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
80.8
62
78
80
74
89
February
86.9
68
83
87
88
97
March
80.4
79
94
80
24
94
April
89.6
80
79
93
92
May
94.4
91
85
95
99
June
93.0
87
89
95
89
July
95.5
92
97
86
99
August
93.7
87
90
88
97
September
92.9
79
91
99
99
October
91.9
80
96
94
98
November
85.4
87
74
91
79
December
87.1
95
62
86
86
Average
88.3
69.9
86.0
84.9
85.1
93.8
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
-9.4
-9
-8
-11
-4
-9
February
-9.0
-4
-7
-12
-13
-5
March
-2.9
-3
-5
-2
4
1
April
7.7
7
3
11
1
May
19.3
23
16
18
19
June
24.6
26
23
27
24
July
26.3
24
26
28
27
August
25.1
25
26
24
26
September
19.9
23
22
23
19
October
9.9
10
12
15
7
November
-1.4
2
-1
3
2
December
-6.3
0
-11
-10
1
Average
7.3
-6.9
9.9
8.2
10.6
9.5
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
-17.6
-16
-16
-21
-9
-16
February
-19.4
-11
-19
-24
-22
-16
March
-12.4
-13
-17
-11
-7
-10
April
-4.2
-4
-4
-2
-9
May
4.9
7
6
3
5
June
11.8
13
11
13
12
July
13.7
11
15
15
15
August
12.0
13
14
12
12
September
7.6
10
8
9
6
October
0.5
2
2
2
-2
November
-9.4
-5
-8
-7
-9
December
-15.6
-10
-18
-18
-9
Average
-4.6
-14.4
-2.7
-2.1
-1.3
-2.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
29.1
52
42
48
10
16
February
20.3
29
29
30
16
15
March
15.9
30
16
27
6
12
April
12.9
21
28
10
15
May
7.7
6
21
9
4
June
6.5
6
14
8
4
July
4.4
6
9
2
5
August
5.8
14
6
10
3
September
5.9
14
6
1
3
October
11.9
25
13
6
10
November
25.4
20
57
14
16
December
17.8
9
42
21
15
Average
14.4
36.6
16.9
23.8
8.8
8.7
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
9.1
11
8
10
8
9
February
9.4
9
10
8
10
10
March
9.0
11
7
10
9
10
April
10.5
11
12
10
11
May
9.9
9
11
10
10
June
9.2
7
10
10
11
July
8.0
8
8
7
8
August
7.8
7
7
9
8
September
8.9
7
8
11
10
October
10.1
9
11
9
12
November
9.1
11
10
9
8
December
9.4
9
10
11
9
Average
9.2
10.0
8.4
9.6
9.4
9.4
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
292°
281°
291°
267°
261°
February
336°
276°
296°
282°
270°
March
314°
311°
298°
270°
288°
April
028°
019°
339°
308°
May
036°
018°
314°
045°
June
275°
344°
286°
239°
July
307°
306°
268°
262°
August
298°
291°
300°
275°
September
295°
297°
273°
290°
October
331°
299°
302°
284°
November
270°
309°
269°
263°
December
267°
336°
278°
267°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.