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
70.1
54
62
89
69
65
February
85.3
94
83
91
80
92
March
84.9
83
83
86
77
April
91.8
95
89
98
93
May
91.3
98
91
93
92
June
93.7
85
96
96
94
July
96.0
94
95
97
95
August
94.2
94
93
96
99
September
92.3
93
93
97
87
October
90.2
87
96
88
94
November
89.1
96
82
98
88
December
80.9
72
64
88
86
Average
87.1
72.6
87.4
89.6
91.1
88.9
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
-2.2
-3
0
-4
-2
-1
February
1.7
10
4
0
-7
1
March
8.1
8
8
10
10
April
15.1
17
12
16
15
May
22.0
25
23
20
19
June
27.9
29
28
29
28
July
28.7
29
29
28
29
August
27.5
29
28
29
28
September
25.2
27
25
26
23
October
16.4
18
18
18
14
November
8.2
10
9
9
12
December
3.5
6
3
6
2
Average
13.8
3.6
16.8
15.2
15.3
14.9
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
-10.5
-8
-6
-16
-9
-8
February
-9.4
-3
-7
-12
-15
-8
March
-2.3
-2
-2
1
0
April
3.0
4
1
5
2
May
10.5
11
12
10
9
June
16.1
16
15
17
17
July
17.6
17
18
18
17
August
16.0
17
16
17
15
September
12.8
14
12
13
11
October
5.5
7
4
9
3
November
-3.9
-1
-1
-2
0
December
-6.6
-1
-5
-5
-7
Average
3.2
-6.0
5.7
3.7
4.9
4.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.8
20
11
8
6
9
February
8.1
0
16
8
9
4
March
7.9
7
11
8
9
April
7.8
2
14
3
6
May
6.4
2
11
8
6
June
3.5
1
5
6
7
July
1.8
2
3
2
2
August
2.5
2
4
3
0
September
4.1
1
3
2
9
October
6.9
7
4
12
4
November
5.9
4
16
4
5
December
9.3
18
18
3
7
Average
6.6
10.8
5.5
8.1
5.5
5.4
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
10.4
10
10
12
10
11
February
11.0
11
11
13
10
10
March
11.6
11
12
12
11
April
12.5
14
14
12
12
May
10.1
10
11
10
10
June
8.7
8
9
8
9
July
7.1
7
8
7
7
August
7.0
7
7
7
7
September
8.4
7
9
9
10
October
10.3
11
10
10
11
November
10.9
10
12
12
12
December
10.1
10
12
11
9
Average
9.8
10.3
9.6
10.5
9.6
9.7
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
298°
287°
292°
347°
282°
February
264°
276°
299°
310°
311°
March
312°
319°
150°
260°
April
258°
259°
271°
293°
May
110°
144°
162°
032°
June
088°
217°
211°
170°
July
280°
225°
164°
183°
August
219°
195°
180°
221°
September
162°
291°
214°
242°
October
295°
263°
020°
286°
November
257°
258°
257°
223°
December
213°
195°
229°
282°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.