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
2025
2024
2023
2022
2021
January
89.8
94
92
82
93
89
February
87.9
85
92
87
84
88
March
94.5
96
93
92
89
96
April
97.4
98
98
98
98
May
97.6
99
98
96
98
98
June
93.0
85
99
98
99
94
July
96.3
98
98
98
91
August
83.4
97
98
98
40
September
92.8
91
99
93
94
October
94.5
95
97
93
98
November
88.5
96
91
84
86
December
87.1
89
91
100
71
Average
92.2
91.8
95.0
94.3
93.9
87.4
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
2025
2024
2023
2022
2021
January
20.1
17.3
20.1
22.0
19.1
20.1
February
23.9
23.8
21.6
25.0
23.3
23.1
March
24.2
24.5
25.0
20.1
25.6
25.0
April
26.4
26.6
22.3
27.1
26.1
May
30.0
29.8
31.1
29.3
29.8
30.3
June
29.5
24.6
32.2
31.0
32.1
31.5
July
31.1
32.7
32.1
32.1
31.1
August
32.1
32.3
33.3
32.2
31.1
September
30.1
31.3
31.3
30.3
30.5
October
28.7
28.3
27.8
27.5
28.8
November
24.6
26.1
23.8
25.0
22.6
December
21.8
21.5
20.6
25.3
24.1
Average
26.7
24.0
27.4
26.6
27.6
27.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
6.2
4.5
8.5
2.5
6.5
4.0
February
10.5
11.5
7.4
8.6
9.3
9.4
March
10.7
10.1
13.8
6.9
12.0
11.8
April
13.8
13.1
11.5
16.0
14.0
May
17.4
18.6
19.6
15.8
18.1
16.6
June
19.2
16.0
21.3
20.8
21.8
20.6
July
22.0
23.3
23.3
21.8
22.8
August
23.1
23.0
23.6
22.6
23.6
September
21.1
22.8
21.1
21.3
21.6
October
17.9
17.8
16.5
14.4
17.8
November
12.9
14.5
12.5
15.5
7.0
December
9.3
9.5
11.8
11.0
5.2
Average
15.1
12.1
16.3
14.6
16.3
14.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
2.9
3
4
1
3
2
February
4.4
4
9
1
5
5
March
1.9
1
3
1
4
2
April
2.2
1
1
2
2
May
2.5
2
2
1
1
1
June
3.6
0
3
3
2
5
July
3.9
3
3
3
4
August
3.9
6
2
2
1
September
5.6
6
2
11
8
October
2.5
6
1
0
2
November
4.4
2
7
8
5
December
4.4
2
8
0
2
Average
3.3
1.7
3.6
2.5
3.5
3.0
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
2025
2024
2023
2022
2021
January
5.1
5
6
5
5
5
February
5.4
5
5
6
5
6
March
5.9
6
6
6
6
6
April
6.1
6
7
7
5
May
5.3
5
5
5
5
7
June
4.4
4
5
6
5
5
July
3.5
3
4
3
4
August
3.8
5
4
4
4
September
4.4
4
4
4
4
October
5.4
6
6
4
5
November
5.1
5
5
6
5
December
4.7
6
6
7
4
Average
4.9
5.0
5.0
5.3
4.8
4.9
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
009°
324°
260°
318°
257°
February
308°
276°
259°
060°
256°
March
263°
264°
258°
246°
267°
April
250°
275°
053°
277°
May
264°
271°
300°
279°
044°
June
238°
305°
265°
278°
224°
July
257°
269°
253°
247°
August
252°
280°
243°
180°
September
070°
037°
029°
328°
October
050°
042°
026°
019°
November
071°
035°
040°
027°
December
046°
007°
083°
254°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.