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
89.0
92
79
94
87
87
February
82.8
92
80
86
70
80
March
89.3
87
90
80
91
88
April
94.4
90
96
95
97
May
95.0
93
94
97
96
June
94.2
92
94
96
95
July
95.4
94
93
93
96
August
95.9
98
95
95
96
September
96.0
94
98
96
91
October
94.5
94
93
94
93
November
90.4
88
89
99
91
December
83.7
93
78
70
91
Average
91.8
89.7
90.5
91.3
90.9
92.0
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
18.6
18
22
17
17
20
February
22.1
21
24
21
20
20
March
24.4
25
25
25
24
27
April
26.6
28
27
25
27
May
30.5
30
31
30
30
June
32.3
32
34
32
32
July
32.8
34
32
32
33
August
33.0
36
32
32
33
September
31.9
32
33
30
30
October
28.2
28
28
27
28
November
22.6
23
24
22
25
December
19.6
19
22
22
18
Average
26.3
21.4
27.6
27.3
26.2
26.9
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
6.5
6
8
5
7
9
February
9.8
7
12
8
9
9
March
11.5
12
13
11
12
15
April
13.7
16
14
13
15
May
18.1
19
18
17
18
June
22.3
22
23
22
22
July
23.3
24
23
23
23
August
22.8
25
23
24
18
September
21.3
21
20
20
22
October
16.7
15
12
17
19
November
10.3
10
13
6
14
December
8.8
8
11
12
4
Average
14.6
8.5
16.0
15.1
15.0
15.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.6
3
5
5
11
8
February
8.0
9
10
6
13
10
March
4.3
8
4
10
4
1
April
2.8
3
2
6
3
May
3.1
2
2
2
3
June
4.9
3
1
6
7
July
4.1
5
6
5
4
August
5.5
5
4
9
6
September
4.6
5
5
5
12
October
3.7
3
0
5
4
November
3.9
10
7
2
2
December
6.6
7
1
3
5
Average
4.9
6.7
4.9
4.0
5.7
5.2
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
8
7
7
7
7
February
7.2
7
8
7
7
8
March
7.5
6
8
8
7
7
April
7.5
8
8
7
8
May
6.4
6
6
7
7
June
5.7
7
5
6
6
July
5.0
5
5
5
6
August
5.3
6
5
6
5
September
5.9
5
6
5
7
October
6.5
6
6
6
7
November
6.2
6
8
5
8
December
6.3
7
5
6
6
Average
6.4
6.9
6.4
6.3
6.1
6.6
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
335°
198°
324°
269°
067°
February
193°
218°
142°
021°
194°
March
162°
202°
184°
150°
194°
April
131°
149°
196°
266°
May
025°
178°
115°
115°
June
258°
045°
172°
125°
July
263°
209°
224°
219°
August
314°
186°
140°
177°
September
076°
043°
096°
067°
October
034°
024°
006°
061°
November
024°
021°
010°
041°
December
034°
066°
195°
320°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.