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Ashton-in-Makerfield 14 Day Long Range Forecast

14 Day weather providing an extended long range forecast outlook for Ashton-in-Makerfield

St Helens, United Kingdom

Long range weather outlook for Ashton-in-Makerfield includes 14 day forecast summary:

Over the next 14 days the Ashton-in-Makerfield forecast suggests the average daytime maximum temperature will be around 21°C, with a high for the two weeks of 25°C expected on the afternoon of Monday 11th. The mean minimum temperature will be 14°C, dipping to its lowest on the morning of Saturday 2nd at 11°C. Expect the coming 14 days to have mostly dry days although Monday 04th and Thursday 07th are likely to see a significant amount of rain. Predictions are Monday 4th will have the most precipitation with an accumulation of around 9.0mm. On the whole winds are likely to be moderate.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sat 02
Aug
03:00

NW
NW

3 / 6 mph 54 / 54°F 84%
Low level cloud: 14%
Mid level cloud: 19%
High level cloud: 0%
Most Significant Cloud Type: low
20%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

5 / 7 mph 56 / 54°F 83%
Low level cloud: 19%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

9 / 11 mph 64 / 62°F 56%
Low level cloud: 41%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

11 / 12 mph 66 / 65°F 49%
Low level cloud: 6%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

10 / 12 mph 67 / 66°F 47%
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
18:00

WNW
WNW

10 / 11 mph 65 / 64°F 57%
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
21:00

WNW
WNW

5 / 6 mph 62 / 60°F 78%
Low level cloud: 12%
Mid level cloud: 29%
High level cloud: 64%
Most Significant Cloud Type: low
30%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sun 03
Aug
00:00

WSW
WSW

1 / 2 mph 58 / 58°F 81%
Low level cloud: 88%
Mid level cloud: 41%
High level cloud: 70%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

4 / 6 mph 58 / 59°F 76%
Low level cloud: 99%
Mid level cloud: 46%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

4 / 6 mph 60 / 60°F 80%
Low level cloud: 100%
Mid level cloud: 88%
High level cloud: 91%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

11 / 16 mph 66 / 65°F 84%
Low level cloud: 100%
Mid level cloud: 85%
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

WNW
WNW

11 / 15 mph 65 / 65°F 82%
Low level cloud: 68%
Mid level cloud: 6%
High level cloud: 51%
Most Significant Cloud Type: low
76%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

14 / 16 mph 69 / 68°F 54%
Low level cloud: 1%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

11 / 13 mph 67 / 66°F 59%
Low level cloud: 0%
Mid level cloud: 12%
High level cloud: 34%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

3 / 5 mph 63 / 61°F 78%
Low level cloud: 0%
Mid level cloud: 44%
High level cloud: 98%
Most Significant Cloud Type: medium
47%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 04
Aug
00:00

SW
SW

3 / 5 mph 60 / 60°F 76%
Low level cloud: 0%
Mid level cloud: 94%
High level cloud: 100%
Most Significant Cloud Type: medium
97%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

SSE
SSE

6 / 9 mph 58 / 57°F 92%
Low level cloud: 62%
Mid level cloud: 86%
High level cloud: 98%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

S
S

9 / 15 mph 57 / 55°F 93%
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
09:00

SSW
SSW

11 / 19 mph 62 / 62°F 95%
Low level cloud: 99%
Mid level cloud: 99%
High level cloud: 75%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
12:00

WSW
WSW

17 / 28 mph 63 / 63°F 93%
Low level cloud: 100%
Mid level cloud: 97%
High level cloud: 19%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
15:00

W
W

21 / 25 mph 65 / 64°F 71%
Low level cloud: 26%
Mid level cloud: 5%
High level cloud: 4%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

W
W

18 / 25 mph 62 / 61°F 64%
Low level cloud: 16%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

W
W

17 / 25 mph 59 / 55°F 68%
Low level cloud: 10%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
12%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 05
Aug
00:00

W
W

17 / 21 mph 59 / 55°F 70%
Low level cloud: 53%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
60%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

19 / 26 mph 57 / 53°F 74%
Low level cloud: 96%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
98%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

16 / 25 mph 56 / 52°F 70%
Low level cloud: 76%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

15 / 17 mph 60 / 56°F 65%
Low level cloud: 65%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
65%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

18 / 21 mph 64 / 63°F 56%
Low level cloud: 69%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

16 / 19 mph 66 / 64°F 50%
Low level cloud: 50%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
49%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

11 / 12 mph 65 / 64°F 57%
Low level cloud: 23%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
23%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

NW
NW

6 / 6 mph 62 / 62°F 74%
Low level cloud: 1%
Mid level cloud: 9%
High level cloud: 0%
Most Significant Cloud Type: medium
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 06
Aug
00:00

WNW
WNW

5 / 7 mph 58 / 58°F 82%
Low level cloud: 17%
Mid level cloud: 2%
High level cloud: 0%
Most Significant Cloud Type: low
17%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

