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
75.5
74
70
91
83
75
February
89.7
78
91
91
89
91
March
93.8
93
94
91
98
82
April
92.5
95
96
98
83
92
May
96.3
99
100
98
92
June
94.9
99
99
95
100
July
96.0
85
99
99
92
August
93.0
92
96
98
95
September
89.5
72
97
89
90
October
76.8
64
79
76
78
November
76.5
57
80
77
84
December
81.9
71
77
88
85
Average
88.4
84.0
82.3
92.1
89.9
88.6
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
-23.6
-26
-16
-28
-20
-26
February
-21.8
-16
-24
-24
-26
-21
March
-14.8
-15
-13
-15
-15
-19
April
-3.9
3
1
-4
-4
-3
May
10.3
17
10
8
7
June
18.2
20
21
19
18
July
21.7
25
22
23
20
August
18.7
21
21
19
18
September
11.0
13
12
11
11
October
1.2
3
1
4
-1
November
-12.6
-8
-11
-10
-13
December
-21.6
-14
-24
-26
-18
Average
-3.8
-15.0
1.9
-1.2
-2.6
-2.5
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-28.2
-30
-22
-32
-26
-31
February
-29.4
-22
-31
-31
-33
-28
March
-22.4
-22
-23
-23
-23
-24
April
-11.6
-5
-6
-12
-10
-12
May
3.5
10
5
2
2
June
12.1
14
15
13
13
July
16.4
20
18
16
17
August
13.7
16
17
14
15
September
5.3
4
6
7
6
October
-2.2
1
-2
1
-3
November
-16.2
-12
-15
-14
-18
December
-26.8
-18
-30
-31
-23
Average
-9.8
-21.0
-5.9
-7.9
-7.1
-7.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
36.1
20
47
22
22
47
February
29.1
38
18
18
13
35
March
17.0
3
17
25
12
45
April
14.4
6
8
4
29
23
May
5.8
3
1
1
17
June
12.2
9
3
8
5
July
7.2
1
6
2
21
August
11.3
5
5
6
12
September
10.4
15
4
12
13
October
26.4
15
32
24
36
November
46.8
53
29
37
43
December
34.0
46
27
38
18
Average
18.9
17.7
17.9
14.0
15.0
24.6
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
3.8
4
4
4
3
3
February
4.6
5
4
4
5
5
March
5.3
6
4
5
5
6
April
6.4
6
6
6
8
7
May
6.2
6
6
6
7
June
6.5
6
6
7
7
July
6.8
5
7
6
8
August
6.5
6
6
6
7
September
7.0
7
7
7
7
October
7.6
8
9
7
9
November
5.2
5
7
5
5
December
4.3
5
4
4
4
Average
5.9
5.1
5.7
6.1
5.9
6.3
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
047°
001°
322°
090°
348°
February
065°
348°
024°
336°
339°
March
034°
101°
342°
109°
009°
April
351°
075°
045°
347°
012°
May
047°
083°
107°
023°
June
055°
333°
002°
114°
July
073°
082°
332°
356°
August
307°
164°
002°
041°
September
318°
282°
085°
333°
October
300°
003°
164°
321°
November
090°
350°
101°
277°
December
074°
035°
348°
284°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.