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Calella 14 Day Long Range Forecast

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

Spain

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

Reviewing the forecast for Calella Over the next 14 days and the average daytime maximum temperature will be around 16°C, with a high for the two weeks of 18°C expected on the afternoon of Sunday 7th. The average minimum temperature will be 11°C, dipping to its lowest on the morning of Saturday 6th at 10°C. Expect the following 14 days ahead to remain predominantly dry. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 06
Dec
16:00

ESE
ESE

2 / 3 mph 62 / 61°F 58% 1017 mb
Low level cloud: 4%
Mid level cloud: 21%
High level cloud: 0%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

ESE
ESE

0 / 0 mph 55 / 55°F 71% 1019 mb
Low level cloud: 5%
Mid level cloud: 33%
High level cloud: 5%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

4 / 9 mph 54 / 53°F 75% 1020 mb
Low level cloud: 28%
Mid level cloud: 25%
High level cloud: 29%
Most Significant Cloud Type: low
40%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 07
Dec
01:00

WSW
WSW

5 / 11 mph 53 / 52°F 79% 1020 mb
Low level cloud: 11%
Mid level cloud: 5%
High level cloud: 14%
Most Significant Cloud Type: low
14%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

5 / 9 mph 53 / 52°F 82% 1020 mb
Low level cloud: 5%
Mid level cloud: 2%
High level cloud: 18%
Most Significant Cloud Type: low
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

4 / 9 mph 53 / 52°F 83% 1019 mb
Low level cloud: 9%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

W
W

7 / 9 mph 58 / 56°F 73% 1020 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

7 / 9 mph 64 / 64°F 62% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 32%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

WSW
WSW

5 / 7 mph 64 / 64°F 65% 1018 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NW
NW

6 / 12 mph 58 / 57°F 70% 1019 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

N
N

5 / 10 mph 56 / 56°F 73% 1021 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 08
Dec
01:00

NNW
NNW

4 / 8 mph 55 / 55°F 74% 1021 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 2%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

NW
NW

4 / 8 mph 54 / 54°F 76% 1021 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

WNW
WNW

3 / 7 mph 53 / 53°F 78% 1021 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

W
W

3 / 4 mph 59 / 60°F 71% 1022 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

SSW
SSW

6 / 7 mph 64 / 63°F 62% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 2%
Most Significant Cloud Type: high
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SSW
SSW

9 / 11 mph 62 / 62°F 69% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WSW
WSW

7 / 15 mph 56 / 54°F 79% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: high
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WSW
WSW

6 / 13 mph 54 / 53°F 76% 1022 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
Tue 09
Dec
01:00

WSW
WSW

7 / 15 mph 53 / 51°F 72% 1021 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

WSW
WSW

8 / 17 mph 52 / 49°F 69% 1021 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

WSW
WSW

7 / 15 mph 52 / 49°F 69% 1021 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

WSW
WSW

8 / 12 mph 57 / 55°F 64% 1021 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

SW
SW

11 / 13 mph 64 / 64°F 60% 1021 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

SW
SW

11 / 13 mph 63 / 62°F 74% 1020 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
19:00

SW
SW

12 / 23 mph 55 / 52°F 86% 1020 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
22:00

WSW
WSW

11 / 22 mph 54 / 51°F 83% 1020 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
Wed 10
Dec
01:00

WSW
WSW

10 / 20 mph 54 / 51°F 78% 1019 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

WSW
WSW

9 / 18 mph 53 / 50°F 77% 1019 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 1%
Most Significant Cloud Type: high
0%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WSW
WSW

7 / 15 mph 52 / 50°F 76% 1019 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 10%
Most Significant Cloud Type: high
10%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

3 / 4 mph 57 / 57°F 68% 1020 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 10%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

1 / 1 mph 63 / 62°F 59% 1020 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 33%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ENE
ENE

5 / 6 mph 63 / 62°F 68% 1020 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 33%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

10 / 17 mph 54 / 51°F 81% 1023 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 10%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

8 / 14 mph 53 / 51°F 81% 1024 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 1%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 11
Dec
01:00

