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
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
-21.5
-25
-19
-23
-20
-24
February
-20.2
-18
-24
-23
-26
-23
March
-13.0
-16
-12
-16
-17
-13
April
-6.5
-9
-5
-3
-4
May
7.8
11
7
6
6
June
17.3
20
16
19
19
July
21.2
26
21
22
15
August
15.7
18
18
16
17
September
9.2
11
10
10
8
October
-2.8
-1
-2
-1
-2
November
-12.1
-9
-10
-14
-12
December
-19.8
-16
-18
-21
-20
Average
-4.4
-20.4
-1.9
-2.6
-3.8
-3.3
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.