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Fira de Barcelona: Montjuic venue 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Fira de Barcelona: Montjuic venue

Spain

Long range weather outlook for Fira de Barcelona: Montjuic venue includes 14 day forecast summary:

The next 14 day outlook for Fira de Barcelona: Montjuic venue shows the average daytime maximum temperature will be around 13°C, with a high for the two weeks of 17°C expected on the afternoon of Tuesday 27th. The average minimum temperature will be 9°C, dipping to its lowest on the morning of Saturday 24th at 7°C. The next 14 days will have mixed overhead conditions with some days dry and some seeing a significant amount of rain. The current forecast indicates Saturday 24th will have the most precipitation with an accumulation of around 7.0mm. On the whole winds are likely to be moderate. The strongest wind will be felt on the evening of Sunday 25th, coming from a north westerly direction, and reaching around 31mph.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 22
Jan
19:00

WNW
WNW

9 / 13 mph 55 / 52°F 70% 1000 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 2%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

6 / 8 mph 53 / 51°F 74% 1001 mb
Low level cloud: 33%
Mid level cloud: 33%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 23
Jan
01:00

W
W

8 / 13 mph 52 / 49°F 65% 1001 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
04:00

W
W

9 / 13 mph 50 / 47°F 64% 999 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 37%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

W
W

10 / 16 mph 49 / 45°F 66% 998 mb
Low level cloud: 24%
Mid level cloud: 44%
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

WSW
WSW

13 / 16 mph 53 / 48°F 70% 998 mb
Low level cloud: 7%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

W
W

18 / 23 mph 55 / 51°F 54% 998 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

16 / 22 mph 56 / 51°F 49% 997 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

WNW
WNW

13 / 14 mph 56 / 52°F 46% 998 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

5 / 6 mph 54 / 52°F 47% 999 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 24
Jan
01:00

SE
SE

4 / 8 mph 47 / 46°F 58% 997 mb
Low level cloud: 0%
Mid level cloud: 60%
High level cloud: 85%
Most Significant Cloud Type: medium
62%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WSW
WSW

8 / 14 mph 46 / 42°F 78% 995 mb
Low level cloud: 95%
Mid level cloud: 61%
High level cloud: 78%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
07:00

NNW
NNW

5 / 9 mph 45 / 42°F 79% 993 mb
Low level cloud: 35%
Mid level cloud: 49%
High level cloud: 84%
Most Significant Cloud Type: low
61%
Expect 0.2 In of precipitation over the past 3 hours.
0.2 In
10:00

W
W

15 / 18 mph 48 / 42°F 73% 996 mb
Low level cloud: 34%
Mid level cloud: 89%
High level cloud: 91%
Most Significant Cloud Type: low
76%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
13:00

WNW
WNW

16 / 19 mph 51 / 45°F 61% 996 mb
Low level cloud: 73%
Mid level cloud: 49%
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

W
W

18 / 22 mph 51 / 45°F 52% 996 mb
Low level cloud: 0%
Mid level cloud: 16%
High level cloud: 95%
Most Significant Cloud Type: medium
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

19 / 24 mph 50 / 44°F 55% 998 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

NW
NW

14 / 17 mph 48 / 43°F 66% 1000 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 33%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 25
Jan
01:00

NW
NW

12 / 15 mph 47 / 41°F 64% 1001 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 11%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

11 / 16 mph 45 / 40°F 65% 1002 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 13%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

16 / 25 mph 46 / 40°F 62% 1001 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 17%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

NW
NW

14 / 18 mph 46 / 39°F 63% 1003 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 13%
Most Significant Cloud Type: high
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WNW
WNW

18 / 29 mph 51 / 45°F 52% 1002 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
3%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

21 / 35 mph 54 / 48°F 52% 999 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
19:00

WNW
WNW

31 / 55 mph 52 / 45°F 48% 999 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
22:00

NW
NW

22 / 32 mph 49 / 42°F 55% 1001 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 5%
Most Significant Cloud Type: high
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 26
Jan
01:00

WNW
WNW

27 / 46 mph 47 / 38°F 62% 1002 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

26 / 43 mph 46 / 37°F 70% 1003 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

NW
NW

20 / 32 mph 46 / 38°F 68% 1004 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
10:00

