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
92.0
99
90
85
94
95
February
92.6
97
96
94
98
89
March
90.8
97
98
90
87
84
April
91.1
99
82
96
90
May
90.4
97
77
100
95
June
93.4
100
96
86
96
July
95.7
100
95
98
99
August
94.7
100
86
98
99
September
98.6
100
97
95
100
October
99.7
99
100
100
100
November
97.8
97
99
100
99
December
96.7
98
94
99
94
Average
94.5
97.2
97.8
90.8
95.8
95.3
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.