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
85.3
92
87
91
85
78
February
93.3
97
92
100
90
98
March
95.1
98
89
97
99
98
April
96.9
99
98
100
95
May
98.9
98
100
100
98
June
99.1
99
100
100
100
July
99.4
99
100
99
100
August
97.7
99
100
98
94
September
96.3
100
99
100
84
October
98.1
98
99
96
99
November
88.8
99
96
78
92
December
79.5
91
78
61
84
Average
94.3
95.6
96.1
97.3
92.7
93.8
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
14.2
14
14
15
15
14
February
16.3
16
14
19
17
19
March
18.3
18
15
22
19
18
April
23.4
23
24
26
24
May
28.2
26
29
30
29
June
32.6
30
34
34
33
July
35.7
36
35
37
35
August
35.4
36
36
35
36
September
32.0
29
34
33
34
October
26.5
27
28
24
29
November
18.4
19
17
17
18
December
13.3
16
11
11
15
Average
23.2
16.1
23.7
25.7
24.7
25.3
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
5.3
7
6
3
5
6
February
5.1
8
4
3
5
5
March
7.1
8
6
7
6
7
April
8.7
8
8
9
10
May
11.9
12
11
12
13
June
14.8
12
16
15
15
July
17.1
16
16
17
16
August
17.2
16
17
17
19
September
16.1
16
16
17
17
October
11.1
11
11
11
12
November
5.8
6
4
9
5
December
4.8
6
4
4
4
Average
9.9
7.5
9.9
9.8
10.4
10.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.8
8
15
1
6
2
February
6.9
7
11
0
3
0
March
7.2
4
17
2
2
7
April
3.0
0
3
1
4
May
1.5
2
1
0
3
June
1.0
1
2
0
1
July
0.1
0
0
0
1
August
0.7
0
0
0
4
September
0.4
1
1
0
0
October
1.2
5
0
3
0
November
2.1
4
3
2
2
December
8.1
6
14
9
4
Average
3.9
6.3
4.8
1.7
1.8
2.4
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
6.1
6
9
4
7
5
February
6.9
8
8
5
6
6
March
7.1
8
9
6
6
7
April
6.6
6
7
6
6
May
7.1
7
9
7
6
June
6.8
7
7
7
7
July
6.0
6
7
6
6
August
5.4
5
5
6
5
September
5.5
5
6
6
5
October
5.1
5
4
6
5
November
4.3
4
5
4
4
December
5.3
4
6
6
5
Average
6.2
7.2
6.3
5.9
6.1
5.7
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
160°
169°
331°
159°
167°
February
169°
190°
320°
317°
330°
March
190°
183°
250°
298°
204°
April
226°
229°
193°
187°
May
183°
277°
250°
206°
June
187°
200°
184°
219°
July
185°
183°
185°
184°
August
206°
190°
189°
197°
September
186°
206°
222°
244°
October
270°
276°
226°
316°
November
322°
225°
299°
310°
December
176°
181°
167°
297°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.