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Johnstown 14 Day Long Range Forecast

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

Pennsylvania, United States Of America

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

The forecast for Johnstown in the coming two weeks is predicting the average daytime maximum temperature will be around 23°C, with a high for the two weeks of 29°C expected on the afternoon of Wednesday 22nd. The average minimum temperature will be 12°C, dipping to its lowest on the morning of Saturday 25th at 3°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain. Predictions are Saturday 18th will have the most precipitation with an accumulation of around 15.0mm. On the whole winds are likely to be light.

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

SE
SE

 5 / 8 mph 55 / 55°F 99%
Low level cloud: 77%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 6 / 10 mph 56 / 55°F 97%
Low level cloud: 88%
Mid level cloud: 17%
High level cloud: 24%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 9 / 12 mph 62 / 60°F 81%
Low level cloud: 69%
Mid level cloud: 22%
High level cloud: 42%
Most Significant Cloud Type: low
82%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 7 / 11 mph 58 / 56°F 95%
Low level cloud: 65%
Mid level cloud: 91%
High level cloud: 15%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

S
S

 5 / 9 mph 58 / 57°F 97%
Low level cloud: 94%
Mid level cloud: 76%
High level cloud: 16%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SSE
SSE

 3 / 6 mph 58 / 58°F 98%
Low level cloud: 69%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 2 / 4 mph 58 / 59°F 99%
Low level cloud: 82%
Mid level cloud: 98%
High level cloud: 100%
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

 2 / 3 mph 57 / 58°F 100%
Low level cloud: 95%
Mid level cloud: 60%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
04:00

ENE
ENE

 2 / 3 mph 56 / 56°F 99%
Low level cloud: 84%
Mid level cloud: 52%
High level cloud: 63%
Most Significant Cloud Type: low
100%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
07:00

ESE
ESE

 1 / 2 mph 57 / 57°F 98%
Low level cloud: 80%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 3 / 4 mph 60 / 59°F 91%
Low level cloud: 80%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 4 / 6 mph 62 / 60°F 87%
Low level cloud: 62%
Mid level cloud: 43%
High level cloud: 7%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 7 / 9 mph 65 / 62°F 79%
Low level cloud: 54%
Mid level cloud: 21%
High level cloud: 2%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 5 / 7 mph 59 / 56°F 92%
Low level cloud: 55%
Mid level cloud: 20%
High level cloud: 2%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 4 / 6 mph 54 / 53°F 98%
Low level cloud: 68%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		01:00

SE
SE

 3 / 6 mph 52 / 52°F 99%
Low level cloud: 76%
Mid level cloud: 15%
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

SE
SE

 3 / 4 mph 51 / 52°F 96%
Low level cloud: 57%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 3 / 5 mph 56 / 54°F 87%
Low level cloud: 49%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 3 / 4 mph 69 / 65°F 65%
Low level cloud: 51%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

E
E

 4 / 4 mph 74 / 76°F 56%
Low level cloud: 4%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

 5 / 7 mph 75 / 76°F 56%
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

SE
SE

 4 / 7 mph 68 / 65°F 89%
Low level cloud: 3%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 2 / 4 mph 61 / 61°F 95%
Low level cloud: 27%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		01:00

SSE
SSE

 3 / 5 mph 60 / 60°F 90%
Low level cloud: 10%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 4 / 7 mph 59 / 59°F 95%
Low level cloud: 17%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 2 / 3 mph 63 / 60°F 81%
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSE
SSE

 4 / 5 mph 74 / 76°F 55%
Low level cloud: 2%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSE
SSE

 6 / 7 mph 79 / 77°F 47%
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 5 / 8 mph 78 / 77°F 54%
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 4 / 6 mph 72 / 69°F 82%
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 4 / 7 mph 64 / 64°F 92%
Low level cloud: 7%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		01:00

S
S

 4 / 8 mph 62 / 62°F 94%
Low level cloud: 16%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 4 / 8 mph 60 / 60°F 93%
Low level cloud: 10%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSE
SSE

 3 / 5 mph 65 / 63°F 78%
Low level cloud: 0%
Mid level cloud: 10%
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

