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
87.1
83
91
89
84
82
February
78.0
88
75
84
74
80
March
86.5
74
85
88
85
88
April
90.7
89
91
89
95
May
95.8
92
96
93
97
June
96.5
97
96
96
94
July
97.4
98
94
98
98
August
97.7
98
94
97
99
September
97.4
97
98
98
94
October
94.3
95
94
97
November
90.8
86
87
99
December
81.2
94
71
68
Average
90.5
81.4
91.8
91.1
90.9
92.2
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
17.2
17
20
16
18
18
February
18.7
20
21
19
17
19
March
21.9
22
22
22
22
24
April
24.0
23
25
23
25
May
27.7
27
28
27
27
June
30.4
31
32
30
30
July
31.4
33
31
31
31
August
31.4
35
30
31
31
September
30.5
32
30
29
30
October
26.5
26
26
27
November
20.8
21
22
19
December
18.6
18
21
21
Average
24.4
19.4
25.9
25.2
24.8
25.9
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
6.9
6
10
5
8
9
February
9.4
9
11
8
7
9
March
11.7
13
12
10
13
14
April
13.8
15
14
14
14
May
17.6
14
19
18
18
June
21.9
20
21
23
22
July
21.0
24
20
23
10
August
20.8
23
21
24
8
September
20.6
22
18
21
17
October
15.8
16
14
18
November
9.3
10
11
8
December
9.4
9
12
14
Average
14.3
9.3
15.5
14.5
16.3
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
4.9
8
5
3
4
10
February
4.7
3
7
6
5
7
March
3.0
4
2
3
5
2
April
2.6
2
3
4
3
May
2.2
2
3
3
2
June
4.7
2
3
6
5
July
4.1
3
6
7
7
August
5.4
0
9
7
7
September
4.2
3
2
10
9
October
4.6
4
5
1
November
4.3
9
3
1
December
5.7
2
4
4
Average
4.3
5.1
3.2
4.0
5.0
5.4
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
7.6
9
7
7
7
8
February
7.7
7
8
8
7
8
March
8.0
8
8
9
8
8
April
8.2
8
9
7
8
May
7.5
7
8
8
8
June
6.9
9
6
7
8
July
5.8
6
6
5
7
August
5.8
8
5
6
7
September
5.8
6
6
5
6
October
7.2
7
7
6
November
6.4
6
7
5
December
6.8
7
6
6
Average
7.1
7.8
7.3
6.8
6.4
7.4
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
052°
208°
344°
228°
065°
February
181°
178°
086°
044°
186°
March
098°
157°
177°
115°
176°
April
124°
124°
103°
197°
May
143°
162°
119°
158°
June
225°
220°
148°
157°
July
239°
199°
205°
216°
August
232°
171°
161°
197°
September
100°
064°
122°
083°
October
067°
075°
104°
November
057°
044°
071°
December
039°
080°
171°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.