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
77.0
74
62
81
85
78
February
87.6
71
84
89
86
97
March
90.2
91
98
78
96
92
April
92.0
89
88
97
91
May
89.7
80
84
95
96
June
92.9
95
99
93
82
July
95.5
96
97
87
98
August
93.8
88
98
88
95
September
92.5
84
94
98
97
October
86.5
87
89
85
93
November
80.4
77
70
83
83
December
81.3
80
70
78
90
Average
88.2
78.6
85.4
87.0
89.9
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
-12.2
-11
-11
-17
-8
-11
February
-11.1
-5
-10
-15
-14
-8
March
-3.3
-3
-6
-4
1
-3
April
5.1
6
3
8
2
May
15.8
21
14
14
15
June
21.5
26
20
23
19
July
24.7
23
25
27
25
August
23.1
23
25
22
24
September
17.1
20
20
19
16
October
7.3
8
10
11
4
November
-5.8
0
-4
-1
-5
December
-9.5
-2
-14
-16
-7
Average
4.8
-7.3
8.1
6.0
7.3
5.8
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
-20.0
-18
-17
-25
-17
-18
February
-22.3
-15
-22
-26
-26
-19
March
-15.3
-15
-20
-15
-11
-16
April
-6.3
-5
-6
-3
-9
May
3.5
7
4
2
2
June
11.0
14
10
12
10
July
13.9
13
14
15
15
August
12.7
13
14
13
13
September
7.4
10
8
9
6
October
-1.9
1
1
3
-2
November
-11.2
-7
-11
-8
-13
December
-19.8
-11
-21
-24
-17
Average
-6.9
-16.1
-2.0
-4.2
-3.2
-4.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
36.5
43
38
48
30
24
February
23.7
32
31
25
20
19
March
18.0
24
11
34
7
19
April
12.0
15
24
6
14
May
11.7
10
21
8
6
June
11.6
6
16
5
21
July
6.2
14
6
2
6
August
6.2
10
10
6
7
September
6.7
3
10
3
6
October
15.6
16
15
9
24
November
38.3
40
55
19
31
December
27.0
13
40
36
18
Average
17.8
32.7
16.7
24.3
10.7
15.2
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
7.8
9
6
9
8
7
February
8.3
8
9
8
9
8
March
8.6
8
8
9
10
8
April
8.7
8
9
9
9
May
8.1
7
9
8
9
June
8.3
8
9
9
8
July
7.5
8
7
4
8
August
6.1
7
8
0
2
September
8.1
9
9
3
10
October
9.8
8
11
9
11
November
8.9
10
10
8
8
December
7.5
8
7
8
8
Average
8.1
8.4
8.0
8.8
6.8
7.9
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
294°
247°
302°
226°
203°
February
323°
274°
285°
273°
251°
March
316°
251°
302°
148°
304°
April
095°
029°
309°
294°
May
085°
358°
053°
122°
June
150°
344°
263°
077°
July
298°
287°
173°
209°
August
273°
259°
360°
258°
September
183°
230°
209°
277°
October
287°
295°
184°
278°
November
266°
337°
237°
214°
December
244°
330°
279°
252°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.