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
80.9
77
68
80
88
92
February
83.0
91
83
76
82
83
March
83.8
78
89
79
91
84
April
84.9
88
79
90
91
89
May
88.5
93
86
90
95
June
89.3
83
90
93
94
July
87.2
78
98
73
91
August
89.4
83
92
86
96
September
86.2
79
81
89
94
October
82.3
85
80
79
82
November
88.6
92
93
96
90
December
82.2
72
87
82
84
Average
85.5
83.5
82.2
86.4
86.4
90.0
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
3.3
3
6
2
3
6
February
5.6
6
7
5
2
6
March
8.9
9
9
11
11
12
April
14.4
14
16
15
16
12
May
20.7
22
22
21
21
June
25.8
24
26
28
27
July
28.4
28
31
26
30
August
28.0
26
31
28
29
September
23.8
23
23
24
24
October
18.1
19
18
19
17
November
10.8
9
14
11
14
December
5.7
8
7
8
6
Average
14.9
7.9
16.4
17.4
16.4
16.9
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
-5.2
-4
-1
-9
-5
-3
February
-5.8
-4
-4
-6
-6
-3
March
-1.2
1
0
-1
-1
1
April
4.1
3
5
4
4
3
May
9.2
8
10
9
9
June
14.3
14
14
16
15
July
17.3
17
18
16
19
August
17.1
16
17
19
17
September
13.1
14
11
15
12
October
7.7
8
7
10
6
November
0.5
-1
3
0
2
December
-3.1
0
-1
-1
-3
Average
5.0
-1.1
6.2
5.9
6.3
6.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.6
15
22
14
9
4
February
13.1
5
14
17
19
11
March
12.9
17
13
12
5
12
April
14.4
16
8
8
13
22
May
7.2
6
4
8
4
June
5.6
8
5
4
3
July
7.1
10
3
14
2
August
5.9
12
3
6
4
September
8.3
14
9
10
4
October
10.9
8
10
12
14
November
9.6
9
8
4
8
December
14.6
16
16
8
13
Average
10.5
13.9
11.1
8.0
9.2
8.0
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
7.7
7
6
9
8
8
February
7.7
8
8
8
7
7
March
9.2
9
9
8
9
9
April
8.8
8
8
9
10
10
May
7.8
8
8
8
9
June
6.8
6
7
7
7
July
6.1
5
7
6
6
August
6.2
6
7
6
7
September
6.2
5
6
7
7
October
6.7
6
6
7
7
November
7.4
7
8
7
7
December
7.0
6
10
6
7
Average
7.3
7.9
6.7
7.6
7.1
7.5
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
299°
302°
291°
309°
274°
February
286°
289°
266°
307°
268°
March
313°
319°
278°
277°
337°
April
339°
043°
292°
313°
301°
May
297°
093°
303°
266°
June
114°
247°
233°
216°
July
195°
239°
312°
205°
August
235°
234°
206°
253°
September
356°
295°
242°
217°
October
281°
342°
340°
265°
November
282°
253°
269°
262°
December
279°
311°
281°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.