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Grand Union Canal 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Grand Union Canal

Berkshire, United Kingdom

Long range weather outlook for Grand Union Canal includes 14 day forecast summary:

For Grand Union Canal in the coming two weeks the average daytime maximum temperature will be around 18°C, with a high for the two weeks of 21°C expected on the evening of Sunday 2nd. The mean minimum temperature will be 9°C, dipping to its lowest on the morning of Sunday 2nd at 6°C. The next 14 days will remain predominantly dry. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 02
Jun
12:00

N
N

10 / 11 mph 69 / 67°F 63% 1027 mb
Low level cloud: 55%
Mid level cloud: 0%
High level cloud: 18%
Most Significant Cloud Type: low
56%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NNW
NNW

11 / 13 mph 69 / 68°F 60% 1026 mb
Low level cloud: 11%
Mid level cloud: 0%
High level cloud: 9%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

8 / 9 mph 70 / 68°F 67% 1025 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
21:00

NNW
NNW

6 / 6 mph 64 / 61°F 90% 1026 mb
Low level cloud: 2%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
2%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 03
Jun
00:00

NW
NW

7 / 12 mph 53 / 51°F 93% 1025 mb
Low level cloud: 26%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
27%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

NW
NW

5 / 10 mph 50 / 48°F 94% 1024 mb
Low level cloud: 70%
Mid level cloud: 21%
High level cloud: 95%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

NW
NW

8 / 11 mph 56 / 52°F 89% 1023 mb
Low level cloud: 37%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

NNW
NNW

11 / 13 mph 60 / 60°F 80% 1022 mb
Low level cloud: 99%
Mid level cloud: 21%
High level cloud: 75%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

NNW
NNW

9 / 10 mph 63 / 62°F 76% 1022 mb
Low level cloud: 96%
Mid level cloud: 65%
High level cloud: 40%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

8 / 9 mph 65 / 65°F 72% 1020 mb
Low level cloud: 81%
Mid level cloud: 50%
High level cloud: 46%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

5 / 6 mph 67 / 64°F 80% 1019 mb
Low level cloud: 33%
Mid level cloud: 44%
High level cloud: 99%
Most Significant Cloud Type: low
59%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NNW
NNW

4 / 7 mph 58 / 57°F 90% 1019 mb
Low level cloud: 15%
Mid level cloud: 48%
High level cloud: 14%
Most Significant Cloud Type: medium
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 04
Jun
00:00

W
W

2 / 3 mph 54 / 54°F 91% 1018 mb
Low level cloud: 91%
Mid level cloud: 28%
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

SSW
SSW

4 / 6 mph 55 / 55°F 91% 1015 mb
Low level cloud: 96%
Mid level cloud: 21%
High level cloud: 20%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

8 / 11 mph 58 / 55°F 91% 1014 mb
Low level cloud: 49%
Mid level cloud: 55%
High level cloud: 33%
Most Significant Cloud Type: low
72%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

12 / 14 mph 64 / 63°F 73% 1012 mb
Low level cloud: 66%
Mid level cloud: 49%
High level cloud: 21%
Most Significant Cloud Type: low
85%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WSW
WSW

15 / 17 mph 68 / 66°F 65% 1010 mb
Low level cloud: 45%
Mid level cloud: 44%
High level cloud: 6%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

17 / 20 mph 68 / 67°F 63% 1009 mb
Low level cloud: 11%
Mid level cloud: 9%
High level cloud: 9%
Most Significant Cloud Type: low
15%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

14 / 19 mph 57 / 54°F 76% 1010 mb
Low level cloud: 16%
Mid level cloud: 83%
High level cloud: 14%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

8 / 12 mph 55 / 51°F 92% 1011 mb
Low level cloud: 31%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
32%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 05
Jun
00:00

NW
NW

4 / 6 mph 50 / 49°F 93% 1012 mb
Low level cloud: 48%
Mid level cloud: 10%
High level cloud: 8%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

