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
75.9
70
77
68
65
93
February
71.6
45
81
67
76
87
March
69.2
59
59
59
84
83
April
73.8
68
67
58
81
May
74.1
65
83
69
71
June
71.3
45
73
92
72
July
74.8
72
46
90
85
August
78.8
63
75
94
82
September
83.7
72
73
82
93
October
81.3
65
80
78
84
November
80.8
79
80
75
87
December
77.1
69
75
78
74
Average
75.3
57.6
66.2
69.0
79.2
81.7
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
-6.6
-5
-5
-7
-2
-8
February
-7.7
-2
-10
-8
-4
-7
March
-2.9
1
0
-4
0
-2
April
2.7
3
2
4
3
May
6.8
8
8
8
7
June
14.1
13
16
18
14
July
20.0
23
19
20
19
August
19.7
19
21
22
20
September
14.7
15
15
15
17
October
9.2
11
12
8
9
November
1.9
2
1
4
2
December
-2.6
0
-1
-2
1
Average
5.1
-2.0
6.6
6.6
7.7
6.1
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
-15.4
-14
-14
-18
-8
-16
February
-16.5
-7
-22
-20
-10
-16
March
-9.2
-5
-5
-12
-10
-11
April
-4.1
-4
-2
-1
-5
May
0.0
0
0
1
1
June
4.9
3
6
7
5
July
10.1
13
9
9
11
August
10.4
11
11
11
12
September
6.1
7
7
7
7
October
2.2
3
3
3
2
November
-5.5
-6
-6
-1
-6
December
-9.6
-6
-6
-10
-6
Average
-3.1
-9.3
-2.5
-3.9
-1.9
-3.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
35.2
45
40
43
43
17
February
36.9
46
36
48
34
25
March
35.5
35
48
47
27
25
April
25.4
24
44
25
19
May
27.6
45
29
31
27
June
21.3
34
25
12
17
July
12.7
14
20
11
12
August
12.2
24
11
6
12
September
15.9
23
18
17
8
October
15.3
21
10
23
14
November
26.3
30
37
22
15
December
32.7
42
35
30
29
Average
24.5
40.9
31.5
29.6
22.0
18.1
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
9.6
11
8
10
9
10
February
9.6
7
10
10
10
10
March
10.5
8
11
11
10
12
April
9.8
9
11
8
9
May
9.7
10
10
10
10
June
9.0
8
10
10
8
July
8.0
7
7
8
8
August
8.0
7
7
9
8
September
9.0
8
9
9
10
October
9.2
9
9
9
10
November
10.2
10
10
10
10
December
10.5
11
9
12
9
Average
9.3
8.6
8.8
9.4
9.3
9.5
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
278°
295°
258°
326°
293°
February
325°
273°
289°
326°
273°
March
065°
359°
331°
264°
292°
April
357°
010°
065°
227°
May
333°
331°
338°
329°
June
017°
317°
215°
148°
July
176°
138°
178°
183°
August
121°
186°
250°
158°
September
025°
233°
287°
234°
October
318°
231°
353°
247°
November
267°
311°
217°
259°
December
288°
072°
280°
268°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.