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
84.6
82
80
82
84
87
February
76.8
84
77
76
68
72
March
85.4
78
83
79
89
April
91.4
87
91
93
96
May
96.1
95
92
97
97
June
97.6
98
99
97
97
July
98.0
96
99
98
99
August
98.2
99
99
96
98
September
96.6
96
96
97
94
October
94.2
95
91
99
94
November
91.2
86
85
97
94
December
78.6
82
74
68
90
Average
90.5
82.9
89.1
89.9
90.4
92.6
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
16.9
16
20
16
16
18
February
19.9
19
22
19
17
19
March
22.1
22
22
22
25
April
24.4
25
25
23
26
May
28.2
28
28
27
28
June
30.7
31
32
30
31
July
31.7
32
31
31
32
August
31.9
35
31
32
31
September
30.8
31
31
31
29
October
27.3
27
26
28
27
November
22.0
21
22
20
25
December
18.5
18
21
21
17
Average
24.5
17.7
25.8
25.5
25.0
25.5
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
6.7
6
9
4
7
10
February
10.7
9
12
8
8
10
March
12.4
13
11
13
16
April
14.3
15
14
13
15
May
19.0
19
20
18
18
June
22.4
22
23
22
23
July
23.5
23
24
23
23
August
23.6
25
24
22
25
September
21.9
22
21
21
22
October
16.8
16
14
17
17
November
10.5
11
12
8
13
December
9.2
9
12
13
6
Average
14.9
7.5
16.2
15.6
15.4
16.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.1
14
15
17
9
13
February
10.3
15
11
12
8
16
March
6.8
8
10
9
6
April
5.1
9
7
6
2
May
5.2
5
10
4
3
June
8.3
7
9
7
9
July
6.4
6
11
7
8
August
9.4
4
16
4
15
September
7.1
10
8
4
15
October
6.8
6
6
4
4
November
6.4
17
7
2
4
December
7.7
12
7
5
6
Average
8.1
14.4
8.8
10.1
5.7
8.0
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
8.0
9
8
8
7
8
February
8.3
8
9
9
8
8
March
8.8
9
9
9
8
April
8.6
8
9
8
8
May
7.6
7
8
8
8
June
7.0
8
7
8
8
July
6.0
6
6
5
7
August
6.0
7
6
6
6
September
6.7
6
7
5
8
October
7.3
7
7
7
7
November
7.4
8
8
7
8
December
7.3
8
6
7
7
Average
7.5
8.7
7.4
7.4
7.1
7.6
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
058°
253°
012°
328°
050°
February
085°
164°
089°
044°
125°
March
167°
151°
126°
178°
April
149°
149°
138°
222°
May
169°
172°
152°
177°
June
216°
198°
171°
165°
July
236°
191°
207°
202°
August
217°
184°
170°
175°
September
102°
058°
133°
096°
October
058°
099°
128°
077°
November
050°
041°
026°
046°
December
045°
082°
174°
022°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.