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
97.8
94
98
99
99
98
February
97.1
92
98
97
98
97
March
95.8
95
94
97
95
97
April
93.4
81
92
97
99
97
May
94.1
92
92
93
92
June
92.3
88
93
90
94
July
93.5
92
97
95
92
August
95.6
92
95
93
99
September
95.7
86
97
98
97
October
97.9
98
98
100
97
November
98.0
95
100
98
99
December
99.1
100
98
99
99
Average
95.8
90.3
93.7
96.6
96.5
96.7
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.