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
91.1
93
90
84
92
90
February
93.3
95
93
96
86
98
March
94.2
93
98
92
93
93
April
97.9
100
98
98
98
May
98.5
100
94
100
100
June
98.7
100
96
98
100
July
99.8
100
100
100
100
August
99.4
100
99
99
99
September
99.4
100
99
99
100
October
96.8
100
99
96
97
November
93.7
91
98
94
89
December
89.4
92
94
75
96
Average
96.1
93.6
97.4
95.8
95.4
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 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
13.2
15.5
14.1
15.6
11.0
13.5
February
15.2
12.8
17.5
14.0
14.4
16.8
March
18.0
21.1
19.6
18.1
13.3
16.3
April
23.3
26.8
21.1
23.8
22.5
May
28.6
28.8
26.8
29.3
30.6
June
33.0
38.2
31.3
33.1
32.5
July
36.3
37.8
37.3
35.8
37.2
August
35.6
36.8
35.0
34.1
37.2
September
32.0
32.0
33.2
31.8
31.3
October
27.2
27.8
28.3
27.3
25.8
November
20.7
20.1
21.3
21.3
21.6
December
15.1
15.3
16.8
17.0
14.0
Average
23.8
16.6
26.3
25.0
24.6
24.7
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
4.4
5.7
3.7
4.0
3.2
6.5
February
4.8
1.5
4.2
1.9
4.9
6.0
March
6.4
5.7
6.5
5.7
2.9
5.0
April
10.4
10.8
8.1
9.8
9.6
May
15.2
13.6
12.3
14.4
17.5
June
18.8
20.8
18.1
18.0
17.3
July
20.9
22.6
19.6
20.1
21.6
August
20.6
20.3
20.0
20.8
20.3
September
16.9
16.8
17.1
15.9
16.1
October
12.9
11.5
13.1
12.8
11.5
November
9.2
6.0
11.0
9.1
11.0
December
6.6
5.5
7.5
6.5
7.2
Average
11.4
4.4
11.9
11.6
11.7
12.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
12.3
15
12
7
15
15
February
5.7
9
1
3
16
2
March
7.1
4
6
12
12
8
April
4.8
2
10
6
4
May
2.5
2
9
2
1
June
1.0
0
3
1
1
July
0.0
0
0
0
0
August
0.1
0
0
1
0
September
0.3
1
1
0
1
October
1.5
0
2
1
2
November
6.5
6
13
11
2
December
10.3
19
7
14
11
Average
4.3
9.0
3.5
5.3
5.5
3.5
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
6.9
7
6
6
8
7
February
6.8
7
6
8
6
7
March
6.9
7
6
7
8
7
April
6.6
6
6
8
6
May
7.2
7
7
8
8
June
6.7
8
7
7
6
July
7.8
8
7
8
8
August
7.3
8
8
7
7
September
7.1
7
6
7
7
October
6.4
8
6
6
6
November
6.4
6
7
6
7
December
6.0
6
6
5
6
Average
6.9
6.9
6.8
6.7
7.3
6.9
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
064°
070°
083°
078°
096°
February
061°
080°
070°
082°
093°
March
042°
078°
014°
066°
107°
April
242°
135°
261°
288°
May
266°
262°
265°
278°
June
263°
278°
273°
252°
July
251°
010°
042°
243°
August
244°
253°
250°
272°
September
258°
209°
258°
250°
October
053°
040°
076°
050°
November
066°
063°
080°
076°
December
072°
067°
071°
078°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.