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
87.1
84
74
90
84
98
February
80.1
75
71
95
99
87
March
75.9
63
60
90
71
78
April
89.7
91
90
84
77
May
80.8
72
73
92
93
June
81.1
88
100
100
92
July
85.6
90
80
96
80
August
93.5
92
90
93
96
September
92.8
85
95
96
95
October
83.9
79
70
93
88
November
81.4
78
72
91
90
December
82.2
81
71
71
94
Average
84.0
71.0
80.0
83.7
89.3
87.9
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
-16.9
-15
-13
-20
-13
-18
February
-15.6
-11
-16
-18
-21
-22
March
-10.3
-11
-11
-9
-13
-11
April
-4.6
-11
-3
-6
-3
May
5.3
2
3
5
9
June
12.7
11
11
12
11
July
16.1
17
14
14
14
August
13.8
15
12
12
15
September
9.2
7
10
7
8
October
0.7
-1
-1
-1
1
November
-8.3
-6
-8
-16
-6
December
-13.9
-15
-8
-15
-13
Average
-2.2
-13.6
-2.3
-2.7
-3.3
-2.8
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.