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
67.2
79
48
49
81
83
February
68.3
64
63
46
85
81
March
74.8
53
79
71
90
91
April
79.8
83
93
77
63
May
66.2
60
63
70
79
June
67.1
47
65
70
84
July
58.0
56
56
55
76
August
60.4
51
50
62
88
September
77.7
83
75
75
73
October
79.3
76
71
81
89
November
73.3
66
69
85
89
December
78.0
78
63
82
81
Average
70.2
63.1
63.1
64.3
74.4
80.8
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
3.2
3
5
3
4
0
February
3.4
3
3
4
3
3
March
4.2
4
4
5
3
4
April
6.3
5
6
7
6
May
8.8
8
9
9
10
June
12.2
11
14
11
12
July
14.2
14
14
13
15
August
15.0
15
15
15
15
September
12.9
12
13
12
13
October
9.2
9
9
8
9
November
5.5
6
5
3
5
December
4.3
4
4
3
5
Average
8.2
3.4
8.1
8.6
7.5
8.1
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
0.7
0
3
0
2
-3
February
0.6
0
0
1
0
0
March
1.0
1
0
2
0
0
April
2.7
2
3
3
3
May
4.8
5
5
4
6
June
8.4
7
10
8
8
July
10.9
11
11
10
11
August
11.3
10
12
11
12
September
9.8
9
10
9
10
October
6.4
7
6
5
6
November
2.8
3
3
0
2
December
1.7
1
1
0
2
Average
5.1
0.5
4.7
5.3
4.3
4.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
35.7
32
37
43
45
29
February
36.3
46
43
49
18
29
March
31.9
61
29
41
16
12
April
22.6
29
14
18
31
May
34.5
48
33
35
24
June
19.7
35
9
23
13
July
21.4
17
25
29
19
August
23.8
28
38
18
13
September
24.7
29
35
29
22
October
31.1
32
36
41
25
November
35.6
43
40
24
22
December
34.8
39
41
26
33
Average
29.4
48.8
33.5
32.0
26.4
21.8
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
14.4
16
13
16
17
13
February
15.0
20
14
15
15
13
March
13.5
13
14
17
11
12
April
11.5
10
10
11
10
May
11.2
12
10
11
11
June
8.9
10
8
10
10
July
8.2
7
9
9
8
August
9.0
10
10
9
9
September
10.3
11
10
13
12
October
10.9
0
14
15
13
November
11.1
0
16
13
14
December
13.7
9
15
13
15
Average
11.3
15.8
9.4
11.7
11.8
11.2
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
109°
095°
096°
109°
070°
February
129°
096°
125°
027°
126°
March
112°
058°
099°
320°
313°
April
112°
097°
074°
083°
May
111°
103°
100°
099°
June
107°
189°
102°
138°
July
156°
122°
116°
106°
August
142°
133°
222°
118°
September
135°
161°
098°
109°
October
141°
103°
115°
096°
November
360°
092°
144°
101°
December
159°
035°
035°
121°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.