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Grytviken 14 Day Long Range Forecast

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

South Georgia And South Sandwich Islands

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

Over the next 14 days the Grytviken forecast suggests the average daytime maximum temperature will be around 2°C, with a high for the two weeks of 5°C expected on the afternoon of Wednesday 7th. The average minimum temperature will be 0°C, dipping to its lowest on the afternoon of Thursday 1st at -3°C. Expect the next 14 days have some days seeing a little precipitation and some days with rain, sleet or snow. The current forecast indicates Wednesday 7th will have the most precipitation with an accumulation of around 21.0mm. On the whole winds are likely to be light. The forecast suggests the strongest wind will be on the evening of Wednesday 7th, coming from a westerly direction, and reaching around 26mph. However, the maximum wind gusts are expected on Thursday morning.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 30
Dec		01:00

S
S

 4 / 7 mph 32 / 28°F 75% 987 mb
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SW
SW

 4 / 6 mph 33 / 28°F 74% 989 mb
Low level cloud: 30%
Mid level cloud: 22%
High level cloud: 72%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 5 / 8 mph 33 / 27°F 71% 991 mb
Low level cloud: 21%
Mid level cloud: 46%
High level cloud: 87%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

S
S

 1 / 2 mph 34 / 33°F 69% 992 mb
Low level cloud: 44%
Mid level cloud: 30%
High level cloud: 73%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NE
NE

 1 / 1 mph 34 / 34°F 81% 993 mb
Low level cloud: 93%
Mid level cloud: 44%
High level cloud: 12%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

 2 / 2 mph 35 / 34°F 75% 994 mb
Low level cloud: 27%
Mid level cloud: 9%
High level cloud: 3%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

 4 / 4 mph 35 / 30°F 69% 995 mb
Low level cloud: 7%
Mid level cloud: 1%
High level cloud: 7%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSW
SSW

 7 / 8 mph 33 / 27°F 66% 995 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 3%
Most Significant Cloud Type: medium
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 31
Dec		19:00

NNE
NNE

 7 / 9 mph 33 / 27°F 88% 991 mb
Low level cloud: 82%
Mid level cloud: 64%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
22:00

ENE
ENE

 7 / 8 mph 32 / 26°F 89% 990 mb
Low level cloud: 75%
Mid level cloud: 77%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
Thu 01
Jan		01:00

E
E

 5 / 8 mph 28 / 22°F 89% 988 mb
Low level cloud: 74%
Mid level cloud: 83%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
04:00

ESE
ESE

 4 / 6 mph 28 / 23°F 93% 987 mb
Low level cloud: 82%
Mid level cloud: 80%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SE
SE

 4 / 5 mph 28 / 24°F 89% 987 mb
Low level cloud: 78%
Mid level cloud: 76%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 3 / 4 mph 28 / 24°F 85% 987 mb
Low level cloud: 86%
Mid level cloud: 70%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 3 / 4 mph 28 / 24°F 86% 986 mb
Low level cloud: 87%
Mid level cloud: 59%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NE
NE

 4 / 6 mph 27 / 23°F 90% 987 mb
Low level cloud: 84%
Mid level cloud: 45%
High level cloud: 3%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 2 / 3 mph 28 / 26°F 88% 987 mb
Low level cloud: 83%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 4 / 6 mph 28 / 23°F 76% 988 mb
Low level cloud: 32%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 02
Jan		01:00

SW
SW

 5 / 6 mph 29 / 24°F 66% 989 mb
Low level cloud: 5%
Mid level cloud: 14%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 5 / 8 mph 29 / 23°F 65% 989 mb
Low level cloud: 17%
Mid level cloud: 26%
High level cloud: 2%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 5 / 7 mph 29 / 23°F 63% 989 mb
Low level cloud: 23%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

SE
SE

 1 / 2 mph 30 / 30°F 61% 990 mb
Low level cloud: 44%
Mid level cloud: 43%
High level cloud: 33%
Most Significant Cloud Type: low
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 3 / 4 mph 31 / 29°F 63% 990 mb
Low level cloud: 65%
Mid level cloud: 51%
High level cloud: 41%
Most Significant Cloud Type: low
87%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 3 / 4 mph 31 / 29°F 65% 991 mb
Low level cloud: 63%
Mid level cloud: 49%
High level cloud: 6%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ENE
ENE

 1 / 2 mph 30 / 31°F 65% 991 mb
Low level cloud: 79%
Mid level cloud: 54%
High level cloud: 1%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SSE
SSE

 1 / 2 mph 30 / 30°F 67% 992 mb
Low level cloud: 78%
Mid level cloud: 46%
High level cloud: 2%
Most Significant Cloud Type: low
94%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 03
Jan		01:00

