Fast Forecast

WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

West Hartford 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for West Hartford

Connecticut, United States Of America

Long range weather outlook for West Hartford includes 14 day forecast summary:

For West Hartford in the coming two weeks the average daytime maximum temperature will be around 28°C, with a high for the two weeks of 36°C expected on the afternoon of Friday 19th. The average minimum temperature will be 15°C, dipping to its lowest on the morning of Wednesday 10th at 11°C. Expect the coming 14 days to have mostly dry days although Wednesday 10th and Saturday 13th are likely to see a little rain. The indicators are that Saturday 13th will have the most precipitation with an accumulation of around 3.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 09
Sep		01:00

N
N

 2 / 4 mph 56 / 56°F 82% 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
04:00

N
N

 4 / 8 mph 50 / 49°F 90% 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
07:00

NNE
NNE

 5 / 7 mph 56 / 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
10:00

ENE
ENE

 6 / 6 mph 70 / 68°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
13:00

E
E

 5 / 6 mph 76 / 76°F 36% 1026 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
16:00

E
E

 6 / 8 mph 75 / 76°F 45% 1025 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
19:00

E
E

 4 / 5 mph 71 / 69°F 63% 1026 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
22:00

NNE
NNE

 4 / 4 mph 60 / 60°F 77% 1027 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 10
Sep		22:00

N
N

 4 / 8 mph 58 / 58°F 84% 1021 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 11
Sep		01:00

N
N

 4 / 9 mph 55 / 54°F 85% 1020 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 4 / 7 mph 53 / 52°F 86% 1020 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 3 / 5 mph 58 / 57°F 74% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 4 / 5 mph 73 / 76°F 46% 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
13:00

NNE
NNE

 5 / 6 mph 80 / 78°F 33% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 4 / 5 mph 80 / 79°F 42% 1018 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 3 / 6 mph 68 / 66°F 61% 1019 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

 4 / 7 mph 65 / 65°F 63% 1020 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 12
Sep		01:00

N
N

 7 / 9 mph 65 / 65°F 64% 1022 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NNE
NNE

 7 / 9 mph 62 / 62°F 67% 1022 mb
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

 6 / 7 mph 62 / 60°F 63% 1024 mb
Low level cloud: 1%
Mid level cloud: 38%
High level cloud: 0%
Most Significant Cloud Type: medium
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 4 / 5 mph 72 / 69°F 49% 1024 mb
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 3 / 4 mph 78 / 77°F 42% 1023 mb
Low level cloud: 11%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 4 / 4 mph 78 / 77°F 42% 1021 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 4 / 7 mph 66 / 64°F 82% 1022 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 3 / 5 mph 59 / 59°F 95% 1023 mb
Low level cloud: 28%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 13
Sep		01:00

SSW
SSW

 3 / 6 mph 57 / 57°F 97% 1023 mb
Low level cloud: 54%
Mid level cloud: 20%
High level cloud: 51%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 3 / 6 mph 56 / 56°F 98% 1022 mb
Low level cloud: 49%
Mid level cloud: 8%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 3 / 4 mph 62 / 60°F 90% 1022 mb
Low level cloud: 76%
Mid level cloud: 18%
High level cloud: 7%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SW
SW

 5 / 6 mph 73 / 76°F 64% 1021 mb
Low level cloud: 66%
Mid level cloud: 26%
High level cloud: 85%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 6 / 7 mph 80 / 79°F 51% 1018 mb
Low level cloud: 29%
Mid level cloud: 42%
High level cloud: 9%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 7 / 9 mph 75 / 77°F 66% 1017 mb
Low level cloud: 0%
Mid level cloud: 42%
High level cloud: 16%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 4 / 6 mph 67 / 65°F 96% 1018 mb
Low level cloud: 35%
Mid level cloud: 45%
High level cloud: 80%
Most Significant Cloud Type: low
60%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

SSW
SSW

 4 / 7 mph 63 / 63°F 98% 1018 mb
Low level cloud: 22%
Mid level cloud: 44%
High level cloud: 57%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 14
Sep		01:00

SSW
SSW

 3 / 4 mph 62 / 62°F 98% 1018 mb
Low level cloud: 48%
Mid level cloud: 57%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 1 / 2 mph 61 / 61°F 98% 1017 mb
Low level cloud: 12%
Mid level cloud: 56%
High level cloud: 0%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 1 / 2 mph 66 / 64°F 94% 1017 mb
Low level cloud: 6%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 3 / 3 mph 78 / 78°F 56% 1017 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 3%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 0 / 0 mph 85 / 82°F 40% 1016 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 3 / 4 mph 82 / 81°F 47% 1015 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

 3 / 6 mph 72 / 69°F 62% 1017 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNW
NNW

 3 / 6 mph 66 / 65°F 64% 1019 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 15
Sep		01:00

N
N

 4 / 7 mph 63 / 63°F 66% 1020 mb
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 4 / 7 mph 61 / 61°F 76% 1021 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

 4 / 5 mph 64 / 63°F 69% 1022 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 4 / 4 mph 79 / 78°F 46% 1022 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 3 / 3 mph 84 / 82°F 37% 1021 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
16:00

