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
97.2
99
96
95
100
92
February
96.1
91
97
98
97
96
March
93.9
89
92
98
96
92
April
94.3
96
96
90
97
90
May
95.7
97
96
94
95
June
92.6
93
95
97
89
July
94.3
99
95
89
94
August
97.2
99
96
97
100
September
94.4
92
94
93
96
October
93.0
93
94
96
96
November
97.0
97
98
97
100
December
98.6
98
98
100
99
Average
95.1
93.5
95.7
95.1
95.7
94.6
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.