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
96.4
92
98
91
98
97
February
92.8
96
92
95
87
97
March
98.1
99
95
99
99
98
April
96.7
95
89
99
100
May
99.2
100
98
99
99
June
98.7
100
98
96
100
July
99.8
100
100
100
100
August
98.5
99
99
99
100
September
94.7
100
98
99
75
October
97.9
96
99
99
97
November
86.4
97
95
95
95
December
95.9
99
97
95
93
Average
96.2
95.7
97.5
96.5
97.2
96.0
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
4.3
4
4
2
5
5
February
5.1
8
5
5
4
7
March
10.1
12
7
11
11
11
April
15.0
14
12
18
17
May
20.6
23
17
21
21
June
25.4
26
24
30
23
July
31.6
33
33
35
30
August
31.1
31
34
30
31
September
25.3
25
28
26
27
October
16.6
19
19
17
18
November
7.8
9
5
10
9
December
3.6
6
1
4
5
Average
15.0
7.9
17.0
16.3
17.6
17.0
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
-2.4
-2
-3
-4
-1
0
February
-3.2
0
-3
-4
-3
-2
March
-2.7
-1
-2
1
-1
-2
April
1.7
1
0
1
2
May
6.1
7
5
5
6
June
9.4
10
9
11
9
July
11.6
13
12
14
10
August
11.8
13
13
12
11
September
7.1
8
8
7
6
October
2.7
4
2
5
2
November
0.0
1
-3
3
0
December
-3.9
1
-4
-2
-3
Average
2.8
-2.7
4.2
3.1
4.2
3.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
16.1
32
13
17
11
21
February
22.5
20
18
18
40
14
March
11.3
8
23
12
8
5
April
14.8
17
23
7
5
May
9.2
5
16
5
11
June
7.3
5
11
1
13
July
0.0
0
0
0
0
August
1.9
6
1
2
1
September
4.4
9
3
6
1
October
8.9
5
10
11
6
November
11.3
10
18
14
13
December
16.5
17
24
23
20
Average
10.9
19.2
10.4
11.9
9.6
8.7
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
11.4
12
11
12
11
12
February
9.7
9
11
11
9
10
March
8.4
8
10
9
10
7
April
8.8
10
9
9
8
May
7.2
6
8
8
6
June
6.4
6
6
7
6
July
5.6
6
6
6
5
August
5.3
5
5
5
5
September
5.4
6
5
6
4
October
7.5
8
5
9
6
November
9.0
10
10
11
12
December
11.3
14
13
11
10
Average
8.1
9.3
8.3
7.9
8.4
7.4
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
182°
177°
178°
175°
179°
February
189°
187°
208°
251°
222°
March
235°
172°
271°
219°
275°
April
199°
263°
317°
305°
May
312°
297°
316°
316°
June
323°
312°
321°
320°
July
334°
324°
334°
333°
August
321°
326°
319°
318°
September
308°
309°
269°
314°
October
229°
191°
202°
284°
November
194°
206°
176°
182°
December
170°
185°
186°
175°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.