WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Unionville 14 Day Long Range Forecast

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

Missouri, United States Of America

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

The next 14 day outlook for Unionville shows the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 27°C expected on the afternoon of Tuesday 21st. The mean minimum temperature will be 14°C, dipping to its lowest on the morning of Thursday 23rd at 8°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. It looks like Monday 27th will have the most precipitation with an accumulation of around 12.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Fri 17
May
00:00

SSW
SSW

3 / 6 mph 62 / 62°F 80% 1008 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

SSW
SSW

4 / 8 mph 57 / 57°F 85% 1008 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

SSW
SSW

3 / 7 mph 60 / 59°F 85% 1009 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

SSE
SSE

3 / 4 mph 73 / 76°F 70% 1008 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

4 / 6 mph 78 / 77°F 53% 1008 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 67%
Most Significant Cloud Type: high
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

4 / 5 mph 80 / 78°F 52% 1007 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 11%
Most Significant Cloud Type: medium
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SSE
SSE

4 / 8 mph 76 / 77°F 71% 1006 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

S
S

9 / 18 mph 64 / 64°F 85% 1007 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
Sat 18
May
18:00

WNW
WNW

6 / 10 mph 78 / 79°F 82% 1010 mb
Low level cloud: 21%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

N
N

7 / 15 mph 67 / 67°F 89% 1013 mb
Low level cloud: 46%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May
00:00

N
N

9 / 18 mph 62 / 62°F 81% 1014 mb
Low level cloud: 20%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

8 / 17 mph 59 / 57°F 81% 1016 mb
Low level cloud: 24%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

ENE
ENE

8 / 17 mph 60 / 57°F 89% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 6%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

ESE
ESE

11 / 15 mph 69 / 68°F 83% 1015 mb
Low level cloud: 9%
Mid level cloud: 3%
High level cloud: 65%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

S
S

7 / 9 mph 75 / 78°F 80% 1014 mb
Low level cloud: 99%
Mid level cloud: 42%
High level cloud: 96%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

11 / 17 mph 79 / 80°F 80% 1011 mb
Low level cloud: 22%
Mid level cloud: 11%
High level cloud: 33%
Most Significant Cloud Type: low
29%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

SE
SE

11 / 18 mph 78 / 79°F 83% 1009 mb
Low level cloud: 2%
Mid level cloud: 21%
High level cloud: 19%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SSE
SSE

10 / 21 mph 70 / 70°F 91% 1010 mb
Low level cloud: 0%
Mid level cloud: 89%
High level cloud: 6%
Most Significant Cloud Type: medium
89%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Mon 20
May
00:00

SSW
SSW

8 / 15 mph 67 / 67°F 92% 1007 mb
Low level cloud: 4%
Mid level cloud: 15%
High level cloud: 32%
Most Significant Cloud Type: medium
27%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
03:00

SW
SW

8 / 15 mph 63 / 63°F 95% 1008 mb
Low level cloud: 14%
Mid level cloud: 43%
High level cloud: 77%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

10 / 18 mph 65 / 63°F 97% 1008 mb
Low level cloud: 48%
Mid level cloud: 6%
High level cloud: 98%
Most Significant Cloud Type: low
62%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SW
SW

13 / 17 mph 67 / 67°F 92% 1010 mb
Low level cloud: 67%
Mid level cloud: 16%
High level cloud: 97%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

11 / 13 mph 78 / 79°F 74% 1009 mb
Low level cloud: 43%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

S
S

8 / 11 mph 77 / 78°F 83% 1008 mb
Low level cloud: 49%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

SE
SE

9 / 15 mph 76 / 78°F 86% 1006 mb
Low level cloud: 44%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

SE
SE

8 / 17 mph 69 / 69°F 95% 1006 mb
Low level cloud: 13%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May
00:00

SSE
SSE

9 / 18 mph 68 / 68°F 96% 1005 mb
Low level cloud: 1%
Mid level cloud: 37%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

11 / 21 mph 68 / 69°F 95% 1004 mb
Low level cloud: 16%
Mid level cloud: 8%
High level cloud: 37%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

