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
84.7
81
77
86
87
86
February
82.5
98
83
86
79
78
March
87.0
79
83
84
88
82
April
92.7
83
92
98
94
May
91.7
88
85
95
93
June
91.6
90
92
91
96
July
93.2
95
93
91
96
August
91.7
94
89
88
91
September
92.9
96
92
89
88
October
90.0
92
89
89
89
November
87.6
89
86
98
86
December
81.5
87
63
80
89
Average
88.7
83.9
88.1
87.2
89.7
89.5
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
13.8
12
17
13
13
15
February
17.8
18
20
18
15
16
March
20.5
21
20
21
21
22
April
23.7
23
24
23
24
May
27.7
25
29
27
27
June
30.2
29
32
30
30
July
31.9
32
33
31
32
August
31.5
32
31
31
31
September
29.6
29
29
28
27
October
24.4
23
23
24
25
November
18.5
18
19
19
21
December
15.1
15
15
19
14
Average
22.9
16.8
23.5
24.2
23.3
23.5
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
1
5
1
3
5
February
6.1
6
8
4
3
6
March
7.6
9
7
7
8
12
April
10.1
10
10
9
10
May
15.0
15
14
13
14
June
18.1
17
15
19
18
July
20.9
21
19
22
22
August
20.9
21
21
20
21
September
17.9
17
17
17
18
October
12.3
10
9
13
14
November
5.8
6
8
4
8
December
4.4
3
7
7
1
Average
11.0
4.8
11.5
11.2
11.5
12.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.6
10
11
6
9
11
February
8.7
7
9
10
5
21
March
8.5
14
15
7
7
13
April
5.2
8
4
5
5
May
5.3
7
5
4
5
June
4.1
3
1
7
3
July
2.5
2
2
5
2
August
3.5
1
2
5
4
September
3.6
4
4
4
7
October
4.6
5
2
4
4
November
6.3
9
5
1
3
December
9.5
7
12
7
5
Average
6.2
10.7
6.5
4.5
5.2
6.7
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
5.7
6
5
5
5
6
February
5.5
5
5
6
6
5
March
6.0
6
5
6
5
5
April
5.5
5
5
5
6
May
4.5
5
4
5
5
June
3.9
4
4
4
4
July
3.3
4
3
3
4
August
3.6
4
4
4
3
September
4.2
4
5
4
5
October
4.8
5
5
4
5
November
5.1
5
6
5
5
December
5.1
5
4
4
6
Average
4.8
5.9
4.7
4.5
4.5
4.8
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
311°
295°
308°
296°
328°
February
329°
299°
318°
331°
303°
March
335°
309°
284°
058°
278°
April
001°
282°
308°
306°
May
062°
079°
302°
310°
June
301°
330°
176°
272°
July
296°
246°
260°
288°
August
309°
300°
110°
220°
September
042°
027°
349°
063°
October
333°
325°
324°
058°
November
009°
348°
321°
356°
December
306°
103°
291°
307°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.