E
E

 3 / 3 mph 85 / 82°F 39% 1020 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 4 / 8 mph 71 / 68°F 65% 1022 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 3 / 4 mph 67 / 67°F 77% 1022 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
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 16
Sep		01:00

NNE
NNE

 3 / 4 mph 65 / 65°F 90% 1025 mb
Low level cloud: 6%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
62%
0.0 In
07:00

NNE
NNE

 7 / 8 mph 62 / 62°F 75% 1021 mb
Low level cloud: 49%
Mid level cloud: 47%
High level cloud: 33%
Most Significant Cloud Type: low
69%
0.0 In
13:00

NE
NE

 6 / 7 mph 84 / 82°F 31% 1014 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 6%
Most Significant Cloud Type: medium
11%
0.0 In
19:00

SSE
SSE

 4 / 5 mph 70 / 70°F 53% 1019 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 66%
Most Significant Cloud Type: medium
29%
0.0 In
Wed 17
Sep		01:00

N
N

 2 / 3 mph 66 / 65°F 68% 1022 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 6%
Most Significant Cloud Type: medium
46%
0.0 In
07:00

NW
NW

 1 / 1 mph 70 / 70°F 79% 1019 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
13:00

SSE
SSE

 5 / 6 mph 82 / 82°F 36% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 32%
Most Significant Cloud Type: high
31%
0.0 In
19:00

S
S

 4 / 8 mph 70 / 70°F 79% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
15%
0.0 In
Thu 18
Sep		01:00

NNE
NNE

 4 / 6 mph 65 / 65°F 84% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NNE
NNE

 2 / 4 mph 63 / 63°F 91% 1019 mb
Low level cloud: 41%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: low
42%
0.0 In
13:00

SSE
SSE

 0 / 1 mph 91 / 90°F 30% 1016 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

S
S

 3 / 6 mph 74 / 78°F 73% 1016 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
0.0 In
Fri 19
Sep		01:00

SSW
SSW

 4 / 6 mph 70 / 70°F 67% 1015 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

NNE
NNE

 4 / 6 mph 66 / 67°F 86% 1015 mb
Low level cloud: 38%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
41%
0.0 In
13:00

WNW
WNW

 8 / 13 mph 97 / 98°F 26% 1012 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: medium
9%
0.0 In
19:00

S
S

 5 / 9 mph 76 / 79°F 67% 1011 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
3%
0.0 In
Sat 20
Sep		01:00

N
N

 4 / 7 mph 78 / 81°F 72% 1014 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
21%
0.0 In
07:00

WNW
WNW

 2 / 4 mph 73 / 77°F 83% 1012 mb
Low level cloud: 4%
Mid level cloud: 18%
High level cloud: 12%
Most Significant Cloud Type: medium
30%
0.0 In
13:00

S
S

 5 / 8 mph 97 / 100°F 34% 1012 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
19:00

NNW
NNW

 5 / 8 mph 76 / 78°F 62% 1013 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 10%
Most Significant Cloud Type: medium
7%
0.0 In
Sun 21
Sep		01:00

E
E

 2 / 3 mph 67 / 67°F 97% 1014 mb
Low level cloud: 90%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.0 In
07:00

N
N

 4 / 7 mph 66 / 66°F 54% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 32%
Most Significant Cloud Type: medium
7%
0.0 In
13:00

S
S

 9 / 15 mph 85 / 85°F 38% 1010 mb
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
0.0 In
19:00

NW
NW

 3 / 5 mph 72 / 76°F 48% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Mon 22
Sep		01:00

SSW
SSW

 3 / 5 mph 69 / 69°F 99% 1010 mb
Low level cloud: 82%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

N
N

 3 / 5 mph 63 / 63°F 64% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
0.0 In
13:00

NW
NW

 6 / 9 mph 85 / 86°F 41% 1010 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 22%
Most Significant Cloud Type: medium
45%
0.0 In
19:00

S
S

 5 / 9 mph 70 / 70°F 72% 1021 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
Tue 23
Sep		01:00

NNE
NNE

 8 / 12 mph 66 / 66°F 61% 1017 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.0 In
07:00

S
S

 1 / 1 mph 68 / 68°F 78% 1023 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
13:00

E
E

 5 / 9 mph 74 / 76°F 38% 1020 mb
Low level cloud: 8%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: medium
52%
0.0 In
19:00

S
S

 6 / 11 mph 72 / 76°F 65% 1021 mb
Low level cloud: 0%
Mid level cloud: 40%
High level cloud: 3%
Most Significant Cloud Type: medium
39%
0.0 In
Wed 24
Sep		01:00

NE
NE

 2 / 4 mph 63 / 63°F 84% 1022 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

WSW
WSW

 1 / 2 mph 71 / 71°F 83% 1023 mb
Low level cloud: 5%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
0.0 In
13:00

ESE
ESE

 5 / 8 mph 79 / 78°F 31% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
19:00

SE
SE

 6 / 10 mph 77 / 80°F 71% 1023 mb
Low level cloud: 1%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: medium
34%
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