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
96.7
94
93
96
93
99
February
98.2
100
98
94
100
100
March
98.4
100
100
100
98
99
April
93.3
99
90
98
74
May
96.8
97
96
95
100
June
98.2
98
99
100
100
July
97.7
99
100
99
99
August
99.2
100
98
100
100
September
97.9
100
99
98
100
October
97.6
99
100
100
100
November
98.0
100
92
99
100
December
97.0
100
99
92
96
Average
97.4
97.9
98.4
96.8
97.7
96.8
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
19.8
20.6
22.0
20.3
18.6
18.6
February
19.0
21.0
19.8
18.1
20.0
18.5
March
19.8
20.8
20.6
19.8
20.3
18.6
April
20.5
22.1
19.6
20.8
19.3
May
21.4
22.5
20.3
21.8
21.8
June
22.9
24.5
21.3
22.5
22.6
July
24.1
24.3
24.1
23.6
24.3
August
24.1
25.1
23.6
23.3
23.6
September
22.8
23.0
23.3
22.6
22.1
October
22.3
22.6
23.6
22.3
21.8
November
21.2
20.8
22.1
20.1
22.3
December
20.1
22.5
21.0
18.3
18.6
Average
21.4
20.7
22.5
21.4
21.3
21.0
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
5.8
5.9
7.7
6.9
4.4
6.4
February
5.3
4.2
3.7
7.5
4.5
5.7
March
6.3
5.2
7.7
7.7
6.2
6.2
April
7.6
8.5
7.2
7.2
4.7
May
7.6
9.4
7.4
7.9
6.9
June
8.2
9.1
6.7
8.0
7.7
July
9.2
9.3
9.9
9.6
9.8
August
9.2
11.0
8.0
8.6
9.0
September
8.7
9.3
8.1
8.6
8.0
October
8.8
9.0
7.9
9.3
8.4
November
7.5
7.7
7.5
7.5
8.0
December
6.8
7.0
7.2
6.7
8.0
Average
7.3
5.1
8.3
7.7
7.4
7.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
3.1
8
5
4
0
3
February
3.1
0
0
12
1
1
March
1.9
0
0
2
1
5
April
3.1
2
8
1
1
May
1.7
4
1
5
0
June
0.3
1
0
0
0
July
0.6
1
1
1
0
August
1.6
2
4
0
1
September
0.8
1
0
0
0
October
2.1
3
0
2
1
November
2.7
2
10
0
1
December
3.8
0
0
13
11
Average
2.1
2.6
1.7
3.5
1.7
1.9
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
8.4
8
9
9
6
11
February
9.0
7
9
14
8
11
March
8.5
11
11
9
8
8
April
8.2
11
8
9
8
May
7.6
7
8
8
9
June
9.0
11
9
11
9
July
9.6
10
11
12
11
August
9.0
12
10
10
9
September
7.9
9
9
9
9
October
8.0
9
8
8
10
November
8.7
10
10
9
9
December
9.1
10
8
11
10
Average
8.5
8.7
9.7
9.5
9.2
9.3
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
194°
258°
151°
226°
145°
February
226°
155°
122°
179°
135°
March
143°
138°
209°
225°
144°
April
152°
218°
211°
226°
May
225°
188°
223°
170°
June
163°
186°
160°
196°
July
149°
137°
147°
137°
August
153°
176°
200°
203°
September
195°
189°
202°
187°
October
155°
249°
209°
150°
November
139°
146°
143°
156°
December
130°
157°
146°
127°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.