WNW
WNW

3 / 5 mph 56 / 56°F 87%
Low level cloud: 7%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
9%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

1 / 2 mph 58 / 56°F 86%
Low level cloud: 17%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: low
19%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WSW
WSW

5 / 6 mph 66 / 64°F 63%
Low level cloud: 21%
Mid level cloud: 4%
High level cloud: 17%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

4 / 5 mph 71 / 69°F 43%
Low level cloud: 0%
Mid level cloud: 2%
High level cloud: 100%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

NW
NW

4 / 5 mph 74 / 75°F 40%
Low level cloud: 0%
Mid level cloud: 34%
High level cloud: 100%
Most Significant Cloud Type: medium
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

NNW
NNW

6 / 7 mph 66 / 64°F 62%
Low level cloud: 11%
Mid level cloud: 43%
High level cloud: 100%
Most Significant Cloud Type: medium
77%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

E
E

4 / 6 mph 63 / 64°F 63%
Low level cloud: 0%
Mid level cloud: 96%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Thu 07
Aug
00:00

SSW
SSW

2 / 4 mph 61 / 61°F 80%
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

S
S

6 / 10 mph 59 / 58°F 87%
Low level cloud: 0%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: medium
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

SSW
SSW

8 / 13 mph 58 / 57°F 81%
Low level cloud: 96%
Mid level cloud: 43%
High level cloud: 92%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

W
W

13 / 19 mph 63 / 62°F 86%
Low level cloud: 71%
Mid level cloud: 24%
High level cloud: 70%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

W
W

15 / 17 mph 67 / 66°F 57%
Low level cloud: 13%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
13%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

W
W

14 / 16 mph 69 / 68°F 54%
Low level cloud: 33%
Mid level cloud: 4%
High level cloud: 32%
Most Significant Cloud Type: low
38%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
18:00

WNW
WNW

11 / 13 mph 66 / 65°F 63%
Low level cloud: 52%
Mid level cloud: 16%
High level cloud: 80%
Most Significant Cloud Type: low
67%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

8 / 10 mph 61 / 61°F 71%
Low level cloud: 46%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: low
46%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 08
Aug
00:00

W
W

5 / 7 mph 59 / 58°F 74%
Low level cloud: 24%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
24%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
03:00

W
W

3 / 5 mph 56 / 57°F 78%
Low level cloud: 31%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
31%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
06:00

WNW
WNW

3 / 4 mph 57 / 56°F 80%
Low level cloud: 68%
Mid level cloud: 0%
High level cloud: 4%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
09:00

WNW
WNW

9 / 11 mph 63 / 62°F 56%
Low level cloud: 41%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
41%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
12:00

WNW
WNW

11 / 12 mph 65 / 64°F 47%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 6%
Most Significant Cloud Type: high
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
15:00

WNW
WNW

11 / 13 mph 66 / 64°F 45%
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
18:00

WNW
WNW

8 / 9 mph 65 / 64°F 49%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 16%
Most Significant Cloud Type: high
16%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
21:00

WNW
WNW

1 / 2 mph 59 / 59°F 64%
Low level cloud: 27%
Mid level cloud: 5%
High level cloud: 6%
Most Significant Cloud Type: low
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityCloud AmountPrecip AmountWeather
Sat 09
Aug
00:00

NE
NE

2 / 3 mph 66 / 66°F 80%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 14%
Most Significant Cloud Type: high
13%
0.0 In
06:00

SSW
SSW

7 / 12 mph 62 / 62°F 75%
Low level cloud: 0%
Mid level cloud: 24%
High level cloud: 15%
Most Significant Cloud Type: medium
24%
0.0 In
12:00

W
W

11 / 19 mph 71 / 71°F 44%
Low level cloud: 0%
Mid level cloud: 14%
High level cloud: 14%
Most Significant Cloud Type: medium
14%
0.0 In
18:00

NNW
NNW

6 / 9 mph 76 / 78°F 42%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 8%
Most Significant Cloud Type: high
8%
0.0 In
Sun 10
Aug
00:00

WSW
WSW

4 / 8 mph 68 / 68°F 74%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
06:00

W
W

6 / 11 mph 63 / 64°F 86%
Low level cloud: 18%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: low
20%
0.0 In
12:00

WNW
WNW

8 / 14 mph 74 / 76°F 45%
Low level cloud: 4%
Mid level cloud: 1%
High level cloud: 34%
Most Significant Cloud Type: medium
13%
0.0 In
18:00

WNW
WNW

9 / 14 mph 70 / 70°F 55%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 32%
Most Significant Cloud Type: medium
4%
0.0 In
Mon 11
Aug
00:00

NW
NW

2 / 3 mph 66 / 66°F 86%
Low level cloud: 73%
Mid level cloud: 44%
High level cloud: 10%
Most Significant Cloud Type: low
89%
0.0 In
06:00

SSE
SSE

4 / 6 mph 63 / 63°F 67%
Low level cloud: 29%
Mid level cloud: 13%
High level cloud: 0%
Most Significant Cloud Type: low
33%
0.0 In
12:00

