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
86.0
78
79
78
96
90
February
80.8
71
74
79
87
87
March
87.8
89
71
89
95
91
April
90.4
88
96
84
86
May
86.9
84
85
85
94
June
85.1
81
78
90
80
July
76.9
76
64
69
77
August
71.1
69
62
66
81
September
76.0
72
69
82
71
October
78.1
68
69
91
73
November
80.5
76
63
90
90
December
85.7
88
69
86
90
Average
82.8
79.5
77.0
75.5
84.1
83.7
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
6.2
5
7
6
7
4
February
5.6
8
5
7
5
7
March
8.2
10
5
10
9
8
April
11.7
10
11
13
12
May
15.9
19
13
14
16
June
17.8
19
18
21
16
July
20.1
21
21
19
19
August
20.6
22
22
20
19
September
17.0
18
19
15
20
October
11.2
14
15
11
12
November
7.8
9
5
8
8
December
5.2
8
2
1
7
Average
11.7
7.6
13.1
12.6
11.9
12.3
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
1.1
1
2
1
1
-1
February
-1.1
-1
1
1
-1
1
March
0.1
-1
-2
3
2
-1
April
2.6
3
1
2
3
May
6.2
6
5
6
7
June
9.1
8
9
11
9
July
11.0
11
12
11
11
August
11.8
12
13
12
12
September
8.9
8
8
10
11
October
4.9
6
7
5
6
November
2.9
3
0
4
3
December
-1.8
3
-5
-5
3
Average
4.2
-1.8
4.9
4.9
4.9
5.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
37.5
46
45
40
22
44
February
35.5
43
61
34
33
24
March
32.2
28
43
42
29
26
April
32.0
46
43
26
19
May
21.4
6
43
30
17
June
23.2
17
32
23
33
July
19.7
21
37
12
22
August
17.8
19
23
19
31
September
21.3
29
22
34
19
October
25.9
35
32
31
29
November
39.0
48
35
54
40
December
30.8
49
18
22
34
Average
27.1
38.4
33.7
34.1
27.0
27.1
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
4.6
4
5
5
0
7
February
4.9
4
7
5
0
5
March
4.6
5
4
6
0
7
April
4.9
6
6
1
5
May
4.3
4
5
4
4
June
4.3
4
4
4
4
July
3.9
4
4
4
4
August
4.0
4
4
4
5
September
4.2
4
4
5
4
October
4.0
4
5
5
0
November
4.3
5
4
7
0
December
4.0
6
3
5
0
Average
4.3
4.3
4.6
4.7
3.3
3.7
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
130°
144°
155°
360°
141°
February
134°
163°
154°
360°
164°
March
126°
146°
155°
360°
143°
April
159°
144°
170°
169°
May
300°
168°
185°
135°
June
233°
194°
215°
209°
July
184°
184°
192°
213°
August
164°
178°
200°
171°
September
164°
155°
163°
169°
October
144°
172°
157°
360°
November
150°
122°
157°
360°
December
150°
109°
127°
360°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.