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
56.7
49
49
44
65
70
February
58.6
49
59
46
65
74
March
65.3
69
74
59
74
56
April
72.3
66
75
78
67
May
63.4
54
65
48
60
June
0
0
0
0
July
86.9
95
96
81
84
August
81.3
77
84
71
81
September
64.8
64
56
65
71
October
57.1
47
50
52
76
November
68.3
60
71
57
60
December
55.5
100
50
50
0
Average
67.6
59.3
64.7
64.9
66.3
69.9
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
-26.2
-26
-28
-27
-23
-26
February
-31.5
-28
-35
-32
-25
-32
March
-25.1
-25
-25
-24
-27
-26
April
-17.7
-14
-18
-15
-17
May
-5.1
-1
-6
-5
-6
June
5.5
6
7
5
5
July
12.3
14
15
10
14
August
9.9
11
10
9
11
September
2.9
5
4
4
3
October
-5.9
-1
-4
0
-4
November
-16.1
-11
-20
-12
-17
December
-23.2
-18
-24
-23
-24
Average
-12.5
-27.7
-8.1
-10.8
-9.5
-10.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.