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
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
July
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
-25.1
-24
-30
-28
-19
-30
February
-28.2
-24
-34
-30
-24
-31
March
-23.3
-22
-22
-23
-24
-26
April
-15.6
-15
-15
-11
-15
May
-4.4
-4
-5
-3
-4
June
4.4
4
5
5
July
8.5
9
7
11
August
8.1
9
8
8
8
September
2.0
4
3
1
2
October
-5.4
-4
-6
1
-3
November
-16.1
-11
-19
-14
-17
December
-20.4
-18
-15
-19
-19
Average
-12.7
-24.7
-13.0
-10.5
-8.3
-10.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.