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Salem 14 Day Long Range Forecast

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

Indiana, United States Of America

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

Over the next 14 days the Salem forecast suggests the average daytime maximum temperature will be around 27°C, with a high for the two weeks of 29°C expected on the afternoon of Tuesday 21st. The mean minimum temperature will be 17°C, dipping to its lowest on the morning of Friday 24th at 11°C. The next 14 days will have some days seeing a little precipitation and some days with rain. It looks like Saturday 25th will have the most precipitation with an accumulation of around 48.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Fri 17
May		04:00

WSW
WSW

 7 / 15 mph 60 / 60°F 97%
Low level cloud: 65%
Mid level cloud: 72%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

SW
SW

 7 / 12 mph 61 / 60°F 98%
Low level cloud: 71%
Mid level cloud: 80%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
10:00

SSW
SSW

 6 / 7 mph 65 / 64°F 96%
Low level cloud: 61%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
88%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

S
S

 9 / 10 mph 67 / 67°F 91%
Low level cloud: 75%
Mid level cloud: 44%
High level cloud: 97%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 9 / 11 mph 68 / 68°F 84%
Low level cloud: 83%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 6 / 8 mph 69 / 66°F 93%
Low level cloud: 41%
Mid level cloud: 19%
High level cloud: 13%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 5 / 7 mph 63 / 64°F 98%
Low level cloud: 41%
Mid level cloud: 17%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		01:00

SSW
SSW

 4 / 7 mph 58 / 58°F 97%
Low level cloud: 36%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

S
S

 2 / 4 mph 57 / 59°F 97%
Low level cloud: 36%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 1 / 1 mph 63 / 60°F 94%
Low level cloud: 39%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 3 / 4 mph 74 / 76°F 76%
Low level cloud: 55%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 4 / 5 mph 77 / 78°F 65%
Low level cloud: 88%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 2 / 2 mph 81 / 79°F 63%
Low level cloud: 55%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 3 / 5 mph 75 / 76°F 82%
Low level cloud: 13%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
18%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NE
NE

 2 / 3 mph 66 / 66°F 89%
Low level cloud: 1%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		01:00

SSE
SSE

 1 / 2 mph 64 / 64°F 90%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 2 / 3 mph 63 / 63°F 92%
Low level cloud: 0%
Mid level cloud: 5%
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

NNW
NNW

 3 / 5 mph 67 / 65°F 90%
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 4 / 4 mph 78 / 78°F 72%
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 4 / 4 mph 83 / 82°F 58%
Low level cloud: 17%
Mid level cloud: 15%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

 4 / 5 mph 84 / 83°F 54%
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
19:00

N
N

 1 / 2 mph 80 / 80°F 72%
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

ENE
ENE

 1 / 2 mph 69 / 69°F 79%
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
Mon 20
May		01:00

ESE
ESE

 4 / 7 mph 66 / 66°F 81%
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
04:00

S
S

 3 / 6 mph 64 / 64°F 84%
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 4 / 9 mph 68 / 65°F 88%
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

S
S

 6 / 7 mph 79 / 79°F 68%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: high
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 6 / 7 mph 84 / 83°F 58%
Low level cloud: 12%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 6 / 7 mph 84 / 84°F 59%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 10%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 6 / 11 mph 78 / 78°F 81%
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 32%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 5 / 11 mph 68 / 68°F 90%
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 19%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		01:00

SSW
SSW

 4 / 9 mph 67 / 67°F 92%
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
04:00

S
S

 5 / 11 mph 65 / 65°F 94%
Low level cloud: 0%
Mid level cloud: 5%
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

S
S

 6 / 11 mph 69 / 67°F 89%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 10 / 12 mph 79 / 81°F 71%
Low level cloud: 2%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 13 / 15 mph 84 / 86°F 61%
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 12 / 15 mph 85 / 88°F 65%
Low level cloud: 9%
Mid level cloud: 16%
High level cloud: 1%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

S
S

 9 / 18 mph 78 / 80°F 80%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 9 / 18 mph 71 / 71°F 92%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 6%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		01:00

