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
89.3
92
83
93
79
92
February
88.8
97
92
92
70
90
March
91.2
87
92
94
90
90
April
94.2
91
98
99
96
May
91.7
92
93
99
83
June
94.1
96
97
91
90
July
93.7
95
90
92
94
August
93.1
94
98
91
88
September
92.5
94
95
97
87
October
91.9
94
94
93
87
November
90.7
90
95
99
88
December
88.9
92
87
87
88
Average
91.5
91.8
92.7
94.2
91.1
89.5
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
12.7
14
15
11
11
15
February
15.7
16
18
16
12
15
March
19.1
20
19
20
20
20
April
23.1
24
24
23
23
May
25.7
24
28
26
24
June
29.7
29
31
30
29
July
31.9
32
32
31
33
August
31.4
32
31
31
32
September
28.6
28
28
29
27
October
24.0
24
22
25
24
November
17.1
18
19
17
19
December
14.4
16
13
18
13
Average
21.8
16.6
23.2
23.2
22.6
22.7
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
1.5
2
4
-1
1
4
February
4.0
3
7
3
2
5
March
6.5
7
6
7
7
9
April
9.6
10
9
9
9
May
14.1
13
16
12
14
June
18.9
16
19
20
20
July
21.5
22
22
21
22
August
20.9
21
20
21
21
September
17.1
17
16
16
15
October
11.7
10
9
13
13
November
4.7
3
7
2
8
December
3.0
3
3
4
2
Average
10.1
3.8
10.9
11.0
10.7
11.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.3
8
9
7
14
6
February
9.8
6
10
7
18
10
March
7.7
10
10
5
6
6
April
7.5
12
4
3
7
May
5.9
7
2
4
10
June
4.9
6
1
6
6
July
2.7
2
3
5
2
August
3.7
3
4
6
3
September
5.9
6
5
3
10
October
5.1
5
2
5
7
November
6.5
5
5
5
6
December
9.0
6
9
6
10
Average
6.5
8.0
6.3
4.2
6.3
6.6
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
4.4
5
4
5
3
5
February
5.2
6
5
5
5
5
March
5.2
5
5
6
5
5
April
4.9
5
5
4
5
May
4.8
6
5
4
4
June
3.5
4
3
3
4
July
3.3
3
4
3
3
August
2.9
4
3
3
2
September
3.6
4
4
3
4
October
3.4
4
4
3
3
November
3.8
4
4
4
3
December
3.6
4
3
4
4
Average
4.1
5.6
4.2
4.1
3.6
3.9
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
262°
249°
326°
310°
300°
February
284°
246°
224°
342°
245°
March
334°
277°
231°
359°
234°
April
205°
242°
276°
260°
May
021°
341°
297°
320°
June
248°
355°
210°
204°
July
216°
212°
199°
216°
August
241°
205°
180°
202°
September
009°
028°
347°
024°
October
334°
009°
313°
024°
November
010°
032°
350°
276°
December
274°
015°
246°
285°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.