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
76.6
92
72
76
62
90
February
89.2
83
91
95
79
94
March
91.8
95
91
94
85
94
April
93.5
98
88
94
89
100
May
94.9
98
97
98
91
95
June
96.4
95
98
96
95
96
July
97.6
98
100
99
94
99
August
94.9
97
96
91
88
95
September
93.9
92
98
92
93
96
October
92.8
94
93
98
95
88
November
87.9
86
90
82
97
December
81.5
80
55
77
92
Average
92.3
94.7
92.2
92.5
87.4
95.1
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
3.6
4
6
4
2
6
February
6.3
10
6
8
4
9
March
9.6
12
9
10
9
9
April
13.8
16
11
12
10
16
May
18.6
21
19
21
16
17
June
24.3
23
24
25
25
23
July
25.0
26
26
25
24
25
August
25.1
27
24
26
21
26
September
20.2
21
24
18
20
21
October
15.2
15
17
17
14
14
November
8.3
8
9
7
9
December
5.0
6
1
4
6
Average
14.9
17.4
15.0
15.0
13.1
15.0
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
-1.1
-2
2
1
-2
0
February
0.0
4
0
2
-3
3
March
1.7
4
3
0
1
1
April
4.5
7
4
3
2
5
May
8.8
12
8
10
8
7
June
13.7
13
13
14
15
13
July
14.5
15
14
14
15
14
August
15.1
16
16
15
13
16
September
11.1
13
13
10
12
10
October
8.2
8
10
9
6
8
November
3.1
4
3
3
3
December
0.9
2
-3
0
2
Average
6.9
9.0
7.2
6.7
5.9
6.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
26.9
17
24
30
42
16
February
18.0
22
22
20
26
23
March
16.1
8
27
6
17
14
April
11.3
10
17
15
16
2
May
9.2
12
3
4
21
10
June
6.5
9
7
6
6
9
July
7.2
8
8
6
9
8
August
9.4
5
18
8
18
10
September
10.0
13
2
17
7
8
October
13.0
11
17
8
10
19
November
15.6
23
12
24
8
December
23.1
34
19
32
8
Average
12.4
10.6
15.1
11.0
17.0
10.7
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
8.8
10
9
9
7
8
February
9.0
9
8
12
8
11
March
8.7
8
9
8
8
9
April
8.0
8
7
9
8
8
May
7.3
7
7
7
9
7
June
6.3
6
6
6
5
7
July
6.4
6
7
6
6
7
August
6.1
6
6
5
6
6
September
6.6
8
6
6
6
6
October
8.1
8
8
7
9
8
November
8.1
9
8
7
7
December
9.0
9
7
8
10
Average
7.5
7.5
7.5
7.2
7.0
7.6
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
236°
236°
267°
240°
216°
February
240°
263°
248°
157°
239°
March
183°
236°
117°
268°
208°
April
231°
338°
316°
290°
303°
May
136°
073°
279°
244°
308°
June
244°
030°
260°
282°
280°
July
257°
254°
289°
260°
271°
August
276°
249°
359°
271°
241°
September
145°
184°
252°
261°
244°
October
174°
231°
200°
199°
211°
November
234°
170°
225°
196°
December
235°
149°
221°
163°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.