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
87.9
88
89
87
87
90
February
86.2
89
90
88
69
89
March
89.3
79
91
87
89
87
April
94.8
93
93
96
96
97
May
87.0
83
76
97
81
June
92.7
78
96
97
95
July
96.6
93
93
99
100
August
94.5
90
97
95
92
September
94.7
91
96
98
96
October
90.6
96
83
96
80
November
92.0
92
91
97
87
December
90.7
84
92
90
90
Average
91.3
87.3
88.7
89.9
93.2
90.6
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
10.8
12
14
9
10
13
February
14.0
12
15
13
10
14
March
16.0
17
16
17
18
19
April
21.5
22
23
20
21
21
May
24.9
22
24
26
23
June
28.8
27
28
30
29
July
31.9
32
32
32
34
August
30.2
30
30
30
31
September
27.3
27
28
27
26
October
22.6
22
20
23
23
November
16.5
16
17
15
20
December
13.1
14
12
15
13
Average
20.8
15.7
21.4
21.1
21.4
22.1
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
2.6
4
5
-1
3
5
February
4.5
4
7
2
3
5
March
6.9
8
7
7
8
9
April
11.6
12
13
11
12
10
May
16.0
15
16
15
14
June
20.7
19
20
22
21
July
23.3
24
23
23
25
August
22.9
23
23
23
24
September
20.0
20
20
19
21
October
14.6
13
12
16
16
November
8.0
8
10
7
10
December
4.8
5
5
6
4
Average
12.3
6.9
13.2
12.5
12.7
13.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.3
14
5
16
7
5
February
10.5
16
7
5
20
10
March
9.4
19
14
9
4
9
April
7.0
8
16
5
2
9
May
10.0
14
21
3
7
June
5.0
8
3
6
8
July
4.9
4
9
4
2
August
6.8
12
4
7
6
September
5.1
8
6
3
9
October
6.8
8
9
3
8
November
7.6
10
9
6
5
December
8.8
11
8
5
13
Average
8.0
13.7
9.7
8.7
5.6
7.3
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
8.7
9
8
10
8
9
February
9.4
9
10
10
10
9
March
9.6
9
10
9
10
10
April
9.7
10
10
9
9
10
May
9.1
10
9
9
9
June
8.0
8
7
8
9
July
8.0
8
9
8
7
August
7.2
7
7
7
8
September
8.5
8
10
8
9
October
8.1
7
8
9
8
November
8.3
8
8
9
7
December
7.9
7
8
8
8
Average
8.6
9.2
8.3
8.8
8.5
8.6
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°
248°
349°
310°
315°
February
353°
318°
257°
350°
260°
March
026°
344°
228°
022°
351°
April
235°
169°
262°
279°
264°
May
042°
043°
017°
037°
June
103°
078°
188°
146°
July
190°
216°
215°
181°
August
077°
131°
119°
174°
September
023°
033°
082°
038°
October
326°
359°
015°
018°
November
018°
028°
330°
220°
December
300°
348°
307°
257°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.