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
87.9
87
89
91
85
83
February
81.3
89
88
79
72
84
March
89.3
84
90
88
86
87
April
93.8
93
91
93
94
98
May
93.7
93
92
97
96
June
93.3
95
93
93
98
July
95.8
97
94
97
96
August
95.8
98
96
96
98
September
95.5
96
97
90
92
October
93.0
97
89
96
92
November
91.4
88
88
98
94
December
80.8
88
74
79
86
Average
91.1
88.2
92.7
90.5
90.8
92.4
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
17.9
17
20
16
18
18
February
20.9
20
23
20
17
20
March
23.3
23
24
24
23
26
April
25.5
25
25
26
25
27
May
29.4
29
30
29
29
June
31.6
32
33
31
32
July
32.5
34
32
32
32
August
32.7
36
31
32
33
September
31.2
32
31
30
30
October
27.4
27
27
27
28
November
22.1
21
23
21
25
December
19.1
18
21
22
18
Average
25.6
21.1
26.7
26.1
25.6
26.3
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
6.7
5
9
5
7
9
February
10.2
8
12
7
8
9
March
11.9
12
13
11
13
16
April
13.5
13
15
13
14
15
May
17.0
18
18
16
17
June
21.7
21
23
22
22
July
22.7
23
23
23
22
August
23.1
24
23
24
24
September
20.8
21
20
21
20
October
15.9
14
12
17
18
November
10.0
10
11
8
14
December
8.7
7
11
13
5
Average
14.5
9.3
15.3
14.9
15.4
15.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.1
11
8
7
5
10
February
5.6
5
7
7
5
9
March
3.9
6
5
5
7
3
April
2.7
2
5
1
5
2
May
2.9
3
4
3
4
June
4.9
1
2
5
6
July
4.6
3
8
7
6
August
5.4
1
9
5
4
September
4.3
3
2
8
9
October
4.2
3
3
5
4
November
3.6
9
3
0
2
December
6.4
7
3
3
2
Average
4.6
5.7
4.4
4.5
4.7
4.9
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
7.4
8
6
7
7
8
February
7.8
7
8
9
8
8
March
8.2
7
8
8
8
8
April
7.6
8
7
8
8
7
May
6.3
5
6
8
7
June
5.3
5
5
6
6
July
4.5
4
4
4
5
August
4.8
5
5
5
5
September
6.0
6
7
5
7
October
6.7
7
6
6
7
November
6.9
7
7
6
8
December
6.8
7
6
6
7
Average
6.6
7.5
6.1
6.4
6.3
6.8
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
036°
201°
008°
348°
078°
February
131°
194°
143°
358°
181°
March
056°
200°
172°
153°
183°
April
171°
109°
162°
128°
340°
May
095°
159°
153°
149°
June
154°
005°
169°
160°
July
290°
184°
198°
101°
August
044°
222°
117°
163°
September
079°
009°
050°
062°
October
039°
032°
055°
048°
November
031°
030°
015°
032°
December
031°
039°
187°
022°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.