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
2024
2023
2022
2021
2020
January
94.7
89
95
100
100
99
February
95.3
95
94
97
100
97
March
94.2
96
89
95
85
100
April
96.4
96
97
100
100
May
91.7
90
95
90
100
June
89.6
85
99
100
80
July
92.4
93
100
75
100
August
95.5
92
100
100
100
September
94.9
92
98
99
100
October
96.2
92
98
100
99
November
89.7
79
93
97
90
December
94.0
89
90
98
100
Average
95.0
93.6
90.4
96.6
95.7
95.5
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
2024
2023
2022
2021
2020
January
6.0
6
7
8
4
7
February
7.5
8
9
7
7
6
March
8.3
9
7
10
8
8
April
10.5
11
9
11
11
May
13.4
15
13
10
14
June
16.6
19
16
19
17
July
17.2
17
18
18
16
August
17.2
18
19
16
18
September
15.4
17
15
17
15
October
11.9
12
14
13
11
November
8.5
8
10
10
10
December
6.2
7
5
7
7
Average
11.0
7.6
12.4
12.0
12.4
10.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
3.1
1
4
5
2
5
February
3.6
2
2
5
6
4
March
4.0
2
0
7
6
6
April
6.2
2
7
8
10
May
9.1
6
11
8
10
June
12.4
9
14
14
14
July
13.2
10
14
15
13
August
13.3
11
15
14
18
September
10.9
9
11
13
12
October
8.2
6
11
9
9
November
5.1
2
7
7
7
December
3.5
2
3
6
6
Average
7.4
1.3
5.2
9.1
9.7
8.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.2
17
13
6
25
3
February
11.6
18
12
13
0
12
March
12.3
10
23
1
7
6
April
8.8
11
6
0
0
May
7.5
9
9
12
2
June
6.5
6
0
6
4
July
15.6
22
3
11
6
August
7.0
9
6
2
0
September
12.1
13
12
5
2
October
12.4
22
5
9
13
November
13.3
17
11
10
7
December
12.1
19
22
2
6
Average
9.2
14.6
13.9
7.1
7.1
5.7
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
2024
2023
2022
2021
2020
January
10.5
11
12
12
12
11
February
11.3
10
11
14
16
13
March
10.4
11
9
9
11
10
April
10.4
10
9
7
10
May
9.8
9
12
11
11
June
8.6
8
9
10
7
July
9.1
9
11
8
11
August
9.1
9
9
7
10
September
9.4
9
9
9
12
October
10.4
13
10
8
7
November
8.9
9
7
10
9
December
9.5
10
8
8
8
Average
9.9
10.9
9.5
9.9
9.3
9.7
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
229°
242°
224°
250°
193°
February
227°
237°
248°
134°
214°
March
122°
334°
172°
151°
208°
April
082°
031°
285°
049°
May
284°
219°
340°
290°
June
078°
173°
204°
002°
July
308°
264°
010°
275°
August
265°
213°
256°
184°
September
217°
271°
198°
201°
October
130°
168°
209°
297°
November
303°
135°
221°
203°
December
215°
290°
217°
197°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.