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
97.6
100
67
98
95
February
97.0
100
100
95
96
March
98.0
98
99
96
99
April
93.2
100
84
100
May
92.9
99
79
100
June
88.9
99
81
100
July
82.8
99
78
93
August
76.9
98
100
74
100
September
81.9
100
100
78
81
October
94.9
100
100
81
100
November
93.3
100
96
77
84
December
95.4
100
99
100
93
Average
93.5
99.2
99.4
96.7
84.3
94.2
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.