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
92.3
91
85
85
100
87
February
91.8
91
100
86
89
93
March
97.1
99
100
100
97
92
April
98.9
98
99
100
98
May
98.7
100
95
100
98
June
99.6
99
100
100
100
July
99.8
100
100
100
99
August
99.2
99
100
100
97
September
99.3
100
99
100
100
October
97.4
98
99
97
93
November
94.6
98
94
87
97
December
92.2
98
87
89
96
Average
96.2
93.6
97.7
95.3
96.4
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.