NW
NW

13 / 16 mph 49 / 44°F 63% 1006 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 7%
Most Significant Cloud Type: high
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

NW
NW

11 / 17 mph 51 / 47°F 49% 1006 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

13 / 22 mph 52 / 47°F 51% 1007 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

WNW
WNW

8 / 13 mph 51 / 48°F 58% 1007 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

6 / 12 mph 49 / 46°F 58% 1008 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 27
Jan
01:00

WNW
WNW

7 / 12 mph 49 / 46°F 61% 1008 mb
Low level cloud: 0%
Mid level cloud: 81%
High level cloud: 100%
Most Significant Cloud Type: medium
84%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

W
W

8 / 14 mph 49 / 46°F 64% 1006 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 76%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
07:00

WNW
WNW

6 / 11 mph 50 / 48°F 70% 1004 mb
Low level cloud: 40%
Mid level cloud: 57%
High level cloud: 84%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WSW
WSW

8 / 14 mph 53 / 49°F 76% 1002 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 100%
Most Significant Cloud Type: medium
48%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
13:00

WSW
WSW

24 / 30 mph 62 / 61°F 71% 1000 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 81%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

SW
SW

28 / 37 mph 62 / 61°F 74% 997 mb
Low level cloud: 4%
Mid level cloud: 44%
High level cloud: 100%
Most Significant Cloud Type: medium
58%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

20 / 27 mph 59 / 59°F 70% 997 mb
Low level cloud: 0%
Mid level cloud: 25%
High level cloud: 22%
Most Significant Cloud Type: medium
25%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

W
W

22 / 37 mph 52 / 45°F 60% 999 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 1%
Most Significant Cloud Type: medium
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 28
Jan
01:00

W
W

26 / 37 mph 50 / 43°F 59% 1000 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
04:00

WNW
WNW

28 / 39 mph 49 / 41°F 54% 1001 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

24 / 35 mph 48 / 40°F 50% 1004 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
10:00

WNW
WNW

20 / 27 mph 49 / 42°F 50% 1006 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

NW
NW

17 / 27 mph 51 / 45°F 45% 1005 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 15%
Most Significant Cloud Type: high
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
16:00

W
W

14 / 20 mph 52 / 47°F 49% 1005 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
19:00

W
W

14 / 19 mph 52 / 47°F 52% 1007 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 8%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
22:00

WNW
WNW

12 / 16 mph 50 / 46°F 57% 1009 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 33%
Most Significant Cloud Type: high
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Thu 29
Jan
01:00

E
E

4 / 6 mph 60 / 60°F 76% 1013 mb
Low level cloud: 0%
Mid level cloud: 53%
High level cloud: 21%
Most Significant Cloud Type: medium
53%
0.0 In
07:00

WSW
WSW

27 / 56 mph 56 / 51°F 72% 1002 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 89%
Most Significant Cloud Type: medium
46%
0.0 In
13:00

W
W

6 / 10 mph 53 / 52°F 84% 1003 mb
Low level cloud: 24%
Mid level cloud: 28%
High level cloud: 16%
Most Significant Cloud Type: low
36%
0.0 In
19:00

W
W

18 / 31 mph 63 / 63°F 67% 1009 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 100%
Most Significant Cloud Type: medium
8%
0.0 In
Fri 30
Jan
01:00

NW
NW

6 / 10 mph 62 / 62°F 83% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 3%
Most Significant Cloud Type: medium
4%
0.0 In
07:00

NNW
NNW

7 / 12 mph 53 / 50°F 63% 1022 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 22%
Most Significant Cloud Type: high
21%
0.0 In
13:00

WSW
WSW

3 / 6 mph 62 / 62°F 66% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 3%
Most Significant Cloud Type: high
2%
0.0 In
19:00

W
W

10 / 17 mph 63 / 63°F 69% 1014 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 12%
Most Significant Cloud Type: high
11%
0.0 In
Sat 31
Jan
01:00

NNE
NNE

7 / 10 mph 55 / 54°F 76% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 60%
Most Significant Cloud Type: high
59%
0.0 In
07:00

WNW
WNW

7 / 11 mph 56 / 55°F 67% 1014 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: medium
10%
0.0 In
13:00

SW
SW

5 / 7 mph 61 / 61°F 56% 1018 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
19:00

