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
81.0
92
86
81
78
77
February
89.7
84
90
96
94
98
March
94.8
96
98
95
96
93
April
96.4
96
95
97
98
May
95.6
92
99
98
99
June
95.7
98
98
95
99
July
98.3
98
99
96
100
August
98.1
97
100
99
100
September
96.9
98
98
95
98
October
93.3
94
94
93
95
November
86.2
88
88
81
91
December
82.3
88
73
77
89
Average
93.1
90.9
94.2
94.7
92.9
95.6
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.