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
89.4
90
88
94
90
93
February
87.9
88
81
92
86
97
March
88.2
85
91
84
91
93
April
91.6
95
94
97
87
92
May
92.5
91
79
96
97
93
June
98.4
99
96
100
100
96
July
99.5
100
100
100
100
100
August
99.0
100
99
100
100
99
September
97.7
97
97
97
100
99
October
90.7
94
86
91
90
94
November
85.6
96
92
71
81
December
88.6
96
62
99
84
Average
93.2
94.3
92.1
93.8
93.4
94.1
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
2024
2023
2022
2021
2020
January
10.1
12
12
11
10
12
February
11.8
14
12
12
12
14
March
13.8
16
15
11
13
14
April
17.1
20
15
16
15
17
May
22.0
24
20
24
23
22
June
28.2
30
26
30
30
25
July
31.3
33
33
31
33
29
August
31.3
33
31
29
32
31
September
26.3
27
28
26
26
27
October
21.7
23
25
22
20
21
November
16.7
18
17
17
17
December
12.2
13
14
13
13
Average
20.5
23.1
20.5
20.5
20.3
20.1
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
5
5
4
3
4
February
3.7
6
3
4
4
4
March
4.8
7
5
2
4
4
April
7.0
9
6
6
6
7
May
11.5
13
11
11
11
11
June
16.5
18
15
18
16
14
July
18.9
21
20
19
19
17
August
19.5
21
20
19
20
20
September
16.1
16
18
15
16
17
October
12.1
13
14
12
12
11
November
9.4
10
9
11
9
December
5.7
5
9
6
6
Average
10.8
12.8
11.0
10.6
10.7
10.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.8
8
12
7
11
1
February
6.0
7
5
6
8
5
March
7.0
5
6
13
8
7
April
6.0
6
13
5
8
5
May
4.2
3
12
2
0
2
June
2.0
2
4
1
1
5
July
0.5
0
0
1
0
1
August
0.4
1
0
1
0
1
September
1.8
3
1
3
3
1
October
4.5
5
4
5
6
6
November
8.1
5
11
10
9
December
6.6
5
10
7
8
Average
4.2
3.4
5.3
4.8
4.3
3.8
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
9.5
10
9
10
9
9
February
9.9
10
9
10
10
10
March
10.1
11
10
9
10
9
April
9.3
8
9
10
10
8
May
8.9
10
9
8
9
11
June
8.4
9
8
8
8
9
July
8.6
9
9
8
8
8
August
8.5
8
10
9
9
9
September
8.8
9
10
10
7
10
October
8.5
9
9
8
8
9
November
9.2
10
8
10
7
December
9.7
8
10
11
9
Average
9.1
9.3
9.0
9.0
9.0
9.0
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
299°
276°
331°
224°
330°
February
158°
344°
322°
311°
310°
March
172°
230°
346°
325°
359°
April
225°
317°
268°
177°
350°
May
170°
111°
104°
258°
330°
June
358°
339°
343°
339°
313°
July
353°
333°
349°
341°
347°
August
353°
336°
338°
348°
357°
September
234°
004°
235°
350°
347°
October
148°
156°
340°
337°
193°
November
217°
241°
164°
356°
December
265°
165°
299°
178°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.