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
87.0
83
90
72
95
93
February
72.1
95
90
0
77
85
March
74.2
89
90
0
91
89
April
75.0
89
0
94
91
May
81.3
98
52
93
93
June
94.7
96
98
98
96
July
95.3
94
99
93
96
August
97.4
96
99
98
98
September
95.4
89
98
97
99
October
90.1
93
88
97
83
November
95.8
99
94
100
93
December
90.3
89
91
93
93
Average
87.8
88.8
92.6
62.7
94.0
92.6
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
5.3
5
9
4
5
7
February
8.0
8
10
8
4
8
March
10.8
13
10
13
13
13
April
16.5
17
16
18
15
May
21.6
20
22
23
21
June
26.4
23
27
28
27
July
28.2
29
32
30
21
August
28.6
27
31
30
29
September
25.2
24
25
26
25
October
19.6
20
18
21
18
November
12.5
12
14
12
16
December
7.6
10
8
10
7
Average
16.6
8.7
17.7
18.3
18.2
17.3
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
0
3
-4
-1
1
February
0.0
1
2
-1
-2
0
March
2.6
5
4
3
3
4
April
7.9
13
7
7
5
May
12.6
17
13
12
7
June
15.2
21
18
19
1
July
17.2
23
23
19
2
August
18.3
20
22
22
15
September
14.6
17
16
18
9
October
10.7
12
9
14
10
November
3.9
3
6
3
6
December
1.1
3
1
3
0
Average
7.9
1.6
11.8
9.5
9.6
4.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.8
17
12
7
4
5
February
10.4
7
10
0
17
11
March
8.8
13
13
0
8
9
April
7.6
0
0
9
11
May
10.3
2
3
11
7
June
4.7
5
5
4
3
July
4.4
3
3
3
4
August
5.3
5
2
5
7
September
6.7
20
7
3
2
October
8.9
11
13
3
13
November
6.0
2
8
3
9
December
9.0
7
14
3
10
Average
8.2
12.6
8.7
4.4
5.9
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
6.9
7
6
7
9
6
February
6.1
7
6
7
7
5
March
8.0
9
9
8
9
6
April
7.7
7
9
8
8
May
5.9
7
7
7
7
June
5.2
6
6
6
5
July
4.2
5
5
5
4
August
4.6
6
6
5
5
September
5.1
7
6
6
6
October
5.4
6
6
6
6
November
6.3
6
7
6
7
December
5.8
6
7
6
7
Average
6.1
7.7
6.1
6.7
6.4
5.8
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
319°
316°
322°
324°
311°
February
329°
310°
304°
341°
298°
March
317°
324°
307°
313°
347°
April
211°
317°
314°
325°
May
249°
107°
329°
303°
June
005°
289°
267°
285°
July
286°
279°
301°
270°
August
218°
230°
265°
266°
September
045°
320°
318°
071°
October
316°
019°
339°
349°
November
318°
304°
310°
300°
December
312°
338°
304°
306°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.