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
94.8
91
99
93
96
95
February
98.1
96
99
98
98
97
March
97.3
97
96
97
100
100
April
98.7
99
97
100
99
May
99.5
98
100
100
100
June
99.1
99
99
100
100
July
98.9
99
98
99
100
August
97.6
100
98
99
93
September
96.1
99
98
99
79
October
95.3
98
90
98
93
November
94.7
100
97
99
97
December
94.2
94
91
87
95
Average
96.9
95.0
98.2
96.7
98.2
95.6
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
15.7
16
15
17
16
15
February
16.9
17
15
20
17
19
March
18.0
18
15
21
18
17
April
19.6
21
22
21
21
May
23.5
22
25
25
26
June
27.5
25
29
27
28
July
29.3
30
28
29
29
August
29.7
31
30
29
30
September
28.3
26
30
28
29
October
25.2
26
24
23
28
November
19.4
21
17
20
18
December
15.7
17
13
14
16
Average
21.8
16.7
22.0
23.1
22.3
22.9
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
7.5
9
7
6
8
8
February
7.2
8
4
5
8
9
March
9.0
9
7
8
9
9
April
9.9
9
10
12
11
May
12.7
12
11
13
14
June
15.7
14
16
16
17
July
16.0
15
16
17
16
August
17.2
17
16
17
19
September
16.3
15
17
16
17
October
12.6
12
12
14
15
November
9.0
9
6
11
8
December
7.1
8
5
8
6
Average
11.3
8.3
10.7
10.7
12.2
12.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.1
4
7
0
1
2
February
2.6
3
6
0
1
0
March
3.5
2
6
0
1
2
April
1.5
1
2
0
4
May
0.4
1
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.1
0
0
0
0
October
0.2
0
0
2
0
November
1.8
2
1
1
2
December
2.3
3
2
5
1
Average
1.5
2.9
2.0
0.3
0.8
0.9
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
5.0
5
9
2
5
3
February
5.5
6
5
4
4
5
March
5.8
6
7
5
6
4
April
5.9
6
6
6
4
May
6.2
6
7
7
5
June
6.4
6
7
7
6
July
5.4
4
5
6
5
August
5.3
5
5
5
4
September
4.8
5
5
4
3
October
4.3
4
4
5
2
November
3.5
3
3
3
3
December
4.1
4
3
5
3
Average
5.3
5.4
5.3
4.8
5.3
4.1
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
197°
154°
308°
313°
309°
February
154°
279°
319°
312°
320°
March
281°
174°
315°
294°
261°
April
320°
310°
311°
310°
May
260°
312°
314°
298°
June
284°
311°
309°
310°
July
312°
308°
306°
289°
August
298°
306°
302°
307°
September
305°
302°
306°
308°
October
308°
309°
296°
306°
November
289°
304°
303°
294°
December
146°
171°
140°
296°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.