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

Ryhill 14 Day Long Range Forecast

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

Barnsley, United Kingdom

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

The next 14 day outlook for Ryhill shows the average daytime maximum temperature will be around 13°C, with a high for the two weeks of 17°C expected on the afternoon of Friday 29th. The average minimum temperature will be 5°C, dipping to its lowest on the morning of Tuesday 2nd at 1°C. Expect the coming 14 days to remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 23
Mar
18:00

NW
NW

5 / 6 mph 53 / 50°F 55% 1033 mb
Low level cloud: 0%
Mid level cloud: 48%
High level cloud: 95%
Most Significant Cloud Type: medium
51%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WNW
WNW

6 / 6 mph 49 / 47°F 62% 1034 mb
Low level cloud: 0%
Mid level cloud: 80%
High level cloud: 94%
Most Significant Cloud Type: medium
83%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Sun 24
Mar
00:00

W
W

4 / 5 mph 45 / 43°F 61% 1034 mb
Low level cloud: 0%
Mid level cloud: 78%
High level cloud: 95%
Most Significant Cloud Type: medium
82%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

5 / 6 mph 44 / 41°F 63% 1032 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

W
W

7 / 9 mph 42 / 37°F 71% 1032 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

11 / 13 mph 47 / 42°F 62% 1031 mb
Low level cloud: 42%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

W
W

15 / 17 mph 51 / 46°F 49% 1030 mb
Low level cloud: 30%
Mid level cloud: 5%
High level cloud: 14%
Most Significant Cloud Type: low
33%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

W
W

16 / 18 mph 50 / 44°F 57% 1029 mb
Low level cloud: 55%
Mid level cloud: 44%
High level cloud: 12%
Most Significant Cloud Type: low
71%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WNW
WNW

15 / 19 mph 48 / 42°F 67% 1028 mb
Low level cloud: 45%
Mid level cloud: 24%
High level cloud: 33%
Most Significant Cloud Type: low
57%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WNW
WNW

15 / 21 mph 45 / 38°F 71% 1029 mb
Low level cloud: 21%
Mid level cloud: 7%
High level cloud: 15%
Most Significant Cloud Type: low
25%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Mon 25
Mar
00:00

NW
NW

15 / 21 mph 43 / 36°F 64% 1030 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

NW
NW

13 / 17 mph 42 / 35°F 64% 1031 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

NW
NW

11 / 15 mph 40 / 33°F 66% 1032 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

NNW
NNW

10 / 11 mph 44 / 39°F 55% 1034 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

NNW
NNW

7 / 8 mph 51 / 47°F 44% 1035 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 12%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

NNW
NNW

5 / 5 mph 55 / 53°F 37% 1035 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 6%
Most Significant Cloud Type: medium
14%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WNW
WNW

6 / 8 mph 52 / 49°F 51% 1035 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 38%
Most Significant Cloud Type: medium
20%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WNW
WNW

6 / 8 mph 46 / 43°F 66% 1037 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 7%
Most Significant Cloud Type: medium
23%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Tue 26
Mar
00:00

W
W

5 / 7 mph 44 / 41°F 76% 1037 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 39%
Most Significant Cloud Type: medium
17%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

6 / 10 mph 42 / 38°F 83% 1036 mb
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 59%
Most Significant Cloud Type: medium
32%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

7 / 11 mph 41 / 37°F 86% 1036 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

W
W

10 / 11 mph 49 / 44°F 74% 1036 mb
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 93%
Most Significant Cloud Type: low
38%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

W
W

12 / 13 mph 54 / 50°F 61% 1035 mb
Low level cloud: 65%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: low
68%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WNW
WNW

13 / 15 mph 56 / 52°F 57% 1034 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WNW
WNW

10 / 12 mph 52 / 48°F 65% 1034 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WNW
WNW

9 / 11 mph 47 / 43°F 78% 1035 mb
Low level cloud: 6%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
8%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Wed 27
Mar
00:00

W
W

9 / 14 mph 45 / 41°F 80% 1035 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

WNW
WNW

9 / 14 mph 44 / 39°F 80% 1035 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

10 / 16 mph 44 / 38°F 82% 1035 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WNW
WNW

11 / 13 mph 51 / 46°F 70% 1036 mb
Low level cloud: 0%
Mid level cloud: 1%
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

10 / 12 mph 57 / 53°F 61% 1036 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 22%
Most Significant Cloud Type: low
5%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WNW
WNW

