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
89.0
92
79
93
88
88
February
89.2
96
93
93
75
87
March
87.6
87
94
87
92
81
April
94.7
96
88
95
95
95
May
93.8
95
93
96
91
June
93.0
97
98
91
97
July
93.4
91
91
97
August
91.0
95
86
88
89
September
93.4
95
92
90
88
October
91.1
94
94
91
90
November
91.2
93
87
99
84
December
82.2
88
76
75
87
Average
90.9
92.7
91.8
90.6
89.6
89.8
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
15.0
14
17
14
14
17
February
18.8
18
21
19
16
17
March
21.5
21
21
22
22
23
April
22.7
25
26
24
24
24
May
23.9
28
29
28
27
June
23.8
31
31
31
30
July
32.2
34
31
33
August
31.3
33
30
32
32
September
28.1
29
29
29
28
October
22.7
24
24
25
26
November
19.6
19
20
18
22
December
16.1
16
16
20
14
Average
22.4
19.5
24.7
23.0
24.0
24.6
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
3.3
3
6
2
4
7
February
6.4
6
9
6
5
7
March
8.9
9
9
9
9
12
April
10.0
12
12
11
10
11
May
12.7
15
17
14
15
June
12.0
18
20
20
20
July
15.5
22
22
22
August
15.0
22
22
22
22
September
15.2
18
17
18
19
October
11.2
12
10
14
16
November
7.3
7
10
4
10
December
5.6
5
8
8
3
Average
9.6
7.5
12.8
11.2
12.6
13.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.7
3
10
6
11
9
February
7.9
8
6
4
12
14
March
6.2
11
5
7
5
10
April
2.7
1
5
3
2
3
May
3.9
3
3
2
4
June
4.5
3
1
5
1
July
2.0
2
2
2
August
4.0
5
9
3
2
September
2.8
3
2
6
5
October
3.9
5
1
4
2
November
5.1
8
9
0
4
December
8.5
7
6
6
8
Average
5.0
5.4
5.0
4.4
4.5
4.8
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
6.0
7
6
7
7
5
February
6.1
7
7
7
7
5
March
6.5
6
7
8
6
6
April
6.2
7
6
7
6
7
May
5.5
7
6
6
6
June
4.8
6
6
5
6
July
3.9
5
5
5
August
3.9
5
4
5
4
September
4.9
5
6
5
6
October
5.1
6
5
5
6
November
5.3
6
7
6
6
December
5.3
6
6
5
6
Average
5.3
6.7
5.8
6.1
5.6
5.7
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
274°
253°
288°
268°
274°
February
224°
245°
242°
302°
240°
March
288°
239°
250°
092°
231°
April
243°
262°
236°
260°
258°
May
005°
231°
226°
259°
June
299°
337°
186°
271°
July
264°
224°
243°
August
270°
288°
166°
208°
September
065°
029°
002°
046°
October
337°
348°
302°
063°
November
024°
024°
330°
032°
December
278°
003°
247°
277°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.