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
87.8
81
86
89
95
90
February
86.8
93
93
81
81
88
March
87.6
83
88
82
89
89
April
87.8
83
92
94
89
May
88.6
96
85
94
90
June
93.4
89
96
98
98
July
96.4
96
99
93
98
August
97.0
97
99
96
99
September
93.0
81
96
98
98
October
88.5
88
87
95
81
November
95.5
99
94
99
92
December
86.1
78
84
90
93
Average
90.4
85.6
89.7
90.8
93.7
92.3
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
5.7
5
9
4
5
7
February
7.9
8
9
8
5
8
March
10.7
12
11
12
12
13
April
16.2
19
15
17
14
May
21.9
22
22
22
21
June
27.1
25
27
29
29
July
30.5
30
31
29
32
August
29.1
28
31
29
30
September
25.4
25
25
26
25
October
19.9
20
18
21
19
November
12.8
12
15
13
16
December
8.0
10
8
11
8
Average
16.8
8.3
18.3
18.2
18.3
18.5
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
0.0
1
4
-3
1
1
February
0.8
2
1
-1
-1
2
March
3.3
5
4
3
4
5
April
8.3
10
8
9
7
May
13.5
13
14
13
12
June
19.0
18
19
20
20
July
23.0
23
23
22
24
August
22.4
21
23
23
23
September
18.9
19
18
20
19
October
13.5
14
12
15
13
November
6.4
6
8
7
9
December
2.7
5
3
5
3
Average
9.9
2.5
11.4
10.9
11.4
11.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.7
24
17
14
4
8
February
14.7
8
8
21
28
17
March
13.5
19
14
18
7
14
April
11.6
12
9
10
14
May
11.1
4
15
11
7
June
5.0
5
4
4
2
July
4.5
4
1
6
4
August
5.5
7
3
6
6
September
9.1
23
7
5
3
October
11.0
12
13
4
18
November
7.4
3
11
5
10
December
14.0
16
22
4
13
Average
10.5
17.1
9.9
10.4
7.6
9.1
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
10.8
10
10
11
11
11
February
10.2
10
10
11
10
10
March
11.4
12
11
11
11
10
April
10.9
10
12
10
12
May
9.4
9
9
9
10
June
8.8
9
9
8
9
July
8.2
8
8
8
8
August
8.5
9
8
8
9
September
9.2
10
9
10
9
October
9.5
8
10
9
9
November
10.2
9
10
10
10
December
10.2
9
11
9
11
Average
9.8
10.6
9.2
9.7
9.4
9.7
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
317°
313°
312°
320°
299°
February
321°
298°
293°
338°
295°
March
329°
320°
294°
303°
010°
April
022°
314°
302°
312°
May
322°
065°
324°
306°
June
019°
220°
202°
244°
July
200°
198°
306°
195°
August
267°
184°
158°
199°
September
029°
323°
292°
052°
October
302°
019°
357°
355°
November
301°
280°
292°
264°
December
318°
331°
300°
282°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.