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
79.2
4
88
97
84
February
80.4
53
89
92
74
0
March
92.0
75
95
99
98
April
94.2
97
99
87
May
82.4
98
21
79
June
82.7
97
0
96
July
87.6
100
82
80
August
97.0
99
98
94
96
September
90.6
94
93
99
70
October
89.3
86
80
97
89
November
89.7
80
88
93
96
December
79.2
26
86
99
91
Average
83.0
44.8
88.4
76.7
89.9
86.9
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
13.9
2
19
17
14
February
16.8
16
18
16
13
13
March
22.7
23
23
24
22
April
25.8
27
29
23
May
29.9
31
35
26
June
34.4
37
39
31
July
37.0
41
41
33
August
36.4
42
34
34
36
September
32.8
37
35
34
28
October
26.6
27
29
29
26
November
20.3
19
19
22
23
December
16.0
7
18
25
17
Average
24.5
13.5
27.3
27.8
25.5
24.5
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
2.6
0
5
0
4
February
4.7
7
6
1
2
13
March
9.2
10
9
7
9
April
12.3
12
14
11
May
17.4
17
19
17
June
21.2
22
22
20
July
23.2
25
25
22
August
22.5
23
23
22
22
September
19.4
21
20
19
17
October
13.1
15
14
14
11
November
7.6
8
8
8
9
December
5.0
2
9
10
3
Average
12.1
5.6
13.6
12.8
13.1
11.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.0
0
4
2
4
February
2.9
0
3
4
3
0
March
1.2
2
0
1
1
April
2.0
1
0
5
May
2.0
1
0
4
June
0.9
1
0
1
July
0.6
1
0
1
August
1.9
0
4
3
1
September
2.3
2
1
0
1
October
4.3
2
3
1
1
November
2.2
2
5
3
1
December
2.8
0
1
0
7
Average
1.9
0.7
1.4
1.4
2.1
2.3
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
7.4
0
9
8
9
February
8.4
7
10
7
7
0
March
9.8
8
10
11
11
April
9.8
9
12
9
May
8.0
6
10
8
June
7.1
7
8
6
July
6.5
6
7
6
August
6.6
7
6
7
5
September
5.7
6
6
6
7
October
6.7
7
7
8
8
November
7.4
6
8
8
8
December
7.2
3
7
8
9
Average
7.3
5.2
7.1
8.3
7.7
7.4
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
176°
252°
293°
305°
February
249°
246°
252°
250°
360°
March
204°
208°
233°
190°
April
146°
189°
143°
May
158°
186°
143°
June
175°
175°
165°
July
187°
180°
171°
August
166°
104°
176°
139°
September
179°
164°
143°
044°
October
190°
183°
213°
159°
November
237°
196°
211°
189°
December
242°
206°
218°
279°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.