9 / 10 mph 58 / 56°F 59% 1035 mb
Low level cloud: 3%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: medium
10%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WNW
WNW

8 / 10 mph 54 / 51°F 71% 1035 mb
Low level cloud: 8%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: medium
68%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WNW
WNW

6 / 8 mph 49 / 47°F 81% 1037 mb
Low level cloud: 18%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
Thu 28
Mar
00:00

WNW
WNW

4 / 7 mph 46 / 44°F 84% 1037 mb
Low level cloud: 37%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
03:00

W
W

4 / 6 mph 45 / 43°F 86% 1037 mb
Low level cloud: 13%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
06:00

W
W

3 / 5 mph 43 / 42°F 87% 1036 mb
Low level cloud: 5%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: low
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
09:00

WSW
WSW

3 / 4 mph 51 / 50°F 69% 1036 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 19%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
12:00

WSW
WSW

5 / 6 mph 58 / 57°F 52% 1035 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 93%
Most Significant Cloud Type: medium
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

W
W

6 / 7 mph 60 / 59°F 53% 1032 mb
Low level cloud: 1%
Mid level cloud: 8%
High level cloud: 28%
Most Significant Cloud Type: medium
11%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

W
W

5 / 6 mph 57 / 55°F 64% 1031 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 17%
Most Significant Cloud Type: high
16%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WSW
WSW

5 / 5 mph 54 / 53°F 69% 1032 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
Fri 29
Mar
00:00

SW
SW

4 / 6 mph 48 / 47°F 72% 1031 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
03:00

SW
SW

4 / 8 mph 46 / 44°F 78% 1029 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

SW
SW

6 / 10 mph 44 / 41°F 82% 1028 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

WSW
WSW

7 / 8 mph 53 / 50°F 60% 1028 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

WSW
WSW

9 / 10 mph 60 / 59°F 41% 1026 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
15:00

WSW
WSW

9 / 10 mph 63 / 62°F 43% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
18:00

WSW
WSW

6 / 7 mph 61 / 60°F 58% 1024 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 11%
Most Significant Cloud Type: medium
6%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
21:00

WSW
WSW

4 / 5 mph 54 / 54°F 70% 1024 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 83%
Most Significant Cloud Type: medium
7%
Expect 0.00 In of precipitation over the past 3 hours.
0.00 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 30
Mar
00:00

W
W

7 / 8 mph 52 / 50°F 73% 1021 mb
Low level cloud: 0%
Mid level cloud: 75%
High level cloud: 82%
Most Significant Cloud Type: medium
77%
0.00 In
06:00

SW
SW

6 / 8 mph 53 / 51°F 83% 1015 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 14%
Most Significant Cloud Type: medium
10%
0.00 In
12:00

S
S

15 / 17 mph 65 / 65°F 37% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
18:00

NNW
NNW

11 / 13 mph 54 / 51°F 70% 1016 mb
Low level cloud: 74%
Mid level cloud: 43%
High level cloud: 72%
Most Significant Cloud Type: low
97%
0.01 In
Sun 31
Mar
00:00

S
S

11 / 17 mph 53 / 49°F 69% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 20%
Most Significant Cloud Type: medium
10%
0.00 In
06:00

S
S

8 / 9 mph 51 / 48°F 81% 1018 mb
Low level cloud: 1%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.00 In
12:00

SSW
SSW

12 / 14 mph 58 / 55°F 72% 1015 mb
Low level cloud: 81%
Mid level cloud: 46%
High level cloud: 71%
Most Significant Cloud Type: low
100%
0.02 In
18:00

WSW
WSW

10 / 13 mph 57 / 55°F 76% 1017 mb
Low level cloud: 64%
Mid level cloud: 44%
High level cloud: 54%
Most Significant Cloud Type: low
85%
0.00 In
Mon 01
Apr
00:00

NNW
NNW

3 / 4 mph 49 / 49°F 78% 1018 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.00 In
06:00

NW
NW

5 / 6 mph 49 / 46°F 75% 1023 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
12:00

NNE
NNE

12 / 13 mph 48 / 42°F 64% 1024 mb
Low level cloud: 92%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
93%
0.00 In
18:00

NE
NE

2 / 2 mph 58 / 60°F 50% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 85%
Most Significant Cloud Type: high
85%
0.00 In
Tue 02
Apr
00:00

