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Katerini 14 Day Long Range Forecast

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

Greece

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

The outlook for Katerini in the two weeks ahead shows the average daytime maximum temperature will be around 10°C, with a high for the two weeks of 14°C expected on the afternoon of Monday 3rd. The average minimum temperature will be 5°C, dipping to its lowest on the morning of Thursday 6th at 2°C. The fortnight ahead will have some days seeing a little precipitation and some days with rain. It looks like Tuesday 4th will have the most precipitation with an accumulation of around 4.0mm. On the whole winds are likely to be light.

DayLocal TimeDirSpeed/
Gust
Temp/
Feels Like
HumidityPressureCloud AmountPrecip AmountWeather
Sun 02
Feb
17:00

SSE
SSE

6 / 7 mph 56 / 54°F 87% 1023 mb
Low level cloud: 79%
Mid level cloud: 20%
High level cloud: 22%
Most Significant Cloud Type: low
88%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SSE
SSE

4 / 5 mph 53 / 53°F 92% 1023 mb
Low level cloud: 62%
Mid level cloud: 11%
High level cloud: 33%
Most Significant Cloud Type: low
69%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SSE
SSE

2 / 4 mph 52 / 52°F 87% 1023 mb
Low level cloud: 80%
Mid level cloud: 24%
High level cloud: 9%
Most Significant Cloud Type: low
89%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Mon 03
Feb
02:00

S
S

1 / 2 mph 49 / 49°F 88% 1022 mb
Low level cloud: 60%
Mid level cloud: 21%
High level cloud: 6%
Most Significant Cloud Type: low
68%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

NW
NW

1 / 2 mph 48 / 48°F 89% 1021 mb
Low level cloud: 49%
Mid level cloud: 11%
High level cloud: 1%
Most Significant Cloud Type: low
52%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NNW
NNW

2 / 3 mph 47 / 46°F 88% 1021 mb
Low level cloud: 40%
Mid level cloud: 9%
High level cloud: 2%
Most Significant Cloud Type: low
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NE
NE

5 / 6 mph 55 / 54°F 75% 1021 mb
Low level cloud: 45%
Mid level cloud: 15%
High level cloud: 10%
Most Significant Cloud Type: low
51%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ENE
ENE

4 / 5 mph 58 / 57°F 68% 1019 mb
Low level cloud: 44%
Mid level cloud: 27%
High level cloud: 82%
Most Significant Cloud Type: low
63%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SE
SE

3 / 3 mph 57 / 57°F 75% 1019 mb
Low level cloud: 2%
Mid level cloud: 23%
High level cloud: 19%
Most Significant Cloud Type: medium
29%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

WSW
WSW

5 / 10 mph 50 / 48°F 83% 1019 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 17%
Most Significant Cloud Type: medium
44%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

N
N

1 / 3 mph 49 / 49°F 77% 1020 mb
Low level cloud: 17%
Mid level cloud: 49%
High level cloud: 13%
Most Significant Cloud Type: medium
96%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Tue 04
Feb
02:00

N
N

5 / 7 mph 48 / 46°F 72% 1022 mb
Low level cloud: 95%
Mid level cloud: 86%
High level cloud: 15%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

NNE
NNE

1 / 1 mph 46 / 46°F 78% 1023 mb
Low level cloud: 100%
Mid level cloud: 94%
High level cloud: 14%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NW
NW

5 / 6 mph 44 / 41°F 88% 1025 mb
Low level cloud: 93%
Mid level cloud: 62%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.1 In of precipitation over the past 3 hours.
0.1 In
11:00

NNW
NNW

9 / 10 mph 42 / 37°F 85% 1026 mb
Low level cloud: 95%
Mid level cloud: 77%
High level cloud: 49%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NW
NW

6 / 7 mph 44 / 40°F 80% 1025 mb
Low level cloud: 89%
Mid level cloud: 73%
High level cloud: 6%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

NNW
NNW

1 / 1 mph 46 / 46°F 73% 1025 mb
Low level cloud: 61%
Mid level cloud: 50%
High level cloud: 0%
Most Significant Cloud Type: low
78%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

WSW
WSW

4 / 7 mph 43 / 40°F 80% 1026 mb
Low level cloud: 0%
Mid level cloud: 43%
High level cloud: 0%
Most Significant Cloud Type: medium
43%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WSW
WSW

