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
-21.9
-24
-15
-23
-21
-24
February
-21.0
-20
-20
-25
-27
-25
March
-15.1
-19
-10
-10
-20
-16
April
-11.7
-9
-11
-10
-9
May
-1.5
2
1
-1
-1
June
6.5
9
5
9
7
July
13.2
16
13
15
9
August
10.9
14
12
12
11
September
5.6
8
6
6
5
October
-2.5
-1
-2
-1
-3
November
-11.9
-8
-7
-12
-12
December
-18.7
-14
-14
-21
-19
Average
-7.3
-21.0
-3.7
-5.9
-6.2
-7.6
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.