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
84.8
81
71
83
92
88
February
87.9
92
82
81
86
95
March
90.7
91
89
90
97
86
April
94.0
96
84
98
98
May
93.9
78
93
100
95
June
96.7
88
96
100
97
July
94.0
81
95
93
99
August
94.4
92
99
96
100
September
95.7
84
99
98
98
October
94.4
94
96
86
94
November
85.1
82
84
90
87
December
91.3
94
82
88
92
Average
92.1
88.0
86.0
90.7
94.3
94.6
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
-5.0
-11
-3
-3
-2
-9
February
-5.1
0
-3
-1
-9
-1
March
1.1
4
-2
5
4
-2
April
8.6
11
6
11
9
May
18.4
24
14
17
17
June
21.6
24
21
24
19
July
23.3
25
25
25
22
August
23.5
25
27
24
22
September
17.7
20
22
18
18
October
10.0
11
15
8
7
November
0.2
4
-2
3
0
December
-4.1
3
-10
-12
-2
Average
7.8
-3.6
11.7
10.4
9.3
8.0
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
-15.8
-18
-12
-15
-11
-20
February
-16.1
-13
-12
-12
-21
-11
March
-11.4
-9
-15
-6
-7
-14
April
-3.1
-1
-4
-3
-4
May
4.5
6
2
4
4
June
8.6
9
8
10
9
July
10.5
10
12
11
11
August
9.7
10
11
10
10
September
4.9
6
6
6
6
October
-1.4
0
2
-1
-3
November
-9.0
-4
-11
-7
-10
December
-14.5
-8
-22
-20
-10
Average
-4.3
-14.9
-1.0
-2.2
-3.6
-4.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
23.3
25
18
37
18
20
February
23.0
15
39
35
19
10
March
18.1
12
32
17
11
21
April
13.6
18
31
8
5
May
12.3
8
27
9
16
June
9.3
7
14
6
12
July
7.5
11
5
4
11
August
5.5
5
4
7
7
September
5.9
4
5
8
4
October
9.3
12
8
7
17
November
21.3
10
37
13
19
December
16.9
10
44
24
11
Average
13.4
17.1
13.9
20.4
10.2
12.3
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
6.5
6
6
8
8
6
February
6.9
6
8
8
7
8
March
6.5
7
5
8
8
8
April
8.0
8
8
8
9
May
7.6
6
9
8
8
June
7.8
7
7
8
9
July
7.1
6
8
7
8
August
7.7
7
8
9
8
September
7.7
8
8
9
8
October
8.1
7
9
9
8
November
6.5
7
7
8
7
December
6.3
6
8
6
6
Average
7.2
6.4
6.7
7.8
8.0
7.7
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
294°
270°
273°
254°
257°
February
300°
281°
280°
270°
257°
March
286°
321°
281°
255°
294°
April
246°
325°
277°
267°
May
270°
287°
268°
293°
June
269°
284°
265°
266°
July
269°
249°
274°
266°
August
270°
254°
256°
245°
September
240°
254°
249°
264°
October
260°
248°
242°
278°
November
258°
299°
236°
246°
December
218°
303°
274°
250°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.