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
83.5
74
70
80
94
93
February
84.3
94
80
83
82
84
March
86.9
81
87
81
92
86
April
86.0
79
91
93
93
May
91.9
96
89
95
95
June
91.3
82
91
97
97
July
91.5
83
99
79
92
August
92.5
87
96
89
97
September
89.5
87
82
90
93
October
85.2
85
81
88
82
November
90.1
92
93
97
90
December
80.9
69
85
79
85
Average
87.8
82.6
83.4
88.3
89.5
91.1
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
2.6
3
5
1
2
4
February
4.7
6
5
5
2
4
March
8.4
10
8
10
11
11
April
14.6
16
15
16
12
May
21.7
23
23
22
21
June
26.3
24
26
29
28
July
29.2
29
31
26
31
August
28.2
27
31
29
29
September
23.9
24
23
24
24
October
17.7
20
18
19
17
November
9.9
9
13
11
13
December
4.7
8
7
6
5
Average
14.8
6.1
16.6
17.1
16.3
16.6
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
-6.7
-4
-2
-9
-5
-4
February
-5.4
-4
-6
-5
-6
-4
March
-1.1
1
0
0
-1
1
April
4.6
6
5
5
4
May
10.2
8
11
11
10
June
15.4
14
15
18
16
July
19.0
19
19
18
20
August
18.1
17
18
20
19
September
14.2
15
13
15
14
October
8.4
9
7
10
7
November
0.8
-1
3
1
2
December
-3.3
0
-1
-1
-3
Average
5.4
-3.8
6.8
6.5
7.2
6.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.1
22
23
16
8
6
February
13.5
6
17
15
17
15
March
12.1
15
14
13
6
12
April
15.0
13
8
13
22
May
7.5
6
5
7
4
June
7.0
12
5
4
3
July
7.4
13
4
17
2
August
5.3
10
3
7
4
September
7.3
11
10
7
4
October
10.6
8
8
10
13
November
11.6
9
11
5
11
December
14.4
14
15
13
12
Average
10.5
14.3
12.0
8.5
9.4
8.3
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
7.0
6
6
8
7
7
February
7.4
8
7
8
7
6
March
8.4
9
9
7
9
8
April
8.1
7
9
8
9
May
7.4
8
7
7
8
June
6.4
5
7
7
6
July
5.7
5
6
6
6
August
6.0
6
6
6
6
September
6.1
5
6
7
7
October
6.1
5
5
6
6
November
7.0
7
8
6
6
December
6.3
6
9
5
6
Average
6.9
7.8
6.3
7.0
6.7
6.9
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
307°
314°
312°
318°
295°
February
297°
299°
279°
325°
288°
March
310°
317°
296°
287°
318°
April
307°
312°
321°
311°
May
305°
133°
313°
276°
June
035°
255°
232°
245°
July
204°
247°
322°
193°
August
258°
241°
218°
274°
September
322°
295°
254°
220°
October
294°
288°
352°
279°
November
292°
264°
285°
274°
December
290°
310°
299°
289°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.