SSW
SSW

 1 / 2 mph 33 / 33°F 68% 993 mb
Low level cloud: 59%
Mid level cloud: 19%
High level cloud: 16%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 2 / 2 mph 34 / 31°F 68% 992 mb
Low level cloud: 44%
Mid level cloud: 23%
High level cloud: 26%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

SSW
SSW

 3 / 3 mph 33 / 31°F 62% 993 mb
Low level cloud: 22%
Mid level cloud: 7%
High level cloud: 12%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

 2 / 3 mph 34 / 32°F 62% 993 mb
Low level cloud: 40%
Mid level cloud: 12%
High level cloud: 19%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

N
N

 6 / 7 mph 34 / 29°F 70% 992 mb
Low level cloud: 87%
Mid level cloud: 25%
High level cloud: 29%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 5 / 6 mph 35 / 30°F 70% 991 mb
Low level cloud: 94%
Mid level cloud: 28%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NNW
NNW

 2 / 2 mph 34 / 33°F 69% 991 mb
Low level cloud: 77%
Mid level cloud: 33%
High level cloud: 33%
Most Significant Cloud Type: low
92%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

S
S

 1 / 1 mph 33 / 33°F 67% 991 mb
Low level cloud: 9%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
71%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 04
Jan		01:00

NW
NW

 2 / 2 mph 34 / 34°F 65% 990 mb
Low level cloud: 0%
Mid level cloud: 99%
High level cloud: 95%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

 3 / 4 mph 34 / 31°F 71% 989 mb
Low level cloud: 8%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: medium
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

 3 / 5 mph 35 / 31°F 70% 989 mb
Low level cloud: 25%
Mid level cloud: 29%
High level cloud: 11%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

 3 / 5 mph 35 / 32°F 63% 989 mb
Low level cloud: 30%
Mid level cloud: 44%
High level cloud: 32%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

 4 / 7 mph 35 / 31°F 65% 989 mb
Low level cloud: 34%
Mid level cloud: 50%
High level cloud: 34%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 4 / 6 mph 35 / 31°F 65% 990 mb
Low level cloud: 61%
Mid level cloud: 50%
High level cloud: 45%
Most Significant Cloud Type: low
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

 4 / 6 mph 35 / 31°F 68% 991 mb
Low level cloud: 73%
Mid level cloud: 43%
High level cloud: 21%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 4 / 5 mph 34 / 31°F 72% 991 mb
Low level cloud: 58%
Mid level cloud: 48%
High level cloud: 9%
Most Significant Cloud Type: low
75%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 05
Jan		01:00

W
W

 4 / 5 mph 36 / 32°F 70% 991 mb
Low level cloud: 43%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

 7 / 8 mph 35 / 30°F 71% 990 mb
Low level cloud: 20%
Mid level cloud: 46%
High level cloud: 15%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

 6 / 7 mph 36 / 30°F 69% 989 mb
Low level cloud: 4%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNW
NNW

 8 / 10 mph 37 / 30°F 77% 987 mb
Low level cloud: 36%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NNW
NNW

 8 / 10 mph 37 / 30°F 88% 986 mb
Low level cloud: 68%
Mid level cloud: 100%
High level cloud: 84%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

NNW
NNW

 6 / 7 mph 37 / 32°F 97% 985 mb
Low level cloud: 91%
Mid level cloud: 100%
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

WNW
WNW

 4 / 6 mph 36 / 33°F 95% 983 mb
Low level cloud: 92%
Mid level cloud: 85%
High level cloud: 41%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

SW
SW

 6 / 10 mph 36 / 31°F 86% 983 mb
Low level cloud: 26%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
42%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Tue 06
Jan		04:00

W
W

 12 / 22 mph 37 / 29°F 83% 985 mb
Low level cloud: 30%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
10:00

WNW
WNW

 17 / 28 mph 37 / 28°F 96% 974 mb
Low level cloud: 68%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
83%
0.0 In
16:00

WSW
WSW

 13 / 22 mph 46 / 40°F 60% 993 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 18%
Most Significant Cloud Type: medium
9%
0.0 In
22:00

NW
NW

 6 / 11 mph 45 / 41°F 79% 991 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
11%
0.0 In
Wed 07
Jan		04:00

WNW
WNW

 5 / 8 mph 39 / 36°F 91% 990 mb
Low level cloud: 77%
Mid level cloud: 62%
High level cloud: 91%
Most Significant Cloud Type: low
100%
0.0 In
10:00

W
W

 4 / 6 mph 42 / 40°F 64% 992 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
47%
0.0 In
16:00

WNW
WNW

 5 / 10 mph 37 / 33°F 98% 987 mb
Low level cloud: 82%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
22:00

W
W

 20 / 36 mph 40 / 30°F 75% 985 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Thu 08
Jan		04:00

WNW
WNW

 12 / 25 mph 34 / 25°F 91% 982 mb
Low level cloud: 13%
Mid level cloud: 45%
High level cloud: 16%
Most Significant Cloud Type: medium
82%
0.0 In
10:00

