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
65.0
63
46
88
67
56
February
82.8
92
84
90
76
91
March
84.9
93
82
85
88
76
April
88.5
90
90
88
93
91
May
91.1
95
94
91
89
June
95.3
92
97
98
98
July
95.1
98
97
90
99
August
93.9
94
91
95
100
September
92.6
92
95
94
97
October
88.8
85
100
89
91
November
87.4
98
81
96
88
December
76.7
72
65
86
82
Average
86.9
85.4
86.6
90.7
89.2
89.0
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
-4.4
-4
-4
-5
-2
-3
February
-3.3
7
-1
-4
-9
-2
March
5.4
10
3
6
10
6
April
11.7
15
14
9
15
13
May
20.7
24
22
20
20
June
27.3
28
28
30
28
July
27.2
27
28
27
28
August
26.2
28
26
27
27
September
23.5
25
23
25
21
October
14.2
16
16
18
11
November
5.8
9
6
7
9
December
1.0
5
-1
2
1
Average
12.3
6.6
14.5
13.3
14.3
13.1
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
-12.7
-10
-10
-17
-9
-10
February
-13.9
-5
-11
-15
-16
-11
March
-3.1
-2
-5
-3
0
-1
April
1.6
4
3
1
4
1
May
10.0
11
10
10
9
June
16.3
15
16
17
17
July
16.5
15
18
17
18
August
15.7
18
16
17
16
September
12.9
14
12
12
11
October
4.4
5
4
8
2
November
-3.1
-1
-3
-2
-1
December
-7.2
-3
-8
-7
-8
Average
2.9
-4.7
4.3
2.9
4.2
3.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.0
12
16
6
6
19
February
9.1
1
14
7
7
8
March
7.4
5
12
6
8
8
April
12.0
12
11
16
4
9
May
8.8
5
8
11
8
June
5.2
5
8
3
5
July
2.3
2
1
4
1
August
3.7
6
3
4
1
September
5.0
3
4
2
8
October
8.2
11
2
8
8
November
8.4
5
17
2
4
December
9.5
8
22
7
4
Average
7.8
7.6
7.8
7.3
5.4
6.5
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
7.1
7
6
8
7
8
February
7.5
8
7
9
7
7
March
8.6
9
8
9
9
8
April
9.4
11
10
11
9
8
May
7.9
8
9
8
8
June
6.8
6
8
6
8
July
5.2
5
6
4
5
August
5.7
6
5
6
6
September
6.5
6
6
6
7
October
7.5
7
7
7
8
November
8.4
8
9
9
8
December
7.5
8
8
8
7
Average
7.5
8.8
6.9
7.9
7.0
7.3
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
271°
284°
245°
296°
252°
February
240°
206°
289°
278°
269°
March
321°
340°
344°
162°
214°
April
263°
265°
198°
283°
305°
May
138°
165°
154°
058°
June
152°
211°
220°
157°
July
249°
198°
183°
180°
August
210°
180°
172°
188°
September
169°
182°
180°
233°
October
292°
240°
150°
274°
November
232°
243°
246°
224°
December
199°
167°
212°
252°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.