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
81.7
68
74
77
90
92
February
87.8
93
92
84
86
82
March
87.5
87
80
90
97
86
April
92.6
97
94
94
89
May
92.4
97
93
97
92
June
95.0
87
100
98
99
July
97.2
94
98
93
99
August
98.3
96
98
99
100
September
96.3
97
92
96
94
October
94.8
95
99
97
94
November
94.5
96
87
97
98
December
88.0
85
87
90
86
Average
91.4
82.4
90.9
92.2
94.8
92.9
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
3.1
3
6
0
3
6
February
5.6
8
8
4
1
4
March
8.8
13
8
10
12
11
April
13.8
15
13
16
12
May
19.9
19
22
20
19
June
24.8
23
26
27
25
July
27.4
27
28
27
29
August
26.7
26
27
28
27
September
24.3
23
23
25
24
October
18.4
18
18
21
16
November
10.5
12
13
10
14
December
6.4
10
6
9
6
Average
14.8
7.9
16.1
16.3
16.5
16.0
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
-3.4
-2
1
-6
-1
0
February
-2.2
1
0
-4
-5
-2
March
1.4
4
1
1
3
3
April
6.0
7
6
8
5
May
12.3
11
14
13
11
June
18.2
17
19
21
18
July
21.3
21
22
21
23
August
20.1
18
20
22
21
September
17.5
18
17
18
16
October
11.0
12
10
14
11
November
4.0
5
5
4
7
December
1.0
5
2
2
1
Average
8.1
1.2
9.6
9.0
10.0
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
24.0
28
32
31
8
19
February
16.6
7
14
26
18
17
March
13.6
12
25
16
4
10
April
10.5
10
13
7
11
May
8.3
8
9
7
10
June
4.4
4
3
7
3
July
3.6
4
5
8
2
August
3.4
4
4
2
5
September
4.3
5
6
5
3
October
7.5
5
4
9
11
November
12.1
12
21
10
12
December
13.0
12
5
7
16
Average
10.3
15.4
10.5
11.4
7.2
9.1
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
11.3
12
10
12
10
11
February
11.6
11
12
14
11
11
March
11.6
12
12
12
12
10
April
10.6
10
11
10
11
May
9.5
9
10
9
10
June
8.4
9
9
8
8
July
7.7
7
8
8
8
August
8.1
9
8
7
8
September
9.0
8
9
10
9
October
10.6
11
12
10
10
November
11.9
12
12
12
13
December
11.0
9
10
11
13
Average
10.1
11.3
9.7
10.3
9.6
10.0
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
229°
243°
254°
256°
225°
February
262°
233°
228°
269°
265°
March
263°
262°
244°
282°
264°
April
264°
258°
266°
290°
May
005°
098°
341°
312°
June
322°
282°
224°
332°
July
280°
260°
290°
293°
August
309°
280°
281°
304°
September
360°
284°
249°
210°
October
251°
211°
230°
232°
November
235°
218°
232°
232°
December
218°
204°
210°
233°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.