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
88.2
92
88
92
85
81
February
82.3
93
84
91
76
87
March
90.0
90
90
96
97
78
April
91.5
94
97
87
88
May
91.1
94
93
83
88
June
95.5
98
99
91
97
July
97.5
97
100
95
96
August
96.7
99
96
93
100
September
94.0
96
99
98
88
October
89.2
91
96
93
86
November
85.9
82
81
97
90
December
85.0
92
76
87
82
Average
91.0
91.5
91.6
93.9
90.0
88.8
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
14.3
10
17
15
14
17
February
16.4
20
18
15
13
14
March
21.2
21
21
22
21
21
April
23.9
23
26
23
24
May
28.6
29
31
26
29
June
32.9
31
36
32
33
July
35.5
37
39
33
34
August
34.9
38
35
34
36
September
31.9
34
32
33
28
October
25.9
26
27
28
25
November
19.4
19
17
22
22
December
16.5
17
17
22
16
Average
24.3
17.4
25.3
26.2
25.2
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
3.0
-1
5
1
4
6
February
5.3
9
6
1
3
4
March
10.0
11
11
7
9
13
April
12.3
13
15
11
11
May
17.6
18
19
17
17
June
21.6
19
23
22
21
July
23.0
23
25
22
22
August
23.1
23
24
23
23
September
19.9
21
20
19
19
October
13.5
15
13
16
12
November
8.1
9
7
9
10
December
5.9
6
9
11
4
Average
12.9
6.8
13.5
13.8
14.1
14.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.1
6
7
3
9
8
February
7.1
5
8
6
4
4
March
4.4
6
5
3
2
9
April
4.8
4
2
6
6
May
6.6
7
1
14
7
June
2.4
3
0
2
2
July
1.5
1
0
2
4
August
3.6
0
4
6
0
September
3.7
3
2
1
8
October
7.0
3
8
2
6
November
4.7
5
10
0
1
December
6.2
6
3
3
9
Average
4.8
5.9
4.5
3.2
4.6
5.1
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
8.2
9
8
8
8
7
February
8.6
9
8
8
9
9
March
8.5
7
8
10
9
8
April
8.5
7
10
8
7
May
7.1
5
9
6
8
June
6.6
3
7
5
7
July
5.9
6
7
5
6
August
5.7
6
6
6
5
September
5.2
5
4
5
6
October
6.8
7
6
7
7
November
6.9
6
6
8
7
December
7.2
6
7
8
7
Average
7.2
8.4
6.6
7.3
6.7
6.8
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
296°
246°
308°
306°
201°
February
238°
239°
305°
297°
291°
March
175°
194°
218°
177°
171°
April
161°
180°
150°
201°
May
162°
177°
147°
159°
June
110°
170°
174°
173°
July
185°
181°
170°
168°
August
204°
170°
172°
168°
September
167°
152°
138°
022°
October
224°
202°
208°
138°
November
198°
182°
196°
170°
December
241°
223°
196°
264°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.