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
78.7
77
79
78
96
79
February
72.5
82
56
64
79
88
March
89.3
88
92
82
86
83
April
94.1
82
96
99
90
May
98.2
96
99
99
99
June
97.9
96
94
100
99
July
94.1
88
97
98
97
August
93.6
92
89
95
98
September
96.0
97
93
96
97
October
92.6
92
92
94
89
November
79.0
64
91
78
79
December
79.1
68
72
75
82
Average
89.8
82.9
85.3
89.4
93.0
91.6
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
-5.2
-7
-2
-3
-2
-10
February
-4.8
-2
-3
1
-6
-3
March
0.5
1
0
4
-3
-1
April
7.3
4
7
7
6
May
13.5
12
15
13
15
June
18.1
16
20
18
17
July
19.8
18
19
19
20
August
18.4
19
16
18
19
September
14.0
13
13
12
14
October
7.3
6
6
6
6
November
-1.0
1
-2
-6
-3
December
-3.0
-5
-7
-5
-2
Average
6.1
-3.3
6.4
7.9
5.9
6.5
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
-11.6
-13
-7
-9
-7
-17
February
-10.9
-9
-9
-5
-12
-10
March
-7.5
-4
-7
-3
-11
-9
April
-1.3
-3
0
-2
-1
May
5.6
5
6
5
6
June
10.1
9
11
10
9
July
12.5
12
12
12
12
August
11.5
11
11
11
12
September
7.5
6
8
6
8
October
1.6
0
1
1
1
November
-6.1
-4
-7
-11
-8
December
-9.7
-11
-13
-11
-8
Average
-1.6
-9.5
0.3
1.5
-1.2
-1.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.9
9
8
20
10
15
February
23.5
10
47
38
17
16
March
9.2
8
7
17
13
15
April
10.2
19
5
6
16
May
7.9
12
1
8
5
June
10.0
23
2
9
13
July
15.4
20
21
13
15
August
19.5
19
35
16
16
September
17.2
18
26
13
21
October
14.6
14
13
16
11
November
18.7
36
13
24
14
December
21.3
24
35
20
23
Average
13.7
8.6
20.0
17.2
12.9
14.2
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
5.2
4
5
7
5
4
February
5.2
7
5
6
5
6
March
5.3
5
6
5
5
5
April
5.4
5
5
6
5
May
6.4
8
6
6
5
June
5.9
6
5
6
6
July
5.0
5
6
5
6
August
5.4
6
6
5
5
September
5.5
5
6
6
6
October
6.0
4
7
6
5
November
5.2
5
5
5
5
December
5.3
6
3
5
6
Average
5.5
5.1
5.5
5.7
5.4
5.4
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
024°
047°
005°
009°
002°
February
061°
003°
172°
010°
016°
March
348°
348°
013°
013°
002°
April
344°
325°
355°
329°
May
159°
243°
212°
244°
June
153°
252°
189°
203°
July
282°
167°
221°
196°
August
165°
154°
195°
169°
September
349°
141°
004°
102°
October
012°
030°
056°
064°
November
086°
028°
009°
008°
December
007°
040°
012°
042°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.