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
61.2
86
78
51
53
0
February
63.5
76
81
63
36
70
March
65.1
69
80
87
37
82
April
69.9
86
94
39
82
May
78.3
90
88
73
95
June
61.2
79
15
66
33
July
49.7
63
1
41
0
August
58.8
71
59
0
September
59.3
89
88
0
October
56.3
94
79
90
0
November
63.7
93
87
58
0
December
47.0
75
74
0
1
Average
61.5
75.8
80.8
65.8
54.5
31.9
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
1.0
3
0
2
0
-3
February
2.2
3
0
4
0
1
March
2.1
2
0
5
0
0
April
4.7
3
6
4
0
May
7.8
9
12
8
0
June
8.0
12
4
13
0
July
11.4
15
1
16
0
August
12.0
16
11
0
September
9.6
12
12
0
October
5.7
9
2
8
0
November
2.2
5
0
-1
0
December
2.0
2
0
1
0
Average
4.9
2.6
6.9
3.9
6.0
-1.8
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
-3.7
-3
0
-3
0
-8
February
-1.5
-1
0
0
0
-1
March
-1.1
-3
0
0
0
0
April
1.0
0
0
2
0
May
3.6
4
4
3
0
June
4.2
6
1
7
0
July
7.0
10
0
8
0
August
7.6
10
6
0
September
5.7
7
7
0
October
2.9
4
1
3
0
November
0.2
2
0
-6
0
December
-2.8
-3
0
-3
0
Average
1.3
-2.0
3.2
0.2
2.2
-1.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
16.6
25
32
21
11
0
February
21.8
50
20
29
10
20
March
22.1
35
26
40
5
16
April
18.0
22
21
7
19
May
20.8
29
12
25
17
June
10.2
25
0
7
4
July
11.4
26
0
3
0
August
11.6
25
4
0
September
8.6
19
13
0
October
12.6
7
39
22
0
November
11.8
23
21
3
0
December
17.3
36
26
0
0
Average
16.9
36.6
24.2
19.5
9.2
6.5
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
5.3
0
0
0
0
13
February
6.5
13
0
6
0
3
March
5.5
11
0
11
0
0
April
4.5
0
11
0
0
May
4.2
0
11
0
0
June
1.8
0
1
0
0
July
3.2
0
0
0
0
August
4.7
0
7
0
September
5.7
0
11
0
October
7.0
0
2
14
0
November
7.1
0
0
14
0
December
7.0
0
0
12
0
Average
5.7
8.2
5.4
4.1
0.9
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
360°
360°
360°
360°
333°
February
041°
360°
152°
360°
222°
March
326°
360°
046°
360°
360°
April
360°
093°
360°
360°
May
360°
334°
360°
360°
June
360°
235°
360°
360°
July
360°
063°
360°
360°
August
360°
296°
360°
September
360°
298°
360°
October
360°
309°
307°
360°
November
360°
360°
312°
360°
December
360°
360°
296°
360°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.