5 / 9 mph 41 / 38°F 76% 1027 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Wed 05
Feb
02:00

W
W

4 / 9 mph 38 / 35°F 70% 1028 mb
Low level cloud: 32%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: low
33%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WNW
WNW

4 / 7 mph 37 / 35°F 71% 1029 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
08:00

W
W

2 / 4 mph 37 / 35°F 68% 1030 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
11:00

NE
NE

4 / 4 mph 45 / 43°F 51% 1031 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
14:00

NE
NE

5 / 6 mph 49 / 47°F 41% 1029 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
17:00

ENE
ENE

3 / 4 mph 49 / 48°F 51% 1028 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
20:00

WSW
WSW

6 / 11 mph 42 / 38°F 57% 1030 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WSW
WSW

5 / 10 mph 39 / 35°F 53% 1031 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
Thu 06
Feb
02:00

W
W

4 / 9 mph 39 / 36°F 58% 1031 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

W
W

5 / 10 mph 37 / 33°F 60% 1032 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

W
W

4 / 9 mph 37 / 33°F 62% 1033 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
11:00

NNE
NNE

5 / 6 mph 47 / 44°F 51% 1033 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
6%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NE
NE

6 / 7 mph 50 / 47°F 47% 1031 mb
Low level cloud: 0%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: medium
5%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

E
E

4 / 5 mph 50 / 48°F 64% 1029 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 0%
Most Significant Cloud Type: medium
4%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SSW
SSW

3 / 4 mph 44 / 42°F 75% 1030 mb
Low level cloud: 0%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

WSW
WSW

3 / 6 mph 40 / 38°F 79% 1030 mb
Low level cloud: 24%
Mid level cloud: 12%
High level cloud: 0%
Most Significant Cloud Type: low
28%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Fri 07
Feb
02:00

W
W

3 / 5 mph 40 / 39°F 80% 1029 mb
Low level cloud: 74%
Mid level cloud: 16%
High level cloud: 0%
Most Significant Cloud Type: low
79%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

WNW
WNW

3 / 6 mph 40 / 38°F 78% 1027 mb
Low level cloud: 71%
Mid level cloud: 27%
High level cloud: 0%
Most Significant Cloud Type: low
80%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

NW
NW

4 / 6 mph 41 / 38°F 78% 1027 mb
Low level cloud: 94%
Mid level cloud: 31%
High level cloud: 2%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

NNE
NNE

4 / 5 mph 44 / 42°F 80% 1027 mb
Low level cloud: 97%
Mid level cloud: 46%
High level cloud: 13%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

NE
NE

4 / 4 mph 46 / 45°F 78% 1026 mb
Low level cloud: 91%
Mid level cloud: 44%
High level cloud: 50%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SE
SE

4 / 6 mph 46 / 44°F 80% 1025 mb
Low level cloud: 95%
Mid level cloud: 98%
High level cloud: 4%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SE
SE

5 / 7 mph 44 / 42°F 84% 1025 mb
Low level cloud: 96%
Mid level cloud: 97%
High level cloud: 33%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SE
SE

4 / 8 mph 43 / 40°F 83% 1026 mb
Low level cloud: 97%
Mid level cloud: 61%
High level cloud: 32%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
Sat 08
Feb
02:00

SE
SE

5 / 7 mph 45 / 42°F 82% 1025 mb
Low level cloud: 99%
Mid level cloud: 65%
High level cloud: 91%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
05:00

SE
SE

5 / 8 mph 45 / 42°F 83% 1025 mb
Low level cloud: 96%
Mid level cloud: 90%
High level cloud: 76%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
08:00

ESE
ESE

3 / 4 mph 45 / 45°F 81% 1026 mb
Low level cloud: 98%
Mid level cloud: 46%
High level cloud: 50%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
11:00

ESE
ESE

6 / 7 mph 47 / 44°F 76% 1027 mb
Low level cloud: 94%
Mid level cloud: 71%
High level cloud: 8%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
14:00

ESE
ESE

7 / 8 mph 48 / 45°F 75% 1026 mb
Low level cloud: 99%
Mid level cloud: 12%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
17:00

