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
81.7
75
76
92
78
86
February
83.0
98
80
80
67
89
March
87.6
75
89
87
89
88
April
91.7
86
93
98
97
May
91.5
89
92
98
82
June
93.5
90
96
94
95
July
92.9
94
83
96
97
August
88.3
79
90
93
85
September
90.0
94
80
90
87
October
87.9
94
83
91
87
November
87.7
89
87
97
88
December
82.4
87
75
84
84
Average
87.9
81.9
87.3
87.2
90.4
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
12.1
12
15
11
11
13
February
16.0
16
18
16
11
15
March
18.3
19
19
20
19
20
April
22.7
22
23
23
22
May
26.3
24
27
26
24
June
29.9
28
32
30
29
July
32.1
32
32
31
33
August
31.1
32
31
32
30
September
28.4
27
28
28
26
October
23.7
23
22
25
24
November
17.0
18
19
17
19
December
13.9
15
12
18
12
Average
21.8
15.6
22.8
22.9
22.6
22.2
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
2
5
0
2
4
February
5.1
5
7
4
2
5
March
7.1
8
8
7
8
10
April
10.5
11
10
10
10
May
15.4
14
17
14
14
June
19.1
18
20
19
19
July
21.4
22
22
21
22
August
20.7
20
21
21
22
September
17.7
17
17
17
17
October
12.1
11
10
14
13
November
5.6
5
8
4
8
December
3.7
4
4
7
1
Average
10.9
4.8
11.7
11.9
11.5
12.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.7
19
10
12
11
14
February
9.0
9
4
9
15
15
March
9.5
15
13
11
7
9
April
8.0
18
5
3
5
May
5.4
8
3
4
10
June
4.4
10
2
5
4
July
2.3
1
3
5
2
August
3.9
7
2
6
5
September
5.2
4
8
6
6
October
4.7
4
1
5
6
November
7.0
8
9
4
6
December
10.7
12
10
6
9
Average
7.3
14.5
8.2
5.8
6.1
7.1
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
6.5
7
6
8
6
7
February
7.1
7
7
7
7
7
March
7.1
6
6
7
7
7
April
7.0
7
7
7
7
May
6.2
7
6
6
6
June
5.6
6
5
6
7
July
5.1
4
6
5
5
August
4.5
4
4
4
4
September
5.4
5
6
5
6
October
5.3
5
6
6
5
November
5.8
5
6
6
5
December
6.0
6
5
7
6
Average
6.0
6.9
5.7
6.1
5.9
5.9
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
265°
246°
315°
294°
299°
February
250°
241°
292°
330°
243°
March
334°
276°
242°
351°
246°
April
261°
245°
270°
267°
May
007°
276°
268°
300°
June
302°
299°
237°
263°
July
252°
229°
238°
250°
August
292°
255°
264°
237°
September
021°
017°
334°
032°
October
305°
359°
281°
015°
November
015°
005°
324°
304°
December
271°
322°
237°
285°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.