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
84.9
85
77
89
84
86
February
83.7
96
91
89
70
78
March
89.1
83
90
86
95
79
April
91.3
87
94
96
91
May
92.5
91
94
97
92
June
89.2
90
96
90
95
July
86.0
96
92
91
97
August
86.6
95
85
94
94
September
93.3
97
92
92
87
October
91.5
95
92
87
November
87.1
94
87
89
December
80.3
88
64
81
87
Average
88.2
87.6
91.1
89.2
89.9
88.5
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
12.6
11
15
11
12
13
February
14.1
16
18
16
13
14
March
19.2
19
20
20
20
21
April
23.0
22
22
22
22
May
27.2
24
28
26
25
June
30.0
28
31
30
29
July
31.8
32
31
30
32
August
30.1
31
30
30
0
September
28.2
28
27
27
20
October
23.8
23
22
24
November
17.7
17
18
20
December
13.8
14
13
17
13
Average
21.8
15.5
22.7
22.8
22.8
20.6
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
3.3
1
4
1
3
4
February
5.0
4
7
4
3
4
March
7.8
8
7
7
8
10
April
10.4
10
9
9
9
May
15.4
14
16
13
13
June
19.3
18
19
19
18
July
21.4
21
21
21
21
August
20.3
21
20
21
0
September
17.5
16
16
18
13
October
12.2
11
8
13
November
6.7
6
8
8
December
4.7
3
6
8
2
Average
11.1
4.2
11.5
11.6
12.2
10.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.0
17
16
16
12
0
February
8.2
10
23
10
10
0
March
5.9
20
11
4
6
0
April
3.2
10
3
4
0
May
5.4
9
9
4
0
June
8.4
8
9
11
0
July
9.9
6
14
36
0
August
6.6
9
16
14
0
September
13.5
13
16
33
34
October
6.6
7
3
24
November
8.0
8
15
27
December
8.9
14
30
24
7
Average
8.4
16.0
10.8
11.0
14.2
7.2
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
4.6
5
4
5
4
5
February
4.5
4
4
5
6
4
March
4.5
5
2
6
4
4
April
3.9
3
4
4
5
May
3.2
4
3
3
3
June
2.7
3
3
2
3
July
2.0
2
2
2
2
August
2.3
3
2
2
0
September
3.2
3
4
2
3
October
3.8
4
4
4
November
3.9
4
5
4
December
4.2
4
3
3
5
Average
3.6
4.6
3.2
3.6
3.3
3.6
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
305°
291°
306°
302°
329°
February
305°
287°
314°
334°
293°
March
332°
306°
296°
071°
301°
April
360°
289°
298°
298°
May
041°
318°
334°
336°
June
323°
054°
348°
317°
July
302°
281°
279°
360°
August
338°
038°
061°
360°
September
039°
039°
025°
069°
October
344°
360°
045°
November
036°
017°
023°
December
322°
035°
278°
307°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.