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
77.9
84
63
77
70
90
February
74.2
73
72
58
82
77
March
81.4
76
64
91
66
85
April
84.1
83
74
99
92
78
May
90.9
84
96
93
92
June
77.4
82
100
91
85
July
78.0
76
83
78
79
August
84.9
82
77
92
88
September
93.9
99
87
94
98
October
91.5
95
90
94
88
November
90.3
85
86
94
82
December
79.2
57
88
55
90
Average
83.4
77.9
78.4
84.9
86.3
86.1
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
-5.4
-3
-2
-6
-1
-13
February
-3.6
-2
-4
-1
-3
-4
March
-2.3
-6
-1
0
-6
-2
April
3.4
-3
-1
3
4
4
May
9.8
8
12
11
12
June
14.0
12
21
13
12
July
16.2
16
16
16
17
August
14.9
16
15
15
17
September
12.3
11
12
11
12
October
7.1
6
7
6
7
November
-1.8
-1
0
-11
0
December
-4.1
-11
-2
-4
-4
Average
4.6
-4.5
4.9
5.0
5.1
5.8
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
-11.3
-8
-10
-14
-7
-19
February
-9.6
-7
-12
-7
-9
-12
March
-9.8
-12
-7
-6
-11
-9
April
-3.8
-8
-6
-2
-2
-2
May
2.9
2
3
2
4
June
7.1
7
12
7
6
July
9.9
10
10
9
9
August
8.6
9
10
8
9
September
5.8
4
7
4
5
October
1.5
0
1
0
1
November
-6.4
-5
-4
-19
-5
December
-10.6
-18
-9
-9
-9
Average
-2.5
-9.3
-2.8
-2.8
-2.7
-2.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
23.9
21
44
24
37
5
February
29.0
48
36
39
17
31
March
21.1
25
38
19
34
12
April
17.5
7
39
11
15
18
May
18.7
35
6
16
14
June
14.3
29
0
16
13
July
14.8
26
18
21
3
August
13.9
22
23
7
7
September
19.3
24
33
13
13
October
20.8
18
23
19
18
November
19.7
13
26
12
32
December
18.6
23
21
27
17
Average
19.4
29.4
30.4
21.8
17.0
12.9
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
7.9
12
8
3
9
10
February
10.6
14
10
9
9
10
March
9.5
8
11
10
13
8
April
9.4
12
11
11
9
7
May
9.6
9
10
9
9
June
6.8
2
12
8
9
July
7.0
3
9
6
7
August
8.9
10
10
8
8
September
10.1
9
11
9
10
October
10.2
9
10
11
8
November
9.0
13
10
8
8
December
9.1
6
10
8
8
Average
9.2
11.7
7.5
9.4
8.4
8.5
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
080°
353°
003°
008°
334°
February
085°
004°
068°
010°
028°
March
003°
300°
015°
328°
332°
April
270°
022°
078°
004°
038°
May
059°
304°
087°
119°
June
091°
110°
124°
168°
July
126°
173°
178°
233°
August
144°
174°
192°
175°
September
313°
179°
315°
024°
October
021°
360°
295°
048°
November
282°
344°
342°
267°
December
344°
040°
236°
358°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.