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
89.7
92
88
91
84
92
February
87.4
95
91
92
72
87
March
92.3
89
95
90
89
88
April
95.1
96
89
95
98
96
May
93.6
90
94
96
94
June
94.4
95
94
93
97
July
94.1
95
94
90
97
August
92.7
94
93
92
95
September
93.6
94
96
92
87
October
92.1
91
90
92
91
November
87.7
89
87
96
87
December
85.9
94
90
86
92
Average
92.0
93.0
92.0
92.3
90.4
92.3
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
18.4
18
21
17
17
20
February
22.0
20
24
22
19
21
March
24.0
23
24
25
24
26
April
26.8
27
27
27
26
27
May
30.2
28
30
30
29
June
27.4
32
0
32
31
July
29.2
34
5
32
34
August
32.8
34
33
32
33
September
31.0
30
30
31
30
October
27.4
26
26
27
28
November
21.7
21
23
21
24
December
19.1
19
20
23
17
Average
25.4
22.0
26.6
21.4
26.1
26.6
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
6.3
5
6
5
7
8
February
9.5
7
9
8
8
9
March
10.8
10
10
11
11
14
April
13.6
14
14
13
13
14
May
17.5
17
16
16
17
June
18.6
20
0
22
21
July
20.4
24
3
23
23
August
22.4
24
17
24
24
September
19.4
20
10
20
21
October
16.1
14
12
16
18
November
9.9
10
10
7
14
December
8.4
8
10
11
5
Average
13.8
9.0
14.6
9.6
14.7
15.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.9
4
3
2
10
3
February
5.3
9
5
2
8
7
March
5.2
6
4
12
8
5
April
3.4
3
6
1
4
5
May
3.4
5
4
1
3
June
5.4
7
5
7
6
July
5.6
4
9
9
4
August
6.4
6
6
12
8
September
4.3
5
4
6
10
October
3.5
4
1
6
2
November
5.6
8
8
7
6
December
6.8
10
3
4
5
Average
4.9
5.0
5.5
4.7
6.7
5.4
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
6.6
7
6
7
6
7
February
6.5
7
7
6
6
8
March
6.8
6
7
7
7
7
April
6.5
6
6
7
6
7
May
6.0
6
6
7
6
June
5.3
6
5
6
5
July
4.5
5
4
5
5
August
4.3
5
3
5
4
September
5.1
5
5
4
6
October
5.4
5
4
4
6
November
5.5
6
7
5
6
December
5.8
6
5
5
5
Average
5.7
6.3
5.7
5.5
5.4
5.8
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
300°
262°
308°
279°
329°
February
271°
263°
225°
301°
256°
March
290°
257°
241°
185°
231°
April
239°
124°
207°
266°
273°
May
022°
226°
154°
196°
June
266°
125°
193°
264°
July
267°
236°
223°
218°
August
229°
196°
164°
200°
September
062°
047°
060°
066°
October
033°
003°
005°
076°
November
037°
043°
016°
052°
December
348°
034°
242°
298°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.