 19
May
00:00

SSW
SSW

6 / 11 mph 55 / 54°F 83% 1029 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 7%
Most Significant Cloud Type: medium
9%
0.0 In
06:00

N
N

9 / 11 mph 51 / 47°F 77% 1028 mb
Low level cloud: 89%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
88%
0.0 In
12:00

SW
SW

5 / 6 mph 75 / 77°F 51% 1027 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: medium
15%
0.0 In
18:00

NE
NE

7 / 8 mph 59 / 59°F 72% 1028 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 2%
Most Significant Cloud Type: medium
4%
0.0 In
Tue 20
May
00:00

SSW
SSW

8 / 16 mph 54 / 51°F 72% 1025 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 12%
Most Significant Cloud Type: medium
27%
0.0 In
06:00

S
S

2 / 2 mph 57 / 58°F 69% 1028 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
12:00

WSW
WSW

8 / 11 mph 62 / 62°F 79% 1021 mb
Low level cloud: 83%
Mid level cloud: 61%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSE
SSE

8 / 9 mph 68 / 67°F 70% 1023 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
0.0 In
Wed 21
May
00:00

SW
SW

12 / 17 mph 60 / 60°F 93% 1014 mb
Low level cloud: 91%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.0 In
06:00

S
S

5 / 6 mph 58 / 58°F 81% 1020 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 34%
Most Significant Cloud Type: medium
19%
0.0 In
12:00

W
W

9 / 11 mph 61 / 61°F 74% 1012 mb
Low level cloud: 78%
Mid level cloud: 64%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

9 / 13 mph 64 / 64°F 57% 1017 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
Thu 22
May
00:00

W
W

6 / 9 mph 51 / 49°F 90% 1010 mb
Low level cloud: 4%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: medium
96%
0.2 In
06:00

SSW
SSW

5 / 6 mph 57 / 56°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 17%
Most Significant Cloud Type: medium
15%
0.0 In
12:00

W
W

8 / 10 mph 60 / 60°F 46% 1012 mb
Low level cloud: 0%
Mid level cloud: 59%
High level cloud: 33%
Most Significant Cloud Type: medium
59%
0.0 In
18:00

WSW
WSW

9 / 12 mph 67 / 67°F 64% 1007 mb
Low level cloud: 0%
Mid level cloud: 70%
High level cloud: 85%
Most Significant Cloud Type: medium
73%
0.0 In
Fri 23
May
00:00

SSE
SSE

2 / 2 mph 50 / 50°F 70% 1012 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
06:00

S
S

9 / 13 mph 56 / 54°F 83% 1006 mb
Low level cloud: 52%
Mid level cloud: 68%
High level cloud: 69%
Most Significant Cloud Type: low
83%
0.0 In
12:00

ESE
ESE

13 / 25 mph 55 / 51°F 83% 1011 mb
Low level cloud: 72%
Mid level cloud: 99%
High level cloud: 16%
Most Significant Cloud Type: low
100%
0.2 In
18:00

SSW
SSW

11 / 21 mph 63 / 62°F 77% 1006 mb
Low level cloud: 73%
Mid level cloud: 48%
High level cloud: 32%
Most Significant Cloud Type: low
93%
0.0 In
Sat 24
May
00:00

NNE
NNE

6 / 14 mph 49 / 46°F 95% 1013 mb
Low level cloud: 31%
Mid level cloud: 99%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.1 In
06:00

S
S

13 / 18 mph 58 / 56°F 85% 1007 mb
Low level cloud: 4%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
5%
0.0 In
12:00

NNE
NNE

15 / 31 mph 55 / 52°F 63% 1013 mb
Low level cloud: 4%
Mid level cloud: 48%
High level cloud: 73%
Most Significant Cloud Type: medium
61%
0.0 In
18:00

SW
SW

5 / 7 mph 65 / 65°F 73% 1010 mb
Low level cloud: 21%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
36%
0.0 In
Sun 25
May
00:00

NW
NW

10 / 20 mph 47 / 43°F 81% 1012 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
82%
0.0 In
06:00

NNE
NNE

7 / 10 mph 59 / 58°F 87% 1014 mb
Low level cloud: 18%
Mid level cloud: 46%
High level cloud: 64%
Most Significant Cloud Type: low
41%
0.0 In
12:00

NNE
NNE

5 / 11 mph 57 / 56°F 71% 1009 mb
Low level cloud: 85%
Mid level cloud: 51%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NNE
NNE

11 / 16 mph 58 / 56°F 84% 1014 mb
Low level cloud: 51%
Mid level cloud: 19%
High level cloud: 47%
Most Significant Cloud Type: low
63%
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