Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km 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
94.3
94
89
99
99
96
February
95.7
94
99
94
93
March
96.7
97
96
96
99
April
96.4
96
97
96
98
May
98.1
100
99
97
97
June
98.6
99
99
99
100
July
96.1
99
99
96
100
August
97.3
100
98
99
99
September
97.0
98
97
97
99
October
96.9
98
96
99
99
November
95.0
94
91
95
99
December
94.3
94
94
96
98
Average
96.1
94.1
96.4
96.9
96.7
98.1
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km 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
26.2
26.6
25.3
26.1
26.5
25.3
February
26.3
26.6
27.1
24.6
25.3
March
25.9
27.1
25.8
26.1
25.3
April
25.1
25.3
25.0
25.3
25.1
May
25.8
26.8
26.1
25.3
25.1
June
25.9
27.1
26.6
25.3
25.6
July
26.4
28.0
27.3
26.1
26.1
August
27.2
27.8
28.6
26.1
27.3
September
27.1
28.6
27.1
26.3
26.8
October
26.4
26.8
26.0
27.1
26.8
November
25.2
25.3
24.6
24.8
26.3
December
25.4
26.1
25.8
24.6
25.1
Average
26.1
26.6
26.7
26.3
25.7
25.9
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
16.0
17.1
17.3
16.3
17.1
17.1
February
15.9
17.6
16.8
16.8
16.8
March
15.5
18.0
16.8
16.1
16.5
April
16.9
17.5
17.0
17.1
17.0
May
16.7
18.6
18.1
17.3
17.3
June
15.7
17.1
17.8
16.3
17.1
July
15.2
17.6
16.8
16.3
17.3
August
15.9
17.6
17.6
17.3
16.6
September
16.2
18.1
17.6
16.8
17.1
October
16.5
17.0
17.1
17.0
17.1
November
16.2
16.8
17.1
16.6
16.8
December
15.3
17.0
16.8
16.3
17.1
Average
16.1
17.1
17.5
17.2
16.7
17.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
2.6
3
3
2
2
3
February
3.5
5
1
7
4
March
5.9
5
6
6
7
April
7.7
8
6
9
7
May
3.7
1
2
2
5
June
0.8
0
0
0
1
July
0.4
0
0
1
1
August
1.0
1
0
1
1
September
3.6
3
4
4
6
October
4.3
2
7
5
6
November
6.5
4
15
5
3
December
4.7
5
7
5
7
Average
3.6
2.6
3.0
4.2
3.7
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
2025
2024
2023
2022
2021
January
5.2
6
5
6
5
5
February
5.2
5
5
5
5
March
5.0
6
5
5
5
April
4.7
5
5
5
5
May
4.9
5
5
5
5
June
5.1
6
6
5
5
July
5.7
5
6
6
6
August
5.9
6
7
5
6
September
5.7
7
6
5
6
October
5.4
6
6
5
5
November
5.2
6
5
5
5
December
5.1
6
5
5
5
Average
5.3
5.9
5.7
5.7
5.2
5.2
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
091°
090°
072°
059°
071°
February
099°
118°
121°
114°
March
149°
083°
109°
116°
April
160°
147°
142°
138°
May
168°
162°
152°
158°
June
168°
165°
165°
163°
July
166°
166°
162°
163°
August
158°
157°
146°
155°
September
146°
125°
144°
118°
October
131°
104°
080°
107°
November
107°
104°
070°
066°
December
061°
094°
081°
116°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.