WSW
WSW

10 / 17 mph 59 / 59°F 70% 1007 mb
Low level cloud: 25%
Mid level cloud: 44%
High level cloud: 1%
Most Significant Cloud Type: low
40%
0.0 In
Sun 01
Feb
01:00

W
W

7 / 11 mph 57 / 56°F 71% 1015 mb
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 32%
Most Significant Cloud Type: medium
3%
0.0 In
07:00

NW
NW

14 / 23 mph 49 / 44°F 70% 1011 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
13:00

NNW
NNW

3 / 5 mph 56 / 56°F 53% 1018 mb
Low level cloud: 4%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: medium
35%
0.0 In
19:00

WNW
WNW

13 / 21 mph 55 / 52°F 65% 1010 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 20%
Most Significant Cloud Type: medium
8%
0.0 In
Mon 02
Feb
01:00

WNW
WNW

4 / 6 mph 57 / 58°F 74% 1018 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 9%
Most Significant Cloud Type: high
9%
0.0 In
07:00

NW
NW

11 / 19 mph 53 / 49°F 72% 1010 mb
Low level cloud: 0%
Mid level cloud: 21%
High level cloud: 33%
Most Significant Cloud Type: medium
21%
0.0 In
13:00

SSW
SSW

10 / 16 mph 58 / 56°F 78% 1012 mb
Low level cloud: 5%
Mid level cloud: 3%
High level cloud: 33%
Most Significant Cloud Type: low
9%
0.0 In
19:00

W
W

11 / 19 mph 57 / 55°F 58% 1012 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 43%
Most Significant Cloud Type: medium
8%
0.0 In
Tue 03
Feb
01:00

SSE
SSE

8 / 14 mph 51 / 48°F 91% 1005 mb
Low level cloud: 97%
Mid level cloud: 91%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.1 In
07:00

W
W

12 / 20 mph 52 / 48°F 62% 1009 mb
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 63%
Most Significant Cloud Type: medium
46%
0.0 In
13:00

WSW
WSW

15 / 26 mph 54 / 50°F 56% 1006 mb
Low level cloud: 1%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
11%
0.1 In
19:00

W
W

20 / 34 mph 55 / 50°F 74% 1005 mb
Low level cloud: 28%
Mid level cloud: 40%
High level cloud: 43%
Most Significant Cloud Type: low
47%
0.0 In
Wed 04
Feb
01:00

W
W

7 / 13 mph 56 / 54°F 68% 1006 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 1%
Most Significant Cloud Type: medium
10%
0.0 In
07:00

W
W

23 / 44 mph 60 / 60°F 66% 1000 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 7%
Most Significant Cloud Type: medium
18%
0.0 In
13:00

WNW
WNW

13 / 22 mph 52 / 48°F 53% 1006 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 8%
Most Significant Cloud Type: medium
2%
0.0 In
19:00

WSW
WSW

10 / 16 mph 61 / 61°F 75% 1003 mb
Low level cloud: 0%
Mid level cloud: 99%
High level cloud: 6%
Most Significant Cloud Type: medium
99%
0.0 In
Thu 05
Feb
01:00

W
W

11 / 20 mph 51 / 47°F 63% 1005 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 3%
Most Significant Cloud Type: medium
6%
0.0 In
07:00

W
W

20 / 34 mph 57 / 53°F 66% 1000 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 57%
Most Significant Cloud Type: medium
6%
0.0 In
13:00

NNW
NNW

2 / 4 mph 57 / 58°F 49% 1008 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 7%
Most Significant Cloud Type: medium
10%
0.0 In
19:00

WNW
WNW

36 / 61 mph 54 / 46°F 55% 998 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
Fri 06
Feb
01:00

W
W

7 / 12 mph 54 / 52°F 64% 1010 mb
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 37%
Most Significant Cloud Type: medium
100%
0.0 In
07:00

NW
NW

17 / 29 mph 50 / 44°F 56% 1006 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
13:00

WNW
WNW

6 / 10 mph 61 / 61°F 62% 1008 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 100%
Most Significant Cloud Type: medium
6%
0.0 In
19:00

WNW
WNW

18 / 31 mph 53 / 48°F 49% 1013 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In

Other Locations Near to Fira de Barcelona: Montjuic venue

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