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
-17.8
-14
-14
-21
-15
-17
February
-15.3
-11
-17
-18
-16
-13
March
-6.7
-8
-9
-5
-2
-6
April
3.1
5
4
5
1
May
12.6
18
12
9
11
June
19.9
24
20
20
17
July
23.3
22
23
25
24
August
21.1
21
22
21
24
September
14.9
19
18
16
6
October
5.6
7
7
9
-3
November
-8.7
-4
-7
-4
-9
December
-13.7
-5
-16
-19
-6
Average
2.8
-11.0
5.7
3.5
5.6
4.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.