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
71.8
72
55
84
67
68
February
81.8
81
81
83
76
82
March
79.6
74
79
80
88
89
April
84.9
95
80
89
91
May
88.1
86
55
90
94
June
90.5
90
87
88
87
July
90.2
92
91
76
95
August
87.4
82
84
75
86
September
89.5
91
85
97
86
October
71.3
65
79
80
38
November
69.7
69
69
84
38
December
72.0
80
59
81
66
Average
82.2
75.6
80.4
80.1
82.9
79.0
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
-14.6
-16
-11
-19
-9
-12
February
-12.3
-9
-11
-16
-14
-9
March
-3.9
-4
-5
-4
1
-2
April
4.5
3
4
7
4
May
15.1
20
12
14
14
June
21.8
25
20
21
22
July
24.2
21
23
26
26
August
21.8
22
23
21
22
September
16.2
20
18
19
14
October
6.3
7
9
8
3
November
-5.6
-3
-3
-1
-3
December
-11.2
-4
-12
-14
-10
Average
3.9
-9.2
7.1
5.0
6.4
5.7
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
-22.4
-24
-18
-28
-16
-20
February
-24.1
-21
-25
-29
-26
-20
March
-15.4
-16
-18
-16
-12
-16
April
-7.6
-7
-6
-4
-8
May
2.6
6
5
1
1
June
10.4
12
8
11
10
July
12.7
12
13
13
16
August
10.6
12
12
11
8
September
6.6
10
7
10
3
October
0.2
1
0
2
-1
November
-11.7
-9
-9
-8
-5
December
-19.1
-11
-19
-23
-18
Average
-7.7
-20.4
-3.1
-6.9
-4.1
-5.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
40.1
49
57
32
36
45
February
29.4
51
38
25
31
21
March
23.7
45
36
26
18
23
April
14.9
18
30
15
16
May
11.2
13
31
7
14
June
13.9
11
29
12
19
July
8.1
17
10
4
9
August
9.4
11
13
14
7
September
10.0
7
14
6
17
October
20.0
20
33
20
7
November
40.8
47
41
30
25
December
38.8
46
55
39
35
Average
22.0
47.6
25.6
26.2
17.5
18.0
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
5.5
6
5
6
5
5
February
6.3
6
6
7
6
6
March
6.7
8
6
7
7
7
April
6.8
7
8
7
7
May
7.1
7
8
7
7
June
6.2
4
7
7
6
July
5.7
3
6
6
6
August
5.7
6
6
6
6
September
5.3
6
7
7
1
October
5.4
4
7
6
3
November
6.3
7
7
7
3
December
5.5
6
6
6
5
Average
6.2
6.7
5.4
6.8
6.5
5.4
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
291°
265°
278°
238°
243°
February
330°
270°
294°
274°
274°
March
324°
332°
306°
060°
040°
April
058°
037°
331°
316°
May
082°
078°
333°
356°
June
110°
321°
284°
090°
July
314°
305°
297°
259°
August
306°
283°
296°
268°
September
171°
275°
246°
293°
October
331°
288°
303°
276°
November
279°
309°
286°
254°
December
267°
047°
241°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.