SSW
SSW

 9 / 17 mph 71 / 71°F 88%
Low level cloud: 26%
Mid level cloud: 7%
High level cloud: 33%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 12 / 21 mph 71 / 71°F 88%
Low level cloud: 4%
Mid level cloud: 15%
High level cloud: 93%
Most Significant Cloud Type: medium
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 13 / 20 mph 73 / 76°F 84%
Low level cloud: 1%
Mid level cloud: 40%
High level cloud: 99%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 14 / 18 mph 78 / 80°F 76%
Low level cloud: 2%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 17 / 19 mph 85 / 88°F 63%
Low level cloud: 17%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

 17 / 21 mph 85 / 88°F 67%
Low level cloud: 27%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSW
SSW

 17 / 29 mph 78 / 80°F 75%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 17 / 32 mph 71 / 71°F 85%
Low level cloud: 90%
Mid level cloud: 62%
High level cloud: 78%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 23
May		01:00

WSW
WSW

 18 / 28 mph 69 / 69°F 87%
Low level cloud: 36%
Mid level cloud: 20%
High level cloud: 19%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

 17 / 25 mph 68 / 68°F 88%
Low level cloud: 85%
Mid level cloud: 16%
High level cloud: 4%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 13 / 17 mph 61 / 61°F 85%
Low level cloud: 89%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 12 / 14 mph 65 / 65°F 77%
Low level cloud: 88%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

 13 / 14 mph 73 / 76°F 59%
Low level cloud: 22%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WNW
WNW

 13 / 15 mph 73 / 76°F 59%
Low level cloud: 36%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 7 / 11 mph 69 / 67°F 76%
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

WNW
WNW

 4 / 8 mph 61 / 61°F 86%
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		HumidityCloud AmountPrecip AmountWeather
Fri 24
May		01:00

E
E

 4 / 9 mph 60 / 60°F 92%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

E
E

 4 / 8 mph 64 / 64°F 87%
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 38%
Most Significant Cloud Type: medium
15%
0.0 In
13:00

SSW
SSW

 11 / 24 mph 73 / 77°F 82%
Low level cloud: 27%
Mid level cloud: 31%
High level cloud: 88%
Most Significant Cloud Type: low
48%
0.0 In
19:00

S
S

 9 / 18 mph 80 / 86°F 83%
Low level cloud: 6%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
8%
0.0 In
Sat 25
May		01:00

SE
SE

 7 / 15 mph 68 / 68°F 86%
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: medium
44%
0.0 In
07:00

SSE
SSE

 8 / 16 mph 61 / 61°F 86%
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 44%
Most Significant Cloud Type: medium
18%
0.0 In
13:00

SSW
SSW

 14 / 28 mph 82 / 86°F 66%
Low level cloud: 4%
Mid level cloud: 6%
High level cloud: 33%
Most Significant Cloud Type: low
9%
0.0 In
19:00

SSE
SSE

 6 / 13 mph 67 / 67°F 98%
Low level cloud: 24%
Mid level cloud: 46%
High level cloud: 72%
Most Significant Cloud Type: low
48%
1.4 In
Sun 26
May		01:00

W
W

 10 / 20 mph 71 / 71°F 92%
Low level cloud: 45%
Mid level cloud: 22%
High level cloud: 21%
Most Significant Cloud Type: low
55%
0.1 In
07:00

SSW
SSW

 5 / 11 mph 68 / 68°F 99%
Low level cloud: 97%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.9 In
13:00

WNW
WNW

 5 / 10 mph 78 / 79°F 52%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 2%
Most Significant Cloud Type: medium
12%
0.1 In
19:00

WNW
WNW

 13 / 28 mph 70 / 70°F 97%
Low level cloud: 50%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
77%
1.0 In
Mon 27
May		01:00

SE
SE

 4 / 9 mph 66 / 66°F 95%
Low level cloud: 7%
Mid level cloud: 12%
High level cloud: 79%
Most Significant Cloud Type: medium
36%
0.0 In
07:00

