Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
75.5
64
85
78
85
80
February
87.9
72
89
94
92
95
March
84.8
81
73
88
93
91
April
90.0
91
90
90
91
May
88.3
77
95
91
89
June
88.5
79
90
91
91
July
84.1
83
80
82
84
August
81.1
82
84
79
80
September
84.1
78
88
86
70
October
85.1
88
78
77
87
November
82.0
87
87
79
89
December
76.1
66
75
66
88
Average
83.1
72.3
81.3
85.9
84.3
86.0
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi 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
15.0
15
15
17
16
15
February
17.1
16
15
20
18
21
March
17.7
17
14
21
18
18
April
21.1
21
21
22
22
May
23.9
21
26
26
25
June
27.8
24
29
27
29
July
29.0
31
28
28
28
August
29.5
30
30
28
31
September
28.9
26
31
28
31
October
25.8
26
24
23
30
November
19.3
20
18
19
20
December
14.7
16
13
12
16
Average
21.7
16.2
21.7
23.4
22.0
23.6
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
4.6
6
5
3
4
5
February
3.8
6
2
2
4
4
March
5.3
7
5
5
3
5
April
7.0
7
6
5
8
May
8.9
10
8
9
9
June
11.0
11
11
11
12
July
11.2
11
11
11
11
August
12.2
14
12
11
13
September
11.1
12
11
11
12
October
7.7
9
8
8
9
November
4.6
6
2
6
3
December
3.8
6
2
5
2
Average
7.4
6.1
8.0
7.0
7.3
7.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.9
23
23
5
8
6
February
12.4
27
14
1
4
0
March
13.6
15
32
3
8
8
April
5.3
2
7
1
4
May
3.2
4
2
0
5
June
0.7
1
1
0
0
July
0.0
0
0
0
0
August
0.2
0
1
0
1
September
0.8
1
3
1
0
October
3.3
4
1
12
0
November
7.2
7
6
5
6
December
14.0
20
19
22
6
Average
7.5
21.5
8.5
3.4
4.6
2.9
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
4.0
4
6
3
5
3
February
5.3
5
5
4
5
5
March
5.4
6
6
5
6
5
April
5.4
6
6
5
5
May
5.6
5
7
7
5
June
5.6
5
6
6
6
July
5.3
5
6
6
5
August
4.8
5
5
5
5
September
4.5
4
5
5
4
October
4.2
4
4
5
4
November
3.2
3
3
3
4
December
3.2
3
3
4
3
Average
4.8
5.3
4.7
4.7
5.1
4.6
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
209°
166°
157°
291°
277°
February
173°
279°
328°
303°
340°
March
216°
227°
245°
301°
246°
April
243°
251°
190°
235°
May
185°
272°
227°
209°
June
191°
202°
198°
220°
July
175°
177°
175°
181°
August
183°
183°
176°
178°
September
199°
188°
191°
203°
October
227°
204°
217°
177°
November
236°
240°
204°
265°
December
181°
220°
235°
330°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.