Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km 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
98.1
90
97
97
99
February
90.5
92
71
99
86
March
95.3
97
96
95
99
80
April
94.3
95
94
99
73
May
95.1
96
98
100
68
June
88.7
99
57
97
0
July
81.9
91
24
100
86
August
97.2
95
98
98
95
September
98.6
99
99
98
96
October
99.4
99
99
99
November
78.4
95
0
December
74.2
88
19
Average
92.0
93.6
93.5
82.8
98.4
69.8
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.