S
S

 6 / 13 mph 63 / 63°F 98%
Low level cloud: 58%
Mid level cloud: 41%
High level cloud: 100%
Most Significant Cloud Type: low
84%
3.6 In
13:00

WSW
WSW

 13 / 28 mph 75 / 78°F 84%
Low level cloud: 84%
Mid level cloud: 46%
High level cloud: 95%
Most Significant Cloud Type: low
100%
1.3 In
19:00

NNW
NNW

 12 / 26 mph 63 / 63°F 89%
Low level cloud: 92%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
95%
0.5 In
Tue 28
May		01:00

SSE
SSE

 5 / 11 mph 68 / 68°F 99%
Low level cloud: 58%
Mid level cloud: 45%
High level cloud: 3%
Most Significant Cloud Type: low
73%
0.1 In
07:00

NNE
NNE

 5 / 10 mph 57 / 57°F 93%
Low level cloud: 39%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
13:00

WNW
WNW

 13 / 27 mph 75 / 78°F 76%
Low level cloud: 34%
Mid level cloud: 8%
High level cloud: 70%
Most Significant Cloud Type: low
45%
0.4 In
19:00

NE
NE

 4 / 8 mph 67 / 67°F 80%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 77%
Most Significant Cloud Type: high
77%
0.0 In
Wed 29
May		01:00

N
N

 4 / 9 mph 61 / 61°F 84%
Low level cloud: 22%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
07:00

ENE
ENE

 4 / 8 mph 60 / 60°F 87%
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 100%
Most Significant Cloud Type: medium
26%
0.0 In
13:00

WNW
WNW

 8 / 16 mph 72 / 76°F 57%
Low level cloud: 23%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
19:00

ESE
ESE

 7 / 15 mph 70 / 70°F 85%
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 33%
Most Significant Cloud Type: medium
47%
0.0 In
Thu 30
May		01:00

SW
SW

 4 / 8 mph 61 / 61°F 86%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
07:00

WSW
WSW

 14 / 30 mph 60 / 60°F 97%
Low level cloud: 95%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.4 In
13:00

SW
SW

 6 / 12 mph 78 / 80°F 61%
Low level cloud: 49%
Mid level cloud: 8%
High level cloud: 18%
Most Significant Cloud Type: low
53%
0.0 In
19:00

WSW
WSW

 20 / 42 mph 65 / 65°F 88%
Low level cloud: 80%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.1 In
Fri 31
May		01:00

ESE
ESE

 4 / 7 mph 67 / 67°F 91%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
0.1 In
07:00

W
W

 15 / 31 mph 54 / 50°F 92%
Low level cloud: 96%
Mid level cloud: 67%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

ENE
ENE

 7 / 16 mph 63 / 63°F 96%
Low level cloud: 92%
Mid level cloud: 88%
High level cloud: 41%
Most Significant Cloud Type: low
100%
0.6 In
19:00

WNW
WNW

 12 / 25 mph 61 / 61°F 78%
Low level cloud: 5%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.0 In
Sat 01
Jun		01:00

NE
NE

 1 / 2 mph 60 / 60°F 98%
Low level cloud: 62%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.0 In
07:00

WSW
WSW

 4 / 9 mph 57 / 56°F 89%
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
28%
0.0 In
13:00

SW
SW

 8 / 17 mph 79 / 81°F 64%
Low level cloud: 77%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
79%
0.0 In
19:00

S
S

 4 / 8 mph 69 / 69°F 83%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: medium
45%
0.0 In

The day label given represents the local day relative to the local time for the location you are looking at.
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Day

This time is corrected for local time zones and where possible for daylight saving times.
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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.
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Dir

This refers to the sustained average wind speed, normally averaged over a period of 10 minutes for up to 3 hrs.
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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.
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Temp/
Feels Like

The relative humidity is the percent of saturation humidity, generally calculated in relation to saturated vapour density.
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Humidity

The value given is a total predicted for the previous 3 hrs and includes the time of the forecast being looked at.
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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.
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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.
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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.
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Pressure