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
80.7
97
86
91
82
72
February
89.3
98
87
99
81
97
March
95.3
100
97
93
91
91
April
97.7
94
99
98
100
May
98.7
98
100
99
100
June
98.7
97
100
99
99
July
99.3
100
100
100
99
August
99.5
100
99
100
99
September
99.1
100
98
99
99
October
96.2
100
96
94
92
November
82.3
99
77
82
55
December
84.0
90
83
81
84
Average
94.9
98.6
96.0
95.8
93.6
92.6
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.