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
95.3
98
91
96
94
96
February
94.9
80
93
100
99
99
March
93.3
100
96
88
89
97
April
96.3
93
99
98
99
May
93.9
89
98
95
92
June
90.7
92
82
90
92
July
89.8
91
84
97
84
August
87.7
77
94
94
88
September
94.8
93
96
91
95
October
93.6
100
89
87
100
November
98.3
96
98
100
100
December
97.0
88
100
99
99
Average
93.5
92.5
91.2
93.1
94.2
94.6
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.