WEATHER FOR BUSINESS

We supply weather data to businesses

Free Weather Plugin

Add this forecast to your website



Local Weather

Terni 14 Day Long Range Forecast

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

Italy

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

Reviewing the forecast for Terni Over the next 14 days and the average daytime maximum temperature will be around 24°C, with a high for the two weeks of 30°C expected on the afternoon of Tuesday 30th. The average minimum temperature will be 9°C, dipping to its lowest on the morning of Thursday 25th at 4°C. The coming 14 days will have some days seeing a little precipitation and some days with rain. Current predictions suggest Wednesday 1st will have the most precipitation with an accumulation of around 12.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 25
Apr
22:00

SE
SE

4 / 8 mph 41 / 39°F 95% 1011 mb
Low level cloud: 28%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 26
Apr
01:00

SE
SE

2 / 5 mph 40 / 39°F 93% 1012 mb
Low level cloud: 30%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

4 / 7 mph 40 / 37°F 93% 1012 mb
Low level cloud: 59%
Mid level cloud: 13%
High level cloud: 90%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

4 / 4 mph 48 / 47°F 83% 1013 mb
Low level cloud: 33%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

6 / 7 mph 59 / 56°F 67% 1013 mb
Low level cloud: 54%
Mid level cloud: 28%
High level cloud: 2%
Most Significant Cloud Type: low
64%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

7 / 9 mph 64 / 62°F 62% 1012 mb
Low level cloud: 30%
Mid level cloud: 44%
High level cloud: 7%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

6 / 8 mph 64 / 62°F 70% 1012 mb
Low level cloud: 27%
Mid level cloud: 30%
High level cloud: 33%
Most Significant Cloud Type: low
41%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SE
SE

3 / 7 mph 47 / 45°F 90% 1013 mb
Low level cloud: 58%
Mid level cloud: 28%
High level cloud: 11%
Most Significant Cloud Type: low
68%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

SE
SE

3 / 6 mph 45 / 44°F 92% 1015 mb
Low level cloud: 1%
Mid level cloud: 13%
High level cloud: 10%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 27
Apr
01:00

E
E

3 / 7 mph 43 / 41°F 93% 1015 mb
Low level cloud: 18%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

E
E

3 / 7 mph 42 / 40°F 89% 1015 mb
Low level cloud: 20%
Mid level cloud: 52%
High level cloud: 14%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

3 / 6 mph 49 / 48°F 83% 1016 mb
Low level cloud: 6%
Mid level cloud: 66%
High level cloud: 62%
Most Significant Cloud Type: medium
86%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

3 / 3 mph 67 / 64°F 59% 1016 mb
Low level cloud: 0%
Mid level cloud: 69%
High level cloud: 17%
Most Significant Cloud Type: medium
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

6 / 7 mph 73 / 76°F 48% 1016 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 24%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

7 / 8 mph 73 / 76°F 48% 1015 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 18%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

2 / 5 mph 55 / 54°F 77% 1017 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 32%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

2 / 5 mph 51 / 51°F 84% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 49%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 28
Apr
01:00

ENE
ENE

3 / 7 mph 47 / 46°F 83% 1019 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

4 / 8 mph 46 / 44°F 82% 1018 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
07:00

ENE
ENE

2 / 3 mph 58 / 58°F 68% 1018 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
10:00

NNW
NNW

3 / 3 mph 76 / 76°F 43% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

4 / 4 mph 80 / 78°F 34% 1018 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
16:00

WNW
WNW

3 / 4 mph 80 / 78°F 38% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 1%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

2 / 5 mph 62 / 60°F 68% 1017 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 15%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

3 / 7 mph 56 / 57°F 80% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 29
Apr
01:00

ENE
ENE

3 / 7 mph 52 / 52°F 86% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 7%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

3 / 7 mph 51 / 50°F 87% 1019 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

NE
NE

3 / 5 mph 63 / 60°F 71% 1019 mb
Low level cloud: 0%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: medium
73%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

3 / 3 mph 81 / 79°F 44% 1017 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
13:00

WNW
WNW

4 / 5 mph 85 / 82°F 38% 1017 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

3 / 4 mph 85 / 82°F 45% 1016 mb
Low level cloud: 0%
Mid level cloud: 26%
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