4 / 6 mph 48 / 47°F 90% 1013 mb
Low level cloud: 1%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

4 / 6 mph 50 / 48°F 77% 1015 mb
Low level cloud: 9%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
11%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

9 / 10 mph 57 / 54°F 53% 1015 mb
Low level cloud: 12%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

9 / 11 mph 59 / 57°F 49% 1016 mb
Low level cloud: 18%
Mid level cloud: 68%
High level cloud: 2%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

7 / 8 mph 59 / 58°F 54% 1017 mb
Low level cloud: 14%
Mid level cloud: 74%
High level cloud: 19%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

6 / 6 mph 60 / 58°F 62% 1017 mb
Low level cloud: 0%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: medium
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

6 / 11 mph 53 / 48°F 79% 1018 mb
Low level cloud: 2%
Mid level cloud: 45%
High level cloud: 11%
Most Significant Cloud Type: medium
50%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 06
Jun
00:00

NW
NW

5 / 9 mph 47 / 45°F 80% 1018 mb
Low level cloud: 11%
Mid level cloud: 18%
High level cloud: 90%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

4 / 8 mph 45 / 43°F 82% 1018 mb
Low level cloud: 15%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

4 / 5 mph 49 / 47°F 75% 1019 mb
Low level cloud: 6%
Mid level cloud: 4%
High level cloud: 8%
Most Significant Cloud Type: low
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

6 / 7 mph 58 / 55°F 59% 1019 mb
Low level cloud: 1%
Mid level cloud: 2%
High level cloud: 91%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

7 / 8 mph 61 / 60°F 53% 1018 mb
Low level cloud: 70%
Mid level cloud: 43%
High level cloud: 32%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WSW
WSW

8 / 10 mph 61 / 60°F 59% 1017 mb
Low level cloud: 72%
Mid level cloud: 46%
High level cloud: 43%
Most Significant Cloud Type: low
93%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WSW
WSW

8 / 9 mph 62 / 60°F 67% 1016 mb
Low level cloud: 16%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

7 / 10 mph 55 / 51°F 85% 1017 mb
Low level cloud: 45%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: low
61%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 07
Jun
00:00

WSW
WSW

6 / 11 mph 47 / 44°F 90% 1016 mb
Low level cloud: 5%
Mid level cloud: 31%
High level cloud: 4%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SW
SW

8 / 15 mph 46 / 42°F 89% 1015 mb
Low level cloud: 1%
Mid level cloud: 40%
High level cloud: 18%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SW
SW

11 / 17 mph 50 / 45°F 83% 1014 mb
Low level cloud: 98%
Mid level cloud: 32%
High level cloud: 3%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

15 / 17 mph 59 / 55°F 68% 1014 mb
Low level cloud: 73%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
74%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

14 / 16 mph 64 / 62°F 53% 1015 mb
Low level cloud: 40%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

16 / 18 mph 64 / 63°F 54% 1014 mb
Low level cloud: 34%
Mid level cloud: 32%
High level cloud: 0%
Most Significant Cloud Type: low
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

14 / 18 mph 60 / 56°F 67% 1015 mb
Low level cloud: 45%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WSW
WSW

10 / 14 mph 54 / 50°F 80% 1016 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 11%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 08
Jun
00:00

WSW
WSW

9 / 15 mph 48 / 44°F 89% 1017 mb
Low level cloud: 9%
Mid level cloud: 6%
High level cloud: 100%
Most Significant Cloud Type: medium
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

8 / 15 mph 46 / 42°F 92% 1017 mb
Low level cloud: 15%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

9 / 13 mph 51 / 46°F 84% 1018 mb
Low level cloud: 11%
Mid level cloud: 12%
High level cloud: 37%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

11 / 12 mph 57 / 54°F 65% 1019 mb
Low level cloud: 67%
Mid level cloud: 5%
High level cloud: 19%
Most Significant Cloud Type: low
70%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

