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
0
0
0
July
0.0
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
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
-20.3
-24
-16
-23
-19
-23
February
-19.6
-14
-21
-21
-25
-20
March
-11.0
-12
-12
-14
-15
-12
April
-3.8
0
-3
-4
-2
May
10.5
15
11
9
6
June
16.8
19
16
18
17
July
21.0
24
21
21
19
August
18.4
20
21
18
17
September
11.7
14
13
11
11
October
1.5
3
2
2
-2
November
-11.5
-7
-9
-11
-12
December
-18.6
-12
-19
-23
-18
Average
-2.1
-17.4
2.2
0.3
-2.7
-2.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.