SE
SE

4 / 4 mph 48 / 47°F 80% 1026 mb
Low level cloud: 88%
Mid level cloud: 24%
High level cloud: 100%
Most Significant Cloud Type: low
100%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
20:00

SSE
SSE

3 / 4 mph 48 / 47°F 81% 1027 mb
Low level cloud: 81%
Mid level cloud: 19%
High level cloud: 100%
Most Significant Cloud Type: low
99%
Expect 0.0 In of precipitation over the past 3 hours.
0.0 In
23:00

SSE
SSE

1 / 2 mph 47 / 47°F 79% 1027 mb
Low level cloud: 92%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
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
Feb
02:00

W
W

4 / 6 mph 41 / 38°F 71% 1033 mb
Low level cloud: 0%
Mid level cloud: 5%
High level cloud: 33%
Most Significant Cloud Type: medium
6%
0.0 In
08:00

W
W

4 / 7 mph 37 / 34°F 69% 1031 mb
Low level cloud: 21%
Mid level cloud: 6%
High level cloud: 56%
Most Significant Cloud Type: low
29%
0.0 In
14:00

E
E

6 / 9 mph 50 / 47°F 62% 1032 mb
Low level cloud: 39%
Mid level cloud: 3%
High level cloud: 0%
Most Significant Cloud Type: low
40%
0.0 In
20:00

SSW
SSW

2 / 3 mph 45 / 45°F 78% 1028 mb
Low level cloud: 44%
Mid level cloud: 10%
High level cloud: 12%
Most Significant Cloud Type: low
49%
0.0 In
Mon 10
Feb
02:00

W
W

1 / 1 mph 43 / 43°F 89% 1027 mb
Low level cloud: 89%
Mid level cloud: 53%
High level cloud: 14%
Most Significant Cloud Type: low
100%
0.0 In
08:00

W
W

4 / 8 mph 39 / 36°F 76% 1024 mb
Low level cloud: 2%
Mid level cloud: 74%
High level cloud: 32%
Most Significant Cloud Type: medium
81%
0.0 In
14:00

ENE
ENE

6 / 9 mph 55 / 54°F 52% 1025 mb
Low level cloud: 5%
Mid level cloud: 10%
High level cloud: 4%
Most Significant Cloud Type: low
8%
0.0 In
20:00

SSW
SSW

3 / 5 mph 54 / 55°F 84% 1025 mb
Low level cloud: 9%
Mid level cloud: 8%
High level cloud: 0%
Most Significant Cloud Type: low
12%
0.0 In
Tue 11
Feb
02:00

SW
SW

5 / 8 mph 42 / 39°F 70% 1030 mb
Low level cloud: 62%
Mid level cloud: 6%
High level cloud: 0%
Most Significant Cloud Type: low
64%
0.0 In
08:00

WSW
WSW

3 / 6 mph 46 / 45°F 77% 1027 mb
Low level cloud: 28%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
27%
0.0 In
14:00

ESE
ESE

9 / 13 mph 49 / 45°F 61% 1030 mb
Low level cloud: 49%
Mid level cloud: 6%
High level cloud: 7%
Most Significant Cloud Type: low
51%
0.0 In
20:00

SSE
SSE

3 / 5 mph 54 / 54°F 75% 1027 mb
Low level cloud: 17%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: low
17%
0.0 In
Wed 12
Feb
02:00

SSW
SSW

2 / 4 mph 42 / 41°F 66% 1030 mb
Low level cloud: 83%
Mid level cloud: 15%
High level cloud: 32%
Most Significant Cloud Type: low
91%
0.0 In
08:00

W
W

3 / 5 mph 45 / 44°F 76% 1028 mb
Low level cloud: 64%
Mid level cloud: 0%
High level cloud: 84%
Most Significant Cloud Type: low
73%
0.0 In
14:00

SE
SE

12 / 19 mph 43 / 37°F 82% 1031 mb
Low level cloud: 94%
Mid level cloud: 74%
High level cloud: 10%
Most Significant Cloud Type: low
100%
0.0 In
20:00

SE
SE

4 / 7 mph 48 / 46°F 77% 1027 mb
Low level cloud: 94%
Mid level cloud: 20%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Thu 13
Feb
02:00

