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
73.7
66
57
87
79
73
February
84.3
90
85
85
83
92
March
89.3
89
81
98
91
99
April
89.5
95
88
89
90
100
May
95.6
96
95
98
85
June
97.8
97
100
99
99
July
96.8
98
99
92
98
August
94.5
95
94
97
94
September
94.7
94
97
99
98
October
92.0
91
99
93
94
November
91.2
99
87
94
96
December
78.2
74
61
89
87
Average
90.4
86.1
88.9
92.7
91.9
92.9
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
-6.2
-5
-5
-8
-3
-6
February
-5.4
4
-3
-5
-9
-3
March
3.6
7
-1
3
9
9
April
10.7
15
10
8
13
13
May
21.6
25
20
21
16
June
27.7
28
28
30
28
July
28.2
28
29
29
29
August
26.8
29
27
27
27
September
23.2
25
25
23
21
October
12.6
15
16
14
10
November
4.2
8
4
4
8
December
-2.5
4
-4
-5
0
Average
9.1
5.1
13.3
12.4
13.3
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
-16.9
-13
-15
-22
-11
-14
February
-16.6
-7
-16
-19
-18
-13
March
-7.4
-6
-13
-6
-2
0
April
-1.5
2
-2
-1
1
13
May
8.6
9
9
7
11
June
15.4
16
15
15
16
July
16.1
14
16
17
17
August
15.2
14
15
16
17
September
11.2
12
10
13
9
October
2.3
3
2
7
0
November
-6.8
-5
-6
-2
-4
December
-10.2
-5
-12
-11
-11
Average
-1.0
-7.9
1.0
0.6
2.8
1.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.9
10
27
11
9
13
February
10.8
3
12
13
8
7
March
10.5
12
16
4
11
18
April
14.5
14
14
16
15
0
May
6.7
4
5
6
13
June
4.6
4
3
3
5
July
4.0
2
4
4
3
August
2.7
2
4
1
1
September
4.4
4
3
5
4
October
7.9
7
5
3
8
November
9.4
6
14
8
3
December
11.6
17
24
18
8
Average
7.7
10.0
8.9
7.5
7.5
6.0
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
8.5
8
7
9
8
9
February
9.5
9
9
12
8
10
March
9.6
10
10
10
10
7
April
11.0
12
11
14
10
16
May
8.5
9
9
9
8
June
7.6
6
9
7
9
July
6.2
6
7
5
6
August
6.5
7
7
7
6
September
7.4
7
7
8
7
October
9.1
9
9
8
9
November
9.7
10
11
7
10
December
8.6
8
10
9
9
Average
8.8
10.1
8.1
9.5
8.0
8.2
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
297°
352°
343°
357°
344°
February
288°
005°
339°
318°
325°
March
333°
022°
005°
210°
028°
April
329°
009°
345°
007°
352°
May
158°
262°
248°
280°
June
144°
273°
273°
178°
July
329°
293°
198°
221°
August
134°
192°
202°
215°
September
146°
214°
218°
306°
October
302°
297°
285°
322°
November
278°
324°
199°
290°
December
280°
106°
297°
344°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.