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
0
0
0
0
0
February
82.4
78
90
84
76
92
March
78.5
74
92
74
72
73
April
86.7
95
89
72
91
May
0
0
0
0
June
0
0
0
0
July
0
0
0
0
August
61.6
57
63
72
58
September
64.8
59
75
44
63
October
67.0
76
59
58
85
November
91.2
93
100
100
75
December
0
0
0
0
Average
74.0
75.1
77.1
74.7
64.8
75.4
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
-26.4
-25
-28
-28
-20
-26
February
-29.4
-26
-32
-30
-25
-30
March
-26.7
-24
-23
-24
-27
-28
April
-18.3
-18
-18
-14
-18
May
-7.6
-5
-7
-7
-7
June
2.0
2
1
2
3
July
7.8
11
10
5
10
August
5.5
5
7
6
5
September
-2.8
0
0
-2
-2
October
-8.5
-5
-9
-3
-7
November
-18.5
-15
-21
-17
-16
December
-22.9
-18
-20
-22
-21
Average
-13.1
-26.8
-11.7
-12.9
-11.7
-12.6
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.