Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
68.3
64
86
57
66
60
February
77.1
75
75
69
77
76
March
76.5
75
83
54
85
84
April
71.0
75
70
78
73
62
May
64.5
58
75
61
79
June
54.4
12
70
45
78
July
74.8
83
62
82
63
August
75.9
76
69
79
75
September
47.1
56
57
20
50
October
55.3
55
40
40
67
November
61.4
67
69
56
57
December
73.3
67
89
73
63
Average
67.7
72.2
64.7
65.0
62.9
68.2
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
11.7
10
12
12
12
11
February
10.4
12
10
12
11
11
March
10.8
12
9
11
11
11
April
12.1
13
11
11
12
13
May
14.0
15
13
14
15
June
16.2
16
16
16
17
July
17.5
18
17
17
17
August
18.8
20
18
18
19
September
17.9
17
17
18
19
October
15.0
14
15
15
17
November
12.4
13
12
14
12
December
11.4
12
9
10
12
Average
13.3
11.4
13.8
13.7
13.9
14.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
5.4
0
6
6
7
7
February
3.6
1
4
5
5
5
March
4.2
1
4
6
4
5
April
6.2
5
6
6
6
7
May
8.4
9
8
8
9
June
10.2
10
10
11
10
July
10.4
7
11
11
11
August
10.1
2
12
12
12
September
9.3
0
12
11
13
October
7.7
1
10
9
10
November
5.3
1
5
9
6
December
4.6
1
3
6
6
Average
6.1
1.9
4.2
7.9
8.1
8.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
23.3
38
21
10
25
23
February
19.2
24
15
13
17
9
March
17.1
17
23
16
16
13
April
13.6
9
25
14
4
10
May
11.3
3
16
6
18
June
6.8
1
15
13
5
July
5.8
4
11
4
6
August
7.5
5
9
7
10
September
14.2
15
12
12
13
October
13.4
17
22
17
9
November
15.3
15
13
14
14
December
22.1
27
12
25
16
Average
15.6
21.2
13.7
13.7
12.5
11.7
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
10.5
8
13
9
12
12
February
8.9
7
10
10
9
9
March
9.0
9
9
9
11
9
April
8.7
7
9
9
9
8
May
10.1
10
10
11
10
June
9.8
9
9
10
10
July
9.7
10
8
11
10
August
9.1
8
8
11
11
September
6.3
9
7
9
7
October
7.6
8
5
10
9
November
7.7
7
7
9
7
December
9.0
7
8
10
9
Average
8.9
7.5
9.0
8.4
9.9
9.2
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
178°
143°
159°
172°
184°
February
173°
360°
005°
028°
003°
March
185°
159°
334°
013°
353°
April
344°
208°
258°
349°
320°
May
343°
319°
354°
298°
June
349°
320°
282°
349°
July
347°
339°
351°
351°
August
348°
336°
354°
348°
September
340°
296°
334°
238°
October
284°
309°
194°
350°
November
110°
082°
163°
154°
December
153°
054°
181°
156°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.