18 / 30 mph 70 / 68°F 92% 1002 mb
Low level cloud: 15%
Mid level cloud: 8%
High level cloud: 26%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

SSW
SSW

23 / 31 mph 76 / 79°F 83% 1000 mb
Low level cloud: 14%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSW
SSW

22 / 26 mph 80 / 83°F 81% 999 mb
Low level cloud: 44%
Mid level cloud: 24%
High level cloud: 88%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

20 / 28 mph 81 / 85°F 83% 998 mb
Low level cloud: 27%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

17 / 31 mph 77 / 79°F 81% 999 mb
Low level cloud: 1%
Mid level cloud: 8%
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

NW
NW

15 / 24 mph 62 / 62°F 82% 1003 mb
Low level cloud: 3%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May
00:00

NNW
NNW

11 / 17 mph 54 / 51°F 84% 1005 mb
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

6 / 10 mph 50 / 47°F 94% 1006 mb
Low level cloud: 6%
Mid level cloud: 10%
High level cloud: 7%
Most Significant Cloud Type: low
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

9 / 13 mph 52 / 47°F 91% 1007 mb
Low level cloud: 7%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NW
NW

13 / 17 mph 52 / 48°F 91% 1009 mb
Low level cloud: 85%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NW
NW

18 / 21 mph 56 / 52°F 77% 1010 mb
Low level cloud: 63%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

13 / 18 mph 62 / 60°F 71% 1011 mb
Low level cloud: 28%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

10 / 16 mph 62 / 61°F 75% 1012 mb
Low level cloud: 1%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

7 / 15 mph 53 / 51°F 88% 1014 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
Thu 23
May
00:00

W
W

6 / 13 mph 51 / 48°F 83% 1016 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

4 / 7 mph 49 / 48°F 84% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 12%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

4 / 7 mph 52 / 50°F 82% 1017 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
09:00

SW
SW

7 / 8 mph 63 / 61°F 71% 1017 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
12:00

SW
SW

8 / 9 mph 70 / 68°F 64% 1017 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
15:00

SSW
SSW

10 / 12 mph 72 / 76°F 63% 1015 mb
Low level cloud: 41%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

S
S

8 / 13 mph 69 / 67°F 78% 1014 mb
Low level cloud: 0%
Mid level cloud: 1%
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

S
S

7 / 15 mph 59 / 58°F 90% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
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 24
May
00:00

SSE
SSE

12 / 26 mph 66 / 66°F 96% 1014 mb
Low level cloud: 65%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
75%
0.0 In
06:00

ENE
ENE

12 / 24 mph 62 / 62°F 99% 1006 mb
Low level cloud: 95%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
12:00

SSW
SSW

16 / 33 mph 74 / 78°F 89% 1001 mb
Low level cloud: 86%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.0 In
18:00

NW
NW

12 / 26 mph 65 / 65°F 87% 1007 mb
Low level cloud: 14%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
Sat 25
May
00:00

S
S

20 / 41 mph 73 / 77°F 78% 1001 mb
Low level cloud: 2%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.0 In
06:00

SSW
SSW

7 / 15 mph 64 / 64°F 99% 1004 mb
Low level cloud: 93%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

S
S

13 / 27 mph 72 / 76°F 92% 1005 mb
Low level cloud: 60%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
77%
0.0 In
18:00

SSE
SSE

16 / 33 mph 69 / 69°F 91% 1005 mb
Low level cloud: 31%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: low
50%
0.0 In
Sun 26
May
00:00

NNW
NNW

5 / 10 mph 55 / 55°F 89% 1012 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
13%
0.0 In
06:00

S
S

8 / 17 mph 66 / 66°F 99% 1006 mb
Low level cloud: 98%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
100%
1.5 In
12:00

ESE
ESE

14 / 30 mph 67 / 67°F 88% 1010 mb
Low level cloud: 100%
Mid level cloud: 11%
High level cloud: 29%
Most Significant Cloud Type: low
100%
0.1 In
18:00

