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
88.4
83
95
70
90
70
February
76.3
72
74
85
82
85
March
90.2
96
100
68
70
81
April
91.7
89
100
100
100
May
98.9
99
100
97
100
June
98.0
98
100
97
100
July
94.0
93
100
100
67
August
97.1
100
92
94
100
September
96.0
99
90
100
100
October
94.5
91
96
100
100
November
98.3
99
99
90
98
December
95.7
96
99
78
97
Average
91.8
83.8
94.3
92.3
89.2
92.9
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.