SE
SE

8 / 13 mph 41 / 36°F 87% 1031 mb
Low level cloud: 92%
Mid level cloud: 49%
High level cloud: 94%
Most Significant Cloud Type: low
100%
0.0 In
08:00

NNW
NNW

3 / 5 mph 46 / 45°F 83% 1025 mb
Low level cloud: 87%
Mid level cloud: 9%
High level cloud: 5%
Most Significant Cloud Type: low
91%
0.0 In
14:00

ESE
ESE

7 / 12 mph 43 / 38°F 88% 1029 mb
Low level cloud: 100%
Mid level cloud: 58%
High level cloud: 91%
Most Significant Cloud Type: low
100%
0.1 In
20:00

SW
SW

1 / 2 mph 49 / 49°F 84% 1019 mb
Low level cloud: 100%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
Fri 14
Feb
02:00

SSW
SSW

0 / 1 mph 41 / 41°F 95% 1026 mb
Low level cloud: 99%
Mid level cloud: 54%
High level cloud: 15%
Most Significant Cloud Type: low
100%
0.0 In
08:00

NW
NW

7 / 12 mph 45 / 41°F 95% 1010 mb
Low level cloud: 96%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.7 In
14:00

NW
NW

3 / 6 mph 42 / 41°F 97% 1022 mb
Low level cloud: 86%
Mid level cloud: 53%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.1 In
20:00

NNW
NNW

2 / 4 mph 48 / 48°F 89% 1009 mb
Low level cloud: 100%
Mid level cloud: 85%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.2 In
Sat 15
Feb
02:00

W
W

5 / 10 mph 37 / 33°F 66% 1021 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
08:00

N
N

1 / 2 mph 45 / 45°F 96% 1011 mb
Low level cloud: 100%
Mid level cloud: 98%
High level cloud: 2%
Most Significant Cloud Type: low
100%
0.4 In
14:00

E
E

6 / 11 mph 52 / 50°F 48% 1015 mb
Low level cloud: 0%
Mid level cloud: 0%
High level cloud: 0%
Most Significant Cloud Type: high
0%
0.0 In
20:00

ESE
ESE

9 / 16 mph 44 / 40°F 96% 1013 mb
Low level cloud: 99%
Mid level cloud: 100%
High level cloud: 98%
Most Significant Cloud Type: low
100%
0.4 In
Sun 16
Feb
02:00

W
W

3 / 6 mph 41 / 39°F 61% 1018 mb
Low level cloud: 0%
Mid level cloud: 4%
High level cloud: 0%
Most Significant Cloud Type: medium
3%
0.0 In
08:00

NNE
NNE

5 / 11 mph 38 / 33°F 99% 1016 mb
Low level cloud: 100%
Mid level cloud: 61%
High level cloud: 6%
Most Significant Cloud Type: low
100%
0.5 In
14:00

ENE
ENE

6 / 12 mph 49 / 47°F 43% 1021 mb
Low level cloud: 0%
Mid level cloud: 7%
High level cloud: 0%
Most Significant Cloud Type: medium
8%
0.0 In
20:00

NW
NW

4 / 9 mph 40 / 37°F 100% 1019 mb
Low level cloud: 91%
Mid level cloud: 62%
High level cloud: 0%
Most Significant Cloud Type: low
100%
0.7 In
Mon 17
Feb
02:00

WNW
WNW

5 / 10 mph 39 / 35°F 66% 1023 mb
Low level cloud: 16%
Mid level cloud: 10%
High level cloud: 0%
Most Significant Cloud Type: low
19%
0.0 In
08:00

ESE
ESE

8 / 17 mph 36 / 29°F 94% 1020 mb
Low level cloud: 80%
Mid level cloud: 95%
High level cloud: 82%
Most Significant Cloud Type: low
100%
0.6 In
14:00

NNE
NNE

2 / 4 mph 41 / 41°F 77% 1023 mb
Low level cloud: 99%
Mid level cloud: 11%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.0 In
20:00

E
E

3 / 7 mph 39 / 37°F 94% 1016 mb
Low level cloud: 95%
Mid level cloud: 100%
High level cloud: 100%
Most Significant Cloud Type: low
100%
0.3 In

Other Locations Near to Katerini

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