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
75.2
70
73
55
79
72
February
70.7
78
70
66
67
74
March
83.2
82
81
77
93
81
April
88.4
82
93
94
90
May
85.1
77
84
81
91
June
85.7
79
83
93
79
July
89.6
91
85
86
88
August
87.1
86
91
88
89
September
81.1
82
88
87
61
October
75.9
70
64
87
71
November
78.5
89
76
75
81
December
73.9
66
77
74
76
Average
81.3
76.7
79.1
78.8
84.4
80.0
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
7.8
8
8
7
8
8
February
7.2
10
7
8
6
8
March
10.8
12
11
11
11
10
April
13.5
13
13
15
14
May
17.9
20
15
17
18
June
20.5
21
20
23
19
July
23.5
24
24
24
22
August
24.4
25
26
24
23
September
20.7
21
22
20
22
October
14.6
16
18
13
14
November
9.8
10
8
11
10
December
7.2
10
4
4
9
Average
14.2
9.8
15.5
15.0
14.6
14.8
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
3.4
3
4
3
4
4
February
2.3
5
3
3
2
3
March
4.2
6
3
5
4
3
April
6.2
6
5
6
7
May
9.7
11
8
9
10
June
11.7
11
12
14
11
July
13.3
14
14
13
13
August
14.4
16
15
14
14
September
12.5
13
13
12
13
October
8.3
9
10
8
9
November
5.0
5
2
6
5
December
3.0
5
1
1
4
Average
7.4
4.6
8.3
7.8
7.6
8.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.6
26
20
11
24
22
February
19.1
17
24
13
21
14
March
14.3
18
9
16
12
10
April
13.5
19
11
5
6
May
9.5
8
21
5
13
June
7.5
8
10
7
13
July
1.6
1
1
0
5
August
2.3
3
3
2
3
September
6.2
7
1
10
6
October
10.2
11
8
14
8
November
17.2
8
18
29
19
December
16.0
22
10
16
18
Average
11.8
20.4
11.1
10.2
11.0
10.9
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
7.2
7
7
7
7
10
February
6.6
7
7
6
7
6
March
7.3
7
7
7
8
8
April
7.8
9
8
6
7
May
5.9
5
7
6
6
June
5.9
6
6
6
6
July
5.3
6
5
5
5
August
5.4
5
6
5
5
September
5.9
6
6
6
6
October
6.2
6
6
8
6
November
7.0
6
6
9
8
December
6.4
6
6
7
7
Average
6.4
6.9
6.2
6.2
6.6
6.4
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
158°
146°
164°
156°
164°
February
167°
164°
184°
174°
170°
March
173°
181°
186°
190°
188°
April
180°
191°
232°
218°
May
312°
185°
232°
214°
June
279°
215°
285°
228°
July
305°
308°
306°
313°
August
322°
276°
302°
315°
September
242°
335°
187°
277°
October
144°
181°
163°
175°
November
163°
147°
171°
166°
December
153°
074°
174°
160°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.