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
78.7
83
61
76
83
75
February
91.8
93
90
89
91
93
March
89.5
91
90
89
95
91
April
93.9
97
91
97
96
May
96.4
90
96
98
97
June
93.8
85
93
98
95
July
94.4
88
98
92
98
August
93.8
90
95
99
99
September
94.7
85
96
99
99
October
95.5
97
95
98
95
November
83.6
86
80
89
80
December
87.4
97
72
82
88
Average
91.4
89.0
88.1
90.6
94.0
93.1
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
-9.6
-11
-7
-9
-6
-11
February
-8.4
-2
-6
-8
-12
-4
March
0.4
-1
-2
1
6
-2
April
8.6
10
7
12
7
May
19.0
24
16
18
17
June
22.4
25
22
26
21
July
24.5
24
25
26
24
August
23.4
23
26
24
24
September
17.8
20
21
20
17
October
9.5
11
15
11
5
November
-2.1
2
-4
0
-2
December
-7.0
-1
-13
-14
-3
Average
6.9
-5.5
10.2
9.0
9.3
7.8
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
-17.0
-20
-15
-20
-15
-18
February
-19.7
-13
-17
-20
-22
-15
March
-12.7
-13
-15
-10
-8
-13
April
-4.8
-2
-3
-3
-6
May
5.1
7
4
3
5
June
10.6
11
10
12
10
July
12.6
11
13
14
13
August
11.2
11
13
12
11
September
5.9
6
7
7
6
October
-1.1
-1
2
0
-3
November
-10.8
-6
-11
-9
-9
December
-16.6
-12
-21
-22
-12
Average
-4.0
-16.7
-2.2
-3.6
-3.6
-3.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
21.6
17
15
27
24
23
February
22.0
19
21
26
20
18
March
16.9
16
23
20
6
22
April
10.9
10
16
8
10
May
7.4
3
11
7
8
June
11.5
8
15
5
20
July
6.4
8
6
4
9
August
7.2
12
8
7
8
September
10.2
6
10
6
9
October
9.3
12
3
2
13
November
23.4
16
33
22
18
December
19.3
2
40
25
23
Average
13.5
17.2
11.0
15.6
10.0
14.3
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
5.4
5
4
6
5
6
February
6.4
7
6
7
7
7
March
6.9
8
6
8
7
8
April
7.9
8
9
8
9
May
7.5
7
8
8
8
June
7.0
6
7
7
8
July
6.5
6
7
7
7
August
6.6
7
6
7
8
September
7.0
6
7
8
8
October
7.5
9
7
8
8
November
6.5
7
7
6
6
December
5.5
5
6
6
5
Average
6.8
6.8
6.4
7.0
6.9
7.3
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
331°
278°
321°
292°
276°
February
283°
260°
308°
272°
278°
March
080°
129°
328°
280°
319°
April
147°
057°
317°
288°
May
105°
010°
085°
058°
June
057°
041°
268°
010°
July
316°
270°
263°
263°
August
275°
274°
279°
256°
September
212°
267°
259°
284°
October
238°
264°
180°
287°
November
238°
323°
285°
289°
December
211°
317°
270°
256°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.