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
92.4
96
86
89
93
95
February
92.4
86
96
98
92
88
March
91.3
87
88
89
96
93
April
87.1
80
88
84
92
May
84.3
79
86
82
89
June
79.9
74
87
82
82
July
83.2
85
83
78
76
August
82.6
81
81
87
85
September
83.6
81
89
77
86
October
90.3
90
86
85
92
November
93.9
96
93
87
97
December
92.5
90
94
80
96
Average
87.7
89.3
84.8
88.3
84.9
88.6
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
16.4
18
15
19
19
18
February
18.0
17
17
21
20
21
March
18.7
18
16
22
18
17
April
22.2
21
23
22
21
May
23.3
22
25
23
26
June
27.2
23
30
28
28
July
30.6
32
30
30
29
August
30.7
30
31
29
32
September
29.5
27
31
29
32
October
26.9
28
25
22
30
November
22.9
24
20
25
23
December
17.6
20
15
16
21
Average
22.9
17.7
22.9
24.6
23.1
24.8
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
3.6
6
5
3
3
3
February
3.6
6
2
2
4
3
March
5.1
6
6
5
3
5
April
6.7
6
7
6
8
May
8.7
10
7
8
9
June
10.6
12
11
11
10
July
12.1
12
13
13
11
August
12.7
13
13
12
14
September
11.6
13
15
11
11
October
7.8
9
10
7
10
November
4.7
5
3
7
4
December
3.5
6
5
4
2
Average
7.3
6.0
8.3
7.8
7.1
7.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.7
4
15
2
10
1
February
6.5
13
7
1
0
1
March
7.9
13
15
3
4
13
April
3.0
4
2
1
12
May
2.0
8
1
0
0
June
1.1
8
0
0
0
July
0.6
5
0
0
0
August
1.0
6
1
0
0
September
1.0
4
1
1
1
October
0.8
4
0
2
0
November
2.9
4
4
3
1
December
6.2
12
6
14
3
Average
4.0
10.1
7.3
1.6
2.7
2.7
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
4.6
6
6
3
4
4
February
5.5
6
6
5
6
4
March
6.1
7
7
7
6
6
April
6.2
6
7
6
5
May
6.4
6
8
7
6
June
5.7
5
6
5
6
July
5.5
5
6
5
5
August
5.4
6
6
5
5
September
5.1
5
5
5
5
October
5.2
6
5
5
5
November
4.5
6
5
4
4
December
4.2
5
4
5
4
Average
5.5
6.2
5.6
5.6
5.3
5.0
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
287°
227°
263°
258°
283°
February
219°
273°
271°
288°
266°
March
281°
264°
280°
275°
225°
April
273°
271°
261°
264°
May
255°
267°
253°
262°
June
252°
261°
257°
256°
July
261°
265°
261°
255°
August
256°
266°
248°
254°
September
260°
245°
254°
255°
October
269°
259°
264°
254°
November
238°
270°
263°
261°
December
259°
252°
253°
277°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.