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
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0
0
0
0
July
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0
0
0
0
Average
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
-24.3
0
-29
-27
-23
-28
February
-25.1
0
-30
-30
-31
-31
March
-22.3
0
-24
-24
-27
-27
April
-18.5
-17
-18
-15
-17
May
-6.8
-3
-4
-6
-5
June
3.1
4
3
4
4
July
6.3
8
9
5
7
August
4.1
4
4
4
4
September
-1.2
4
-1
-2
-2
October
-6.3
6
-7
-4
-7
November
-16.2
0
-20
-18
-16
December
-21.5
0
-26
-26
-24
Average
-10.5
-7.8
-12.8
-12.5
-12.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.