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
82.3
70
49
92
96
93
February
81.1
79
55
100
92
86
March
78.8
87
67
72
98
88
April
79.4
81
66
92
92
87
May
67.2
67
73
71
85
June
58.1
74
60
56
71
July
62.7
70
55
38
71
August
70.4
69
70
64
79
September
73.5
89
86
44
58
October
76.0
81
47
41
83
November
86.1
91
89
51
95
December
86.8
78
82
82
92
Average
75.1
79.6
71.4
75.1
67.8
81.7
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
15.6
16
11
17
18
16
February
15.3
15
10
19
17
17
March
16.1
16
14
18
16
15
April
17.9
17
17
20
18
19
May
17.9
17
19
17
20
June
20.1
18
22
19
21
July
21.5
22
21
21
21
August
22.1
24
23
22
25
September
22.0
22
26
21
21
October
21.3
23
21
18
24
November
18.9
20
18
20
19
December
16.4
17
15
14
18
Average
18.5
16.0
17.9
19.9
18.4
19.6
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
8.1
11
1
10
10
10
February
7.3
10
0
10
10
9
March
8.6
10
9
11
9
10
April
9.4
9
10
11
10
11
May
10.2
11
11
11
12
June
12.5
13
12
11
13
July
12.3
14
14
14
14
August
10.9
15
16
15
15
September
11.6
15
17
14
13
October
11.4
13
15
11
16
November
10.9
12
12
12
11
December
9.6
10
9
10
10
Average
10.2
10.0
10.2
12.2
11.4
12.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.3
5
3
1
4
1
February
4.2
14
2
0
0
1
March
4.6
6
9
2
1
6
April
1.2
3
0
0
0
5
May
0.6
1
1
0
0
June
1.9
1
7
3
1
July
0.9
0
4
1
1
August
0.5
3
0
0
0
September
0.5
1
0
1
0
October
1.4
0
0
8
0
November
1.4
2
2
1
1
December
3.2
5
1
8
1
Average
2.4
6.6
2.0
1.6
2.0
1.3
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
9.8
12
7
8
11
12
February
10.9
9
11
10
14
9
March
11.8
13
12
13
14
11
April
13.4
11
13
15
15
12
May
12.5
10
14
12
13
June
10.1
10
10
11
10
July
8.8
7
11
9
10
August
9.8
10
11
9
9
September
9.3
10
10
8
8
October
8.6
10
9
9
7
November
9.1
9
11
8
9
December
9.6
8
9
10
11
Average
10.5
11.2
9.8
10.9
10.8
10.1
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
319°
322°
332°
318°
302°
February
287°
302°
322°
319°
321°
March
304°
300°
309°
310°
286°
April
311°
317°
314°
308°
307°
May
301°
314°
311°
305°
June
305°
317°
309°
308°
July
319°
310°
303°
305°
August
312°
312°
297°
303°
September
312°
312°
304°
311°
October
317°
310°
305°
322°
November
330°
315°
327°
318°
December
324°
291°
294°
320°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.