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
86.4
83
77
91
88
89
February
86.6
97
94
95
85
80
March
91.1
90
94
95
91
78
April
94.3
90
96
97
97
May
96.2
97
96
97
97
June
96.0
95
98
97
96
July
97.5
98
96
97
99
August
95.5
95
95
95
96
September
96.4
100
98
95
97
October
93.8
99
99
90
92
November
91.9
95
92
95
94
December
83.3
81
67
86
88
Average
92.5
89.5
93.0
94.1
93.2
92.2
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
11.4
9
14
10
11
13
February
15.7
17
18
15
13
14
March
18.8
20
19
20
20
20
April
23.0
23
23
23
22
May
27.4
26
28
26
25
June
30.4
30
32
31
30
July
32.4
32
33
31
34
August
31.4
32
31
31
32
September
29.5
30
28
28
28
October
23.7
25
22
23
24
November
16.9
19
17
16
20
December
13.4
14
13
17
12
Average
22.0
15.4
23.3
23.2
22.6
22.8
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
2.2
0
5
0
3
5
February
4.9
4
7
2
2
4
March
7.6
9
7
7
8
11
April
10.4
11
10
10
9
May
16.2
16
17
15
15
June
20.1
19
21
21
20
July
22.4
22
23
22
23
August
21.9
22
22
22
23
September
18.8
18
18
18
19
October
12.5
12
9
15
14
November
5.5
7
7
3
7
December
4.0
4
6
7
2
Average
11.3
4.2
12.4
12.0
12.2
12.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.5
17
15
11
8
11
February
13.5
7
15
7
14
22
March
9.1
13
10
3
12
16
April
7.0
14
5
4
5
May
4.9
4
5
3
8
June
5.8
8
3
5
5
July
3.5
4
4
5
3
August
5.1
4
5
8
4
September
5.1
1
5
8
5
October
5.8
4
1
6
8
November
6.4
7
7
3
5
December
12.2
14
28
6
9
Average
7.8
12.3
8.0
6.1
6.5
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
5.8
6
6
6
6
6
February
6.1
6
7
6
6
6
March
6.8
6
7
7
6
6
April
6.4
6
7
6
7
May
5.6
6
6
6
6
June
5.2
6
5
5
6
July
4.4
4
5
5
4
August
4.4
5
4
4
4
September
4.7
4
6
4
5
October
4.9
5
6
4
5
November
5.0
5
5
5
5
December
5.2
5
5
6
5
Average
5.4
5.8
5.3
5.6
5.3
5.3
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
303°
242°
338°
306°
279°
February
259°
212°
229°
319°
268°
March
271°
264°
219°
330°
229°
April
263°
202°
273°
302°
May
279°
201°
209°
229°
June
306°
338°
179°
217°
July
269°
207°
207°
248°
August
336°
192°
132°
216°
September
357°
005°
357°
010°
October
285°
322°
207°
309°
November
008°
320°
352°
326°
December
269°
209°
195°
262°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.