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
83.5
88
84
82
85
93
February
77.5
71
80
67
86
75
March
80.7
81
82
83
77
80
April
81.9
88
84
78
80
May
82.3
80
81
83
74
June
74.6
81
70
73
67
July
62.9
42
68
73
68
August
73.0
83
74
67
72
September
81.7
81
89
80
80
October
81.4
67
75
94
91
November
83.8
85
81
86
84
December
81.1
76
92
84
86
Average
78.1
79.6
75.8
77.5
79.3
77.7
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
-6.7
-5
-5
-6
-2
-8
February
-7.6
-3
-9
-8
-3
-6
March
-2.2
0
1
-4
-2
-3
April
2.5
4
3
6
2
May
6.6
7
7
8
6
June
12.0
13
13
14
11
July
16.3
19
17
16
16
August
17.7
18
19
18
17
September
13.7
15
16
14
14
October
8.7
10
10
9
9
November
2.1
1
0
5
3
December
-2.7
0
1
-2
2
Average
4.4
-3.5
6.2
5.9
6.7
5.2
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
-14.8
-13
-13
-16
-7
-15
February
-15.4
-9
-19
-17
-10
-15
March
-8.0
-5
-6
-10
-8
-11
April
-3.0
-3
-1
1
-3
May
0.6
1
1
2
1
June
5.2
5
6
7
6
July
10.0
13
11
9
10
August
11.8
12
13
12
12
September
7.2
8
8
8
8
October
2.9
4
5
2
3
November
-4.5
-5
-5
0
-4
December
-8.2
-6
-5
-9
-4
Average
-2.0
-10.8
-1.4
-1.4
0.5
-1.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
31.6
24
28
43
26
18
February
36.0
52
24
42
30
41
March
27.8
24
28
25
34
24
April
22.0
13
29
27
22
May
20.9
22
18
26
27
June
25.8
29
21
26
25
July
25.3
41
24
22
21
August
19.9
21
20
14
27
September
19.5
21
19
21
18
October
20.2
26
27
13
16
November
25.6
20
28
25
18
December
30.9
34
22
27
29
Average
25.6
32.6
25.9
25.0
23.9
23.5
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
12.1
13
11
13
10
10
February
12.4
12
11
14
11
13
March
13.3
14
12
14
12
13
April
12.1
11
12
14
12
May
11.0
11
10
11
10
June
9.2
11
9
7
10
July
7.9
7
9
9
8
August
9.2
10
8
9
10
September
11.1
10
10
11
12
October
10.9
11
12
11
12
November
12.5
11
10
12
11
December
12.6
13
16
13
11
Average
11.2
13.4
10.3
11.0
10.6
10.9
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
295°
352°
318°
360°
319°
February
286°
278°
326°
353°
271°
March
100°
035°
011°
236°
292°
April
060°
047°
067°
193°
May
042°
359°
004°
316°
June
065°
031°
224°
142°
July
158°
200°
195°
180°
August
125°
202°
232°
189°
September
066°
187°
220°
237°
October
341°
240°
035°
248°
November
280°
003°
109°
258°
December
290°
069°
303°
042°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.