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
January
0.0
0
0
February
0.0
0
0
0
March
0.0
0
0
0
0
April
0.0
0
0
0
May
0.0
0
0
0
June
0
0
0
July
0.0
0
0
0
August
0.0
0
0
September
3.8
17
0
0
October
0.0
0
0
0
November
0.0
0
0
0
December
0
0
0
Average
0.5
3.0
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
January
-15.7
-19
-23
February
-16.1
-34
-23
-28
March
-14.4
-18
-5
-18
-20
April
-9.4
-14
-10
-8
May
0.6
3
2
1
June
7.1
11
9
11
July
9.3
14
12
16
August
8.4
12
11
September
6.4
6
6
7
October
-2.0
-1
-2
-3
November
-9.5
-3
-8
-13
December
-15.9
-14
-13
-19
Average
-7.2
-19.5
-4.0
-4.0
-4.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.