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MY WEATHER OBSERVATIONS FOR SEPTEMBER 1999

Date Sunshine (Hours) Rainfall (Inches) Maximum Temperature (Faraneit) Minimum Temperate (Faraneit) Wind Direction Additional Comments
September 1
10.0
0.00
75
54
South
September 2
11.8
0.00
79
59
South
September 3
11.3
0.00
80
57
South-West
September 4
10.2
0.00
82
56
Calm
September 5
12.3
0.00
80
52
Calm
September 6
10.9
0.00
83
56
South-East
September 7
9.4
0.30
73
59
South-West
September 8
10.1
0.06
72
52
South
September 9
11.1
0.00
70
50
West
September 10
10.8
0.00
73
44
West
September 11
2.8
0.06
80
59
South
September 12
9.6
0.20
69
50
Calm
September 13
8.9
0.00
67
50
Calm
September 14
7.0
0.00
66
43
Calm
September 15
0.0
0.00
64
52
Calm
September 16
4.2
0.14
63
50
South
September 17
10.0
0.00
68
47
South
September 18
2.9
0.12
64
40
West
September 19
0.0
0.63
65
59
South
September 20
2.1
0.86
67
60
South-West
September 21
8.2
0.00
68
54
South-West
September 22
5.0
0.23
66
50
South-East
September 23
6.1
0.08
70
55
South
September 24
4.7
0.06
66
56
South
September 25
3.3
0.43
67
54
Calm
Thunderstorm 9-10pm. Most of rain fell then
September 26
0.6
0.50
59
52
Calm
September 27
1.4
0.37
62
50
South
September 28
1.3
0.00
63
52
North-West
September 29
4.6
0.40
66
54
South
September 30
2.2
0.26
61
50
West
192.8 hours
117.3 mm
69.7
52.5
Average
135 hours
50 mm
64
47

The mean temperature for September 1999 was 16.2C (61F).

The usual mean temperature for September is 13.5C (56.1F)

September 1999 was the warmest September since 1949 and the second warmest of the 20th Century. It was the sunniest recorded since 1959. As a month, it was warmer than June 1999 and almost as warm as August 1999. It was sunnier than August this year. However it was also the wettest September since 1993 and so far is the wettest month of 1999.

The Highest Day Maxima was 83F on September 6th.

The Lowest Day Maxima was 59F on September 26th.

The Highest Night Minima was 60F on September 20th.

The Lowest Night Minima was 40F on September 18th.

The Sunniest Day was September 5th with 12.3 Hours.

The Wettest Day was September 20th with 0.86 inches of rain (21.8 millimetres).

The Highest Air Pressure was 1030 MB on September 10th.

The Lowest Air Pressure was 990 MB on September 20th.

The prevailent wind direction was South, South-East, South-West and Calm

There were two sunless days recorded during the month. There was one thunderstorm on 25th September.

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