SSW
SSW

 5 / 6 mph 77 / 77°F 52%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 6 / 7 mph 82 / 79°F 42%
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 6 / 9 mph 81 / 79°F 45%
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 8%
Most Significant Cloud Type: medium
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 4 / 6 mph 74 / 76°F 84%
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SE
SE

 4 / 6 mph 66 / 66°F 95%
Low level cloud: 17%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		01:00

SE
SE

 4 / 7 mph 64 / 64°F 94%
Low level cloud: 17%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSE
SSE

 4 / 8 mph 62 / 62°F 96%
Low level cloud: 32%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

S
S

 4 / 8 mph 69 / 66°F 81%
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
10:00

WSW
WSW

 10 / 13 mph 79 / 79°F 57%
Low level cloud: 4%
Mid level cloud: 37%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SW
SW

 11 / 14 mph 83 / 82°F 49%
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 32%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 9 / 14 mph 84 / 82°F 51%
Low level cloud: 0%
Mid level cloud: 26%
High level cloud: 32%
Most Significant Cloud Type: medium
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 3 / 6 mph 72 / 68°F 96%
Low level cloud: 43%
Mid level cloud: 44%
High level cloud: 11%
Most Significant Cloud Type: low
59%
Expect 0.3 In of precipitation over the past 3 hours.
0.3 In
22:00

SE
SE

 5 / 10 mph 67 / 67°F 97%
Low level cloud: 43%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 23
May		01:00

S
S

 4 / 8 mph 65 / 65°F 98%
Low level cloud: 69%
Mid level cloud: 18%
High level cloud: 10%
Most Significant Cloud Type: low
76%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

S
S

 5 / 9 mph 64 / 64°F 98%
Low level cloud: 65%
Mid level cloud: 5%
High level cloud: 37%
Most Significant Cloud Type: low
70%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

SW
SW

 9 / 15 mph 68 / 66°F 92%
Low level cloud: 23%
Mid level cloud: 17%
High level cloud: 38%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 15 / 21 mph 75 / 77°F 68%
Low level cloud: 31%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 17 / 25 mph 67 / 66°F 87%
Low level cloud: 63%
Mid level cloud: 11%
High level cloud: 85%
Most Significant Cloud Type: low
76%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
16:00

W
W

 17 / 24 mph 71 / 69°F 62%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 14 / 23 mph 63 / 62°F 77%
Low level cloud: 21%
Mid level cloud: 11%
High level cloud: 6%
Most Significant Cloud Type: low
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 11 / 18 mph 53 / 50°F 86%
Low level cloud: 45%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
45%
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

WNW
WNW

 2 / 5 mph 57 / 58°F 89%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
0.0 In
07:00

W
W

 9 / 18 mph 52 / 49°F 80%
Low level cloud: 34%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
50%
0.0 In
13:00

SSW
SSW

 7 / 15 mph 78 / 78°F 36%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
19:00

SE
SE

 7 / 16 mph 68 / 68°F 83%
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
Sat 25
May		01:00

NE
NE

 1 / 3 mph 61 / 60°F 97%
Low level cloud: 42%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

W
W

 6 / 13 mph 45 / 41°F 81%
Low level cloud: 66%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
66%
0.0 In
13:00

SSE
SSE

 6 / 14 mph 77 / 79°F 48%
Low level cloud: 0%
Mid level cloud: 28%
High level cloud: 3%
Most Significant Cloud Type: medium
28%
0.0 In
19:00

ESE
ESE

 3 / 6 mph 73 / 77°F 79%
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 32%
Most Significant Cloud Type: medium
12%
0.0 In
Sun 26
May		01:00

SE
SE

 8 / 16 mph 58 / 56°F 96%
Low level cloud: 68%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
69%
0.0 In
07:00

SW
SW

 8 / 16 mph 62 / 62°F 94%
Low level cloud: 27%
Mid level cloud: 30%
High level cloud: 100%
Most Significant Cloud Type: low
49%
0.3 In
13:00