NNE
NNE

7 / 13 mph 52 / 50°F 83% 1024 mb
Low level cloud: 0%
Mid level cloud: 13%
High level cloud: 93%
Most Significant Cloud Type: medium
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

6 / 12 mph 52 / 50°F 80% 1024 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 98%
Most Significant Cloud Type: medium
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

NNE
NNE

6 / 11 mph 52 / 50°F 76% 1024 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 70%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

6 / 7 mph 57 / 56°F 70% 1024 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 21%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

5 / 6 mph 62 / 61°F 64% 1023 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 4%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

ESE
ESE

5 / 6 mph 62 / 61°F 74% 1022 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
19:00

ENE
ENE

3 / 5 mph 55 / 55°F 88% 1023 mb
Low level cloud: 9%
Mid level cloud: 4%
High level cloud: 16%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NNE
NNE

3 / 5 mph 54 / 54°F 89% 1024 mb
Low level cloud: 11%
Mid level cloud: 5%
High level cloud: 6%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 12
Dec
01:00

N
N

3 / 5 mph 52 / 52°F 88% 1023 mb
Low level cloud: 10%
Mid level cloud: 4%
High level cloud: 7%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

N
N

3 / 5 mph 51 / 51°F 88% 1023 mb
Low level cloud: 34%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: low
36%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

N
N

3 / 6 mph 50 / 50°F 88% 1022 mb
Low level cloud: 38%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
39%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NNE
NNE

4 / 5 mph 57 / 56°F 85% 1022 mb
Low level cloud: 57%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

ENE
ENE

6 / 7 mph 62 / 62°F 82% 1021 mb
Low level cloud: 50%
Mid level cloud: 5%
High level cloud: 2%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

E
E

7 / 8 mph 62 / 61°F 77% 1020 mb
Low level cloud: 59%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

NE
NE

6 / 10 mph 54 / 53°F 82% 1020 mb
Low level cloud: 59%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

ENE
ENE

7 / 11 mph 55 / 53°F 81% 1021 mb
Low level cloud: 61%
Mid level cloud: 48%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sat 13
Dec
01:00

W
W

5 / 5 mph 59 / 59°F 86% 1023 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
7%
0.0 In
07:00

WSW
WSW

6 / 9 mph 56 / 55°F 87% 1022 mb
Low level cloud: 1%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
8%
0.0 In
13:00

SSW
SSW

8 / 11 mph 62 / 62°F 72% 1012 mb
Low level cloud: 0%
Mid level cloud: 15%
High level cloud: 10%
Most Significant Cloud Type: medium
15%
0.0 In
19:00

ENE
ENE

2 / 4 mph 60 / 60°F 92% 1018 mb
Low level cloud: 10%
Mid level cloud: 68%
High level cloud: 100%
Most Significant Cloud Type: medium
99%
0.0 In
Sun 14
Dec
01:00

SW
SW

2 / 5 mph 58 / 59°F 91% 1008 mb
Low level cloud: 60%
Mid level cloud: 40%
High level cloud: 0%
Most Significant Cloud Type: low
74%
0.0 In
07:00

NNE
NNE

9 / 15 mph 54 / 51°F 91% 1030 mb
Low level cloud: 28%
Mid level cloud: 44%
High level cloud: 33%
Most Significant Cloud Type: low
47%
0.0 In
13:00

NNE
NNE

4 / 8 mph 63 / 63°F 81% 1021 mb
Low level cloud: 0%
Mid level cloud: 31%
High level cloud: 48%
Most Significant Cloud Type: medium
33%
0.0 In
19:00

NE
NE

5 / 11 mph 58 / 58°F 87% 1013 mb
Low level cloud: 23%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
0.0 In
Mon 15
Dec
01:00

WNW
WNW

4 / 8 mph 59 / 59°F 83% 1018 mb
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 78%
Most Significant Cloud Type: medium
32%
0.0 In
07:00

NNE
NNE

4 / 8 mph 54 / 54°F 83% 1006 mb
Low level cloud: 36%
Mid level cloud: 69%
High level cloud: 2%
Most Significant Cloud Type: low
60%
0.1 In
13:00

