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
79.3
75
59
90
84
81
February
84.0
94
75
76
94
93
March
86.5
82
71
84
90
88
April
82.3
80
74
77
82
92
May
89.6
90
89
91
98
June
92.8
80
96
95
99
July
92.8
91
90
94
94
August
89.5
87
90
93
92
September
89.3
85
87
96
92
October
91.7
93
93
91
93
November
86.4
94
68
96
91
December
78.1
75
71
85
88
Average
86.9
82.4
81.3
85.0
91.0
92.1
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
-5.6
-3
-3
-8
-3
-3
February
-3.4
5
-1
-6
-7
-2
March
3.4
6
2
1
7
4
April
9.1
12
8
7
11
9
May
17.9
19
19
19
17
June
23.9
24
24
26
25
July
26.6
25
26
28
28
August
24.9
25
25
27
25
September
21.2
22
22
23
19
October
12.5
13
15
16
9
November
3.9
6
6
5
8
December
-2.9
5
-2
-1
-1
Average
10.4
4.9
11.9
11.1
12.7
11.5
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
-12.2
-8
-9
-17
-11
-10
February
-13.1
-7
-12
-17
-16
-13
March
-7.4
-5
-8
-8
-4
-4
April
-2.7
1
-1
-2
0
-2
May
4.7
5
6
5
4
June
10.2
10
10
12
12
July
13.2
13
12
12
15
August
12.9
13
14
14
14
September
9.7
12
8
9
8
October
3.2
5
3
6
0
November
-4.1
-3
-3
-4
-1
December
-9.1
-3
-9
-10
-9
Average
0.0
-5.4
1.8
0.1
1.1
1.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.5
14
26
6
5
12
February
12.0
5
19
20
6
7
March
9.5
17
22
11
6
7
April
12.7
10
21
20
12
8
May
5.4
2
7
4
2
June
3.8
3
3
2
3
July
2.7
2
5
2
4
August
3.2
2
1
2
3
September
3.9
8
5
1
1
October
6.8
7
5
3
8
November
10.2
7
22
7
5
December
13.0
8
24
12
10
Average
7.9
11.8
10.2
9.8
4.8
5.4
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
7.9
7
8
10
7
7
February
8.7
9
9
9
8
9
March
8.7
9
10
9
10
8
April
8.9
10
10
9
7
9
May
7.7
8
8
8
8
June
7.0
6
9
7
8
July
6.3
5
7
7
6
August
6.7
6
7
8
6
September
7.0
6
7
7
7
October
8.0
7
8
7
8
November
8.3
9
9
8
9
December
7.4
6
6
8
7
Average
7.8
8.6
7.4
8.1
7.5
7.6
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
253°
292°
251°
246°
256°
February
272°
288°
281°
250°
251°
March
310°
019°
309°
282°
311°
April
360°
353°
321°
338°
320°
May
003°
314°
340°
350°
June
021°
264°
302°
264°
July
277°
271°
333°
247°
August
345°
296°
245°
250°
September
069°
286°
251°
252°
October
325°
248°
340°
253°
November
241°
267°
256°
237°
December
249°
211°
243°
251°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.