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
81.2
80
71
97
87
71
February
78.6
86
78
76
76
77
March
87.7
81
87
86
86
84
April
89.6
87
92
89
89
May
92.7
95
92
91
91
June
93.1
96
95
92
90
July
93.9
96
95
97
93
August
91.7
99
83
94
98
September
91.4
96
91
86
91
October
88.3
89
94
85
88
November
85.4
80
79
90
87
December
83.2
89
77
83
86
Average
87.7
81.8
88.8
88.3
88.2
87.3
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
15.9
14
19
17
15
16
February
18.8
20
21
17
13
18
March
22.5
22
23
22
23
24
April
24.9
24
27
24
25
May
29.4
30
32
28
28
June
32.6
34
35
33
32
July
33.7
36
36
33
33
August
34.3
40
34
34
34
September
32.1
35
32
31
30
October
27.3
29
28
28
26
November
20.8
21
21
20
22
December
17.9
18
20
23
16
Average
25.0
18.5
27.4
27.0
25.4
25.2
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
5.2
3
9
3
5
7
February
8.1
9
10
5
4
7
March
11.3
12
11
9
11
14
April
13.0
13
15
14
11
May
18.6
19
21
18
17
June
22.0
23
24
23
21
July
23.6
25
25
23
24
August
23.0
26
24
24
22
September
20.6
22
20
20
21
October
14.9
15
13
17
14
November
8.4
9
10
8
10
December
7.2
6
10
13
5
Average
13.9
7.6
15.6
14.9
15.0
14.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.0
11
14
3
7
12
February
9.8
9
18
9
6
11
March
7.7
9
6
4
6
6
April
5.6
10
7
7
2
May
4.8
3
4
8
5
June
4.3
1
2
5
5
July
3.5
1
2
1
6
August
5.2
0
7
5
2
September
4.9
2
3
8
6
October
5.6
10
2
2
6
November
6.9
9
8
4
6
December
7.3
6
8
6
7
Average
6.5
9.7
6.4
4.8
5.2
5.8
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
7.8
8
8
8
8
7
February
7.8
8
8
8
8
8
March
7.7
7
8
8
8
8
April
7.9
8
9
7
7
May
6.9
6
8
7
7
June
5.9
6
5
7
6
July
4.8
5
6
4
6
August
4.9
6
5
5
5
September
5.0
5
4
5
6
October
6.2
7
6
6
6
November
6.1
6
6
5
6
December
6.7
7
6
7
7
Average
6.6
7.5
6.4
6.6
6.4
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
358°
194°
315°
289°
129°
February
226°
206°
027°
058°
262°
March
139°
158°
208°
139°
155°
April
114°
173°
130°
069°
May
134°
181°
131°
148°
June
239°
151°
149°
151°
July
237°
198°
213°
180°
August
270°
156°
100°
026°
September
065°
041°
086°
043°
October
117°
167°
177°
024°
November
040°
074°
109°
056°
December
206°
182°
194°
210°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.