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
-21.7
-24
-16
-24
-19
-23
February
-19.0
-15
-22
-22
-24
-19
March
-11.9
-10
-11
-12
-13
-12
April
0.0
3
-1
-3
-2
May
12.6
20
11
10
8
June
19.7
21
22
21
19
July
22.7
25
23
24
21
August
20.1
22
22
20
19
September
13.7
16
16
12
12
October
2.4
4
4
4
0
November
-11.7
-7
-10
-9
-12
December
-19.8
-10
-21
-25
-17
Average
-1.1
-17.6
3.8
1.4
-1.9
-1.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.