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
84.6
50
100
67
0
100
March
80.3
79
82
84
82
91
April
70.8
56
100
86
26
May
0
0
0
0
June
0
0
0
0
July
0
0
0
0
August
0
0
0
0
September
72.5
75
46
71
84
October
70.5
86
36
72
80
November
0
0
0
0
December
0
0
0
0
Average
75.7
78.0
76.3
64.0
77.8
79.4
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
-28.3
-29
-26
-28
-25
-32
February
-28.5
-26
-30
-28
-29
-31
March
-28.8
-29
-22
-26
-27
-28
April
-20.1
-21
-21
-18
-15
May
-10.9
-10
-7
-9
-8
June
1.9
2
1
4
3
July
5.8
3
6
7
5
August
3.2
4
2
3
2
September
-6.5
-4
-5
-5
-4
October
-14.5
-13
-14
-13
-14
November
-23.5
-22
-24
-21
-22
December
-25.7
-20
-21
-23
-29
Average
-15.0
-28.0
-13.8
-14.9
-13.5
-15.8
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.