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
83.9
84
96
85
78
83
February
90.8
97
88
97
82
95
March
95.6
90
99
95
99
98
April
97.6
100
96
96
99
100
May
97.4
98
99
100
98
99
June
98.0
98
100
100
94
99
July
99.2
100
100
100
97
100
August
98.4
96
99
98
100
September
96.9
99
97
97
98
October
90.1
98
87
79
91
November
80.4
98
86
77
68
December
81.3
83
72
82
88
Average
94.1
96.0
96.5
94.7
91.6
94.5
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
5.5
6
7
6
5
7
February
9.2
12
8
10
9
12
March
12.6
14
12
14
12
12
April
16.4
16
14
15
14
21
May
20.3
20
20
23
17
21
June
25.7
23
27
27
26
24
July
26.8
26
26
29
24
27
August
26.4
25
30
22
28
September
22.3
26
21
22
23
October
17.0
19
19
15
15
November
9.5
10
12
7
10
December
6.6
8
2
7
7
Average
16.6
16.6
16.9
17.7
15.0
17.2
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
0.1
-1
3
0
0
1
February
1.4
5
1
3
0
4
March
2.8
5
4
1
1
3
April
5.1
6
5
5
2
5
May
9.5
11
11
10
8
8
June
14.2
14
15
14
15
13
July
14.9
15
15
14
15
14
August
15.0
16
16
14
16
September
10.9
13
11
11
11
October
7.8
8
10
6
8
November
3.6
5
5
3
4
December
1.6
3
-2
2
2
Average
7.3
8.1
8.3
7.3
6.3
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
19.0
22
14
7
28
9
February
12.6
16
8
11
16
21
March
12.3
13
16
6
9
17
April
10.4
18
13
20
7
2
May
8.7
14
3
4
14
6
June
6.2
12
1
4
9
11
July
5.1
7
8
1
9
4
August
6.5
11
2
11
4
September
5.8
2
10
5
5
October
11.7
14
10
8
15
November
17.4
27
15
21
8
December
21.7
23
14
21
28
Average
10.5
13.8
10.4
7.6
12.1
9.7
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
8.3
8
10
7
8
7
February
8.5
9
8
11
7
11
March
8.2
6
9
7
7
10
April
7.4
7
7
9
8
8
May
6.8
6
8
6
9
7
June
5.9
6
7
5
5
7
July
5.8
5
7
6
6
6
August
5.5
6
7
5
5
September
5.8
5
6
6
6
October
6.5
6
5
6
8
November
6.8
10
6
6
6
December
7.6
9
6
7
6
Average
6.8
6.5
7.3
6.7
6.6
7.1
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
211°
208°
217°
213°
215°
February
209°
243°
219°
019°
217°
March
227°
219°
020°
234°
029°
April
219°
042°
020°
005°
012°
May
233°
023°
318°
218°
021°
June
249°
015°
297°
313°
257°
July
243°
231°
333°
266°
271°
August
235°
006°
233°
255°
September
298°
231°
344°
298°
October
219°
215°
237°
214°
November
211°
209°
217°
212°
December
212°
024°
214°
211°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.