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
76.0
72
76
93
79
67
February
86.0
82
88
93
92
86
March
88.6
92
89
89
90
82
April
85.6
85
85
86
90
May
88.4
91
85
92
92
June
90.0
81
96
94
90
July
93.0
96
89
92
93
August
88.8
87
89
91
87
September
85.5
84
81
91
90
October
79.1
74
82
75
84
November
76.6
88
77
90
77
December
73.7
55
86
85
78
Average
85.0
82.7
83.7
87.2
88.5
85.8
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
-8.5
-6
-5
-12
-6
-5
February
-6.3
-1
-5
-8
-7
-6
March
0.2
4
-1
-1
3
1
April
7.2
8
6
10
6
May
16.7
19
18
16
15
June
22.4
23
22
24
23
July
24.1
23
23
24
26
August
22.3
22
23
24
22
September
17.8
20
18
18
15
October
9.5
11
11
14
5
November
0.5
1
3
1
5
December
-6.9
-1
-5
-5
-4
Average
7.3
-2.8
9.6
8.6
9.8
8.6
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
-17.4
-12
-13
-26
-13
-14
February
-18.9
-13
-17
-22
-20
-16
March
-12.7
-8
-13
-11
-9
-10
April
-5.7
-3
-3
-1
-7
May
4.0
4
7
4
3
June
9.6
10
10
11
10
July
12.3
12
12
11
14
August
11.4
10
12
14
12
September
7.6
8
8
8
6
October
2.0
4
2
5
-2
November
-7.7
-6
-4
-5
-4
December
-13.3
-7
-12
-12
-12
Average
-3.1
-11.3
-1.2
-2.1
-1.5
-2.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
45.0
56
35
50
33
49
February
42.7
31
42
46
36
46
March
31.8
29
33
37
33
35
April
28.3
31
36
21
26
May
16.1
14
18
12
17
June
13.5
13
13
11
15
July
9.4
9
13
8
10
August
9.9
14
11
4
13
September
16.0
11
15
14
19
October
26.4
29
22
17
34
November
43.4
37
38
31
40
December
43.8
28
37
46
52
Average
26.6
37.7
23.0
25.6
20.2
27.0
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
6.3
6
6
7
6
7
February
6.7
6
8
7
5
8
March
7.4
7
7
8
9
8
April
7.4
7
7
7
7
May
6.8
7
7
7
7
June
6.6
6
7
7
7
July
5.9
5
6
5
6
August
5.9
5
6
6
6
September
6.3
6
6
6
7
October
6.8
7
7
6
7
November
6.8
7
8
6
7
December
6.1
6
6
7
6
Average
6.6
6.5
6.4
6.8
6.4
6.7
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
240°
159°
221°
248°
282°
February
246°
245°
269°
236°
251°
March
249°
003°
303°
254°
223°
April
339°
186°
013°
305°
May
343°
199°
254°
319°
June
018°
238°
238°
243°
July
248°
247°
330°
253°
August
298°
227°
220°
241°
September
230°
269°
248°
219°
October
320°
214°
061°
216°
November
229°
242°
225°
228°
December
201°
111°
220°
263°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.