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
92.9
92
88
100
98
95
February
94.2
86
99
100
95
97
March
92.1
92
85
94
97
92
April
91.3
81
100
92
91
May
85.1
72
89
91
84
June
82.6
87
88
82
83
July
83.6
83
84
83
81
August
87.4
87
91
89
90
September
90.4
87
97
89
90
October
95.2
99
90
93
96
November
96.1
98
97
90
99
December
96.3
98
96
90
99
Average
90.3
90.1
88.1
93.3
90.5
90.9
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
19.0
18
16
22
20
19
February
18.6
17
17
23
20
20
March
19.1
17
16
22
19
18
April
21.7
19
23
22
20
May
21.4
19
22
22
24
June
25.0
22
27
26
25
July
28.8
29
28
29
28
August
29.5
29
30
30
29
September
28.2
24
30
30
29
October
26.8
27
25
26
29
November
23.5
24
21
26
24
December
19.4
20
16
18
21
Average
22.7
17.2
21.8
24.3
23.9
23.8
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
8.8
8
8
9
9
8
February
8.1
9
7
9
8
9
March
8.8
9
7
9
8
9
April
11.0
10
12
11
12
May
12.1
12
12
13
14
June
14.2
13
15
14
15
July
16.4
16
16
16
16
August
16.4
17
18
17
11
September
15.6
15
19
16
13
October
14.4
15
15
13
16
November
11.5
12
10
12
11
December
9.2
10
8
8
10
Average
11.8
8.6
11.8
12.7
11.9
11.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.6
8
17
1
4
0
February
7.9
18
5
3
2
5
March
6.0
7
16
2
4
9
April
2.4
1
0
1
10
May
2.4
2
0
1
0
June
0.6
0
0
1
2
July
0.2
1
0
1
0
August
0.5
4
0
1
0
September
1.3
3
4
1
0
October
0.8
0
0
3
1
November
2.6
2
4
0
2
December
5.5
2
9
11
3
Average
3.9
11.0
4.2
1.6
2.3
2.5
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
4.0
4
5
4
4
4
February
4.8
3
6
6
4
4
March
5.0
5
5
5
5
5
April
5.0
5
6
5
5
May
4.8
4
5
4
4
June
4.2
4
5
4
4
July
4.1
4
5
4
4
August
4.3
4
5
4
4
September
4.0
3
5
4
4
October
4.2
4
4
4
4
November
4.2
4
5
4
4
December
3.5
3
4
4
3
Average
4.3
3.8
4.1
4.7
4.1
4.0
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
264°
264°
298°
302°
268°
February
241°
254°
276°
263°
262°
March
239°
233°
230°
231°
236°
April
233°
234°
225°
223°
May
232°
223°
220°
222°
June
226°
221°
218°
226°
July
221°
218°
214°
215°
August
219°
216°
217°
214°
September
231°
225°
217°
220°
October
233°
223°
224°
229°
November
298°
245°
241°
248°
December
277°
246°
240°
314°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.