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
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
-17.2
-18
-13
-21
-14
-16
February
-18.9
-8
-18
-19
-19
-17
March
-7.7
-5
-9
-7
-5
-9
April
2.4
6
2
1
0
May
13.3
22
11
9
10
June
20.3
20
21
21
20
July
22.9
23
23
24
23
August
20.4
22
22
21
16
September
12.7
18
14
12
October
3.8
7
4
7
1
November
-8.4
-3
-6
-5
-9
December
-16.7
-5
-18
-21
-14
Average
0.8
-13.8
6.4
1.2
2.9
0.8
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.