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Ponza Island 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Ponza Island

Italy

Long range weather outlook for Ponza Island includes 14 day forecast summary:

Taking a look at Ponza Island over the coming two weeks and the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 23°C expected on the afternoon of Tuesday 30th. The mean minimum temperature will be 15°C, dipping to its lowest on the morning of Wednesday 24th at 12°C. The next 14 days will have some days seeing a little precipitation and some days with rain. It looks like Wednesday 1st will have the most precipitation with an accumulation of around 6.0mm. On the whole winds are likely to be moderate. The forecast suggests the strongest wind will be on the afternoon of Thursday 25th, coming from a westerly direction, and reaching around 26mph. The maximum wind gusts are expected on Thursday morning.

DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 24
Apr		19:00

SW
SW

 13 / 20 mph 56 / 51°F 61% 1007 mb
Low level cloud: 37%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

 8 / 14 mph 54 / 51°F 65% 1009 mb
Low level cloud: 68%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 25
Apr		01:00

WNW
WNW

 15 / 26 mph 53 / 49°F 65% 1008 mb
Low level cloud: 35%
Mid level cloud: 7%
High level cloud: 4%
Most Significant Cloud Type: low
37%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

 10 / 19 mph 53 / 49°F 62% 1008 mb
Low level cloud: 33%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
35%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

 16 / 32 mph 54 / 48°F 64% 1008 mb
Low level cloud: 51%
Mid level cloud: 28%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

 21 / 41 mph 55 / 49°F 63% 1009 mb
Low level cloud: 57%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: low
73%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

WSW
WSW

 26 / 46 mph 56 / 49°F 62% 1009 mb
Low level cloud: 48%
Mid level cloud: 46%
High level cloud: 11%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

 19 / 35 mph 56 / 50°F 60% 1009 mb
Low level cloud: 7%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

 15 / 30 mph 55 / 50°F 59% 1010 mb
Low level cloud: 4%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

 12 / 24 mph 54 / 50°F 59% 1011 mb
Low level cloud: 8%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: medium
45%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 26
Apr		01:00

WSW
WSW

 8 / 14 mph 56 / 54°F 61% 1011 mb
Low level cloud: 26%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: low
53%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

SSW
SSW

 3 / 5 mph 56 / 56°F 64% 1011 mb
Low level cloud: 18%
Mid level cloud: 98%
High level cloud: 96%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

 6 / 12 mph 57 / 54°F 66% 1012 mb
Low level cloud: 8%
Mid level cloud: 40%
High level cloud: 100%
Most Significant Cloud Type: medium
66%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 13 / 22 mph 57 / 53°F 71% 1013 mb
Low level cloud: 26%
Mid level cloud: 33%
High level cloud: 57%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

S
S

 13 / 23 mph 57 / 54°F 71% 1012 mb
Low level cloud: 23%
Mid level cloud: 93%
High level cloud: 14%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSE
SSE

 13 / 25 mph 58 / 54°F 69% 1012 mb
Low level cloud: 19%
Mid level cloud: 21%
High level cloud: 4%
Most Significant Cloud Type: low
26%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 13 / 26 mph 58 / 54°F 69% 1012 mb
Low level cloud: 5%
Mid level cloud: 16%
High level cloud: 4%
Most Significant Cloud Type: medium
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 12 / 24 mph 56 / 53°F 73% 1013 mb
Low level cloud: 0%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 27
Apr		01:00

ESE
ESE

 13 / 21 mph 58 / 56°F 74% 1013 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 11%
Most Significant Cloud Type: medium
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 11 / 21 mph 58 / 55°F 72% 1013 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 12%
Most Significant Cloud Type: medium
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ESE
ESE

 14 / 24 mph 58 / 55°F 75% 1014 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 84%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ESE
ESE

 14 / 22 mph 60 / 56°F 73% 1016 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 33%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ESE
ESE

 11 / 19 mph 62 / 60°F 69% 1016 mb
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 8%
Most Significant Cloud Type: medium
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 8 / 16 mph 62 / 60°F 69% 1015 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 13%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

SE
SE

 7 / 15 mph 61 / 60°F 67% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 15%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 7 / 15 mph 59 / 58°F 64% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 5%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 28
Apr		01:00

