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
76.3
82
81
67
70
80
February
88.0
89
72
93
85
94
March
90.3
92
87
96
89
90
April
94.9
98
91
93
91
99
May
95.5
97
95
99
95
98
June
96.3
94
98
99
95
94
July
95.9
97
95
98
93
96
August
95.3
96
90
96
91
98
September
95.0
94
97
95
94
96
October
94.1
89
95
99
92
94
November
88.9
94
94
75
95
December
79.5
78
75
74
85
Average
92.3
93.6
90.7
93.9
88.6
94.0
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
5.4
6
7
6
4
8
February
7.9
10
8
9
7
9
March
10.8
12
10
13
10
10
April
14.1
15
12
13
11
17
May
18.5
20
18
20
15
18
June
23.2
21
25
23
24
22
July
23.9
23
23
25
23
22
August
24.1
25
22
27
21
26
September
20.1
20
24
19
21
21
October
15.8
16
17
18
15
14
November
9.6
9
11
8
12
December
6.7
8
3
7
7
Average
15.3
16.8
15.2
15.9
13.9
15.5
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
1.3
1
3
2
1
3
February
2.0
6
2
3
0
4
March
3.3
6
4
2
3
3
April
5.0
7
4
5
2
5
May
8.6
11
8
9
8
7
June
13.0
12
13
12
15
13
July
13.7
14
14
14
14
13
August
14.5
16
14
15
13
16
September
10.8
12
13
11
11
11
October
9.0
9
10
10
8
9
November
4.3
5
6
4
5
December
2.8
4
-2
2
3
Average
7.5
9.3
7.9
7.5
6.7
7.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.5
15
20
14
17
10
February
14.0
18
19
21
12
20
March
10.5
9
18
2
8
9
April
7.2
14
12
11
7
1
May
5.3
5
5
4
12
1
June
3.3
6
2
4
3
4
July
6.2
5
9
4
10
9
August
4.9
4
9
1
8
1
September
5.8
4
3
11
3
4
October
9.1
9
12
4
10
13
November
8.2
14
2
9
3
December
17.3
24
12
11
13
Average
7.9
8.1
10.9
6.6
8.5
6.4
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
9.3
11
11
8
8
10
February
10.0
11
8
13
8
13
March
9.1
8
10
7
9
10
April
7.5
9
8
8
6
7
May
6.3
6
5
6
8
6
June
6.3
7
6
6
5
6
July
6.6
7
9
6
6
7
August
6.7
7
7
6
7
7
September
6.8
7
6
6
6
7
October
8.4
6
9
8
8
10
November
8.3
11
9
7
8
December
9.1
11
5
8
9
Average
7.6
7.6
8.0
7.1
7.1
7.9
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
221°
211°
228°
213°
206°
February
209°
235°
220°
165°
215°
March
199°
215°
099°
229°
190°
April
217°
153°
034°
296°
066°
May
142°
040°
230°
214°
312°
June
227°
057°
218°
208°
217°
July
219°
219°
243°
214°
229°
August
210°
221°
013°
228°
204°
September
197°
186°
210°
203°
222°
October
195°
207°
199°
198°
206°
November
210°
191°
217°
201°
December
217°
138°
205°
188°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.