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
88.5
79
89
99
84
85
February
85.2
94
87
89
76
89
March
90.0
89
88
98
94
80
April
91.2
93
92
98
84
91
May
87.7
65
85
75
96
June
95.8
92
97
90
99
July
98.7
100
100
95
99
August
97.3
100
98
93
100
September
91.1
95
100
83
86
October
91.0
89
94
97
89
November
88.7
91
88
90
94
December
87.2
93
76
98
88
Average
91.1
88.7
90.4
94.3
88.7
91.4
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
14.2
11
17
15
13
16
February
16.4
20
17
15
12
16
March
21.2
21
21
22
21
22
April
23.8
24
24
27
22
24
May
29.1
28
32
24
30
June
32.6
34
35
29
32
July
35.0
38
38
32
35
August
34.9
39
35
33
37
September
31.2
34
32
32
28
October
25.0
25
26
27
25
November
19.2
19
17
20
22
December
16.1
17
16
22
16
Average
24.1
18.8
26.1
26.3
24.1
25.1
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
2.0
0
4
-1
3
5
February
4.0
7
4
0
2
3
March
8.6
9
9
7
9
12
April
10.4
9
11
13
11
11
May
16.2
16
18
15
16
June
20.7
21
22
20
20
July
21.7
24
24
22
22
August
22.1
24
22
22
22
September
18.8
21
19
18
17
October
11.9
12
12
14
11
November
6.6
8
7
8
9
December
4.7
5
7
9
3
Average
11.6
6.1
13.2
12.7
12.5
12.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.4
7
4
1
6
4
February
5.7
3
9
7
5
6
March
3.7
6
4
2
2
7
April
3.9
4
3
0
11
4
May
3.1
3
1
9
4
June
2.7
2
2
4
1
July
1.9
3
0
4
2
August
2.8
0
3
4
1
September
4.0
4
3
1
7
October
6.4
6
5
2
4
November
4.3
5
8
4
3
December
5.3
5
2
0
8
Average
3.9
4.9
3.6
2.7
4.1
4.1
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
8.3
8
9
8
8
8
February
8.6
9
9
8
9
9
March
9.4
9
9
10
11
8
April
9.5
10
9
11
9
8
May
8.3
6
10
8
8
June
7.6
7
8
7
8
July
6.6
7
7
6
6
August
6.3
8
7
7
4
September
5.9
7
6
6
2
October
7.4
8
7
7
7
November
7.6
7
7
8
8
December
7.6
8
7
8
8
Average
7.8
8.7
7.7
8.2
7.6
6.9
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
292°
255°
290°
309°
231°
February
251°
246°
280°
308°
279°
March
198°
215°
228°
220°
203°
April
183°
131°
187°
201°
206°
May
161°
182°
092°
164°
June
173°
176°
170°
169°
July
195°
183°
173°
169°
August
188°
151°
173°
171°
September
183°
169°
167°
166°
October
171°
177°
195°
187°
November
204°
188°
202°
194°
December
231°
207°
232°
269°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.