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
98.2
95
100
100
February
93.1
93
100
95
March
91.4
88
100
79
April
96.1
100
96
May
98.8
98
99
June
99.0
99
100
100
100
July
100.0
100
100
0
August
99.7
100
100
September
96.6
91
100
100
October
97.9
97
98
November
99.2
99
100
December
97.7
98
98
Average
97.8
91.9
98.1
97.0
100.0
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.