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Walton Grounds 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Walton Grounds

Northamptonshire, United Kingdom

Long range weather outlook for Walton Grounds includes 14 day forecast summary:

Over the next 14 days the Walton Grounds forecast suggests the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 20°C expected on the afternoon of Friday 17th. The mean minimum temperature will be 10°C, dipping to its lowest on the morning of Monday 20th at 6°C. The fortnight ahead will have most days seeing a little rain. The current forecast indicates Wednesday 22nd will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityCloud AmountPrecip AmountWeather
Fri 17
May		03:00

SSE
SSE

 4 / 7 mph 54 / 53°F 92%
Low level cloud: 6%
Mid level cloud: 27%
High level cloud: 100%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

 3 / 5 mph 54 / 53°F 93%
Low level cloud: 10%
Mid level cloud: 18%
High level cloud: 33%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

S
S

 2 / 3 mph 62 / 60°F 78%
Low level cloud: 17%
Mid level cloud: 16%
High level cloud: 100%
Most Significant Cloud Type: low
34%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

SSE
SSE

 4 / 5 mph 66 / 64°F 67%
Low level cloud: 23%
Mid level cloud: 13%
High level cloud: 6%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

SW
SW

 1 / 2 mph 69 / 66°F 64%
Low level cloud: 37%
Mid level cloud: 4%
High level cloud: 10%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

N
N

 4 / 5 mph 67 / 65°F 82%
Low level cloud: 5%
Mid level cloud: 15%
High level cloud: 7%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NE
NE

 5 / 9 mph 57 / 56°F 91%
Low level cloud: 6%
Mid level cloud: 32%
High level cloud: 100%
Most Significant Cloud Type: medium
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 18
May		00:00

NE
NE

 5 / 10 mph 54 / 53°F 96%
Low level cloud: 21%
Mid level cloud: 26%
High level cloud: 60%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 6 / 11 mph 52 / 50°F 96%
Low level cloud: 64%
Mid level cloud: 28%
High level cloud: 93%
Most Significant Cloud Type: low
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 8 / 12 mph 53 / 49°F 96%
Low level cloud: 56%
Mid level cloud: 46%
High level cloud: 76%
Most Significant Cloud Type: low
81%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 10 / 14 mph 55 / 53°F 92%
Low level cloud: 95%
Mid level cloud: 40%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 7 / 11 mph 57 / 55°F 93%
Low level cloud: 87%
Mid level cloud: 46%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 9 / 13 mph 64 / 63°F 80%
Low level cloud: 89%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNE
NNE

 9 / 14 mph 64 / 62°F 90%
Low level cloud: 9%
Mid level cloud: 29%
High level cloud: 5%
Most Significant Cloud Type: medium
53%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNE
NNE

 9 / 15 mph 54 / 52°F 97%
Low level cloud: 35%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 19
May		00:00

NNE
NNE

 7 / 14 mph 49 / 46°F 97%
Low level cloud: 23%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 7 / 13 mph 48 / 44°F 96%
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 8 / 13 mph 49 / 45°F 95%
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 11 / 14 mph 59 / 56°F 79%
Low level cloud: 15%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: low
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 12 / 15 mph 64 / 63°F 69%
Low level cloud: 51%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NE
NE

 13 / 18 mph 65 / 64°F 67%
Low level cloud: 29%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 12 / 16 mph 62 / 61°F 80%
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
21:00

NNE
NNE

 9 / 15 mph 51 / 48°F 95%
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 20
May		00:00

NNE
NNE

 10 / 16 mph 48 / 43°F 98%
Low level cloud: 68%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NNE
NNE

 9 / 15 mph 45 / 40°F 97%
Low level cloud: 78%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 10 / 14 mph 47 / 41°F 94%
Low level cloud: 54%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
55%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNE
NNE

 13 / 16 mph 55 / 51°F 76%
Low level cloud: 29%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 13 / 15 mph 61 / 60°F 70%
Low level cloud: 54%
Mid level cloud: 9%
High level cloud: 1%
Most Significant Cloud Type: low
57%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNE
NNE

 13 / 17 mph 62 / 60°F 68%
Low level cloud: 23%
Mid level cloud: 20%
High level cloud: 9%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 10 / 15 mph 57 / 54°F 79%
Low level cloud: 0%
Mid level cloud: 82%
High level cloud: 32%
Most Significant Cloud Type: medium
83%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNE
NNE

 6 / 10 mph 52 / 48°F 87%
Low level cloud: 42%
Mid level cloud: 82%
High level cloud: 32%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 21
May		00:00

NNE
NNE

 6 / 9 mph 49 / 47°F 93%
Low level cloud: 96%
Mid level cloud: 71%
High level cloud: 44%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

N
N

 5 / 7 mph 48 / 46°F 94%
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

N
N

 4 / 6 mph 49 / 47°F 94%
Low level cloud: 98%
Mid level cloud: 26%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

