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
91.7
93
90
93
82
97
February
91.1
98
90
91
76
91
March
91.2
88
93
93
93
88
April
93.1
94
92
95
98
95
May
93.6
92
94
97
96
June
94.0
96
97
93
84
July
94.5
97
91
96
85
August
91.3
94
90
87
92
September
93.0
94
95
93
83
October
94.0
98
92
94
89
November
93.4
94
95
97
92
December
89.0
92
98
87
86
Average
92.3
93.2
93.8
93.3
91.8
90.1
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
14.2
15
17
13
13
16
February
17.5
17
20
18
14
16
March
19.9
22
20
22
20
21
April
23.9
24
25
24
24
23
May
27.0
26
29
28
25
June
29.9
29
31
30
29
July
32.0
33
32
31
33
August
31.2
32
31
31
32
September
28.4
28
29
28
27
October
24.4
24
23
25
26
November
18.7
19
20
18
21
December
15.9
17
15
19
14
Average
23.0
19.4
24.0
24.0
23.4
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
4.2
4
6
1
4
7
February
6.8
5
9
6
5
7
March
8.9
10
9
9
9
12
April
11.8
13
12
11
12
12
May
16.4
14
18
15
16
June
20.4
19
20
21
21
July
22.4
23
21
22
23
August
22.1
22
22
21
23
September
19.1
18
19
17
22
October
13.9
12
12
14
17
November
7.5
7
10
5
10
December
5.6
5
6
7
3
Average
12.7
7.7
12.9
13.1
12.7
13.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.9
2
4
4
5
4
February
5.2
3
3
1
16
9
March
3.2
3
3
3
3
6
April
3.7
4
4
3
1
4
May
3.2
4
1
1
5
June
4.0
3
2
5
9
July
3.7
4
4
3
3
August
4.5
4
5
5
12
September
3.4
3
3
5
10
October
1.8
2
0
2
1
November
2.9
3
2
1
4
December
5.6
4
2
5
6
Average
4.0
3.1
3.1
2.4
3.8
5.3
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
4.9
6
5
5
5
5
February
5.5
5
6
6
6
6
March
5.7
5
6
7
6
6
April
5.6
5
5
6
5
7
May
5.1
5
6
5
5
June
4.2
4
4
5
5
July
4.1
3
5
4
4
August
3.5
3
3
3
4
September
3.7
3
4
4
4
October
3.9
4
4
4
4
November
4.1
4
5
5
5
December
4.2
4
4
4
5
Average
4.6
5.4
4.3
4.8
4.6
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
236°
241°
326°
292°
227°
February
282°
232°
169°
331°
216°
March
005°
269°
209°
034°
236°
April
220°
187°
214°
245°
218°
May
020°
192°
208°
299°
June
210°
134°
189°
180°
July
201°
201°
194°
182°
August
205°
180°
171°
173°
September
358°
059°
111°
030°
October
355°
351°
284°
037°
November
008°
048°
343°
059°
December
324°
003°
240°
284°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.