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
89
88
97
99
99
February
93.0
93
92
100
98
99
March
91.0
92
82
95
100
93
April
92.2
76
96
97
96
May
89.7
80
94
93
91
June
83.2
88
77
83
87
July
84.3
80
81
85
83
August
86.8
80
88
90
81
September
92.1
95
99
85
80
October
93.7
92
90
95
91
November
94.4
98
95
83
96
December
92.5
96
85
84
99
Average
90.8
91.2
86.7
91.0
90.6
91.1
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
19.5
19
17
21
22
20
February
19.2
18
18
23
21
21
March
19.4
19
16
22
20
19
April
21.5
19
22
22
22
May
21.0
19
21
22
24
June
23.1
21
24
25
25
July
25.4
26
25
26
24
August
26.2
26
26
27
27
September
26.2
25
28
25
27
October
25.7
26
24
25
27
November
22.8
24
21
23
23
December
19.7
21
16
16
23
Average
22.0
18.8
21.5
22.8
22.7
23.3
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
8.5
8
7
8
9
7
February
7.7
9
6
7
8
8
March
8.9
10
7
8
8
10
April
11.0
10
10
11
13
May
12.5
13
11
14
14
June
15.2
14
15
16
16
July
16.8
16
17
19
15
August
17.2
17
15
17
18
September
16.5
17
17
16
16
October
13.6
13
14
13
15
November
10.2
10
8
11
9
December
8.3
9
7
7
8
Average
11.8
9.0
11.6
11.5
12.3
12.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.5
3
15
1
3
0
February
6.4
12
11
0
0
0
March
6.9
8
15
3
1
12
April
1.0
0
0
0
11
May
0.5
0
0
0
1
June
0.5
1
1
0
1
July
0.1
0
1
0
0
August
0.5
3
0
0
0
September
0.2
1
0
0
1
October
0.6
0
1
2
0
November
2.0
1
4
0
4
December
6.3
6
6
14
3
Average
3.2
7.4
4.0
1.1
1.4
2.6
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
8.4
6
9
9
10
7
February
7.9
6
9
10
8
9
March
7.3
7
7
7
8
7
April
6.8
6
8
7
6
May
6.4
6
7
7
7
June
5.7
5
6
6
6
July
5.7
5
6
6
5
August
5.7
5
6
6
5
September
5.6
5
6
5
4
October
7.1
7
6
7
6
November
7.4
8
8
7
7
December
7.7
6
6
6
9
Average
6.9
6.6
6.3
6.8
6.7
6.6
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
285°
161°
079°
065°
174°
February
198°
236°
054°
210°
082°
March
242°
248°
247°
249°
233°
April
244°
250°
242°
243°
May
232°
241°
242°
241°
June
237°
242°
241°
241°
July
240°
243°
246°
246°
August
238°
247°
243°
244°
September
238°
239°
242°
245°
October
227°
241°
236°
230°
November
082°
215°
097°
256°
December
091°
246°
250°
061°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.