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
82.8
67
83
89
82
83
February
83.8
91
87
92
71
85
March
90.1
88
86
97
95
82
April
90.3
86
95
84
83
May
93.9
95
97
87
96
June
97.2
96
100
93
97
July
98.7
100
99
96
99
August
98.7
100
97
99
100
September
95.3
96
100
100
90
October
91.5
91
99
96
89
November
81.5
81
81
94
87
December
85.0
84
79
91
87
Average
90.2
81.9
90.6
94.3
91.2
90.1
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
16.0
13
19
16
15
17
February
17.9
21
19
16
13
16
March
22.9
23
24
23
23
23
April
25.9
25
28
24
25
May
29.7
29
33
27
30
June
33.5
35
36
32
32
July
35.7
38
38
32
36
August
35.6
39
35
33
36
September
31.9
35
33
33
29
October
26.5
27
28
28
27
November
19.6
20
18
21
23
December
18.3
19
18
23
19
Average
25.3
18.8
27.4
27.2
25.4
26.0
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
4.6
2
7
3
5
7
February
6.4
9
7
2
3
5
March
11.4
12
12
7
10
14
April
14.0
14
17
13
13
May
18.9
19
21
18
18
June
22.6
23
23
22
22
July
23.8
25
24
23
24
August
23.8
25
24
23
23
September
21.0
23
21
21
18
October
15.1
16
15
17
14
November
9.1
10
9
9
11
December
6.8
7
11
12
4
Average
14.0
7.9
15.6
14.9
14.9
14.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.2
4
8
7
6
3
February
4.4
2
6
3
6
6
March
4.5
3
6
1
3
6
April
3.2
6
2
4
3
May
3.2
3
1
7
2
June
1.9
1
1
3
2
July
1.0
0
1
3
2
August
2.8
1
6
2
1
September
3.4
2
0
0
5
October
4.8
9
3
2
1
November
4.9
5
11
4
4
December
5.7
8
4
0
8
Average
3.6
3.0
4.3
3.0
3.2
3.3
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
7.3
7
8
7
8
7
February
7.7
8
8
8
8
8
March
8.2
8
8
9
9
7
April
8.3
8
10
8
7
May
7.4
5
9
7
8
June
6.9
7
7
6
7
July
6.4
6
6
6
7
August
6.6
7
6
6
6
September
5.9
6
5
6
7
October
6.7
7
7
7
7
November
6.4
6
7
7
7
December
6.7
6
6
7
7
Average
7.1
7.4
6.8
7.3
7.0
7.1
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
323°
285°
325°
318°
230°
February
257°
265°
336°
332°
321°
March
182°
165°
214°
170°
159°
April
115°
164°
121°
143°
May
141°
170°
120°
147°
June
175°
159°
150°
155°
July
180°
174°
154°
162°
August
155°
144°
170°
160°
September
147°
129°
115°
038°
October
119°
158°
189°
119°
November
165°
113°
178°
157°
December
226°
178°
186°
290°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.