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
79.0
73
78
74
69
86
February
75.6
85
79
69
70
74
March
89.1
88
85
91
97
87
April
93.4
96
92
91
98
94
May
94.6
94
95
92
98
94
June
97.3
100
100
97
96
93
July
99.2
98
100
99
99
100
August
96.0
98
95
99
100
99
September
88.9
92
95
98
94
68
October
81.7
81
81
71
81
86
November
74.0
85
82
70
71
65
December
68.2
65
74
63
70
Average
87.7
90.5
87.9
86.5
87.8
85.6
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
8.5
8
9
9
9
10
February
9.2
11
8
11
8
11
March
12.9
14
11
14
13
13
April
16.5
17
15
14
20
18
May
21.6
20
24
18
22
21
June
25.0
25
26
23
29
24
July
29.6
31
30
30
30
28
August
30.1
29
31
32
30
29
September
25.3
26
24
27
26
26
October
18.5
19
19
22
16
19
November
11.2
11
12
9
12
11
December
8.1
10
7
7
9
Average
18.2
19.1
18.3
18.3
18.4
18.2
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
2.1
2
3
1
4
5
February
1.4
4
0
1
2
1
March
2.7
4
2
4
1
2
April
5.0
5
5
4
3
5
May
8.2
7
9
7
7
9
June
10.6
10
10
11
12
11
July
12.4
13
12
14
12
13
August
13.0
13
14
14
13
12
September
10.8
11
11
11
10
12
October
6.2
7
8
8
7
7
November
3.5
5
3
1
6
3
December
1.9
4
0
2
2
Average
6.6
7.2
6.7
6.4
6.5
6.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
20.3
32
18
16
19
29
February
19.8
25
22
10
25
9
March
18.2
23
23
14
15
15
April
15.0
14
25
17
4
9
May
9.3
10
4
20
8
13
June
6.1
5
4
10
6
11
July
0.7
1
1
1
0
1
August
0.9
1
3
0
1
1
September
5.4
3
7
2
7
5
October
10.6
15
11
16
13
4
November
16.5
20
10
19
20
22
December
18.6
20
15
26
20
Average
11.1
12.9
11.9
11.4
10.9
10.8
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
4.9
5
6
4
4
7
February
5.0
5
5
4
5
5
March
5.1
5
6
4
5
5
April
5.2
5
5
5
4
4
May
4.0
4
4
5
4
5
June
4.0
4
4
4
4
4
July
3.2
4
3
3
3
4
August
3.1
3
3
3
4
4
September
3.6
3
4
3
4
4
October
3.9
4
4
3
5
4
November
4.3
5
3
5
5
4
December
4.0
3
4
5
5
Average
4.2
4.2
4.1
3.8
4.3
4.4
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
156°
133°
189°
164°
182°
February
165°
178°
112°
199°
217°
March
181°
168°
207°
206°
185°
April
220°
192°
226°
015°
201°
May
283°
018°
210°
290°
192°
June
251°
344°
246°
334°
268°
July
336°
332°
350°
348°
331°
August
304°
346°
338°
326°
328°
September
353°
242°
029°
223°
094°
October
202°
169°
098°
168°
190°
November
175°
211°
137°
182°
198°
December
196°
140°
179°
163°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.