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Silver Spring 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Silver Spring

Maryland, United States Of America

Long range weather outlook for Silver Spring includes 14 day forecast summary:

The outlook for Silver Spring in the two weeks ahead shows the average daytime maximum temperature will be around 27°C, with a high for the two weeks of 34°C expected on the afternoon of Friday 5th. The mean minimum temperature will be 16°C, dipping to its lowest on the morning of Friday 12th at 11°C. Expect the next 14 days have mixed overhead conditions with some days dry and some seeing a significant amount of rain. It looks like Saturday 6th will have the most precipitation with an accumulation of around 28.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 04
Sep		01:00

S
S

 8 / 11 mph 68 / 68°F 59% 1012 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 7 / 12 mph 64 / 64°F 67% 1011 mb
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 9 / 12 mph 67 / 65°F 66% 1012 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SSW
SSW

 11 / 13 mph 79 / 79°F 47% 1011 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 3%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

SSW
SSW

 12 / 14 mph 88 / 85°F 32% 1008 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
16:00

W
W

 11 / 17 mph 71 / 71°F 82% 1009 mb
Low level cloud: 1%
Mid level cloud: 84%
High level cloud: 38%
Most Significant Cloud Type: medium
89%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

S
S

 5 / 8 mph 74 / 76°F 89% 1009 mb
Low level cloud: 0%
Mid level cloud: 51%
High level cloud: 19%
Most Significant Cloud Type: medium
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 6 / 9 mph 68 / 68°F 91% 1011 mb
Low level cloud: 7%
Mid level cloud: 24%
High level cloud: 17%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 05
Sep		19:00

S
S

 8 / 12 mph 89 / 87°F 37% 1012 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 6 / 8 mph 80 / 82°F 57% 1013 mb
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: medium
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 06
Sep		01:00

SSW
SSW

 9 / 14 mph 77 / 80°F 64% 1013 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
04:00

SSW
SSW

 9 / 12 mph 76 / 79°F 62% 1013 mb
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
07:00

WNW
WNW

 5 / 6 mph 77 / 78°F 65% 1015 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 12%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

N
N

 4 / 4 mph 82 / 81°F 55% 1015 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 60%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 5 / 6 mph 89 / 88°F 43% 1015 mb
Low level cloud: 43%
Mid level cloud: 30%
High level cloud: 37%
Most Significant Cloud Type: low
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NW
NW

 12 / 15 mph 76 / 78°F 72% 1014 mb
Low level cloud: 80%
Mid level cloud: 81%
High level cloud: 77%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
19:00

N
N

 5 / 7 mph 68 / 68°F 94% 1016 mb
Low level cloud: 21%
Mid level cloud: 65%
High level cloud: 72%
Most Significant Cloud Type: medium
100%
Expect 0.9 In of precipitation over the past 3 hours.
0.9 In
22:00

NNE
NNE

 4 / 6 mph 67 / 67°F 95% 1017 mb
Low level cloud: 48%
Mid level cloud: 44%
High level cloud: 95%
Most Significant Cloud Type: low
74%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Sun 07
Sep		01:00

NW
NW

 3 / 4 mph 66 / 66°F 93% 1017 mb
Low level cloud: 29%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 7 / 10 mph 64 / 64°F 83% 1017 mb
Low level cloud: 0%
Mid level cloud: 85%
High level cloud: 94%
Most Significant Cloud Type: medium
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NW
NW

 5 / 9 mph 65 / 63°F 68% 1019 mb
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 66%
Most Significant Cloud Type: medium
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 5 / 7 mph 71 / 68°F 48% 1020 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 5 / 6 mph 80 / 76°F 26% 1019 mb
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
16:00

NW
NW

 2 / 3 mph 81 / 77°F 25% 1018 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
19:00

E
E

 3 / 4 mph 75 / 76°F 45% 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
22:00

NNE
NNE

 4 / 6 mph 70 / 70°F 46% 1022 mb
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
Mon 08
Sep		01:00

N
N

 5 / 7 mph 66 / 65°F 51% 1023 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

 4 / 6 mph 63 / 63°F 57% 1024 mb
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
07:00

N
N

 4 / 7 mph 62 / 61°F 57% 1026 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
10:00

NNE
NNE

 5 / 6 mph 74 / 75°F 35% 1026 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
13:00

NNE
NNE

 3 / 4 mph 80 / 76°F 27% 1025 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

N
N

 4 / 4 mph 80 / 76°F 27% 1024 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
19:00

E
E

 4 / 5 mph 77 / 77°F 43% 1025 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
22:00

ENE
ENE

 4 / 7 mph 68 / 68°F 49% 1026 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
Tue 09
Sep		01:00

ENE
ENE

 4 / 6 mph 65 / 65°F 63% 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

NE
NE

 4 / 6 mph 62 / 62°F 69% 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

NE
NE

 6 / 9 mph 62 / 61°F 72% 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

 9 / 11 mph 73 / 76°F 43% 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

 9 / 10 mph 79 / 77°F 37% 1026 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
16:00

ESE
ESE

 11 / 12 mph 78 / 78°F 45% 1025 mb
Low level cloud: 30%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 9 / 12 mph 72 / 69°F 66% 1025 mb
Low level cloud: 58%
Mid level cloud: 31%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

E
E

 8 / 10 mph 68 / 68°F 72% 1025 mb
Low level cloud: 60%
Mid level cloud: 32%
High level cloud: 35%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 10
Sep		01:00

ENE
ENE

 6 / 8 mph 66 / 66°F 85% 1024 mb
Low level cloud: 96%
Mid level cloud: 60%
High level cloud: 73%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NE
NE

