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
88.8
87
82
88
95
91
February
86.1
83
93
87
91
83
March
93.1
93
90
97
99
April
95.7
95
96
100
96
May
96.0
95
97
95
92
June
97.4
95
95
100
97
July
99.6
99
100
100
100
August
99.0
100
100
97
99
September
96.7
98
99
99
99
October
93.7
100
93
96
97
November
90.9
90
91
82
95
December
89.2
82
92
87
92
Average
93.2
84.8
93.7
94.1
95.1
95.4
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
14.5
11.5
11.8
17.3
15.0
14.5
February
16.8
16.3
20.6
17.6
15.0
11.5
March
22.3
22.1
21.8
22.1
22.8
April
25.1
26.0
23.6
26.3
23.8
May
29.5
30.1
29.0
30.8
27.0
June
33.7
33.7
33.7
35.1
32.5
July
35.9
34.7
37.1
38.6
34.0
August
35.9
37.0
39.6
35.3
34.1
September
32.4
32.2
34.3
32.2
33.3
October
26.9
30.3
26.1
26.8
28.0
November
20.2
22.3
19.3
17.6
20.1
December
17.1
17.5
17.3
16.6
21.8
Average
24.6
13.8
26.5
26.4
26.3
25.4
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
3.9
1.5
1.3
6.5
1.1
4.9
February
6.0
5.0
9.4
6.4
1.1
1.9
March
11.6
12.4
11.6
8.6
11.8
April
14.4
15.9
13.9
15.8
14.0
May
20.0
21.0
19.8
20.1
18.8
June
24.1
24.6
23.8
25.3
23.6
July
26.1
25.1
26.6
27.6
25.3
August
26.1
26.6
28.5
25.8
25.1
September
22.4
21.3
24.0
21.8
22.3
October
15.8
18.3
16.1
14.5
16.8
November
9.5
11.3
9.9
8.8
8.6
December
7.2
8.1
6.5
9.3
11.1
Average
14.3
3.1
16.3
16.2
15.2
15.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
6.7
10
7
7
3
10
February
9.5
7
6
12
13
8
March
5.0
7
5
4
3
April
3.7
5
3
1
6
May
4.9
5
5
3
11
June
1.9
2
1
0
3
July
1.3
2
1
0
1
August
2.3
0
0
5
3
September
3.3
5
2
2
1
October
6.2
0
6
8
3
November
6.6
7
7
13
4
December
7.8
8
9
6
2
Average
5.1
8.4
4.2
4.5
4.6
4.4
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
8.5
8
8
9
8
8
February
9.0
8
9
9
9
9
March
9.5
9
9
10
10
April
10.0
9
9
11
9
May
8.7
8
7
10
8
June
8.0
7
7
8
7
July
7.1
7
7
7
6
August
6.9
6
7
7
7
September
6.7
6
7
6
6
October
7.9
7
8
7
8
November
7.6
7
7
7
7
December
7.6
7
7
7
8
Average
8.1
8.0
7.5
7.7
8.2
7.7
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
318°
309°
281°
314°
313°
February
004°
226°
254°
313°
339°
March
168°
194°
220°
169°
April
169°
119°
165°
145°
May
149°
145°
169°
139°
June
148°
142°
151°
162°
July
171°
175°
169°
164°
August
149°
155°
151°
159°
September
046°
148°
139°
133°
October
142°
129°
167°
203°
November
162°
168°
149°
168°
December
162°
215°
233°
185°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.