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
91.7
87
80
96
99
95
February
94.2
84
96
97
98
98
March
89.4
89
79
95
98
94
April
90.6
83
99
94
90
May
92.4
88
96
97
88
June
88.6
96
88
87
94
July
85.1
78
90
93
87
August
88.2
78
95
92
90
September
86.2
49
96
94
83
October
94.1
77
94
95
98
November
94.3
97
95
91
99
December
95.0
96
89
88
98
Average
90.3
86.8
83.1
94.1
93.6
92.6
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
19.1
20
18
16
21
20
February
19.2
18
18
23
21
21
March
19.3
19
17
22
20
19
April
21.7
20
23
23
21
May
21.4
20
22
22
24
June
23.8
23
25
25
25
July
26.4
28
26
27
27
August
27.2
28
29
28
30
September
26.9
26
30
29
31
October
26.2
27
25
27
29
November
22.9
25
22
26
23
December
19.3
22
18
14
22
Average
22.4
19.2
22.6
23.4
23.5
24.2
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
4.7
6
5
0
5
4
February
4.8
9
4
1
7
5
March
7.6
9
7
7
6
9
April
10.0
10
10
11
12
May
12.6
14
12
14
14
June
14.7
15
15
16
15
July
16.3
17
17
18
16
August
15.8
15
18
17
18
September
13.8
15
18
17
14
October
11.5
11
15
12
13
November
6.3
7
5
7
7
December
3.9
7
4
0
4
Average
10.0
7.9
10.4
10.3
10.8
10.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.1
12
22
1
2
0
February
6.6
21
4
2
1
3
March
6.1
13
11
3
3
6
April
2.1
0
0
1
11
May
1.5
1
2
0
0
June
0.9
2
0
3
1
July
0.2
1
0
1
0
August
0.5
3
0
1
0
September
0.9
2
4
0
0
October
0.9
3
0
3
0
November
3.5
3
7
0
2
December
4.0
3
9
5
1
Average
3.8
14.7
4.4
2.0
1.6
1.8
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
3
5
4
February
4.8
4
5
5
5
5
March
5.0
5
5
6
5
5
April
5.3
5
6
6
5
May
5.2
4
6
6
5
June
5.2
4
6
6
5
July
5.4
5
6
6
6
August
5.5
5
6
5
6
September
5.1
4
5
5
5
October
5.0
5
5
5
5
November
4.6
4
5
5
4
December
3.5
3
4
4
4
Average
4.9
4.3
4.5
5.1
5.2
4.8
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
225°
201°
212°
232°
218°
February
225°
240°
237°
229°
217°
March
234°
248°
223°
236°
231°
April
270°
230°
223°
215°
May
314°
222°
221°
227°
June
310°
215°
219°
227°
July
211°
218°
217°
225°
August
216°
219°
218°
216°
September
227°
218°
218°
211°
October
212°
222°
225°
219°
November
219°
214°
202°
221°
December
215°
219°
224°
211°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.