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
83
69
82
61
87
February
83.6
71
71
84
93
92
March
87.8
84
89
62
89
92
April
76.9
74
35
81
84
May
88.8
83
89
84
92
June
90.4
96
82
94
81
July
91.7
97
84
93
89
August
92.0
92
88
91
93
September
88.8
87
91
80
91
October
83.5
71
81
81
93
November
78.9
87
73
77
74
December
81.0
79
65
82
79
Average
85.9
79.7
83.2
77.7
85.4
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
-13.2
-11
-12
-15
-4
-12
February
-13.4
-9
-14
-15
-11
-11
March
-6.4
-5
-7
-7
-4
-6
April
1.0
0
1
5
0
May
11.3
14
12
12
9
June
18.0
21
20
18
18
July
22.6
23
21
22
25
August
20.7
21
22
22
20
September
15.8
20
18
16
14
October
8.3
9
11
13
4
November
-3.4
-2
-1
0
-2
December
-10.0
-4
-10
-12
-9
Average
3.2
-9.7
5.9
5.7
7.1
4.2
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
-23.0
-20
-23
-29
-11
-22
February
-25.4
-20
-29
-29
-24
-21
March
-18.0
-17
-20
-16
-16
-18
April
-9.3
-8
-5
-5
-11
May
-1.9
1
2
0
-1
June
5.8
7
9
5
6
July
10.3
11
10
9
13
August
9.3
9
10
10
10
September
6.1
7
6
8
6
October
0.8
1
2
5
-3
November
-10.6
-9
-7
-6
-10
December
-19.3
-12
-20
-22
-18
Average
-8.7
-19.1
-6.6
-5.3
-4.6
-6.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
28.6
40
35
31
13
30
February
22.6
29
38
30
14
11
March
16.4
20
23
9
25
13
April
17.2
39
14
5
15
May
13.4
17
14
17
18
June
8.4
6
17
6
8
July
9.4
10
18
3
6
August
8.9
12
13
12
10
September
9.3
2
9
13
17
October
17.2
20
29
11
21
November
31.3
33
41
30
33
December
30.2
22
47
32
37
Average
17.1
28.9
20.7
21.4
14.0
16.6
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
7.3
9
7
10
6
7
February
7.5
8
8
9
7
9
March
8.1
10
9
7
11
9
April
7.5
10
5
9
9
May
7.6
9
9
9
9
June
7.1
8
9
8
8
July
6.6
7
8
7
8
August
6.3
7
8
9
8
September
5.8
7
9
8
9
October
6.0
8
9
6
8
November
6.5
9
9
9
8
December
6.3
7
7
8
8
Average
7.0
9.0
7.9
8.3
8.1
8.4
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
294°
291°
260°
241°
278°
February
325°
270°
271°
251°
288°
March
324°
343°
300°
318°
330°
April
358°
026°
033°
346°
May
344°
321°
344°
330°
June
049°
287°
039°
025°
July
244°
315°
007°
316°
August
360°
264°
271°
023°
September
315°
286°
287°
265°
October
338°
275°
307°
258°
November
264°
302°
284°
278°
December
258°
299°
263°
272°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.