11 / 12 mph 62 / 61°F 54% 1019 mb
Low level cloud: 87%
Mid level cloud: 6%
High level cloud: 19%
Most Significant Cloud Type: low
90%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

12 / 14 mph 61 / 61°F 59% 1019 mb
Low level cloud: 93%
Mid level cloud: 8%
High level cloud: 14%
Most Significant Cloud Type: low
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

7 / 8 mph 62 / 59°F 71% 1019 mb
Low level cloud: 14%
Mid level cloud: 24%
High level cloud: 0%
Most Significant Cloud Type: low
22%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

5 / 9 mph 56 / 53°F 82% 1020 mb
Low level cloud: 1%
Mid level cloud: 19%
High level cloud: 21%
Most Significant Cloud Type: medium
21%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 09
Jun
00:00

NE
NE

7 / 13 mph 55 / 53°F 91% 1018 mb
Low level cloud: 15%
Mid level cloud: 46%
High level cloud: 1%
Most Significant Cloud Type: medium
87%
0.0 In
06:00

ENE
ENE

7 / 13 mph 57 / 56°F 84% 1021 mb
Low level cloud: 10%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
12:00

E
E

10 / 16 mph 72 / 76°F 52% 1023 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
18:00

NW
NW

6 / 12 mph 71 / 71°F 61% 1015 mb
Low level cloud: 11%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
14%
0.0 In
Mon 10
Jun
00:00

NNE
NNE

6 / 9 mph 54 / 52°F 89% 1017 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 0%
Most Significant Cloud Type: medium
1%
0.0 In
06:00

NW
NW

9 / 18 mph 50 / 46°F 83% 1008 mb
Low level cloud: 12%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
12:00

WNW
WNW

10 / 15 mph 65 / 65°F 56% 1019 mb
Low level cloud: 86%
Mid level cloud: 39%
High level cloud: 0%
Most Significant Cloud Type: low
99%
0.0 In
18:00

NNW
NNW

11 / 19 mph 65 / 65°F 65% 1017 mb
Low level cloud: 0%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: medium
10%
0.0 In
Tue 11
Jun
00:00

NE
NE

5 / 9 mph 56 / 55°F 88% 1024 mb
Low level cloud: 19%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In
06:00

NNW
NNW

6 / 10 mph 52 / 50°F 83% 1021 mb
Low level cloud: 7%
Mid level cloud: 53%
High level cloud: 8%
Most Significant Cloud Type: medium
71%
0.0 In
12:00

NNW
NNW

3 / 5 mph 72 / 76°F 51% 1026 mb
Low level cloud: 8%
Mid level cloud: 3%
High level cloud: 11%
Most Significant Cloud Type: low
10%
0.0 In
18:00

NW
NW

4 / 6 mph 70 / 70°F 62% 1021 mb
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 86%
Most Significant Cloud Type: medium
15%
0.0 In
Wed 12
Jun
00:00

SSW
SSW

4 / 8 mph 61 / 61°F 88% 1026 mb
Low level cloud: 0%
Mid level cloud: 1%
High level cloud: 100%
Most Significant Cloud Type: medium
5%
0.0 In
06:00

WSW
WSW

6 / 11 mph 55 / 54°F 85% 1019 mb
Low level cloud: 9%
Mid level cloud: 86%
High level cloud: 80%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

ESE
ESE

3 / 6 mph 71 / 71°F 47% 1024 mb
Low level cloud: 1%
Mid level cloud: 0%
High level cloud: 100%
Most Significant Cloud Type: high
99%
0.0 In
18:00

WNW
WNW

11 / 20 mph 66 / 66°F 69% 1014 mb
Low level cloud: 12%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
18%
0.0 In
Thu 13
Jun
00:00

ESE
ESE

3 / 6 mph 58 / 58°F 75% 1022 mb
Low level cloud: 0%
Mid level cloud: 91%
High level cloud: 78%
Most Significant Cloud Type: medium
93%
0.0 In
06:00

