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
68.6
53
52
81
71
63
February
81.1
78
80
71
80
95
March
84.9
82
71
87
93
86
April
83.0
84
73
67
80
97
May
92.7
90
91
95
95
June
95.6
90
97
98
98
July
95.6
96
92
91
99
August
93.0
95
92
94
96
September
90.3
89
90
96
97
October
86.8
82
97
83
90
November
84.9
94
74
94
90
December
70.9
53
56
78
78
Average
85.6
74.7
81.1
84.4
88.6
91.2
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
-6.0
-6
-6
-9
-3
-6
February
-5.8
4
-4
-7
-10
-4
March
3.0
6
-2
1
8
4
April
10.5
14
8
6
12
11
May
20.7
24
19
21
18
June
27.1
28
27
29
27
July
27.8
27
27
29
28
August
26.1
27
26
28
26
September
22.4
24
23
24
20
October
12.5
14
15
16
9
November
3.4
6
2
5
7
December
-2.1
3
-4
-3
-1
Average
10.8
4.1
12.5
11.2
13.0
11.5
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
-15.9
-12
-13
-20
-10
-14
February
-15.9
-6
-14
-19
-18
-14
March
-6.2
-5
-10
-7
-2
-4
April
0.7
3
-1
-1
2
-1
May
9.1
10
9
8
8
June
15.8
16
16
17
16
July
17.3
16
17
18
18
August
16.2
16
16
17
16
September
12.0
14
12
12
10
October
3.7
5
4
7
1
November
-5.6
-3
-5
-3
-3
December
-10.1
-4
-11
-12
-10
Average
1.3
-6.9
2.7
1.4
2.9
2.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.8
10
12
9
8
8
February
8.5
4
12
19
5
2
March
9.3
18
24
4
7
3
April
12.5
14
20
27
11
4
May
3.6
2
3
2
4
June
1.8
3
1
3
2
July
2.9
2
3
2
2
August
2.3
1
2
2
1
September
3.6
3
2
6
2
October
5.6
6
2
5
8
November
5.9
2
16
2
2
December
11.3
20
19
12
8
Average
6.5
11.7
8.7
8.2
5.0
3.5
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
9.2
9
8
10
9
9
February
10.1
10
10
13
9
10
March
10.7
12
11
11
11
10
April
11.4
12
12
14
11
10
May
10.1
10
11
10
10
June
9.5
8
11
9
11
July
8.0
8
9
8
8
August
8.4
9
9
10
8
September
9.2
8
9
10
9
October
10.3
10
10
9
10
November
10.5
11
10
10
11
December
9.3
9
11
9
9
Average
9.8
10.8
9.5
10.7
9.5
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
281°
313°
284°
304°
278°
February
274°
273°
301°
262°
277°
March
346°
038°
328°
161°
277°
April
007°
322°
288°
338°
304°
May
127°
205°
193°
042°
June
115°
235°
251°
151°
July
292°
247°
170°
220°
August
183°
166°
192°
174°
September
135°
188°
216°
263°
October
308°
259°
151°
273°
November
259°
289°
266°
240°
December
256°
100°
257°
282°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.