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
92.8
96
87
94
96
96
February
93.8
91
93
99
98
97
March
90.7
77
95
99
94
April
92.6
79
99
97
92
May
92.8
83
98
98
91
June
88.4
93
86
84
95
July
91.8
90
90
91
89
August
93.4
88
95
96
92
September
94.4
97
98
91
96
October
95.2
95
95
95
94
November
92.6
100
95
79
89
December
94.0
96
96
80
99
Average
92.7
93.0
89.5
94.8
92.0
93.5
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
18.5
18
16
20
19
18
February
17.7
17
17
20
19
19
March
18.1
16
20
18
17
April
19.5
18
21
20
19
May
19.2
18
20
19
21
June
21.2
19
22
21
23
July
23.5
23
23
23
22
August
24.5
24
25
24
25
September
24.7
23
28
23
25
October
23.9
23
23
22
24
November
21.4
23
20
21
20
December
18.7
20
16
16
20
Average
20.5
17.1
19.9
21.4
20.3
20.8
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
9.6
9
8
9
9
10
February
9.5
10
8
10
10
10
March
10.3
9
11
9
11
April
12.3
11
13
12
13
May
13.5
13
14
14
15
June
14.7
15
16
16
17
July
17.7
17
17
18
16
August
18.2
18
19
17
18
September
18.1
18
20
16
18
October
15.5
15
16
14
16
November
12.1
12
10
13
11
December
10.0
11
9
9
9
Average
13.0
9.4
12.8
13.7
13.0
13.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.0
6
12
2
2
0
February
6.8
17
9
0
0
1
March
7.2
16
2
3
9
April
1.1
0
0
0
7
May
0.9
1
0
0
1
June
0.1
0
0
0
1
July
0.0
0
0
0
0
August
0.5
3
0
0
0
September
0.2
0
0
0
0
October
0.5
0
1
2
0
November
2.1
2
5
0
1
December
4.8
5
7
14
2
Average
3.4
11.4
3.8
1.1
1.6
2.0
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
4.7
5
5
4
5
4
February
5.4
5
6
5
5
5
March
5.9
6
6
6
6
April
6.0
5
7
6
6
May
5.9
6
6
6
6
June
5.5
5
6
6
6
July
5.7
5
6
6
6
August
5.6
6
6
6
6
September
5.3
5
6
5
5
October
5.2
5
5
5
5
November
4.5
4
5
4
5
December
4.2
4
4
4
4
Average
5.3
4.6
5.2
5.5
5.3
5.3
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°
208°
225°
206°
229°
February
205°
216°
227°
244°
226°
March
230°
230°
233°
226°
April
232°
236°
232°
226°
May
227°
232°
231°
231°
June
229°
228°
230°
231°
July
224°
229°
230°
231°
August
221°
229°
231°
230°
September
219°
227°
228°
226°
October
217°
231°
232°
229°
November
219°
228°
227°
234°
December
222°
231°
215°
246°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.