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
95.0
96
97
99
88
92
February
97.2
97
96
97
97
99
March
94.4
95
97
91
97
April
93.9
96
93
94
91
May
92.1
97
81
89
92
June
95.7
94
94
96
96
July
97.2
97
97
93
100
August
97.8
99
99
99
96
September
97.0
94
99
95
94
October
96.9
96
99
96
97
November
93.1
87
94
84
99
December
96.0
89
98
98
98
Average
95.6
96.5
94.7
95.5
93.4
95.9
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.