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
85.5
89
88
86
86
90
February
84.5
89
89
88
66
81
March
87.8
80
89
84
87
88
April
93.5
92
95
97
93
May
85.9
84
71
97
85
June
91.3
83
95
88
95
July
95.2
96
90
96
98
August
93.5
91
95
91
95
September
92.0
86
90
96
94
October
86.0
91
82
91
69
November
88.9
91
76
99
89
December
87.1
83
89
85
88
Average
89.2
85.5
88.6
86.6
90.5
89.2
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
10.1
11
13
9
8
13
February
13.1
12
14
13
8
14
March
15.4
16
15
17
17
19
April
21.1
22
20
20
21
May
24.6
22
24
24
23
June
28.6
26
28
28
29
July
31.3
31
31
30
34
August
30.1
29
30
30
31
September
27.3
26
27
27
27
October
22.3
22
19
23
23
November
16.0
16
17
15
20
December
12.2
13
11
15
11
Average
20.0
12.9
20.9
20.7
20.4
22.0
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
0.8
1
3
-2
0
3
February
2.6
2
4
1
0
4
March
5.0
6
4
6
5
9
April
9.9
11
9
8
9
May
14.4
13
15
11
14
June
19.1
17
18
19
21
July
22.2
22
22
21
24
August
21.5
21
20
22
24
September
18.2
17
17
17
19
October
12.1
11
9
14
12
November
5.2
4
6
4
8
December
2.3
3
1
3
2
Average
10.2
3.0
10.6
10.4
10.4
12.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.5
11
12
14
9
6
February
12.6
11
15
9
19
13
March
9.8
15
8
12
9
9
April
7.4
12
4
3
9
May
8.2
11
15
4
7
June
6.0
8
3
6
9
July
5.0
3
7
5
5
August
6.2
9
5
8
11
September
6.6
8
7
4
12
October
8.4
7
8
5
13
November
8.3
8
11
8
8
December
9.2
8
13
6
14
Average
8.4
12.3
8.7
8.6
6.8
9.2
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
8.1
9
7
9
8
8
February
8.2
8
9
8
8
8
March
9.1
9
9
9
9
9
April
9.2
9
9
9
10
May
8.3
9
8
8
9
June
7.3
7
7
7
8
July
7.2
7
7
7
7
August
6.4
7
6
6
7
September
7.0
6
7
7
7
October
6.9
6
6
8
6
November
7.1
7
7
8
7
December
7.0
6
7
7
8
Average
7.8
8.5
7.4
7.6
7.5
7.7
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
264°
256°
310°
298°
286°
February
248°
263°
228°
329°
244°
March
339°
296°
241°
312°
237°
April
195°
266°
278°
267°
May
048°
037°
034°
024°
June
136°
203°
207°
183°
July
209°
218°
223°
211°
August
182°
203°
207°
198°
September
351°
025°
199°
042°
October
286°
332°
271°
005°
November
001°
080°
287°
228°
December
242°
306°
251°
265°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.