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
70.4
65
64
80
73
74
February
75.0
76
68
76
79
83
March
81.1
82
77
66
94
81
April
80.0
74
80
88
86
May
86.7
92
84
89
88
June
87.8
81
91
85
90
July
91.0
92
90
89
90
August
87.2
86
86
91
81
September
85.7
85
80
88
91
October
78.6
73
87
78
85
November
76.1
83
87
82
77
December
68.9
72
59
72
57
Average
80.9
73.7
79.8
81.5
84.8
82.9
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
-7.9
-5
-4
-10
-5
-5
February
-5.7
-1
-4
-6
-6
-4
March
0.8
4
1
0
4
2
April
8.1
10
8
12
7
May
17.0
18
20
17
16
June
22.0
23
22
22
23
July
24.6
24
24
23
26
August
22.9
22
23
25
22
September
18.7
21
19
18
16
October
11.5
12
12
14
8
November
2.4
2
6
3
7
December
-4.9
0
-2
-1
-3
Average
8.3
-1.3
10.4
10.1
10.5
9.5
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
-15.5
-11
-11
-22
-12
-12
February
-14.2
-10
-14
-17
-16
-14
March
-9.4
-5
-8
-9
-8
-7
April
-2.6
0
-1
1
-3
May
5.9
5
9
5
5
June
11.3
12
12
13
11
July
14.6
15
13
14
16
August
13.4
12
14
15
13
September
9.3
10
9
9
8
October
3.9
6
3
7
1
November
-5.2
-5
-3
-4
-1
December
-11.7
-6
-7
-10
-10
Average
-1.3
-9.3
1.3
0.5
1.4
0.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
46.4
57
56
40
38
41
February
41.1
29
55
51
38
34
March
29.2
30
35
43
19
22
April
25.5
31
24
18
21
May
14.9
12
14
9
15
June
10.8
12
11
13
7
July
7.6
10
8
11
8
August
9.5
14
12
4
15
September
12.6
9
15
17
10
October
21.2
34
19
18
15
November
36.6
34
30
25
31
December
40.5
34
44
30
52
Average
24.7
40.0
25.9
23.6
18.2
20.6
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
8.4
8
7
8
7
9
February
9.4
9
10
9
8
9
March
9.7
9
10
10
10
9
April
9.9
9
10
9
9
May
8.9
8
8
9
8
June
8.2
7
8
8
7
July
7.7
7
8
7
7
August
7.5
7
7
7
7
September
7.7
7
7
8
8
October
8.9
8
8
8
9
November
9.4
9
9
8
9
December
8.6
8
9
9
9
Average
8.7
8.4
8.0
8.4
8.2
8.3
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
212°
021°
225°
336°
336°
February
237°
207°
249°
196°
241°
March
213°
337°
233°
257°
190°
April
189°
258°
330°
266°
May
294°
209°
248°
278°
June
033°
243°
237°
238°
July
239°
240°
281°
254°
August
294°
270°
224°
238°
September
213°
309°
239°
225°
October
265°
201°
109°
225°
November
236°
224°
218°
217°
December
029°
124°
207°
308°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.