SSW
SSW

3 / 6 mph 63 / 61°F 83% 1017 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
22:00

ENE
ENE

3 / 6 mph 56 / 57°F 92% 1019 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
Tue 30
Apr
01:00

ENE
ENE

3 / 5 mph 53 / 54°F 92% 1019 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ENE
ENE

3 / 7 mph 52 / 52°F 91% 1018 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
07:00

NE
NE

2 / 3 mph 64 / 62°F 79% 1017 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

2 / 2 mph 82 / 80°F 50% 1016 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

4 / 5 mph 86 / 82°F 41% 1014 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

5 / 6 mph 84 / 82°F 45% 1013 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 32%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

2 / 4 mph 65 / 62°F 69% 1012 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 32%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

2 / 5 mph 56 / 57°F 82% 1013 mb
Low level cloud: 0%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: medium
54%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 01
May
01:00

ESE
ESE

3 / 7 mph 55 / 55°F 87% 1012 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

3 / 6 mph 55 / 55°F 95% 1010 mb
Low level cloud: 14%
Mid level cloud: 24%
High level cloud: 40%
Most Significant Cloud Type: low
27%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

ESE
ESE

4 / 8 mph 56 / 54°F 92% 1010 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 60%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

7 / 9 mph 67 / 65°F 80% 1011 mb
Low level cloud: 20%
Mid level cloud: 44%
High level cloud: 17%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

11 / 16 mph 66 / 65°F 77% 1012 mb
Low level cloud: 61%
Mid level cloud: 66%
High level cloud: 33%
Most Significant Cloud Type: low
87%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

S
S

8 / 11 mph 60 / 60°F 90% 1012 mb
Low level cloud: 69%
Mid level cloud: 88%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

SSE
SSE

5 / 7 mph 56 / 55°F 95% 1012 mb
Low level cloud: 66%
Mid level cloud: 75%
High level cloud: 32%
Most Significant Cloud Type: low
95%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

SSE
SSE

8 / 11 mph 55 / 53°F 94% 1014 mb
Low level cloud: 98%
Mid level cloud: 91%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 02
May
01:00

E
E

3 / 7 mph 59 / 60°F 94% 1010 mb
Low level cloud: 18%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: low
35%
0.0 In
07:00

S
S

2 / 3 mph 64 / 64°F 88% 1007 mb
Low level cloud: 9%
Mid level cloud: 41%
High level cloud: 21%
Most Significant Cloud Type: medium
68%
0.0 In
13:00

SSW
SSW

9 / 20 mph 70 / 70°F 62% 1012 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.0 In
19:00

SSE
SSE

6 / 13 mph 56 / 54°F 89% 1010 mb
Low level cloud: 19%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.0 In
Fri 03
May
01:00

SE
SE

5 / 11 mph 46 / 43°F 95% 1010 mb
Low level cloud: 7%
Mid level cloud: 41%
High level cloud: 5%
Most Significant Cloud Type: medium
62%
0.0 In
07:00

S
S

4 / 9 mph 56 / 55°F 94% 1012 mb
Low level cloud: 27%
Mid level cloud: 46%
High level cloud: 35%
Most Significant Cloud Type: low
47%
0.0 In
13:00

SSW
SSW

8 / 17 mph 72 / 76°F 51% 1009 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 100%
Most Significant Cloud Type: medium
57%
0.0 In
19:00

E
E

1 / 2 mph 66 / 66°F 72% 1012 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 4%
Most Significant Cloud Type: medium
3%
0.0 In
Sat 04
May
01:00

ENE
ENE

4 / 8 mph 56 / 56°F 80% 1014 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 6%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

ESE
ESE

2 / 3 mph 66 / 66°F 74% 1013 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 36%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

W
W

5 / 10 mph 81 / 82°F 43% 1010 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 91%
Most Significant Cloud Type: medium
49%
0.0 In
19:00

S
S

3 / 7 mph 62 / 62°F 80% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 74%
Most Significant Cloud Type: high
74%
0.0 In
Sun 05
May
01:00

SSW
SSW

4 / 8 mph 58 / 59°F 97% 1010 mb
Low level cloud: 73%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
82%
0.3 In
07:00

S
S

1 / 3 mph 67 / 67°F 72% 1008 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 90%
Most Significant Cloud Type: medium
34%
0.0 In
13:00

