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
78.8
74
82
77
75
92
February
80.6
77
70
84
81
93
March
77.1
68
67
74
78
85
April
84.1
85
76
79
90
May
87.9
86
86
90
83
June
87.5
80
89
92
83
July
90.7
90
82
95
94
August
92.4
87
96
90
95
September
88.9
76
84
87
96
October
81.1
84
73
79
82
November
74.7
80
79
64
79
December
74.3
77
61
74
76
Average
83.7
72.4
80.9
80.8
83.6
87.7
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
-14.1
-12
-13
-18
-9
-15
February
-14.8
-9
-16
-16
-10
-12
March
-5.0
-2
-4
-7
-4
-6
April
1.7
4
2
3
1
May
7.4
11
9
0
7
June
13.6
18
17
4
15
July
17.3
24
17
0
21
August
17.0
18
20
7
20
September
12.7
14
14
13
12
October
5.9
8
8
8
3
November
-4.4
-4
-3
-1
-3
December
-9.2
-7
-5
-10
-6
Average
1.4
-8.7
4.6
3.7
0.2
3.1
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
-25.4
-24
-26
-30
-15
-25
February
-26.8
-21
-30
-29
-21
-25
March
-17.9
-12
-12
-18
-18
-19
April
-8.4
-6
-5
-3
-9
May
-2.6
-1
-2
0
-1
June
4.5
7
6
1
5
July
8.8
14
9
0
10
August
8.3
10
9
4
10
September
4.4
5
6
5
4
October
-1.7
3
2
1
-3
November
-10.1
-10
-11
-6
-11
December
-18.5
-15
-15
-17
-15
Average
-8.1
-19.2
-5.0
-6.0
-6.2
-7.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
42.2
54
40
42
52
29
February
35.5
50
46
36
32
22
March
40.2
47
47
51
39
32
April
30.7
32
55
21
25
May
22.2
37
26
7
26
June
17.9
24
24
2
23
July
14.9
14
33
0
9
August
17.2
30
19
8
16
September
22.3
34
42
16
16
October
29.1
32
35
20
36
November
51.0
52
62
51
40
December
55.7
69
60
47
63
Average
29.7
49.4
36.3
39.2
20.4
25.7
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
7.2
9
6
7
8
7
February
7.9
7
7
8
9
8
March
8.9
8
8
10
9
9
April
8.4
8
9
8
10
May
8.5
9
9
9
9
June
7.4
7
8
7
7
July
6.5
5
7
6
6
August
6.4
6
6
7
6
September
7.6
7
8
8
8
October
7.6
7
8
7
8
November
7.6
7
8
7
8
December
7.6
8
7
8
8
Average
7.7
7.9
7.2
7.8
7.7
7.6
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
290°
306°
268°
322°
288°
February
279°
274°
285°
314°
284°
March
038°
015°
338°
314°
306°
April
351°
349°
045°
312°
May
326°
321°
347°
317°
June
032°
003°
311°
330°
July
151°
329°
317°
344°
August
073°
271°
290°
317°
September
017°
314°
011°
254°
October
324°
240°
033°
273°
November
266°
306°
334°
279°
December
287°
095°
293°
342°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.