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
80.5
79
82
88
90
75
February
84.4
96
94
87
78
75
March
91.2
92
92
96
94
86
April
94.4
95
94
95
95
95
May
95.7
97
95
98
93
June
95.9
97
98
94
96
July
95.9
98
97
92
95
August
94.0
92
97
95
92
September
93.4
99
95
91
94
October
90.7
92
98
92
79
November
92.5
97
97
92
97
December
85.9
89
67
86
91
Average
91.6
90.3
93.8
93.8
91.8
89.6
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
7.4
5
11
7
8
9
February
11.0
16
14
10
5
9
March
16.5
19
15
17
20
17
April
20.5
22
21
20
20
19
May
25.4
25
26
24
23
June
29.4
30
31
29
29
July
31.1
31
33
30
32
August
29.8
29
31
30
29
September
28.0
28
28
27
26
October
21.7
22
22
23
20
November
14.1
16
15
14
17
December
10.9
12
11
16
10
Average
20.1
15.4
21.3
21.0
20.5
20.0
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
-1.9
-2
3
-3
0
1
February
1.8
4
4
-1
-4
1
March
6.1
7
5
6
9
8
April
9.5
12
9
9
9
8
May
15.3
15
16
13
14
June
19.2
18
19
20
19
July
21.4
21
23
21
22
August
20.0
20
21
21
20
September
16.9
16
16
17
17
October
10.6
11
9
13
10
November
3.7
5
4
3
7
December
2.0
3
3
6
0
Average
10.1
5.2
10.9
10.3
10.7
10.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
7.7
7
8
8
8
7
February
8.3
8
9
8
8
9
March
8.4
8
9
9
8
8
April
7.8
9
8
7
7
7
May
6.9
6
8
6
7
June
6.2
6
6
6
7
July
5.4
6
6
6
5
August
5.1
5
6
5
5
September
5.5
4
6
5
6
October
6.6
7
8
7
6
November
6.9
7
7
6
7
December
7.5
7
7
8
8
Average
6.9
8.1
6.7
7.1
6.6
6.7
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
249°
233°
308°
266°
210°
February
247°
218°
238°
331°
283°
March
215°
240°
216°
145°
223°
April
215°
209°
201°
227°
250°
May
014°
182°
132°
225°
June
294°
284°
190°
176°
July
218°
229°
183°
197°
August
276°
211°
214°
316°
September
021°
345°
196°
035°
October
244°
203°
214°
024°
November
235°
224°
220°
216°
December
217°
209°
200°
225°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.