SW
SW

6 / 12 mph 73 / 76°F 47% 1010 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 39%
Most Significant Cloud Type: medium
31%
0.0 In
19:00

S
S

7 / 16 mph 58 / 57°F 95% 1008 mb
Low level cloud: 28%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.2 In
Mon 06
May
01:00

NE
NE

2 / 5 mph 55 / 56°F 96% 1011 mb
Low level cloud: 21%
Mid level cloud: 49%
High level cloud: 20%
Most Significant Cloud Type: low
39%
0.5 In
07:00

SSE
SSE

4 / 8 mph 58 / 58°F 95% 1010 mb
Low level cloud: 79%
Mid level cloud: 56%
High level cloud: 0%
Most Significant Cloud Type: low
98%
0.1 In
13:00

N
N

7 / 14 mph 73 / 77°F 58% 1009 mb
Low level cloud: 15%
Mid level cloud: 43%
High level cloud: 4%
Most Significant Cloud Type: low
30%
0.0 In
19:00

SSE
SSE

5 / 10 mph 54 / 53°F 94% 1012 mb
Low level cloud: 30%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.3 In
Tue 07
May
01:00

ENE
ENE

3 / 7 mph 55 / 55°F 87% 1012 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

SSE
SSE

2 / 4 mph 61 / 61°F 91% 1013 mb
Low level cloud: 29%
Mid level cloud: 25%
High level cloud: 19%
Most Significant Cloud Type: low
39%
0.0 In
13:00

NW
NW

5 / 10 mph 81 / 82°F 48% 1010 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
0.0 In
19:00

SSW
SSW

4 / 9 mph 53 / 52°F 91% 1012 mb
Low level cloud: 39%
Mid level cloud: 46%
High level cloud: 7%
Most Significant Cloud Type: low
56%
0.3 In
Wed 08
May
01:00

ESE
ESE

2 / 4 mph 58 / 60°F 94% 1012 mb
Low level cloud: 13%
Mid level cloud: 16%
High level cloud: 8%
Most Significant Cloud Type: low
19%
0.2 In
07:00

SSE
SSE

3 / 6 mph 53 / 53°F 93% 1011 mb
Low level cloud: 92%
Mid level cloud: 48%
High level cloud: 22%
Most Significant Cloud Type: low
100%
0.0 In
13:00

SSW
SSW

5 / 10 mph 75 / 78°F 63% 1012 mb
Low level cloud: 23%
Mid level cloud: 44%
High level cloud: 85%
Most Significant Cloud Type: low
48%
0.2 In
19:00

S
S

4 / 8 mph 57 / 57°F 82% 1010 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.1 In
Thu 09
May
01:00

ESE
ESE

2 / 4 mph 57 / 58°F 95% 1015 mb
Low level cloud: 12%
Mid level cloud: 28%
High level cloud: 3%
Most Significant Cloud Type: low
22%
0.2 In
07:00

ENE
ENE

2 / 3 mph 63 / 63°F 80% 1010 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
13%
0.0 In
13:00

SSW
SSW

5 / 11 mph 79 / 80°F 50% 1015 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
0.0 In
19:00

S
S

5 / 11 mph 51 / 49°F 92% 1010 mb
Low level cloud: 37%
Mid level cloud: 47%
High level cloud: 34%
Most Significant Cloud Type: low
57%
0.2 In
Fri 10
May
01:00

ESE
ESE

4 / 8 mph 58 / 58°F 93% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 11%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

NNW
NNW

0 / 1 mph 54 / 55°F 90% 1009 mb
Low level cloud: 24%
Mid level cloud: 51%
High level cloud: 31%
Most Significant Cloud Type: low
45%
0.2 In
13:00

SSW
SSW

5 / 11 mph 79 / 80°F 52% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 97%
Most Significant Cloud Type: medium
50%
0.0 In
19:00

NNW
NNW

2 / 5 mph 54 / 54°F 90% 1009 mb
Low level cloud: 30%
Mid level cloud: 66%
High level cloud: 33%
Most Significant Cloud Type: low
57%
0.2 In

Other Locations Near to Terni

Cities and Towns: Spoleto, Italy
Ski Resorts: Rucas di Bagnolo, Italy
Football: ASD Narnese Calcio, Italy
Motor Racing: Vallelunga Circuit, Italy

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