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
February
92.7
95
92
72
100
98
March
86.2
90
97
72
83
92
April
89.5
100
90
86
74
May
0
0
0
0
June
0
0
0
0
July
0
0
0
0
August
95.3
100
100
100
94
September
84.2
77
91
82
87
October
81.1
76
70
81
91
November
0
0
0
0
December
0
0
0
0
Average
86.4
90.2
87.7
82.5
84.1
87.6
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
-32.1
-34
-31
-33
-27
-37
February
-33.5
-34
-32
-34
-31
-36
March
-30.4
-30
-25
-27
-27
-32
April
-21.1
-23
-22
-16
-17
May
-7.7
-8
-6
-5
-6
June
6.1
5
5
8
9
July
12.0
14
12
9
16
August
7.4
9
9
8
6
September
-3.1
-2
-1
-3
-3
October
-14.3
-13
-16
-9
-13
November
-26.1
-25
-30
-24
-23
December
-27.7
-27
-24
-26
-28
Average
-16.1
-33.5
-14.9
-14.7
-12.1
-14.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.