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
82.7
74
94
82
67
February
77.8
89
72
82
78
77
March
89.4
85
88
94
90
77
April
89.6
89
92
89
85
May
91.3
93
92
84
96
June
94.6
95
98
95
94
July
91.5
69
99
94
96
August
87.1
86
89
6
96
September
77.7
68
98
16
86
October
88.1
90
90
94
82
November
87.8
89
83
88
89
December
84.4
95
79
84
82
Average
86.6
82.0
85.4
91.5
77.9
86.2
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
13.9
13
15
13
15
February
16.5
20
23
15
11
16
March
21.3
22
22
21
21
22
April
23.5
24
25
22
23
May
28.1
29
30
25
27
June
31.5
32
34
31
32
July
33.1
33
36
32
33
August
33.3
38
33
31
32
September
30.5
32
31
30
28
October
24.9
26
25
27
23
November
18.9
19
18
19
21
December
16.3
17
17
21
15
Average
23.7
18.0
26.9
25.1
23.3
23.9
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
2.8
1
1
4
5
February
5.6
9
12
1
1
4
March
9.2
11
10
5
9
13
April
11.2
12
12
10
12
May
16.4
17
17
16
16
June
20.2
21
21
21
19
July
19.8
7
23
21
23
August
21.2
18
22
23
21
September
16.9
10
17
16
19
October
12.6
14
11
14
12
November
6.8
8
7
6
8
December
5.3
4
9
10
3
Average
11.8
6.9
11.8
12.4
12.1
12.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.8
13
0
0
0
February
0.9
8
0
0
0
0
March
1.1
7
4
0
0
0
April
1.1
8
0
0
0
May
0.4
3
0
0
0
June
0.2
2
0
0
0
July
0.2
2
0
0
0
August
0.0
0
0
0
0
September
0.4
3
0
0
0
October
0.7
4
2
0
0
November
1.6
3
8
0
0
December
1.8
3
15
0
0
Average
1.7
9.1
3.1
1.4
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
5.3
6
6
5
5
February
5.7
7
5
6
6
6
March
5.9
5
7
6
6
6
April
5.7
6
7
5
5
May
5.0
4
6
5
6
June
4.3
4
4
4
5
July
3.6
3
6
4
4
August
3.3
4
4
3
4
September
2.6
3
3
3
4
October
4.3
6
2
5
4
November
4.5
5
4
5
4
December
5.1
5
6
7
5
Average
4.8
6.3
4.7
5.0
4.8
4.7
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
288°
292°
297°
258°
February
225°
206°
275°
345°
276°
March
180°
193°
229°
177°
184°
April
183°
188°
187°
192°
May
173°
186°
159°
158°
June
192°
185°
183°
188°
July
212°
201°
204°
192°
August
242°
183°
168°
123°
September
151°
058°
063°
015°
October
240°
047°
255°
095°
November
225°
036°
192°
100°
December
274°
239°
205°
255°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.