N
N

 3 / 5 mph 51 / 50°F 94%
Low level cloud: 95%
Mid level cloud: 19%
High level cloud: 61%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNE
NNE

 3 / 4 mph 54 / 55°F 89%
Low level cloud: 97%
Mid level cloud: 16%
High level cloud: 18%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

N
N

 2 / 2 mph 59 / 58°F 80%
Low level cloud: 81%
Mid level cloud: 27%
High level cloud: 45%
Most Significant Cloud Type: low
95%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NE
NE

 2 / 3 mph 62 / 59°F 81%
Low level cloud: 29%
Mid level cloud: 44%
High level cloud: 2%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

 2 / 4 mph 58 / 57°F 90%
Low level cloud: 41%
Mid level cloud: 46%
High level cloud: 22%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 22
May		00:00

WNW
WNW

 3 / 6 mph 54 / 54°F 93%
Low level cloud: 32%
Mid level cloud: 67%
High level cloud: 76%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

 5 / 10 mph 52 / 51°F 89%
Low level cloud: 7%
Mid level cloud: 78%
High level cloud: 32%
Most Significant Cloud Type: medium
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

 7 / 11 mph 53 / 49°F 93%
Low level cloud: 24%
Mid level cloud: 49%
High level cloud: 32%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

 7 / 10 mph 56 / 54°F 86%
Low level cloud: 76%
Mid level cloud: 51%
High level cloud: 52%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

 9 / 12 mph 58 / 55°F 88%
Low level cloud: 71%
Mid level cloud: 46%
High level cloud: 38%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

 9 / 13 mph 61 / 59°F 86%
Low level cloud: 4%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: medium
83%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
18:00

W
W

 7 / 11 mph 61 / 59°F 88%
Low level cloud: 1%
Mid level cloud: 47%
High level cloud: 26%
Most Significant Cloud Type: medium
49%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

W
W

 6 / 12 mph 55 / 52°F 92%
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 21%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 23
May		00:00

WNW
WNW

 5 / 9 mph 50 / 49°F 93%
Low level cloud: 3%
Mid level cloud: 13%
High level cloud: 15%
Most Significant Cloud Type: medium
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

 4 / 7 mph 48 / 47°F 94%
Low level cloud: 10%
Mid level cloud: 28%
High level cloud: 21%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NNW
NNW

 4 / 6 mph 51 / 49°F 94%
Low level cloud: 28%
Mid level cloud: 44%
High level cloud: 19%
Most Significant Cloud Type: low
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

 7 / 9 mph 58 / 56°F 81%
Low level cloud: 79%
Mid level cloud: 23%
High level cloud: 33%
Most Significant Cloud Type: low
91%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

 8 / 10 mph 62 / 61°F 73%
Low level cloud: 61%
Mid level cloud: 42%
High level cloud: 32%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

 6 / 9 mph 65 / 62°F 75%
Low level cloud: 31%
Mid level cloud: 32%
High level cloud: 32%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

 5 / 7 mph 60 / 60°F 87%
Low level cloud: 15%
Mid level cloud: 68%
High level cloud: 32%
Most Significant Cloud Type: medium
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
21:00

NNW
NNW

 8 / 15 mph 55 / 52°F 93%
Low level cloud: 9%
Mid level cloud: 44%
High level cloud: 50%
Most Significant Cloud Type: medium
71%
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		00:00

NNW
NNW

 8 / 16 mph 49 / 45°F 98%
Low level cloud: 89%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

N
N

 3 / 5 mph 51 / 51°F 88%
Low level cloud: 7%
Mid level cloud: 71%
High level cloud: 100%
Most Significant Cloud Type: medium
96%
0.0 In
12:00

ENE
ENE

 12 / 26 mph 57 / 55°F 86%
Low level cloud: 95%
Mid level cloud: 91%
High level cloud: 37%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SE
SE

 6 / 13 mph 65 / 65°F 87%
Low level cloud: 12%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In
Sat 25
May		00:00

NNE
NNE

 13 / 28 mph 51 / 47°F 98%
Low level cloud: 84%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
90%
0.0 In
06:00

NW
NW

 4 / 8 mph 59 / 59°F 93%
Low level cloud: 11%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: low
14%
0.0 In
12:00

ENE
ENE

 17 / 36 mph 65 / 65°F 73%
Low level cloud: 32%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
18:00

W
W

 10 / 21 mph 61 / 61°F 87%
Low level cloud: 64%
Mid level cloud: 31%
High level cloud: 100%
Most Significant Cloud Type: low
87%
0.0 In
Sun 26
May		00:00

ENE
ENE

 10 / 21 mph 50 / 47°F 96%
Low level cloud: 41%
Mid level cloud: 23%
High level cloud: 1%
Most Significant Cloud Type: low
48%
0.0 In
06:00

