Weather2 on Twitter Weather2 on Facebook Weather2 on YouTube Weather2 blog

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Hough Side 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Hough Side

Kirklees, United Kingdom

Long range weather outlook for Hough Side includes 14 day forecast summary:

Over the next 14 days the Hough Side forecast suggests the average daytime maximum temperature will be around 12°C, with a high for the two weeks of 17°C expected on the afternoon of Wednesday 24th. The mean minimum temperature will be 7°C, dipping to its lowest on the morning of Saturday 27th at 1°C. The next 14 days will remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 20
Oct
18:00

WSW
WSW

9 / 11 mph 61 / 61°F 83% 1029 mb
Low level cloud: 2%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: medium
18%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

10 / 12 mph 58 / 56°F 85% 1028 mb
Low level cloud: 3%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 21
Oct
00:00

WSW
WSW

7 / 11 mph 54 / 52°F 89% 1028 mb
Low level cloud: 24%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

SW
SW

6 / 11 mph 53 / 52°F 91% 1027 mb
Low level cloud: 41%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
45%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WSW
WSW

8 / 13 mph 53 / 50°F 90% 1026 mb
Low level cloud: 17%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WSW
WSW

11 / 15 mph 57 / 54°F 82% 1025 mb
Low level cloud: 14%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
86%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

11 / 17 mph 58 / 55°F 85% 1025 mb
Low level cloud: 26%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WNW
WNW

11 / 16 mph 59 / 56°F 85% 1026 mb
Low level cloud: 23%
Mid level cloud: 41%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

NW
NW

9 / 12 mph 54 / 51°F 74% 1029 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NW
NW

10 / 13 mph 50 / 46°F 79% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 22
Oct
00:00

NW
NW

8 / 9 mph 48 / 45°F 72% 1035 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NW
NW

8 / 13 mph 45 / 41°F 70% 1036 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NW
NW

8 / 13 mph 44 / 40°F 69% 1038 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NW
NW

8 / 11 mph 47 / 43°F 60% 1039 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WNW
WNW

9 / 10 mph 53 / 49°F 56% 1039 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
1%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WNW
WNW

11 / 13 mph 53 / 49°F 63% 1038 mb
Low level cloud: 29%
Mid level cloud: 5%
High level cloud: 9%
Most Significant Cloud Type: low
31%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

W
W

11 / 16 mph 49 / 44°F 73% 1038 mb
Low level cloud: 10%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: low
12%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

14 / 23 mph 49 / 43°F 79% 1037 mb
Low level cloud: 20%
Mid level cloud: 22%
High level cloud: 13%
Most Significant Cloud Type: low
29%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Tue 23
Oct
00:00

W
W

16 / 26 mph 49 / 44°F 80% 1035 mb
Low level cloud: 30%
Mid level cloud: 22%
High level cloud: 4%
Most Significant Cloud Type: low
37%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

17 / 26 mph 50 / 44°F 80% 1034 mb
Low level cloud: 39%
Mid level cloud: 17%
High level cloud: 15%
Most Significant Cloud Type: low
47%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

17 / 26 mph 50 / 45°F 78% 1032 mb
Low level cloud: 25%
Mid level cloud: 25%
High level cloud: 6%
Most Significant Cloud Type: low
34%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

21 / 30 mph 53 / 47°F 71% 1031 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 7%
Most Significant Cloud Type: medium
26%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

W
W

19 / 24 mph 57 / 53°F 65% 1030 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

W
W

20 / 27 mph 57 / 52°F 71% 1029 mb
Low level cloud: 44%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
50%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

W
W

19 / 30 mph 55 / 51°F 78% 1029 mb
Low level cloud: 38%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WNW
WNW

18 / 29 mph 56 / 51°F 81% 1029 mb
Low level cloud: 12%
Mid level cloud: 14%
High level cloud: 7%
Most Significant Cloud Type: low
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 24
Oct
00:00

WNW
WNW

17 / 27 mph 57 / 53°F 84% 1030 mb
Low level cloud: 26%
Mid level cloud: 15%
High level cloud: 7%
Most Significant Cloud Type: low
32%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WNW
WNW

15 / 24 mph 57 / 53°F 86% 1030 mb
Low level cloud: 27%
Mid level cloud: 9%
High level cloud: 32%
Most Significant Cloud Type: low
33%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

WNW
WNW

11 / 18 mph 56 / 53°F 88% 1030 mb
Low level cloud: 9%
Mid level cloud: 8%
High level cloud: 39%
Most Significant Cloud Type: low
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WNW
WNW

11 / 15 mph 58 / 55°F 81% 1031 mb
Low level cloud: 4%
Mid level cloud: 15%
High level cloud: 15%
Most Significant Cloud Type: medium
25%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WNW
WNW

10 / 12 mph 63 / 63°F 73% 1031 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 22%
Most Significant Cloud Type: medium
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

W
W

11 / 13 mph 62 / 61°F 77% 1030 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 65%
Most Significant Cloud Type: medium
13%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