E
E

 6 / 9 mph 64 / 64°F 63% 1017 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 7%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

E
E

 9 / 15 mph 62 / 62°F 64% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

ENE
ENE

 12 / 19 mph 63 / 62°F 75% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

ENE
ENE

 4 / 5 mph 68 / 66°F 72% 1017 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

 4 / 5 mph 72 / 69°F 64% 1017 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 2%
Most Significant Cloud Type: high
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SE
SE

 3 / 4 mph 73 / 76°F 64% 1016 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 37%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

N
N

 5 / 8 mph 70 / 68°F 66% 1016 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 100%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

 10 / 20 mph 65 / 65°F 73% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 36%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 29
Apr		01:00

NE
NE

 8 / 15 mph 66 / 66°F 76% 1017 mb
Low level cloud: 0%
Mid level cloud: 18%
High level cloud: 2%
Most Significant Cloud Type: medium
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

E
E

 12 / 21 mph 64 / 64°F 78% 1017 mb
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
07:00

E
E

 10 / 16 mph 66 / 64°F 76% 1017 mb
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
10:00

ESE
ESE

 12 / 14 mph 69 / 68°F 73% 1018 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
13:00

ESE
ESE

 14 / 16 mph 72 / 76°F 72% 1017 mb
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
16:00

SSE
SSE

 13 / 17 mph 73 / 76°F 73% 1017 mb
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
19:00

SE
SE

 11 / 19 mph 71 / 69°F 69% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 9 / 18 mph 67 / 67°F 75% 1017 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
Tue 30
Apr		01:00

E
E

 11 / 21 mph 66 / 66°F 76% 1017 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

ESE
ESE

 11 / 20 mph 65 / 65°F 81% 1016 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
07:00

ESE
ESE

 14 / 24 mph 66 / 65°F 79% 1017 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
10:00

ESE
ESE

 15 / 17 mph 70 / 69°F 79% 1016 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
13:00

SE
SE

 13 / 15 mph 73 / 76°F 78% 1016 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
16:00

ESE
ESE

 13 / 15 mph 73 / 76°F 72% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 66%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

E
E

 16 / 22 mph 71 / 70°F 75% 1011 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 17%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ESE
ESE

 17 / 34 mph 68 / 67°F 69% 1010 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 12%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust		Temp/
Feels Like		HumidityPressureCloud AmountPrecip AmountWeather
Wed 01
May		01:00

NE
NE

 9 / 19 mph 58 / 56°F 87% 1007 mb
Low level cloud: 6%
Mid level cloud: 80%
High level cloud: 1%
Most Significant Cloud Type: medium
97%
0.0 In
07:00

E
E

 10 / 21 mph 67 / 67°F 74% 1013 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 4%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

ESE
ESE

 15 / 32 mph 67 / 67°F 79% 1011 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: medium
45%
0.0 In
19:00

ESE
ESE

 10 / 21 mph 69 / 69°F 83% 1006 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
0.0 In
Thu 02
May		01:00

SE
SE

 10 / 21 mph 61 / 61°F 89% 1009 mb
Low level cloud: 33%
Mid level cloud: 18%
High level cloud: 0%
Most Significant Cloud Type: low
39%
0.0 In
07:00

S
S

 19 / 40 mph 59 / 55°F 85% 1008 mb
Low level cloud: 66%
Mid level cloud: 14%
High level cloud: 1%
Most Significant Cloud Type: low
70%
0.0 In
13:00

SW
SW

 4 / 9 mph 62 / 62°F 79% 1014 mb
Low level cloud: 2%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

W
W

 9 / 18 mph 61 / 61°F 66% 1012 mb
Low level cloud: 0%
Mid level cloud: 11%
High level cloud: 11%
Most Significant Cloud Type: medium
11%
0.0 In
Fri 03
May		01:00

NW
NW

 4 / 8 mph 58 / 58°F 78% 1012 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 14%
Most Significant Cloud Type: medium
12%
0.0 In
07:00

E
E

 8 / 17 mph 58 / 56°F 64% 1013 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
4%
0.0 In
13:00

N
N

 8 / 16 mph 61 / 61°F 85% 1009 mb
Low level cloud: 12%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
81%
0.1 In
19:00

