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
82.8
80
72
88
84
83
February
80.1
93
87
85
68
76
March
88.1
86
90
87
88
81
April
90.1
86
93
94
93
May
89.9
93
91
95
84
June
91.9
89
96
89
92
July
95.7
99
95
92
97
August
92.6
94
91
91
93
September
91.4
97
88
90
86
October
86.5
98
81
78
83
November
86.8
96
85
82
89
December
78.6
77
59
74
91
Average
88.1
86.3
90.0
88.4
85.8
87.6
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
11.2
9
14
11
12
12
February
15.2
15
18
16
13
12
March
17.7
18
19
19
20
18
April
21.8
22
22
23
21
May
25.6
24
28
26
23
June
28.4
28
31
29
27
July
30.4
32
32
30
31
August
29.4
30
30
31
29
September
26.8
27
27
27
20
October
22.3
23
19
22
23
November
16.5
17
18
15
20
December
13.0
14
13
18
13
Average
20.6
13.5
22.1
22.6
22.0
20.7
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
-1
5
2
3
4
February
5.0
0
8
5
4
4
March
6.6
2
7
9
9
9
April
10.3
11
11
10
9
May
15.5
15
17
16
13
June
17.4
18
21
20
8
July
17.8
21
22
21
2
August
18.2
21
21
22
2
September
15.3
18
16
18
2
October
12.3
12
9
13
14
November
6.0
7
8
4
9
December
4.2
4
6
8
3
Average
9.7
0.4
12.0
12.5
12.2
6.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.5
15
18
11
9
18
February
14.1
7
14
10
17
23
March
9.2
11
12
6
12
17
April
6.3
12
3
4
5
May
6.3
3
4
4
9
June
5.6
7
2
6
6
July
3.3
2
4
8
3
August
5.4
5
2
7
8
September
5.0
2
4
8
9
October
8.4
2
5
13
10
November
7.4
7
11
1
4
December
16.8
17
25
20
8
Average
8.3
11.1
8.1
6.2
8.9
9.4
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
7
5
5
6
6
February
5.8
6
6
6
6
6
March
6.3
7
6
8
6
6
April
6.1
7
6
6
7
May
5.3
6
6
5
6
June
4.4
5
4
4
5
July
3.8
4
4
3
4
August
3.6
4
3
3
3
September
4.4
4
5
4
5
October
4.6
5
4
4
4
November
4.7
5
6
4
5
December
5.1
5
4
5
5
Average
5.1
6.3
5.0
5.0
4.6
5.1
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
277°
265°
268°
287°
314°
February
252°
250°
261°
325°
279°
March
290°
256°
262°
101°
269°
April
241°
240°
259°
282°
May
049°
220°
219°
290°
June
284°
343°
205°
253°
July
257°
237°
227°
249°
August
268°
189°
161°
224°
September
052°
048°
335°
079°
October
281°
069°
252°
074°
November
037°
015°
261°
360°
December
275°
268°
244°
297°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.