W
W

12 / 15 mph 55 / 52°F 83% 1029 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

12 / 18 mph 51 / 47°F 79% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 21%
Most Significant Cloud Type: high
21%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 25
Oct
00:00

W
W

11 / 15 mph 50 / 46°F 82% 1028 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

9 / 13 mph 48 / 44°F 84% 1027 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

8 / 13 mph 47 / 42°F 87% 1025 mb
Low level cloud: 8%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WNW
WNW

10 / 13 mph 49 / 45°F 79% 1025 mb
Low level cloud: 1%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: medium
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WNW
WNW

11 / 13 mph 55 / 51°F 67% 1024 mb
Low level cloud: 7%
Mid level cloud: 7%
High level cloud: 18%
Most Significant Cloud Type: low
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WNW
WNW

12 / 14 mph 54 / 50°F 70% 1022 mb
Low level cloud: 19%
Mid level cloud: 9%
High level cloud: 6%
Most Significant Cloud Type: low
23%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

W
W

10 / 15 mph 49 / 45°F 80% 1020 mb
Low level cloud: 32%
Mid level cloud: 53%
High level cloud: 32%
Most Significant Cloud Type: low
54%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

W
W

11 / 16 mph 50 / 45°F 77% 1019 mb
Low level cloud: 25%
Mid level cloud: 86%
High level cloud: 88%
Most Significant Cloud Type: medium
100%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Fri 26
Oct
00:00

W
W

11 / 17 mph 50 / 45°F 79% 1016 mb
Low level cloud: 69%
Mid level cloud: 6%
High level cloud: 33%
Most Significant Cloud Type: low
75%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

13 / 21 mph 49 / 44°F 80% 1013 mb
Low level cloud: 16%
Mid level cloud: 23%
High level cloud: 3%
Most Significant Cloud Type: low
24%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NW
NW

12 / 17 mph 49 / 44°F 74% 1013 mb
Low level cloud: 1%
Mid level cloud: 82%
High level cloud: 0%
Most Significant Cloud Type: medium
85%
Expect 0.02 In of precipitation over the past 3 hours.
0.02 In
09:00

NW
NW

13 / 15 mph 46 / 40°F 67% 1013 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

NNW
NNW

13 / 15 mph 49 / 44°F 57% 1013 mb
Low level cloud: 5%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

NNW
NNW

14 / 17 mph 49 / 43°F 59% 1014 mb
Low level cloud: 27%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.01 In of precipitation over the past 3 hours.
0.01 In
18:00

NNW
NNW

12 / 17 mph 44 / 38°F 65% 1015 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

NNW
NNW

15 / 22 mph 41 / 34°F 65% 1016 mb
Low level cloud: 4%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
40%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 27
Oct
00:00

NW
NW

6 / 7 mph 47 / 44°F 74% 1039 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 1%
Most Significant Cloud Type: medium
1%
0.00 In
06:00

NNW
NNW

14 / 23 mph 39 / 31°F 65% 1034 mb
Low level cloud: 52%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.00 In
12:00

NNW
NNW

10 / 11 mph 50 / 46°F 60% 1039 mb
Low level cloud: 25%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
26%
0.00 In
18:00

NNW
NNW

11 / 13 mph 46 / 40°F 62% 1039 mb
Low level cloud: 7%
Mid level cloud: 4%
High level cloud: 1%
Most Significant Cloud Type: low
8%
0.00 In
Sun 28
Oct
00:00

NW
NW

8 / 10 mph 42 / 37°F 69% 1041 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 21%
Most Significant Cloud Type: medium
13%
0.00 In
06:00

WNW
WNW

7 / 11 mph 37 / 32°F 67% 1035 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 94%
Most Significant Cloud Type: medium
47%
0.00 In
12:00

NNW
NNW

12 / 14 mph 43 / 36°F 54% 1037 mb
Low level cloud: 7%
Mid level cloud: 60%
High level cloud: 7%
Most Significant Cloud Type: medium
79%
0.00 In
18:00

NNW
NNW

7 / 8 mph 51 / 49°F 76% 1033 mb
Low level cloud: 11%
Mid level cloud: 10%
High level cloud: 21%
Most Significant Cloud Type: low
17%
0.00 In
Mon 29
Oct
00:00

N
N

12 / 20 mph 40 / 33°F 75% 1025 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.00 In
06:00

SW
SW

8 / 13 mph 40 / 35°F 76% 1029 mb
Low level cloud: 16%
Mid level cloud: 46%
High level cloud: 84%
Most Significant Cloud Type: medium
93%
0.00 In
12:00

NNE
NNE

10 / 11 mph 47 / 42°F 66% 1025 mb
Low level cloud: 50%
Mid level cloud: 21%
High level cloud: 50%
Most Significant Cloud Type: low
63%
0.00 In
18:00

