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
77.2
78
89
78
74
71
February
95.3
93
96
97
94
96
March
96.3
99
92
97
99
99
April
98.4
100
100
100
98
May
99.1
97
100
100
100
June
99.8
100
99
100
100
July
99.7
100
100
99
100
August
96.4
100
100
90
87
September
96.8
99
100
100
79
October
97.1
98
100
95
89
November
86.4
98
99
69
95
December
78.9
85
72
56
81
Average
93.5
90.1
96.3
96.1
90.5
91.6
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
14.1
15
15
15
15
14
February
16.4
17
15
18
18
19
March
18.5
19
16
22
19
18
April
23.5
24
24
26
24
May
27.8
26
29
30
29
June
32.8
30
34
34
33
July
35.6
37
36
36
35
August
35.0
36
37
35
36
September
32.1
30
35
33
33
October
26.9
28
29
24
30
November
18.7
21
18
18
19
December
13.8
16
12
11
15
Average
23.7
16.8
24.4
26.2
24.8
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
5.5
8
7
3
5
6
February
5.1
8
4
3
5
5
March
7.0
9
7
7
6
7
April
9.4
10
9
9
10
May
11.9
12
11
13
13
June
15.0
14
16
15
15
July
16.3
17
17
16
15
August
16.7
18
18
16
18
September
15.0
16
18
14
16
October
10.4
12
12
11
11
November
6.3
7
4
8
5
December
4.5
6
4
5
3
Average
10.0
8.2
10.8
10.3
10.2
10.2
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
10
17
0
5
3
February
7.1
10
11
0
2
0
March
8.9
7
21
1
3
9
April
3.1
0
3
0
5
May
2.4
4
1
0
3
June
0.5
1
1
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.6
1
2
0
0
October
1.1
2
0
6
0
November
4.0
3
3
3
3
December
8.3
6
17
12
4
Average
4.1
9.0
5.2
1.7
2.3
2.2
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
6.8
7
10
5
7
6
February
7.7
8
8
6
7
7
March
7.8
8
10
7
7
8
April
7.1
7
8
6
6
May
7.6
7
9
8
7
June
7.1
7
8
7
7
July
6.1
6
7
6
6
August
5.5
6
5
5
5
September
5.8
6
6
6
5
October
6.1
6
4
7
5
November
5.3
6
6
4
6
December
5.7
5
7
6
6
Average
6.7
7.5
6.8
6.6
6.5
6.2
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
170°
194°
336°
156°
177°
February
185°
214°
332°
327°
333°
March
191°
197°
262°
303°
198°
April
239°
237°
191°
204°
May
177°
307°
276°
220°
June
181°
201°
176°
209°
July
184°
181°
178°
180°
August
205°
186°
181°
186°
September
183°
204°
208°
298°
October
327°
312°
210°
330°
November
329°
271°
328°
306°
December
201°
194°
179°
337°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.