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
91.4
88
85
93
91
95
February
85.9
89
90
90
77
92
March
87.6
88
86
92
88
81
April
90.3
92
97
87
94
May
86.2
89
90
85
89
June
96.0
90
98
97
100
July
93.5
90
94
97
94
August
95.2
100
97
85
99
September
94.3
96
96
99
97
October
92.6
92
99
96
90
November
92.3
97
95
93
98
December
91.4
95
89
96
95
Average
91.1
88.5
91.8
94.4
91.0
93.5
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
4.3
2
0
3
6
7
February
4.8
9
3
4
-1
6
March
10.6
11
7
11
10
11
April
15.7
15
16
15
16
May
19.8
21
20
19
21
June
27.7
23
30
30
31
July
31.0
28
32
32
32
August
29.5
29
31
28
33
September
26.5
26
28
28
26
October
16.4
17
17
19
16
November
11.3
12
7
15
14
December
6.4
8
3
10
7
Average
15.8
7.2
15.7
17.3
17.7
18.3
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
-8.3
-11
-8
-9
-6
-6
February
-9.6
-5
-9
-10
-12
-7
March
-4.4
-4
-6
-5
-3
-3
April
-1.4
-1
-2
-1
-2
May
5.8
7
4
6
7
June
11.2
11
10
12
12
July
14.8
14
15
15
14
August
13.2
13
14
12
14
September
9.3
9
9
10
8
October
0.7
1
2
3
-1
November
-4.6
-4
-8
0
-2
December
-7.5
-5
-9
-7
-6
Average
1.1
-7.6
1.8
1.3
2.5
2.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.7
10
15
9
6
5
February
13.1
8
12
12
25
12
March
8.1
9
11
10
9
7
April
7.9
7
4
7
8
May
8.9
8
7
10
5
June
2.5
6
2
2
4
July
2.2
3
4
1
3
August
1.4
2
0
1
0
September
1.7
1
1
3
2
October
3.7
4
1
5
1
November
4.2
6
4
2
0
December
6.5
3
9
1
5
Average
5.9
9.0
6.2
4.8
5.8
4.2
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
10.6
9
9
12
11
13
February
10.6
10
11
12
10
12
March
11.3
10
12
12
10
11
April
12.1
11
17
11
11
May
9.5
9
11
10
11
June
8.4
7
9
8
10
July
7.8
7
8
8
9
August
8.0
8
8
7
9
September
8.4
8
8
9
9
October
10.6
9
10
11
11
November
10.7
10
11
11
11
December
11.6
12
12
13
12
Average
9.9
9.8
9.3
10.6
9.8
10.5
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
314°
304°
301°
307°
297°
February
291°
294°
299°
289°
302°
March
294°
292°
318°
308°
287°
April
311°
306°
328°
305°
May
154°
292°
138°
150°
June
144°
211°
157°
290°
July
306°
158°
125°
160°
August
290°
191°
254°
208°
September
336°
274°
309°
305°
October
325°
310°
311°
302°
November
308°
312°
297°
283°
December
310°
298°
269°
311°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.