 7 / 10 mph 66 / 65°F 85% 1023 mb
Low level cloud: 97%
Mid level cloud: 96%
High level cloud: 22%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NE
NE

 7 / 11 mph 65 / 65°F 84% 1023 mb
Low level cloud: 96%
Mid level cloud: 48%
High level cloud: 34%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NE
NE

 6 / 9 mph 67 / 67°F 88% 1023 mb
Low level cloud: 100%
Mid level cloud: 77%
High level cloud: 96%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 7 / 8 mph 68 / 68°F 92% 1022 mb
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNE
NNE

 6 / 7 mph 69 / 68°F 90% 1021 mb
Low level cloud: 97%
Mid level cloud: 32%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNE
NNE

 4 / 4 mph 69 / 68°F 92% 1020 mb
Low level cloud: 97%
Mid level cloud: 25%
High level cloud: 21%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 4 / 4 mph 67 / 67°F 92% 1020 mb
Low level cloud: 99%
Mid level cloud: 27%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Thu 11
Sep		01:00

NNE
NNE

 3 / 6 mph 78 / 83°F 88% 1018 mb
Low level cloud: 10%
Mid level cloud: 18%
High level cloud: 22%
Most Significant Cloud Type: low
19%
0.0 In
07:00

NNW
NNW

 6 / 9 mph 68 / 68°F 83% 1019 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 79%
Most Significant Cloud Type: medium
11%
0.0 In
13:00

ENE
ENE

 10 / 13 mph 75 / 76°F 38% 1020 mb
Low level cloud: 86%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
19:00

ESE
ESE

 2 / 3 mph 84 / 86°F 47% 1018 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
Fri 12
Sep		01:00

N
N

 10 / 20 mph 61 / 61°F 92% 1017 mb
Low level cloud: 88%
Mid level cloud: 87%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
07:00

N
N

 6 / 13 mph 56 / 55°F 97% 1020 mb
Low level cloud: 99%
Mid level cloud: 44%
High level cloud: 38%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NNW
NNW

 8 / 13 mph 73 / 74°F 28% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

NNE
NNE

 5 / 8 mph 75 / 76°F 36% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sat 13
Sep		01:00

N
N

 6 / 11 mph 63 / 63°F 45% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

N
N

 2 / 4 mph 66 / 66°F 70% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

NNE
NNE

 6 / 9 mph 78 / 76°F 23% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

ESE
ESE

 4 / 7 mph 76 / 78°F 47% 1026 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Sun 14
Sep		01:00

N
N

 2 / 4 mph 69 / 69°F 43% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NE
NE

 3 / 5 mph 66 / 66°F 75% 1027 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
0.0 In
13:00

ESE
ESE

 2 / 4 mph 78 / 77°F 30% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 44%
Most Significant Cloud Type: high
44%
0.0 In
19:00

ESE
ESE

 4 / 7 mph 71 / 71°F 51% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 91%
Most Significant Cloud Type: high
91%
0.0 In
Mon 15
Sep		01:00

SW
SW

 3 / 5 mph 69 / 69°F 61% 1025 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

E
E

 2 / 3 mph 64 / 64°F 79% 1025 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
13:00

SW
SW

 2 / 3 mph 87 / 84°F 27% 1024 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

SSW
SSW

 3 / 5 mph 75 / 78°F 66% 1022 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 99%
Most Significant Cloud Type: medium
48%
0.0 In
Tue 16
Sep		01:00

SW
SW

 4 / 6 mph 71 / 71°F 60% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

SSE
SSE

 2 / 4 mph 69 / 69°F 99% 1022 mb
Low level cloud: 99%
Mid level cloud: 96%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
13:00

SSW
SSW

 5 / 8 mph 87 / 85°F 27% 1019 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

SSE
SSE

 5 / 8 mph 74 / 78°F 98% 1021 mb
Low level cloud: 84%
Mid level cloud: 95%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.1 In
Wed 17
Sep		01:00

SSW
SSW

 6 / 11 mph 70 / 70°F 66% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

SE
SE

 4 / 8 mph 66 / 65°F 99% 1019 mb
Low level cloud: 100%
Mid level cloud: 92%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.2 In
13:00

S
S

 9 / 15 mph 85 / 84°F 34% 1013 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
0.0 In
19:00

ESE
ESE

 7 / 13 mph 69 / 69°F 97% 1020 mb
Low level cloud: 99%
Mid level cloud: 74%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.8 In
Thu 18
Sep		01:00

S
S

 8 / 12 mph 72 / 76°F 76% 1012 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

E
E

 6 / 12 mph 66 / 66°F 98% 1019 mb
Low level cloud: 97%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
13:00

NW
NW

 7 / 11 mph 82 / 82°F 40% 1012 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
26%
0.0 In
19:00

ENE
ENE

 8 / 15 mph 67 / 67°F 98% 1018 mb
Low level cloud: 100%
Mid level cloud: 65%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.4 In
Fri 19
Sep		01:00

NNE
NNE

 7 / 12 mph 61 / 61°F 95% 1015 mb
Low level cloud: 68%
Mid level cloud: 95%
High level cloud: 99%
Most Significant Cloud Type: low
100%
0.2 In
07:00

NE
NE

 7 / 15 mph 66 / 66°F 99% 1016 mb
Low level cloud: 100%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.6 In
13:00

NNE
NNE

 7 / 11 mph 64 / 64°F 52% 1017 mb
Low level cloud: 3%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: medium
52%
0.2 In
19:00

NE
NE

 7 / 15 mph 69 / 69°F 99% 1011 mb
Low level cloud: 100%
Mid level cloud: 72%
High level cloud: 79%
Most Significant Cloud Type: low
100%
0.4 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