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
87.4
94
84
91
84
87
February
81.7
93
85
90
70
80
March
88.3
87
89
84
87
84
April
93.2
87
97
93
97
May
92.8
95
92
96
93
June
92.7
91
96
92
90
July
93.1
93
96
90
93
August
92.3
98
91
90
92
September
93.1
95
94
90
86
October
92.0
93
92
92
89
November
88.8
87
86
98
88
December
80.9
89
80
69
88
Average
89.6
90.9
90.7
91.5
88.1
89.1
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
17.7
17
21
17
17
19
February
21.5
21
24
21
20
20
March
24.0
24
25
24
24
27
April
26.1
27
26
25
27
May
30.1
29
30
30
30
June
32.3
31
34
32
32
July
32.6
33
32
32
33
August
32.9
36
32
32
32
September
31.3
31
31
31
30
October
27.8
27
27
27
28
November
22.1
22
23
21
24
December
19.2
18
22
23
18
Average
25.6
20.5
26.9
26.8
26.1
26.6
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
5.6
5
8
4
6
8
February
9.1
7
10
7
8
9
March
11.1
11
12
11
11
14
April
12.6
14
12
12
13
May
17.0
16
18
16
16
June
20.1
19
20
20
19
July
22.4
23
23
22
23
August
22.6
23
22
23
23
September
20.3
20
20
20
21
October
15.4
14
12
16
18
November
9.6
9
12
7
13
December
8.2
7
10
12
4
Average
13.6
7.8
14.6
14.2
14.4
15.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.7
1
6
3
8
4
February
4.5
5
5
2
7
5
March
2.4
3
2
5
2
1
April
2.7
3
2
4
3
May
2.2
1
4
1
2
June
2.7
0
1
3
7
July
3.4
6
3
3
2
August
4.1
2
4
5
5
September
2.9
3
2
5
8
October
2.2
1
0
3
3
November
1.9
5
3
1
1
December
4.6
5
0
1
6
Average
3.0
2.7
3.0
2.5
3.5
3.7
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
5.9
6
6
6
6
6
February
6.2
6
7
6
6
7
March
6.4
6
7
7
6
6
April
5.9
6
6
5
6
May
4.7
5
5
6
5
June
4.3
5
4
5
4
July
3.6
4
3
4
5
August
3.5
5
3
4
4
September
3.8
4
4
3
5
October
4.3
5
4
4
5
November
4.9
5
6
4
6
December
5.4
6
4
5
6
Average
4.8
6.0
5.1
4.9
4.8
5.3
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
304°
226°
302°
272°
125°
February
215°
224°
162°
269°
214°
March
202°
207°
198°
183°
210°
April
140°
181°
210°
261°
May
347°
218°
144°
154°
June
255°
329°
198°
170°
July
262°
216°
232°
248°
August
302°
220°
153°
204°
September
095°
049°
116°
070°
October
046°
034°
019°
080°
November
044°
038°
023°
052°
December
031°
032°
204°
279°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.