W
W

 15 / 28 mph 41 / 33°F 77% 993 mb
Low level cloud: 1%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
14%
0.0 In
16:00

WNW
WNW

 15 / 27 mph 42 / 35°F 80% 985 mb
Low level cloud: 1%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
24%
0.0 In
22:00

WSW
WSW

 10 / 18 mph 32 / 24°F 71% 996 mb
Low level cloud: 0%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: medium
39%
0.0 In
Fri 09
Jan		04:00

WNW
WNW

 13 / 23 mph 35 / 27°F 88% 992 mb
Low level cloud: 15%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.2 In
10:00

WNW
WNW

 13 / 23 mph 40 / 33°F 84% 997 mb
Low level cloud: 7%
Mid level cloud: 29%
High level cloud: 4%
Most Significant Cloud Type: medium
47%
0.0 In
16:00

N
N

 6 / 11 mph 43 / 39°F 99% 993 mb
Low level cloud: 90%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
22:00

NNW
NNW

 5 / 10 mph 38 / 34°F 97% 994 mb
Low level cloud: 91%
Mid level cloud: 43%
High level cloud: 9%
Most Significant Cloud Type: low
100%
0.0 In
Sat 10
Jan		04:00

SW
SW

 9 / 17 mph 34 / 26°F 84% 989 mb
Low level cloud: 2%
Mid level cloud: 17%
High level cloud: 5%
Most Significant Cloud Type: medium
23%
0.7 In
10:00

N
N

 4 / 9 mph 40 / 37°F 92% 989 mb
Low level cloud: 67%
Mid level cloud: 97%
High level cloud: 3%
Most Significant Cloud Type: low
100%
0.0 In
16:00

WNW
WNW

 16 / 30 mph 42 / 34°F 79% 997 mb
Low level cloud: 31%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: low
47%
0.1 In
22:00

SW
SW

 11 / 20 mph 39 / 32°F 81% 1000 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.1 In
Sun 11
Jan		04:00

W
W

 8 / 16 mph 33 / 26°F 83% 1001 mb
Low level cloud: 9%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: medium
51%
0.2 In
10:00

WNW
WNW

 9 / 16 mph 40 / 35°F 85% 1003 mb
Low level cloud: 48%
Mid level cloud: 28%
High level cloud: 20%
Most Significant Cloud Type: low
60%
0.0 In
16:00

WSW
WSW

 9 / 18 mph 40 / 33°F 62% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 29%
Most Significant Cloud Type: high
29%
0.1 In
22:00

W
W

 6 / 11 mph 42 / 38°F 89% 1003 mb
Low level cloud: 49%
Mid level cloud: 41%
High level cloud: 33%
Most Significant Cloud Type: low
67%
0.1 In
Mon 12
Jan		04:00

SW
SW

 11 / 24 mph 31 / 22°F 74% 1010 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 2%
Most Significant Cloud Type: medium
7%
0.0 In
10:00

W
W

 4 / 7 mph 42 / 40°F 90% 1001 mb
Low level cloud: 38%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: low
65%
0.1 In
16:00

WSW
WSW

 9 / 17 mph 46 / 42°F 72% 1009 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 84%
Most Significant Cloud Type: medium
48%
0.0 In
22:00

WNW
WNW

 14 / 28 mph 41 / 34°F 95% 994 mb
Low level cloud: 47%
Mid level cloud: 44%
High level cloud: 44%
Most Significant Cloud Type: low
68%
0.0 In
Tue 13
Jan		04:00

NW
NW

 14 / 28 mph 38 / 29°F 97% 995 mb
Low level cloud: 77%
Mid level cloud: 66%
High level cloud: 34%
Most Significant Cloud Type: low
100%
0.2 In
10:00

WNW
WNW

 20 / 39 mph 43 / 35°F 80% 982 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 7%
Most Significant Cloud Type: high
7%
0.2 In
16:00

SW
SW

 13 / 25 mph 47 / 42°F 79% 994 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.3 In
22:00

W
W

 29 / 57 mph 42 / 31°F 72% 991 mb
Low level cloud: 36%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
44%
0.0 In
Wed 14
Jan		04:00

SW
SW

 10 / 20 mph 31 / 22°F 70% 1000 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
0.0 In
10:00

WNW
WNW

 16 / 32 mph 38 / 29°F 92% 990 mb
Low level cloud: 63%
Mid level cloud: 43%
High level cloud: 8%
Most Significant Cloud Type: low
79%
0.3 In
16:00

W
W

 6 / 11 mph 45 / 41°F 76% 998 mb
Low level cloud: 24%
Mid level cloud: 100%
High level cloud: 15%
Most Significant Cloud Type: medium
100%
0.0 In
22:00

WSW
WSW

 17 / 36 mph 37 / 28°F 81% 994 mb
Low level cloud: 2%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
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