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
74.8
84
85
93
85
77
February
80.1
94
80
85
72
80
March
92.5
91
92
97
97
82
April
85.4
89
98
44
92
86
May
79.7
97
0
86
93
June
80.5
96
0
97
97
July
83.3
99
0
97
96
August
83.2
100
0
95
99
September
87.2
95
54
99
87
October
90.0
90
95
97
86
November
89.6
92
84
95
92
December
86.2
96
79
91
82
Average
84.9
90.0
93.4
47.7
92.0
88.5
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
12.6
11
17
15
13
15
February
16.5
21
18
15
12
15
March
21.4
22
22
21
22
22
April
24.0
25
24
26
23
22
May
28.1
28
30
26
27
June
31.7
31
35
31
31
July
34.0
34
38
33
33
August
34.1
38
34
33
34
September
30.9
33
32
32
28
October
25.1
25
26
28
23
November
19.1
19
18
20
22
December
16.2
16
17
22
15
Average
23.9
20.0
25.3
25.8
24.3
24.0
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
2.7
1
6
1
4
5
February
5.2
8
6
0
2
4
March
10.0
11
12
7
9
12
April
12.5
14
12
14
13
12
May
17.5
18
19
17
16
June
21.4
20
22
22
21
July
23.2
24
25
23
23
August
22.9
24
23
23
21
September
19.3
20
18
18
18
October
13.0
14
11
15
12
November
7.3
8
8
7
9
December
5.5
5
10
11
3
Average
12.8
8.8
13.9
13.4
13.3
13.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.8
12
9
4
10
7
February
8.7
3
9
8
5
12
March
5.0
8
2
4
5
13
April
3.4
4
4
0
6
6
May
3.0
2
0
6
5
June
1.4
1
0
2
1
July
1.2
1
0
1
2
August
1.7
1
0
3
0
September
2.8
2
0
0
8
October
6.7
7
5
2
8
November
5.1
4
10
3
1
December
7.1
3
10
4
12
Average
4.3
6.0
3.6
2.9
4.0
6.0
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
5.3
5
7
6
6
5
February
6.4
7
6
7
6
7
March
6.1
5
6
7
6
5
April
5.9
6
5
6
5
5
May
4.9
3
6
4
5
June
4.7
3
5
4
5
July
4.5
4
5
3
4
August
4.4
5
4
4
4
September
3.7
3
3
4
4
October
4.8
5
5
5
4
November
4.9
4
4
5
4
December
5.5
5
5
6
6
Average
5.1
5.6
4.7
5.2
4.8
4.8
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
310°
260°
282°
294°
250°
February
235°
236°
295°
289°
287°
March
197°
210°
209°
187°
189°
April
200°
180°
193°
170°
252°
May
150°
181°
154°
160°
June
195°
192°
182°
186°
July
205°
192°
191°
183°
August
212°
184°
189°
189°
September
155°
165°
156°
348°
October
309°
239°
252°
070°
November
227°
360°
218°
174°
December
259°
231°
202°
250°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.