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
74.0
83
0
82
90
85
February
72.1
77
0
81
87
87
March
73.1
85
0
86
88
81
April
72.3
0
84
78
87
May
58.4
0
9
84
82
June
50.4
33
0
74
59
July
47.1
52
0
56
61
August
60.6
68
0
77
76
September
71.9
73
0
89
98
October
76.7
88
0
97
90
November
73.1
70
0
90
99
December
76.6
87
0
76
92
Average
68.7
81.9
39.5
27.3
82.4
81.0
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
2.7
3
3
3
2
3
February
3.9
3
4
4
4
2
March
3.8
3
5
4
5
1
April
5.0
6
6
6
0
May
7.1
7
8
8
5
June
9.6
10
10
10
10
July
12.7
15
13
12
12
August
13.5
13
15
13
13
September
12.5
13
13
12
12
October
9.3
9
10
10
9
November
6.5
7
7
5
6
December
4.1
3
6
7
3
Average
7.0
3.0
7.9
8.2
7.4
6.3
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
-2.6
0
-2
-1
-3
-1
February
-1.7
-2
-1
-1
0
-1
March
0.3
0
1
-1
0
-1
April
1.4
2
2
2
0
May
3.0
3
3
3
3
June
5.6
5
6
6
6
July
8.0
9
7
7
8
August
9.1
9
9
9
9
September
7.7
9
7
8
6
October
4.8
5
5
5
5
November
2.4
3
3
2
2
December
-1.7
-1
2
3
-1
Average
2.8
-1.3
3.3
3.5
3.1
2.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
25.4
38
0
43
24
34
February
26.2
46
0
35
28
25
March
23.0
43
0
36
24
12
April
18.2
0
41
18
17
May
14.6
0
2
27
27
June
8.4
16
0
11
9
July
12.9
15
0
11
19
August
11.0
13
0
10
14
September
16.4
29
0
16
22
October
16.8
15
0
12
24
November
24.0
50
0
24
21
December
31.8
39
0
36
25
Average
20.4
41.9
13.8
12.3
19.8
19.9
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
14.1
19
12
14
14
14
February
16.5
14
18
14
15
15
March
14.1
13
13
13
18
13
April
13.6
14
16
14
12
May
11.5
11
9
11
12
June
10.5
11
10
10
10
July
10.9
13
10
14
10
August
10.5
10
12
7
11
September
11.6
13
15
13
11
October
13.9
11
15
17
13
November
14.5
17
13
13
17
December
14.0
12
12
17
13
Average
12.9
15.3
12.5
12.5
13.0
12.1
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
348°
217°
048°
228°
188°
February
235°
221°
180°
222°
298°
March
037°
260°
262°
243°
249°
April
252°
248°
299°
185°
May
270°
030°
351°
203°
June
272°
131°
309°
293°
July
245°
264°
242°
187°
August
252°
255°
297°
229°
September
257°
249°
276°
252°
October
270°
251°
245°
282°
November
256°
250°
042°
237°
December
257°
211°
214°
232°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.