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
94.8
97
91
95
93
95
February
94.8
97
91
99
99
93
March
95.4
97
97
87
95
99
April
95.5
94
92
99
99
May
94.3
95
93
94
96
June
91.3
86
91
97
89
July
98.1
99
100
100
97
August
96.2
95
92
99
96
September
94.3
97
89
97
99
October
94.3
97
95
92
91
November
95.9
97
99
95
99
December
95.5
95
97
94
97
Average
95.2
97.1
94.5
93.9
96.2
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.