WSW
WSW

 9 / 19 mph 72 / 76°F 85%
Low level cloud: 87%
Mid level cloud: 29%
High level cloud: 32%
Most Significant Cloud Type: low
100%
0.3 In
19:00

SW
SW

 4 / 9 mph 69 / 69°F 95%
Low level cloud: 28%
Mid level cloud: 17%
High level cloud: 2%
Most Significant Cloud Type: low
34%
0.2 In
Mon 27
May		01:00

WSW
WSW

 3 / 6 mph 67 / 67°F 95%
Low level cloud: 18%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: low
19%
0.1 In
07:00

WSW
WSW

 8 / 16 mph 60 / 60°F 99%
Low level cloud: 97%
Mid level cloud: 10%
High level cloud: 94%
Most Significant Cloud Type: low
100%
0.6 In
13:00

SW
SW

 5 / 10 mph 69 / 69°F 92%
Low level cloud: 23%
Mid level cloud: 50%
High level cloud: 100%
Most Significant Cloud Type: low
52%
0.1 In
19:00

SW
SW

 4 / 8 mph 67 / 67°F 95%
Low level cloud: 27%
Mid level cloud: 32%
High level cloud: 15%
Most Significant Cloud Type: low
39%
0.3 In
Tue 28
May		01:00

NW
NW

 1 / 2 mph 64 / 64°F 99%
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.4 In
07:00

WNW
WNW

 4 / 9 mph 58 / 58°F 99%
Low level cloud: 96%
Mid level cloud: 87%
High level cloud: 10%
Most Significant Cloud Type: low
100%
0.2 In
13:00

SE
SE

 4 / 9 mph 67 / 67°F 88%
Low level cloud: 90%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
19:00

NNW
NNW

 6 / 13 mph 61 / 62°F 87%
Low level cloud: 1%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: medium
31%
0.1 In
Wed 29
May		01:00

SE
SE

 3 / 6 mph 60 / 60°F 99%
Low level cloud: 96%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
07:00

N
N

 3 / 6 mph 55 / 56°F 91%
Low level cloud: 34%
Mid level cloud: 6%
High level cloud: 14%
Most Significant Cloud Type: low
37%
0.0 In
13:00

W
W

 11 / 23 mph 61 / 61°F 78%
Low level cloud: 46%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
49%
0.1 In
19:00

ESE
ESE

 6 / 12 mph 65 / 65°F 84%
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
Thu 30
May		01:00

W
W

 4 / 8 mph 59 / 59°F 83%
Low level cloud: 35%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: low
61%
0.0 In
07:00

SE
SE

 12 / 25 mph 57 / 54°F 89%
Low level cloud: 47%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
51%
0.0 In
13:00

W
W

 11 / 22 mph 67 / 67°F 60%
Low level cloud: 2%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
48%
0.0 In
19:00

SE
SE

 16 / 34 mph 56 / 53°F 98%
Low level cloud: 94%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
Fri 31
May		01:00

S
S

 2 / 5 mph 63 / 63°F 95%
Low level cloud: 15%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: low
17%
0.1 In
07:00

S
S

 8 / 16 mph 51 / 48°F 94%
Low level cloud: 76%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
91%
0.3 In
13:00

SSE
SSE

 7 / 15 mph 70 / 70°F 69%
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
19:00

WSW
WSW

 12 / 25 mph 55 / 52°F 96%
Low level cloud: 91%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
Sat 01
Jun		01:00

ESE
ESE

 11 / 23 mph 58 / 56°F 98%
Low level cloud: 95%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.7 In
07:00

W
W

 16 / 33 mph 45 / 38°F 97%
Low level cloud: 99%
Mid level cloud: 73%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.3 In
13:00

W
W

 10 / 21 mph 67 / 67°F 73%
Low level cloud: 56%
Mid level cloud: 29%
High level cloud: 0%
Most Significant Cloud Type: low
65%
0.2 In
19:00

WNW
WNW

 13 / 28 mph 56 / 53°F 69%
Low level cloud: 0%
Mid level cloud: 29%
High level cloud: 8%
Most Significant Cloud Type: medium
28%
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