WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Caldas Da Rainha 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Caldas Da Rainha

Portugal

Long range weather outlook for Caldas Da Rainha includes 14 day forecast summary:

For Caldas Da Rainha in the coming two weeks the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 28°C expected on the afternoon of Friday 10th. The average minimum temperature will be 14°C, dipping to its lowest on the morning of Friday 3rd at 11°C. Expect the following 14 days ahead to have mostly dry days although Sunday is likely to see a little rain. Current predictions suggest Sunday 5th will have the most precipitation with an accumulation of around 3.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 03
May
18:00

SW
SW

12 / 15 mph 62 / 60°F 72% 1019 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSW
SSW

8 / 14 mph 55 / 53°F 89% 1020 mb
Low level cloud: 2%
Mid level cloud: 20%
High level cloud: 32%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 04
May
00:00

S
S

8 / 14 mph 55 / 53°F 92% 1019 mb
Low level cloud: 5%
Mid level cloud: 10%
High level cloud: 2%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

8 / 15 mph 53 / 51°F 93% 1018 mb
Low level cloud: 11%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSE
SSE

8 / 15 mph 53 / 50°F 94% 1018 mb
Low level cloud: 20%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

13 / 15 mph 65 / 64°F 73% 1019 mb
Low level cloud: 41%
Mid level cloud: 11%
High level cloud: 3%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

16 / 18 mph 67 / 67°F 71% 1018 mb
Low level cloud: 95%
Mid level cloud: 70%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

14 / 18 mph 64 / 64°F 84% 1018 mb
Low level cloud: 96%
Mid level cloud: 61%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SW
SW

12 / 16 mph 63 / 62°F 92% 1018 mb
Low level cloud: 80%
Mid level cloud: 13%
High level cloud: 87%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SW
SW

9 / 13 mph 60 / 60°F 96% 1018 mb
Low level cloud: 73%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 05
May
00:00

SW
SW

8 / 13 mph 60 / 60°F 94% 1017 mb
Low level cloud: 56%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSW
SSW

8 / 13 mph 59 / 57°F 97% 1016 mb
Low level cloud: 67%
Mid level cloud: 15%
High level cloud: 100%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

8 / 13 mph 58 / 57°F 97% 1016 mb
Low level cloud: 63%
Mid level cloud: 41%
High level cloud: 32%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SW
SW

14 / 18 mph 66 / 64°F 82% 1016 mb
Low level cloud: 46%
Mid level cloud: 43%
High level cloud: 7%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SW
SW

16 / 20 mph 69 / 67°F 73% 1015 mb
Low level cloud: 40%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

14 / 21 mph 63 / 63°F 87% 1014 mb
Low level cloud: 91%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

10 / 13 mph 64 / 62°F 89% 1014 mb
Low level cloud: 37%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

6 / 10 mph 58 / 57°F 96% 1015 mb
Low level cloud: 55%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 06
May
00:00

WNW
WNW

6 / 10 mph 57 / 56°F 96% 1015 mb
Low level cloud: 49%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

6 / 10 mph 56 / 55°F 95% 1015 mb
Low level cloud: 56%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNE
NNE

6 / 10 mph 55 / 54°F 94% 1016 mb
Low level cloud: 41%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

10 / 11 mph 61 / 60°F 73% 1018 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

11 / 13 mph 64 / 63°F 57% 1018 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

NNW
NNW

15 / 17 mph 63 / 62°F 59% 1019 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

N
N

14 / 17 mph 60 / 59°F 66% 1019 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

N
N

11 / 18 mph 54 / 51°F 80% 1020 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
Tue 07
May
00:00

N
N

12 / 20 mph 54 / 50°F 81% 1020 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

N
N

11 / 19 mph 53 / 50°F 85% 1021 mb
Low level cloud: 1%
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

NNE
NNE

12 / 20 mph 54 / 50°F 89% 1020 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

10 / 12 mph 64 / 62°F 65% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

11 / 13 mph 69 / 67°F 56% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: high
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

12 / 13 mph 67 / 66°F 61% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 20%
Most Significant Cloud Type: high
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

10 / 13 mph 62 / 61°F 72% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 78%
Most Significant Cloud Type: high
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

8 / 17 mph 56 / 55°F 82% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 08
May
00:00

NNE
NNE

6 / 13 mph 56 / 55°F 84% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 21%
Most Significant Cloud Type: high
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NE
NE

3 / 7 mph 56 / 56°F 77% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 13%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

E
E

5 / 10 mph 56 / 56°F 67% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

9 / 13 mph 70 / 68°F 50% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

10 / 13 mph 79 / 78°F 39% 1018 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 25%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

ENE
ENE

6 / 9 mph 81 / 78°F 39% 1017 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 94%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

7 / 15 mph 74 / 76°F 58% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 59%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

7 / 14 mph 66 / 66°F 61% 1017 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 09
May
00:00

ENE
ENE

6 / 12 mph 65 / 65°F 58% 1016 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 16%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

E
E

4 / 9 mph 65 / 65°F 54% 1016 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ESE
ESE

6 / 12 mph 64 / 64°F 55% 1016 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

8 / 13 mph 72 / 69°F 53% 1016 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 100%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

ESE
ESE

5 / 7 mph 79 / 77°F 42% 1016 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

5 / 7 mph 79 / 78°F 45% 1015 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 100%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