NE
NE

3 / 4 mph 45 / 44°F 75% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
06:00

SSE
SSE

5 / 7 mph 40 / 37°F 92% 1029 mb
Low level cloud: 20%
Mid level cloud: 0%
High level cloud: 50%
Most Significant Cloud Type: low
26%
0.00 In
12:00

SSE
SSE

2 / 3 mph 57 / 58°F 40% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
3%
0.00 In
18:00

ESE
ESE

9 / 10 mph 54 / 51°F 65% 1026 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 64%
Most Significant Cloud Type: medium
6%
0.00 In
Wed 03
Apr
00:00

SSE
SSE

4 / 4 mph 44 / 42°F 87% 1029 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.00 In
06:00

E
E

6 / 10 mph 39 / 35°F 96% 1021 mb
Low level cloud: 44%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: low
48%
0.00 In
12:00

E
E

9 / 10 mph 54 / 51°F 55% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 11%
Most Significant Cloud Type: high
10%
0.00 In
18:00

E
E

13 / 18 mph 52 / 48°F 67% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 41%
Most Significant Cloud Type: high
40%
0.00 In
Thu 04
Apr
00:00

NE
NE

6 / 10 mph 39 / 34°F 95% 1022 mb
Low level cloud: 59%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
58%
0.00 In
06:00

SE
SE

11 / 17 mph 51 / 47°F 96% 1004 mb
Low level cloud: 87%
Mid level cloud: 34%
High level cloud: 57%
Most Significant Cloud Type: low
100%
0.08 In
12:00

NE
NE

11 / 12 mph 57 / 55°F 73% 1018 mb
Low level cloud: 28%
Mid level cloud: 11%
High level cloud: 35%
Most Significant Cloud Type: low
36%
0.00 In
18:00

SSW
SSW

15 / 21 mph 57 / 53°F 69% 1007 mb
Low level cloud: 22%
Mid level cloud: 15%
High level cloud: 21%
Most Significant Cloud Type: low
29%
0.02 In
Fri 05
Apr
00:00

NNE
NNE

7 / 10 mph 44 / 39°F 95% 1016 mb
Low level cloud: 72%
Mid level cloud: 13%
High level cloud: 37%
Most Significant Cloud Type: low
81%
0.00 In
06:00

SSE
SSE

5 / 8 mph 47 / 45°F 90% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 9%
Most Significant Cloud Type: medium
6%
0.00 In
12:00

NNE
NNE

9 / 10 mph 57 / 54°F 76% 1015 mb
Low level cloud: 61%
Mid level cloud: 44%
High level cloud: 54%
Most Significant Cloud Type: low
82%
0.01 In
18:00

SE
SE

17 / 23 mph 60 / 60°F 72% 1003 mb
Low level cloud: 19%
Mid level cloud: 49%
High level cloud: 49%
Most Significant Cloud Type: low
42%
0.00 In
Sat 06
Apr
00:00

N
N

6 / 7 mph 51 / 48°F 90% 1014 mb
Low level cloud: 70%
Mid level cloud: 20%
High level cloud: 29%
Most Significant Cloud Type: low
80%
0.01 In
06:00

SSE
SSE

10 / 18 mph 47 / 42°F 88% 1003 mb
Low level cloud: 1%
Mid level cloud: 22%
High level cloud: 39%
Most Significant Cloud Type: medium
26%
0.13 In
12:00

WNW
WNW

6 / 6 mph 58 / 57°F 70% 1014 mb
Low level cloud: 65%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.01 In
18:00

WNW
WNW

15 / 28 mph 50 / 45°F 80% 1003 mb
Low level cloud: 54%
Mid level cloud: 46%
High level cloud: 26%
Most Significant Cloud Type: low
73%
0.28 In
Sun 07
Apr
00:00

WNW
WNW

3 / 4 mph 52 / 52°F 89% 1017 mb
Low level cloud: 12%
Mid level cloud: 14%
High level cloud: 8%
Most Significant Cloud Type: low
18%
0.01 In
06:00

S
S

7 / 11 mph 38 / 32°F 84% 1013 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
0.00 In
12:00

ESE
ESE

4 / 5 mph 63 / 63°F 61% 1020 mb
Low level cloud: 72%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
76%
0.00 In
18:00

W
W

14 / 22 mph 43 / 36°F 69% 1011 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
44%
0.23 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