WSW
WSW

5 / 9 mph 57 / 56°F 88% 1014 mb
Low level cloud: 46%
Mid level cloud: 20%
High level cloud: 33%
Most Significant Cloud Type: low
57%
0.0 In
12:00

E
E

4 / 6 mph 76 / 78°F 44% 1017 mb
Low level cloud: 0%
Mid level cloud: 19%
High level cloud: 90%
Most Significant Cloud Type: medium
22%
0.0 In
18:00

W
W

10 / 20 mph 59 / 57°F 78% 1013 mb
Low level cloud: 55%
Mid level cloud: 45%
High level cloud: 13%
Most Significant Cloud Type: low
72%
0.0 In
Fri 14
Jun
00:00

E
E

5 / 8 mph 62 / 62°F 79% 1016 mb
Low level cloud: 0%
Mid level cloud: 45%
High level cloud: 95%
Most Significant Cloud Type: medium
49%
0.0 In
06:00

WSW
WSW

5 / 9 mph 56 / 56°F 83% 1014 mb
Low level cloud: 14%
Mid level cloud: 30%
High level cloud: 33%
Most Significant Cloud Type: low
29%
0.0 In
12:00

NNE
NNE

6 / 9 mph 78 / 79°F 51% 1015 mb
Low level cloud: 16%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
18:00

SW
SW

12 / 24 mph 62 / 62°F 88% 1011 mb
Low level cloud: 55%
Mid level cloud: 46%
High level cloud: 5%
Most Significant Cloud Type: low
71%
0.1 In
Sat 15
Jun
00:00

ENE
ENE

6 / 9 mph 64 / 64°F 74% 1016 mb
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

WSW
WSW

12 / 25 mph 54 / 51°F 90% 1008 mb
Low level cloud: 43%
Mid level cloud: 44%
High level cloud: 69%
Most Significant Cloud Type: low
67%
0.0 In
12:00

E
E

9 / 16 mph 77 / 78°F 49% 1014 mb
Low level cloud: 19%
Mid level cloud: 31%
High level cloud: 14%
Most Significant Cloud Type: low
31%
0.0 In
18:00

N
N

13 / 27 mph 59 / 59°F 83% 1010 mb
Low level cloud: 91%
Mid level cloud: 31%
High level cloud: 4%
Most Significant Cloud Type: low
100%
0.1 In
Sun 16
Jun
00:00

ENE
ENE

8 / 14 mph 63 / 63°F 77% 1013 mb
Low level cloud: 4%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: medium
25%
0.0 In
06:00

ENE
ENE

3 / 6 mph 54 / 54°F 75% 1015 mb
Low level cloud: 57%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: low
71%
0.0 In
12:00

ESE
ESE

12 / 23 mph 72 / 76°F 75% 1006 mb
Low level cloud: 66%
Mid level cloud: 60%
High level cloud: 45%
Most Significant Cloud Type: low
92%
0.1 In
18:00

SSW
SSW

7 / 14 mph 68 / 68°F 66% 1015 mb
Low level cloud: 13%
Mid level cloud: 15%
High level cloud: 19%
Most Significant Cloud Type: low
20%
0.0 In
Mon 17
Jun
00:00

WSW
WSW

6 / 12 mph 62 / 62°F 96% 1006 mb
Low level cloud: 37%
Mid level cloud: 88%
High level cloud: 0%
Most Significant Cloud Type: low
68%
0.3 In
06:00

S
S

3 / 7 mph 57 / 58°F 83% 1015 mb
Low level cloud: 8%
Mid level cloud: 91%
High level cloud: 1%
Most Significant Cloud Type: medium
100%
0.0 In
12:00

S
S

9 / 19 mph 69 / 69°F 66% 1005 mb
Low level cloud: 84%
Mid level cloud: 61%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
18:00

SSW
SSW

6 / 13 mph 60 / 60°F 80% 1014 mb
Low level cloud: 45%
Mid level cloud: 88%
High level cloud: 35%
Most Significant Cloud Type: low
79%
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