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
81.6
94
70
80
78
88
February
74.7
62
65
53
82
82
March
80.2
96
72
77
64
84
April
89.8
96
93
85
88
May
88.2
79
83
93
92
June
86.4
88
90
75
89
July
78.6
84
75
74
70
August
75.4
77
66
85
75
September
79.1
69
78
87
91
October
82.7
81
75
88
83
November
75.6
70
61
90
86
December
80.0
68
82
73
93
Average
80.3
72.3
75.8
76.5
82.0
83.9
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
-10.2
-8
-9
-12
-10
-16
February
-6.7
-4
-7
-6
-7
-8
March
-3.7
0
-3
-2
-4
-4
April
5.1
1
5
3
7
May
12.4
9
14
14
14
June
17.2
14
20
12
17
July
17.7
17
17
17
17
August
15.6
17
15
15
18
September
11.3
10
11
9
10
October
5.4
4
5
1
6
November
-3.0
0
-2
-13
-2
December
-7.0
-8
-4
-6
-8
Average
2.9
-6.3
2.2
5.2
2.3
3.8
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
-16.2
-14
-14
-18
-13
-24
February
-13.3
-10
-14
-13
-15
-20
March
-11.8
0
-9
-8
-15
-13
April
-4.5
-8
-3
-5
-1
May
3.2
2
3
3
6
June
8.5
7
9
7
9
July
10.6
12
10
10
10
August
8.9
11
9
9
9
September
5.2
4
6
4
2
October
-1.4
-3
-1
-4
0
November
-10.8
-6
-9
-22
-9
December
-14.3
-17
-10
-12
-15
Average
-5.9
-11.3
-5.4
-2.1
-5.1
-5.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.9
15
40
15
11
11
February
33.2
55
40
48
25
27
March
19.8
4
28
9
38
18
April
13.9
13
7
19
16
May
15.3
30
6
9
11
June
12.2
24
4
25
13
July
13.7
20
22
15
8
August
20.7
18
27
15
12
September
18.6
22
31
14
3
October
16.9
17
19
12
15
November
29.3
37
51
19
18
December
27.8
43
26
23
28
Average
21.6
41.2
27.6
20.9
18.6
14.2
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
8.6
12
8
9
7
8
February
10.2
11
12
10
10
9
March
9.0
9
9
10
11
8
April
8.0
9
8
10
7
May
8.0
9
8
8
7
June
6.9
9
5
8
8
July
6.9
5
8
8
6
August
7.9
7
9
8
5
September
8.4
8
9
7
9
October
8.2
7
9
9
7
November
8.5
9
10
6
8
December
8.6
8
9
9
9
Average
8.5
10.9
8.2
8.4
8.4
7.3
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
057°
032°
023°
025°
006°
February
131°
212°
048°
047°
042°
March
346°
234°
029°
219°
058°
April
033°
081°
053°
035°
May
135°
311°
065°
128°
June
157°
178°
215°
195°
July
182°
217°
216°
238°
August
160°
228°
210°
336°
September
242°
192°
256°
015°
October
019°
183°
015°
099°
November
186°
337°
011°
065°
December
341°
077°
316°
036°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.