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
0
February
0.0
0
0
0
0
March
0.0
0
0
0
0
April
0.0
0
0
May
0.0
0
0
June
0
0
July
0.0
0
0
August
0.0
0
0
September
0.0
0
0
October
0.2
1
0
0
November
0.0
0
0
0
December
0.0
0
0
0
Average
0.0
0.3
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
-13.8
-24
0
-24
February
-14.0
-18
0
-24
-27
March
-14.0
-18
0
-19
-21
April
-8.9
-9
-8
May
1.5
4
2
June
9.2
12
16
July
12.3
18
19
August
9.4
15
13
September
4.4
7
0
October
-3.4
-3
-3
-3
November
-9.6
-10
-3
-8
December
-14.2
-16
0
-21
Average
-7.1
-20.4
-6.1
-3.9
-3.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.