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
98.5
97
100
99
February
97.5
95
100
98
0
March
97.7
98
98
98
April
98.3
99
98
May
98.8
99
99
June
96.9
98
96
July
98.3
99
98
100
100
August
96.5
97
97
September
96.9
99
96
0
October
99.4
99
100
100
November
99.3
99
99
100
December
98.9
98
100
99
Average
98.7
96.7
98.4
97.9
99.2
100.0
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.