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
94.3
97
98
99
95
96
February
93.2
95
100
96
92
98
March
92.8
96
91
95
95
92
April
93.5
96
95
95
92
May
96.1
97
98
99
96
June
96.2
99
96
95
99
July
98.2
100
99
99
97
August
97.7
100
97
100
98
September
96.2
99
97
100
99
October
96.2
99
95
99
98
November
96.1
99
99
95
97
December
96.2
96
98
96
97
Average
95.6
95.5
97.7
96.9
96.7
96.4
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.