6 / 11 mph 76 / 77°F 58% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

6 / 12 mph 69 / 69°F 69% 1016 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
Fri 10
May
00:00

N
N

6 / 13 mph 60 / 60°F 91% 1013 mb
Low level cloud: 2%
Mid level cloud: 1%
High level cloud: 74%
Most Significant Cloud Type: medium
8%
0.0 In
06:00

NNE
NNE

5 / 10 mph 61 / 61°F 79% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

N
N

10 / 20 mph 68 / 67°F 67% 1013 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
18:00

NW
NW

9 / 17 mph 68 / 68°F 69% 1014 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 19%
Most Significant Cloud Type: medium
2%
0.0 In
Sat 11
May
00:00

NNW
NNW

8 / 15 mph 57 / 56°F 96% 1015 mb
Low level cloud: 39%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
06:00

NNE
NNE

7 / 14 mph 58 / 57°F 92% 1015 mb
Low level cloud: 6%
Mid level cloud: 11%
High level cloud: 22%
Most Significant Cloud Type: low
12%
0.0 In
12:00

NNW
NNW

10 / 19 mph 70 / 70°F 68% 1018 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 4%
Most Significant Cloud Type: medium
3%
0.0 In
18:00

NNW
NNW

13 / 23 mph 69 / 69°F 81% 1016 mb
Low level cloud: 5%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: low
5%
0.0 In
Sun 12
May
00:00

N
N

5 / 11 mph 66 / 66°F 65% 1013 mb
Low level cloud: 0%
Mid level cloud: 34%
High level cloud: 100%
Most Significant Cloud Type: medium
38%
0.0 In
06:00

N
N

9 / 18 mph 57 / 55°F 96% 1018 mb
Low level cloud: 59%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
62%
0.0 In
12:00

N
N

12 / 21 mph 72 / 76°F 62% 1016 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
18:00

N
N

13 / 25 mph 65 / 65°F 77% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 10%
Most Significant Cloud Type: medium
2%
0.0 In
Mon 13
May
00:00

N
N

9 / 17 mph 60 / 60°F 86% 1018 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

N
N

12 / 23 mph 57 / 54°F 89% 1019 mb
Low level cloud: 8%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
12:00

NNW
NNW

14 / 24 mph 72 / 76°F 64% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
9%
0.0 In
18:00

N
N

15 / 28 mph 65 / 65°F 83% 1019 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 88%
Most Significant Cloud Type: low
21%
0.0 In
Tue 14
May
00:00

NNW
NNW

10 / 19 mph 57 / 54°F 91% 1016 mb
Low level cloud: 4%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
4%
0.0 In
06:00

N
N

13 / 25 mph 58 / 55°F 84% 1017 mb
Low level cloud: 9%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
9%
0.0 In
12:00

NNW
NNW

9 / 16 mph 76 / 79°F 63% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
18:00

NNW
NNW

18 / 34 mph 64 / 64°F 70% 1017 mb
Low level cloud: 5%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: low
6%
0.0 In
Wed 15
May
00:00

NNW
NNW

11 / 19 mph 58 / 56°F 85% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
0.0 In
06:00

NNW
NNW

12 / 23 mph 55 / 52°F 77% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
12:00

NW
NW

13 / 23 mph 64 / 64°F 78% 1013 mb
Low level cloud: 34%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
61%
0.0 In
18:00

W
W

13 / 24 mph 62 / 62°F 76% 1013 mb
Low level cloud: 79%
Mid level cloud: 3%
High level cloud: 1%
Most Significant Cloud Type: low
79%
0.0 In
Thu 16
May
00:00

N
N

20 / 37 mph 55 / 50°F 69% 1016 mb
Low level cloud: 13%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: low
13%
0.0 In
06:00

NNW
NNW

15 / 28 mph 55 / 51°F 67% 1017 mb
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 33%
Most Significant Cloud Type: low
40%
0.0 In
12:00

N
N

17 / 31 mph 62 / 62°F 52% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NW
NW

13 / 25 mph 60 / 60°F 65% 1018 mb
Low level cloud: 20%
Mid level cloud: 8%
High level cloud: 21%
Most Significant Cloud Type: low
25%
0.0 In
Fri 17
May
00:00

NNW
NNW

16 / 28 mph 56 / 52°F 74% 1016 mb
Low level cloud: 43%
Mid level cloud: 15%
High level cloud: 94%
Most Significant Cloud Type: low
59%
0.0 In
06:00

WNW
WNW

6 / 12 mph 52 / 51°F 83% 1016 mb
Low level cloud: 79%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
81%
0.0 In
12:00

NNW
NNW

12 / 21 mph 63 / 63°F 58% 1016 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 3%
Most Significant Cloud Type: medium
29%
0.0 In
18:00

WSW
WSW

15 / 29 mph 63 / 64°F 84% 1010 mb
Low level cloud: 91%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Sat 18
May
00:00

N
N

12 / 21 mph 56 / 54°F 90% 1018 mb
Low level cloud: 47%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.0 In
06:00

WNW
WNW

13 / 27 mph 54 / 50°F 85% 1008 mb
Low level cloud: 77%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
84%
0.1 In
12:00

NNW
NNW

13 / 23 mph 66 / 66°F 53% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NW
NW

15 / 31 mph 61 / 61°F 75% 1009 mb
Low level cloud: 37%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.1 In

Other Locations Near to Caldas Da Rainha

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