WSW
WSW

8 / 14 mph 63 / 64°F 63% 1013 mb
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 32%
Most Significant Cloud Type: medium
10%
0.0 In
19:00

ENE
ENE

9 / 20 mph 56 / 54°F 88% 1005 mb
Low level cloud: 35%
Mid level cloud: 45%
High level cloud: 1%
Most Significant Cloud Type: low
50%
0.2 In
Tue 16
Dec
01:00

N
N

4 / 6 mph 55 / 55°F 80% 1012 mb
Low level cloud: 45%
Mid level cloud: 74%
High level cloud: 0%
Most Significant Cloud Type: low
70%
0.0 In
07:00

NE
NE

12 / 26 mph 51 / 46°F 91% 1013 mb
Low level cloud: 69%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: low
85%
0.2 In
13:00

N
N

1 / 3 mph 61 / 62°F 62% 1017 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

NNE
NNE

11 / 22 mph 53 / 50°F 87% 1019 mb
Low level cloud: 5%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
38%
0.0 In
Wed 17
Dec
01:00

W
W

6 / 11 mph 52 / 51°F 80% 1020 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
0.0 In
07:00

N
N

7 / 15 mph 50 / 47°F 79% 1020 mb
Low level cloud: 10%
Mid level cloud: 17%
High level cloud: 0%
Most Significant Cloud Type: low
15%
0.0 In
13:00

WSW
WSW

19 / 36 mph 64 / 64°F 68% 1014 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: medium
10%
0.0 In
19:00

N
N

3 / 6 mph 56 / 56°F 78% 1020 mb
Low level cloud: 5%
Mid level cloud: 25%
High level cloud: 66%
Most Significant Cloud Type: medium
42%
0.0 In
Thu 18
Dec
01:00

SE
SE

10 / 19 mph 59 / 59°F 81% 1011 mb
Low level cloud: 82%
Mid level cloud: 44%
High level cloud: 0%
Most Significant Cloud Type: low
97%
0.0 In
07:00

N
N

9 / 19 mph 48 / 43°F 57% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
13:00

W
W

24 / 47 mph 62 / 62°F 64% 1001 mb
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 86%
Most Significant Cloud Type: medium
32%
0.0 In
19:00

N
N

13 / 27 mph 51 / 47°F 45% 1025 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Fri 19
Dec
01:00

WNW
WNW

8 / 15 mph 48 / 44°F 68% 1009 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

NNE
NNE

12 / 24 mph 49 / 45°F 44% 1026 mb
Low level cloud: 35%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
45%
0.0 In
13:00

NNW
NNW

16 / 32 mph 55 / 51°F 35% 1014 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

12 / 24 mph 55 / 51°F 58% 1026 mb
Low level cloud: 95%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
Sat 20
Dec
01:00

WSW
WSW

8 / 17 mph 46 / 41°F 50% 1020 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
07:00

NNE
NNE

10 / 20 mph 51 / 47°F 81% 1026 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
13:00

SW
SW

6 / 11 mph 52 / 50°F 45% 1025 mb
Low level cloud: 0%
Mid level cloud: 75%
High level cloud: 0%
Most Significant Cloud Type: medium
75%
0.0 In
19:00

NNE
NNE

9 / 19 mph 57 / 55°F 86% 1024 mb
Low level cloud: 46%
Mid level cloud: 23%
High level cloud: 0%
Most Significant Cloud Type: low
54%
0.0 In
Sun 21
Dec
01:00

W
W

4 / 8 mph 52 / 51°F 58% 1026 mb
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 62%
Most Significant Cloud Type: medium
55%
0.0 In
07:00

NNE
NNE

8 / 17 mph 51 / 48°F 82% 1023 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 9%
Most Significant Cloud Type: medium
7%
0.0 In
13:00

S
S

2 / 3 mph 67 / 67°F 59% 1023 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 3%
Most Significant Cloud Type: medium
12%
0.0 In
19:00

NNE
NNE

12 / 25 mph 55 / 51°F 65% 1024 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 33%
Most Significant Cloud Type: medium
10%
0.0 In

Other Locations Near to Calella

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