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
81.0
66
78
88
93
69
February
81.2
90
79
79
71
90
March
88.7
87
82
91
90
78
April
91.8
88
86
96
89
May
94.4
93
93
95
93
June
95.4
94
93
95
97
July
95.8
93
98
97
95
August
95.6
95
91
97
100
September
95.2
93
96
96
94
October
90.0
82
93
94
90
November
88.0
87
83
94
87
December
80.8
85
48
79
85
Average
89.3
81.2
87.8
88.0
91.9
89.0
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
11.9
9
14
13
12
12
February
14.6
18
16
14
8
14
March
19.6
20
19
20
21
20
April
22.8
22
23
22
22
May
27.4
28
29
24
26
June
31.5
32
32
31
31
July
33.6
33
36
33
33
August
32.9
36
33
34
32
September
30.7
32
31
31
27
October
24.2
25
25
25
22
November
17.3
17
16
17
20
December
14.1
15
13
18
13
Average
22.4
15.5
24.1
24.1
23.0
22.4
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
1.6
-1
5
-1
2
4
February
4.0
6
5
0
-1
4
March
8.1
9
8
5
9
10
April
11.2
11
12
10
11
May
16.6
16
18
14
16
June
21.1
21
21
21
21
July
23.3
23
25
22
24
August
22.8
24
23
24
21
September
19.2
19
18
19
19
October
12.6
13
11
15
12
November
5.9
6
6
5
8
December
4.1
3
6
8
2
Average
11.6
4.6
12.7
12.2
12.2
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
9.5
23
10
9
8
10
February
10.3
9
18
7
9
8
March
6.5
8
12
8
3
11
April
6.3
8
7
6
8
May
4.5
5
2
7
7
June
3.3
2
4
5
5
July
2.8
3
0
3
3
August
4.0
1
9
1
1
September
3.4
3
2
1
6
October
6.6
15
5
4
3
November
6.2
8
9
1
5
December
8.0
5
21
5
8
Average
6.5
12.9
7.2
6.2
4.4
6.1
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
5.4
5
6
6
6
5
February
5.8
5
6
6
5
6
March
6.1
5
6
6
6
6
April
6.0
6
6
6
5
May
5.4
5
6
6
5
June
5.1
5
5
5
5
July
4.8
5
6
4
4
August
4.6
5
5
5
4
September
4.7
4
5
5
5
October
5.2
5
6
5
5
November
4.8
5
5
5
5
December
5.0
5
5
6
5
Average
5.3
5.2
5.0
5.5
5.2
5.0
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
060°
226°
336°
315°
088°
February
215°
199°
272°
072°
340°
March
182°
145°
188°
146°
138°
April
146°
152°
181°
165°
May
128°
174°
131°
119°
June
184°
150°
177°
181°
July
221°
187°
190°
190°
August
177°
117°
170°
235°
September
118°
068°
132°
067°
October
152°
184°
213°
081°
November
114°
087°
150°
129°
December
251°
099°
194°
219°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.