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
64.2
63
54
76
57
59
February
77.3
90
84
50
76
82
March
82.3
89
74
87
80
76
April
84.5
88
84
87
95
May
87.6
100
91
88
84
June
94.0
96
93
97
99
July
94.6
96
93
89
99
August
91.6
91
85
95
98
September
91.5
90
97
94
95
October
86.2
86
99
83
88
November
88.2
98
87
93
87
December
75.8
74
60
91
84
Average
84.6
80.7
86.4
85.4
86.3
87.2
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
-4.1
-4
-5
-4
-1
-4
February
-2.0
6
-2
-2
-8
-2
March
4.7
9
1
5
9
7
April
11.7
13
10
14
14
May
20.3
25
21
20
18
June
27.1
27
27
30
28
July
27.1
27
28
28
27
August
25.7
27
26
27
27
September
23.2
25
24
25
22
October
13.7
15
18
17
11
November
6.2
9
6
8
9
December
0.2
5
-3
2
2
Average
11.5
3.6
13.6
13.6
14.1
12.6
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
-12.4
-11
-11
-16
-8
-11
February
-12.7
-5
-11
-14
-15
-11
March
-4.6
-3
-7
-3
0
-1
April
1.3
2
0
3
1
May
9.2
11
9
9
9
June
16.0
15
15
16
17
July
16.7
14
17
16
19
August
15.2
15
15
16
16
September
12.4
13
11
12
10
October
4.0
5
5
7
2
November
-3.2
-2
-3
-2
-1
December
-8.4
-4
-9
-8
-8
Average
1.9
-7.8
3.3
2.7
3.8
2.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.2
6
10
0
5
10
February
5.7
4
6
0
5
3
March
6.1
7
7
1
3
4
April
7.9
7
10
3
4
May
3.3
0
4
4
0
June
1.1
0
0
0
0
July
0.5
0
0
0
0
August
1.6
3
0
0
0
September
1.3
2
0
0
0
October
3.6
8
1
0
5
November
4.6
5
8
0
3
December
8.3
8
14
0
7
Average
4.3
5.5
4.4
2.4
1.5
2.8
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
10.2
10
10
11
10
9
February
10.8
11
12
12
9
11
March
11.0
12
11
10
11
11
April
12.0
14
14
12
10
May
10.0
11
10
10
10
June
8.3
6
8
7
11
July
5.5
2
6
5
7
August
6.8
7
7
8
8
September
8.4
8
8
8
9
October
9.7
10
10
9
9
November
11.2
11
13
12
11
December
9.4
9
11
11
10
Average
9.5
10.9
8.9
9.7
9.2
9.9
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
280°
305°
278°
294°
290°
February
261°
276°
307°
285°
282°
March
322°
338°
329°
180°
299°
April
293°
267°
306°
314°
May
189°
221°
207°
355°
June
156°
232°
236°
186°
July
286°
257°
192°
186°
August
216°
211°
182°
196°
September
176°
208°
211°
244°
October
297°
254°
212°
265°
November
244°
264°
275°
246°
December
258°
231°
275°
280°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.