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
76.4
79
79
80
60
90
February
78.1
65
92
86
70
87
March
65.1
68
43
67
70
72
April
65.7
61
42
55
68
May
65.0
66
71
53
58
June
66.4
57
74
74
69
July
73.2
74
57
82
74
August
75.0
73
95
82
66
September
82.4
84
68
71
87
October
78.7
65
98
71
78
November
75.1
87
93
69
86
December
67.5
80
70
65
67
Average
72.0
70.2
70.0
73.9
68.8
74.2
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
-12.3
-10
-12
-15
-6
-14
February
-13.2
-8
-17
-16
-8
-13
March
-6.3
-4
-5
-7
-5
-7
April
-1.7
0
0
2
0
May
4.3
6
5
5
4
June
10.4
11
13
13
11
July
17.0
21
13
19
18
August
16.9
16
19
19
18
September
12.4
13
14
11
13
October
6.5
8
9
7
5
November
-2.3
-2
-3
0
-3
December
-6.7
-3
-1
-6
-4
Average
1.3
-8.7
3.2
2.9
4.3
2.5
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
-17.5
-15
-17
-21
-9
-18
February
-19.7
-13
-23
-22
-12
-19
March
-12.8
-9
-9
-13
-12
-13
April
-6.6
-5
-4
-1
-5
May
-1.3
-1
0
1
0
June
4.5
4
6
7
5
July
9.9
14
8
11
11
August
10.2
10
12
11
10
September
6.4
7
8
6
7
October
2.3
4
4
3
2
November
-5.1
-6
-6
-2
-6
December
-10.9
-7
-5
-9
-7
Average
-4.1
-13.9
-3.8
-3.4
-1.3
-3.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
43.5
39
38
48
44
26
February
44.5
58
27
38
43
46
March
43.9
43
55
36
42
42
April
38.0
35
58
46
35
May
30.4
29
30
33
36
June
28.2
35
18
32
23
July
23.5
18
42
14
22
August
24.0
31
11
18
28
September
22.9
22
38
29
26
October
27.9
29
16
27
24
November
37.0
23
28
43
25
December
47.8
48
35
51
43
Average
34.8
46.9
32.2
32.9
33.9
30.8
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
14.9
16
13
16
14
16
February
13.5
12
14
15
13
15
March
13.1
13
10
14
15
15
April
11.3
9
10
8
14
May
10.2
10
12
9
11
June
8.7
7
9
9
9
July
8.2
7
7
9
8
August
8.2
7
9
6
9
September
11.2
9
10
10
12
October
11.9
11
13
10
13
November
13.1
13
12
12
14
December
14.5
16
12
16
13
Average
11.5
13.4
10.1
11.3
10.4
12.0
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
258°
253°
247°
282°
253°
February
266°
251°
253°
265°
263°
March
290°
314°
281°
270°
272°
April
304°
323°
035°
263°
May
301°
282°
338°
315°
June
337°
288°
275°
280°
July
294°
347°
288°
284°
August
284°
247°
263°
276°
September
279°
271°
279°
250°
October
286°
250°
304°
258°
November
251°
272°
241°
260°
December
268°
187°
266°
247°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.