NNW
NNW

9 / 18 mph 72 / 76°F 83% 1009 mb
Low level cloud: 2%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
2%
0.2 In
Mon 27
May
00:00

SSW
SSW

6 / 14 mph 64 / 64°F 95% 1006 mb
Low level cloud: 15%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: low
29%
0.5 In
06:00

ENE
ENE

5 / 10 mph 56 / 56°F 81% 1015 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 10%
Most Significant Cloud Type: medium
28%
0.0 In
12:00

NW
NW

8 / 17 mph 65 / 65°F 96% 1005 mb
Low level cloud: 100%
Mid level cloud: 74%
High level cloud: 69%
Most Significant Cloud Type: low
100%
0.2 In
18:00

ENE
ENE

4 / 9 mph 71 / 71°F 76% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 15%
Most Significant Cloud Type: medium
6%
0.0 In
Tue 28
May
00:00

WNW
WNW

11 / 23 mph 57 / 55°F 97% 1009 mb
Low level cloud: 49%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
52%
0.2 In
06:00

NNE
NNE

6 / 12 mph 59 / 59°F 89% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 89%
Most Significant Cloud Type: medium
8%
0.0 In
12:00

W
W

14 / 29 mph 71 / 71°F 66% 1013 mb
Low level cloud: 30%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
31%
0.0 In
18:00

NE
NE

9 / 18 mph 69 / 69°F 80% 1015 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 13%
Most Significant Cloud Type: medium
8%
0.0 In
Wed 29
May
00:00

SSE
SSE

4 / 8 mph 62 / 62°F 91% 1014 mb
Low level cloud: 8%
Mid level cloud: 21%
High level cloud: 8%
Most Significant Cloud Type: low
16%
0.0 In
06:00

NNE
NNE

10 / 21 mph 56 / 53°F 93% 1018 mb
Low level cloud: 8%
Mid level cloud: 78%
High level cloud: 81%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

SE
SE

15 / 30 mph 70 / 70°F 80% 1012 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 84%
Most Significant Cloud Type: medium
9%
0.1 In
18:00

NNW
NNW

5 / 11 mph 61 / 60°F 82% 1017 mb
Low level cloud: 20%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
Thu 30
May
00:00

ESE
ESE

7 / 16 mph 62 / 62°F 97% 1012 mb
Low level cloud: 56%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
83%
2.1 In
06:00

WNW
WNW

8 / 16 mph 53 / 51°F 95% 1017 mb
Low level cloud: 8%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.0 In
12:00

ESE
ESE

13 / 27 mph 71 / 71°F 91% 1014 mb
Low level cloud: 90%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.5 In
18:00

NW
NW

12 / 24 mph 65 / 65°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 7%
Most Significant Cloud Type: medium
27%
0.0 In
Fri 31
May
00:00

ESE
ESE

13 / 26 mph 65 / 65°F 98% 1015 mb
Low level cloud: 100%
Mid level cloud: 52%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
06:00

NNW
NNW

6 / 13 mph 51 / 49°F 96% 1017 mb
Low level cloud: 13%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
12:00

S
S

13 / 28 mph 73 / 77°F 90% 1013 mb
Low level cloud: 20%
Mid level cloud: 37%
High level cloud: 54%
Most Significant Cloud Type: low
39%
2.1 In
18:00

N
N

9 / 19 mph 61 / 61°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 11%
Most Significant Cloud Type: medium
22%
0.0 In
Sat 01
Jun
00:00

N
N

5 / 10 mph 70 / 70°F 98% 1011 mb
Low level cloud: 85%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
94%
0.6 In
06:00

NNW
NNW

8 / 16 mph 49 / 46°F 89% 1025 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
0.0 In
12:00

ENE
ENE

7 / 14 mph 79 / 84°F 76% 1012 mb
Low level cloud: 61%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.0 In
18:00

N
N

2 / 4 mph 67 / 67°F 71% 1023 mb
Low level cloud: 32%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
37%
0.0 In

Other Locations Near to Unionville

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