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
85.4
79
95
70
94
85
February
95.5
94
93
100
97
99
March
98.1
98
97
98
100
100
April
98.2
97
98
98
98
98
May
98.0
98
99
100
97
97
June
98.7
99
99
98
99
99
July
99.0
98
100
100
97
100
August
98.8
100
99
98
99
September
98.9
99
99
98
99
October
94.4
98
92
91
97
November
89.1
97
92
81
87
December
82.4
89
60
73
94
Average
95.8
95.6
97.5
94.7
94.5
96.6
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
7.2
9
8
5
6
9
February
11.5
12
11
12
13
14
March
14.7
15
14
15
14
14
April
17.9
17
16
17
16
22
May
21.6
20
21
25
19
23
June
27.1
25
28
29
27
25
July
29.7
29
30
31
27
30
August
29.4
31
31
26
30
September
25.1
28
23
25
26
October
19.5
22
22
18
16
November
11.9
13
14
9
14
December
8.5
10
5
8
9
Average
18.7
18.3
19.4
19.6
17.3
19.3
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
1.5
2
3
0
1
2
February
2.5
5
1
2
4
4
March
4.6
6
5
4
4
5
April
7.0
8
6
6
5
9
May
11.3
11
11
13
10
12
June
16.0
16
16
17
16
15
July
17.7
17
18
18
16
18
August
17.4
18
18
16
18
September
13.6
15
13
15
14
October
10.0
11
12
8
9
November
5.1
5
7
5
5
December
2.7
3
1
2
3
Average
9.2
9.2
9.2
9.4
8.4
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.8
24
18
10
31
15
February
11.8
13
4
11
10
18
March
12.0
6
16
5
12
9
April
11.6
16
16
15
11
5
May
14.0
23
10
4
26
7
June
8.6
11
5
9
9
12
July
6.0
7
7
0
18
3
August
5.2
8
6
6
4
September
8.6
5
10
8
14
October
12.3
13
8
8
17
November
16.4
27
18
13
5
December
23.2
24
20
20
24
Average
11.6
13.8
11.8
8.5
13.8
10.1
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
7.2
7
9
7
7
7
February
7.5
8
6
7
10
10
March
7.8
8
9
8
8
7
April
7.8
9
7
8
9
6
May
7.2
6
8
9
6
8
June
6.9
7
6
8
8
7
July
6.8
6
7
8
6
7
August
6.4
7
7
5
7
September
6.3
7
7
6
7
October
7.4
8
8
8
9
November
6.2
7
6
6
6
December
6.5
6
6
6
9
Average
7.0
7.2
7.1
7.4
6.9
7.2
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
219°
272°
346°
299°
191°
February
178°
347°
309°
180°
189°
March
185°
198°
179°
340°
336°
April
248°
327°
340°
340°
171°
May
247°
340°
345°
229°
346°
June
310°
350°
263°
317°
347°
July
339°
210°
353°
339°
353°
August
319°
347°
352°
328°
September
166°
230°
157°
332°
October
173°
175°
230°
190°
November
190°
178°
345°
168°
December
203°
338°
178°
179°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.