S
S

 10 / 20 mph 60 / 60°F 71% 1013 mb
Low level cloud: 0%
Mid level cloud: 90%
High level cloud: 100%
Most Significant Cloud Type: medium
94%
0.0 In
Sat 04
May		01:00

NNW
NNW

 7 / 16 mph 58 / 57°F 82% 1008 mb
Low level cloud: 14%
Mid level cloud: 46%
High level cloud: 32%
Most Significant Cloud Type: medium
85%
0.1 In
07:00

SSW
SSW

 14 / 29 mph 57 / 53°F 75% 1013 mb
Low level cloud: 24%
Mid level cloud: 51%
High level cloud: 32%
Most Significant Cloud Type: low
46%
0.2 In
13:00

WNW
WNW

 20 / 42 mph 61 / 61°F 74% 1011 mb
Low level cloud: 13%
Mid level cloud: 11%
High level cloud: 0%
Most Significant Cloud Type: low
16%
0.1 In
19:00

SW
SW

 9 / 19 mph 60 / 60°F 78% 1014 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 9%
Most Significant Cloud Type: medium
5%
0.1 In
Sun 05
May		01:00

W
W

 15 / 32 mph 59 / 56°F 75% 1013 mb
Low level cloud: 5%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
6%
0.0 In
07:00

ENE
ENE

 3 / 6 mph 59 / 59°F 72% 1014 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.1 In
13:00

W
W

 13 / 28 mph 60 / 60°F 77% 1015 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
19:00

W
W

 14 / 30 mph 62 / 62°F 66% 1015 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 18%
Most Significant Cloud Type: medium
3%
0.0 In
Mon 06
May		01:00

SSE
SSE

 6 / 13 mph 61 / 61°F 76% 1016 mb
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: medium
22%
0.0 In
07:00

W
W

 11 / 24 mph 57 / 55°F 65% 1015 mb
Low level cloud: 32%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: low
37%
0.0 In
13:00

SE
SE

 11 / 24 mph 64 / 64°F 81% 1017 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
0.0 In
19:00

WSW
WSW

 10 / 21 mph 60 / 60°F 68% 1014 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: medium
8%
0.0 In
Tue 07
May		01:00

SE
SE

 9 / 19 mph 63 / 63°F 79% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 17%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

WSW
WSW

 5 / 11 mph 59 / 59°F 62% 1013 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
13:00

S
S

 3 / 6 mph 66 / 66°F 68% 1014 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 31%
Most Significant Cloud Type: medium
4%
0.0 In
19:00

WSW
WSW

 13 / 26 mph 63 / 63°F 79% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: high
0%
0.0 In
Wed 08
May		01:00

NNE
NNE

 6 / 13 mph 62 / 62°F 70% 1013 mb
Low level cloud: 0%
Mid level cloud: 38%
High level cloud: 33%
Most Significant Cloud Type: medium
39%
0.0 In
07:00

WNW
WNW

 8 / 16 mph 58 / 57°F 68% 1013 mb
Low level cloud: 85%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.0 In
13:00

WSW
WSW

 7 / 14 mph 67 / 67°F 70% 1015 mb
Low level cloud: 0%
Mid level cloud: 62%
High level cloud: 100%
Most Significant Cloud Type: medium
66%
0.0 In
19:00

SSW
SSW

 3 / 7 mph 59 / 59°F 59% 1016 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 85%
Most Significant Cloud Type: high
84%
0.0 In
Thu 09
May		01:00

NNW
NNW

 11 / 23 mph 57 / 55°F 84% 1013 mb
Low level cloud: 9%
Mid level cloud: 32%
High level cloud: 21%
Most Significant Cloud Type: medium
57%
0.2 In
07:00

ESE
ESE

 1 / 2 mph 61 / 61°F 63% 1016 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
9%
0.0 In
13:00

NW
NW

 9 / 19 mph 62 / 62°F 63% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: high
11%
0.0 In
19:00

SSE
SSE

 10 / 21 mph 64 / 64°F 74% 1015 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 62%
Most Significant Cloud Type: medium
15%
0.0 In

Other Locations Near to Ponza Island

Cities and Towns: Terracina, Italy

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