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
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
-21.3
-24
-20
-25
-21
-23
February
-23.2
-18
-26
-27
-25
-25
March
-18.3
-18
-18
-19
-19
-20
April
-11.2
-8
-11
-12
-12
May
0.2
4
2
-1
-2
June
7.5
13
11
11
10
July
11.4
22
18
15
13
August
9.1
11
14
11
13
September
4.1
6
5
6
4
October
-5.6
-2
-5
-2
-6
November
-14.2
-11
-12
-13
-16
December
-20.9
-14
-22
-25
-21
Average
-8.0
-21.9
-4.7
-6.7
-7.9
-7.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.