WSW
WSW

 8 / 17 mph 57 / 55°F 98%
Low level cloud: 81%
Mid level cloud: 88%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.0 In
12:00

E
E

 14 / 30 mph 61 / 61°F 87%
Low level cloud: 83%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.1 In
18:00

NW
NW

 6 / 12 mph 63 / 63°F 92%
Low level cloud: 72%
Mid level cloud: 44%
High level cloud: 4%
Most Significant Cloud Type: low
87%
0.1 In
Mon 27
May		00:00

NE
NE

 6 / 12 mph 55 / 54°F 98%
Low level cloud: 71%
Mid level cloud: 25%
High level cloud: 0%
Most Significant Cloud Type: low
80%
0.2 In
06:00

NW
NW

 5 / 10 mph 55 / 54°F 87%
Low level cloud: 0%
Mid level cloud: 20%
High level cloud: 3%
Most Significant Cloud Type: medium
19%
0.0 In
12:00

NE
NE

 16 / 33 mph 64 / 64°F 70%
Low level cloud: 29%
Mid level cloud: 17%
High level cloud: 33%
Most Significant Cloud Type: low
39%
0.0 In
18:00

WSW
WSW

 5 / 11 mph 68 / 68°F 83%
Low level cloud: 36%
Mid level cloud: 26%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.0 In
Tue 28
May		00:00

NNE
NNE

 7 / 15 mph 49 / 46°F 88%
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 33%
Most Significant Cloud Type: medium
28%
0.0 In
06:00

SSW
SSW

 8 / 16 mph 57 / 56°F 95%
Low level cloud: 64%
Mid level cloud: 49%
High level cloud: 78%
Most Significant Cloud Type: low
90%
0.0 In
12:00

NE
NE

 7 / 14 mph 65 / 65°F 67%
Low level cloud: 21%
Mid level cloud: 6%
High level cloud: 13%
Most Significant Cloud Type: low
24%
0.0 In
18:00

NNW
NNW

 13 / 27 mph 47 / 42°F 97%
Low level cloud: 75%
Mid level cloud: 68%
High level cloud: 5%
Most Significant Cloud Type: low
99%
0.2 In
Wed 29
May		00:00

NE
NE

 6 / 13 mph 51 / 49°F 97%
Low level cloud: 22%
Mid level cloud: 1%
High level cloud: 1%
Most Significant Cloud Type: low
22%
0.0 In
06:00

WNW
WNW

 10 / 21 mph 45 / 39°F 94%
Low level cloud: 24%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
25%
0.0 In
12:00

NE
NE

 8 / 17 mph 63 / 63°F 71%
Low level cloud: 55%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
55%
0.0 In
18:00

WNW
WNW

 10 / 21 mph 54 / 51°F 80%
Low level cloud: 1%
Mid level cloud: 45%
High level cloud: 0%
Most Significant Cloud Type: medium
47%
0.0 In
Thu 30
May		00:00

NE
NE

 7 / 15 mph 51 / 48°F 98%
Low level cloud: 44%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
06:00

WNW
WNW

 6 / 13 mph 48 / 46°F 90%
Low level cloud: 14%
Mid level cloud: 22%
High level cloud: 0%
Most Significant Cloud Type: low
21%
0.0 In
12:00

NE
NE

 13 / 28 mph 66 / 66°F 73%
Low level cloud: 85%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In
18:00

WSW
WSW

 4 / 9 mph 62 / 62°F 77%
Low level cloud: 18%
Mid level cloud: 10%
High level cloud: 20%
Most Significant Cloud Type: low
24%
0.0 In
Fri 31
May		00:00

NNE
NNE

 11 / 23 mph 50 / 46°F 96%
Low level cloud: 22%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
23%
0.0 In
06:00

S
S

 12 / 25 mph 49 / 44°F 93%
Low level cloud: 44%
Mid level cloud: 51%
High level cloud: 44%
Most Significant Cloud Type: low
67%
0.0 In
12:00

NE
NE

 15 / 32 mph 63 / 63°F 68%
Low level cloud: 28%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
28%
0.0 In
18:00

SSW
SSW

 10 / 21 mph 54 / 51°F 99%
Low level cloud: 96%
Mid level cloud: 63%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
Sat 01
Jun		00:00

N
N

 10 / 21 mph 48 / 44°F 93%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: medium
6%
0.0 In
06:00

SW
SW

 6 / 13 mph 51 / 49°F 94%
Low level cloud: 38%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
38%
0.0 In
12:00

NNE
NNE

 13 / 27 mph 59 / 56°F 78%
Low level cloud: 2%
Mid level cloud: 59%
High level cloud: 38%
Most Significant Cloud Type: medium
65%
0.0 In
18:00

SSW
SSW

 14 / 30 mph 55 / 51°F 81%
Low level cloud: 6%
Mid level cloud: 16%
High level cloud: 32%
Most Significant Cloud Type: low
16%
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