WNW
WNW

7 / 13 mph 77 / 79°F 55%
Low level cloud: 45%
Mid level cloud: 13%
High level cloud: 2%
Most Significant Cloud Type: low
50%
0.0 In
18:00

WNW
WNW

11 / 17 mph 73 / 76°F 53%
Low level cloud: 2%
Mid level cloud: 46%
High level cloud: 0%
Most Significant Cloud Type: medium
52%
0.0 In
Tue 12
Aug
00:00

NW
NW

2 / 4 mph 73 / 77°F 89%
Low level cloud: 11%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
13%
0.0 In
06:00

NW
NW

7 / 11 mph 63 / 63°F 89%
Low level cloud: 96%
Mid level cloud: 20%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.0 In
12:00

NW
NW

4 / 6 mph 84 / 85°F 43%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 6%
Most Significant Cloud Type: medium
4%
0.0 In
18:00

NW
NW

9 / 14 mph 70 / 70°F 56%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
Wed 13
Aug
00:00

ESE
ESE

4 / 8 mph 75 / 78°F 74%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
06:00

ESE
ESE

3 / 5 mph 64 / 64°F 75%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 100%
Most Significant Cloud Type: medium
7%
0.0 In
12:00

ENE
ENE

4 / 7 mph 79 / 80°F 48%
Low level cloud: 5%
Mid level cloud: 15%
High level cloud: 97%
Most Significant Cloud Type: medium
32%
0.0 In
18:00

ENE
ENE

5 / 8 mph 83 / 81°F 32%
Low level cloud: 0%
Mid level cloud: 9%
High level cloud: 14%
Most Significant Cloud Type: medium
9%
0.0 In
Thu 14
Aug
00:00

SSE
SSE

4 / 7 mph 73 / 77°F 62%
Low level cloud: 0%
Mid level cloud: 27%
High level cloud: 36%
Most Significant Cloud Type: medium
28%
0.0 In
06:00

SE
SE

5 / 9 mph 63 / 63°F 69%
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 5%
Most Significant Cloud Type: medium
5%
0.0 In
12:00

S
S

2 / 4 mph 87 / 87°F 37%
Low level cloud: 0%
Mid level cloud: 22%
High level cloud: 12%
Most Significant Cloud Type: medium
22%
0.0 In
18:00

E
E

6 / 11 mph 81 / 79°F 27%
Low level cloud: 0%
Mid level cloud: 30%
High level cloud: 0%
Most Significant Cloud Type: medium
29%
0.0 In
Fri 15
Aug
00:00

WNW
WNW

2 / 4 mph 76 / 79°F 73%
Low level cloud: 0%
Mid level cloud: 3%
High level cloud: 3%
Most Significant Cloud Type: medium
2%
0.0 In
06:00

ESE
ESE

4 / 7 mph 64 / 64°F 68%
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
0.0 In
12:00

WNW
WNW

13 / 22 mph 72 / 76°F 52%
Low level cloud: 12%
Mid level cloud: 7%
High level cloud: 100%
Most Significant Cloud Type: low
26%
0.0 In
18:00

E
E

9 / 14 mph 85 / 82°F 25%
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 3%
Most Significant Cloud Type: medium
5%
0.0 In
Sat 16
Aug
00:00

ENE
ENE

5 / 9 mph 62 / 62°F 81%
Low level cloud: 70%
Mid level cloud: 0%
High level cloud: 1%
Most Significant Cloud Type: low
70%
0.0 In
06:00

ESE
ESE

5 / 9 mph 64 / 64°F 59%
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 93%
Most Significant Cloud Type: high
92%
0.0 In
12:00

SE
SE

2 / 4 mph 79 / 78°F 38%
Low level cloud: 3%
Mid level cloud: 6%
High level cloud: 16%
Most Significant Cloud Type: low
6%
0.0 In
18:00

SSW
SSW

4 / 7 mph 91 / 92°F 36%
Low level cloud: 0%
Mid level cloud: 32%
High level cloud: 6%
Most Significant Cloud Type: medium
31%
0.0 In
Sun 17
Aug
00:00

SSE
SSE

8 / 14 mph 65 / 65°F 55%
Low level cloud: 0%
Mid level cloud: 23%
High level cloud: 30%
Most Significant Cloud Type: medium
24%
0.0 In
06:00

NW
NW

5 / 11 mph 67 / 67°F 92%
Low level cloud: 18%
Mid level cloud: 9%
High level cloud: 100%
Most Significant Cloud Type: low
33%
0.1 In
12:00

S
S

5 / 9 mph 80 / 80°F 36%
Low level cloud: 2%
Mid level cloud: 6%
High level cloud: 1%
Most Significant Cloud Type: low
4%
0.0 In
18:00

NE
NE

7 / 15 mph 74 / 77°F 64%
Low level cloud: 49%
Mid level cloud: 10%
High level cloud: 13%
Most Significant Cloud Type: low
54%
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