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
51.0
48
52
60
63
59
February
63.1
78
80
73
43
52
March
72.6
75
67
76
89
April
80.9
89
77
82
May
80.9
82
80
82
June
81.9
73
90
89
89
July
84.6
87
87
90
92
August
79.9
88
83
87
86
September
75.5
74
81
77
79
October
73.0
76
84
60
72
November
78.3
78
75
89
80
December
67.9
69
62
82
61
Average
73.1
67.0
77.3
79.1
78.8
76.9
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
1.1
2
4
-1
-1
3
February
5.1
7
8
4
-1
5
March
7.8
11
8
9
9
April
12.7
17
12
12
May
17.7
18
19
16
June
21.1
21
22
22
21
July
23.6
25
23
23
26
August
22.3
23
23
24
23
September
19.3
20
18
19
19
October
13.2
15
11
15
14
November
7.8
9
8
6
11
December
3.5
6
-3
8
2
Average
12.7
6.3
14.4
12.9
12.7
13.9
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
-6.2
-5
-2
-10
-6
-4
February
-4.3
-2
-3
-6
-7
-3
March
-2.7
1
-2
-1
0
April
3.2
6
3
4
May
9.5
9
10
8
June
13.1
12
13
14
14
July
16.0
17
16
15
17
August
14.8
15
15
17
15
September
12.0
13
12
12
11
October
6.3
8
5
9
6
November
0.4
0
2
-1
3
December
-3.1
0
-5
-1
-4
Average
5.0
-2.0
6.1
5.2
5.3
6.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
20.3
47
39
0
0
0
February
6.8
13
14
0
0
0
March
9.9
12
23
0
0
April
3.1
8
0
0
May
5.9
15
0
0
June
2.8
11
0
0
0
July
0.7
3
0
0
0
August
0.8
3
0
0
0
September
3.0
10
0
0
0
October
3.6
10
0
0
0
November
3.7
13
0
0
0
December
9.2
23
58
0
0
Average
4.7
23.8
13.1
0.7
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
8.8
10
9
9
7
8
February
8.2
8
9
9
6
8
March
9.1
10
9
10
9
April
8.0
8
7
8
May
7.3
7
8
6
June
6.3
7
6
5
6
July
5.0
5
5
5
5
August
5.0
6
5
5
5
September
5.5
5
5
7
5
October
7.0
7
7
8
7
November
8.0
9
8
7
8
December
8.1
9
7
9
8
Average
7.0
9.3
7.3
7.1
6.6
6.3
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
235°
239°
240°
257°
238°
February
238°
245°
230°
228°
236°
March
216°
247°
237°
238°
April
243°
249°
266°
May
150°
159°
251°
June
198°
259°
228°
228°
July
246°
238°
262°
252°
August
241°
239°
222°
214°
September
146°
226°
232°
183°
October
249°
243°
213°
227°
November
229°
210°
247°
237°
December
230°
268°
228°
245°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.