SW
SW

10 / 15 mph 48 / 44°F 83% 1024 mb
Low level cloud: 34%
Mid level cloud: 45%
High level cloud: 43%
Most Significant Cloud Type: low
54%
0.00 In
Tue 30
Oct
00:00

NNW
NNW

4 / 6 mph 41 / 37°F 77% 1023 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 74%
Most Significant Cloud Type: medium
49%
0.00 In
06:00

SW
SW

12 / 23 mph 45 / 39°F 87% 1019 mb
Low level cloud: 54%
Mid level cloud: 44%
High level cloud: 87%
Most Significant Cloud Type: low
80%
0.00 In
12:00

NW
NW

2 / 2 mph 48 / 47°F 58% 1020 mb
Low level cloud: 0%
Mid level cloud: 81%
High level cloud: 84%
Most Significant Cloud Type: medium
84%
0.00 In
18:00

SW
SW

16 / 21 mph 52 / 46°F 81% 1013 mb
Low level cloud: 33%
Mid level cloud: 10%
High level cloud: 2%
Most Significant Cloud Type: low
36%
0.00 In
Wed 31
Oct
00:00

SW
SW

5 / 8 mph 38 / 34°F 79% 1016 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 62%
Most Significant Cloud Type: medium
48%
0.00 In
06:00

W
W

9 / 12 mph 50 / 46°F 90% 1008 mb
Low level cloud: 61%
Mid level cloud: 51%
High level cloud: 46%
Most Significant Cloud Type: low
84%
0.13 In
12:00

SSW
SSW

13 / 16 mph 43 / 36°F 84% 1010 mb
Low level cloud: 63%
Mid level cloud: 43%
High level cloud: 65%
Most Significant Cloud Type: low
85%
0.04 In
18:00

WSW
WSW

7 / 10 mph 46 / 42°F 76% 1013 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.05 In
Thu 01
Nov
00:00

WSW
WSW

10 / 18 mph 41 / 35°F 90% 1007 mb
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 3%
Most Significant Cloud Type: medium
88%
0.10 In
06:00

WSW
WSW

10 / 17 mph 41 / 35°F 85% 1012 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 8%
Most Significant Cloud Type: medium
6%
0.00 In
12:00

SSW
SSW

17 / 21 mph 49 / 43°F 86% 1003 mb
Low level cloud: 69%
Mid level cloud: 48%
High level cloud: 55%
Most Significant Cloud Type: low
92%
0.04 In
18:00

SW
SW

6 / 11 mph 44 / 40°F 85% 1013 mb
Low level cloud: 5%
Mid level cloud: 44%
High level cloud: 61%
Most Significant Cloud Type: medium
60%
0.02 In
Fri 02
Nov
00:00

WSW
WSW

21 / 32 mph 54 / 49°F 85% 1001 mb
Low level cloud: 49%
Mid level cloud: 19%
High level cloud: 42%
Most Significant Cloud Type: low
60%
0.13 In
06:00

WSW
WSW

6 / 11 mph 40 / 36°F 91% 1014 mb
Low level cloud: 10%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.00 In
12:00

SW
SW

8 / 10 mph 53 / 51°F 91% 1002 mb
Low level cloud: 63%
Mid level cloud: 59%
High level cloud: 13%
Most Significant Cloud Type: low
85%
0.12 In
18:00

SSW
SSW

20 / 31 mph 49 / 42°F 86% 1009 mb
Low level cloud: 75%
Mid level cloud: 46%
High level cloud: 63%
Most Significant Cloud Type: low
99%
0.11 In
Sat 03
Nov
00:00

W
W

19 / 34 mph 55 / 50°F 84% 1001 mb
Low level cloud: 49%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
64%
0.22 In
06:00

SSW
SSW

22 / 34 mph 55 / 50°F 84% 1004 mb
Low level cloud: 66%
Mid level cloud: 40%
High level cloud: 41%
Most Significant Cloud Type: low
85%
0.20 In
12:00

WNW
WNW

19 / 24 mph 52 / 47°F 71% 1013 mb
Low level cloud: 19%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.04 In
18:00

SW
SW

23 / 33 mph 57 / 53°F 84% 999 mb
Low level cloud: 75%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: low
90%
0.18 In
Sun 04
Nov
00:00

WNW
WNW

13 / 23 mph 44 / 38°F 76% 1020 mb
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 38%
Most Significant Cloud Type: medium
14%
0.01 In
06:00

SW
SW

12 / 22 mph 48 / 43°F 86% 1000 mb
Low level cloud: 13%
Mid level cloud: 11%
High level cloud: 14%
Most Significant Cloud Type: low
19%
0.05 In
12:00

SSW
SSW

13 / 17 mph 46 / 40°F 86% 1016 mb
Low level cloud: 64%
Mid level cloud: 59%
High level cloud: 36%
Most Significant Cloud Type: low
88%
0.07 In
18:00

SSW
SSW

12 / 14 mph 55 / 52°F 83% 997 mb
Low level cloud: 13%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.01 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