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
79.0
77
67
80
84
79
February
85.5
96
85
87
86
82
March
84.9
88
78
83
95
85
April
89.0
92
86
95
95
May
93.6
96
93
98
98
June
94.5
88
95
97
98
July
95.9
88
98
99
96
August
94.0
92
93
94
94
September
94.9
97
90
97
97
October
89.6
93
98
82
90
November
89.9
90
92
93
93
December
77.6
60
80
77
81
Average
89.4
86.7
86.3
90.0
92.3
91.4
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
-5.8
-3
-2
-8
-4
-2
February
-2.4
2
-2
-3
-4
-2
March
3.1
7
3
3
6
4
April
11.3
14
12
14
10
May
19.5
20
22
20
19
June
24.4
25
24
27
25
July
27.5
27
27
25
30
August
25.5
24
26
28
25
September
21.5
23
20
21
20
October
14.4
16
16
16
13
November
5.1
5
8
6
9
December
-1.0
1
1
1
0
Average
10.9
2.0
12.8
12.6
13.0
12.5
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
-12.4
-9
-8
-19
-10
-9
February
-11.3
-7
-11
-14
-13
-11
March
-6.6
-3
-5
-6
-6
-3
April
1.3
3
1
3
0
May
7.8
7
9
8
7
June
13.3
14
13
15
14
July
16.4
17
16
15
18
August
15.3
14
16
17
15
September
11.1
12
11
12
10
October
5.5
8
4
8
4
November
-3.6
-3
0
-2
0
December
-8.2
-4
-5
-7
-6
Average
1.6
-7.9
3.6
2.6
3.4
3.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
29.6
31
43
19
22
25
February
25.2
11
33
28
26
25
March
22.3
20
30
28
13
21
April
19.2
17
20
12
17
May
11.2
12
10
7
4
June
10.0
9
17
7
4
July
6.0
6
8
7
5
August
6.6
6
12
3
12
September
7.1
3
10
9
9
October
16.1
21
9
16
19
November
17.8
13
11
14
16
December
27.8
37
26
20
27
Average
16.2
20.3
17.7
15.8
11.8
14.2
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
8.6
9
8
8
9
9
February
9.2
8
9
11
8
10
March
10.0
10
10
10
11
9
April
10.2
10
10
10
10
May
8.7
9
8
9
10
June
8.2
8
8
9
8
July
7.5
7
8
7
8
August
7.2
8
7
7
7
September
7.2
6
8
8
8
October
8.3
8
8
8
8
November
9.2
9
9
8
10
December
8.6
8
10
9
9
Average
8.6
9.0
8.2
8.6
8.4
8.6
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
289°
326°
311°
306°
286°
February
267°
322°
276°
280°
266°
March
291°
310°
267°
267°
348°
April
141°
316°
309°
302°
May
313°
175°
285°
280°
June
035°
260°
237°
249°
July
241°
248°
318°
271°
August
285°
256°
245°
286°
September
289°
300°
262°
229°
October
248°
206°
039°
251°
November
245°
247°
259°
238°
December
349°
316°
273°
277°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.