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
80.7
78
25
100
71
83
February
90.4
92
70
94
92
98
March
90.5
87
83
91
89
93
April
90.4
83
91
93
88
May
87.4
64
100
97
97
June
0
0
0
0
July
0
0
0
0
August
93.4
94
93
87
97
September
92.8
84
89
95
97
October
87.0
77
90
94
86
November
82.5
70
74
84
95
December
0
0
0
0
Average
90.8
88.5
81.6
90.7
91.4
93.0
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
-27.2
-25
-30
-28
-19
-32
February
-30.0
-25
-34
-30
-26
-32
March
-26.6
-23
-25
-24
-26
-26
April
-17.9
-17
-16
-13
-15
May
-5.7
-5
-7
-3
-3
June
5.4
3
5
7
6
July
10.4
10
12
8
13
August
9.1
10
9
7
9
September
1.7
3
3
1
1
October
-5.2
-4
-6
0
-3
November
-17.9
-9
-21
-14
-17
December
-20.0
-20
-14
-20
-17
Average
-12.5
-25.3
-10.3
-10.5
-8.0
-10.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.