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
97.2
96
96
99
98
0
February
97.0
96
97
96
99
March
96.8
93
97
98
97
April
98.0
98
100
99
May
97.4
98
98
96
June
97.1
97
94
100
July
97.1
98
96
98
95
August
95.4
94
95
96
September
94.9
95
97
94
October
95.0
91
96
98
November
94.2
97
92
96
December
95.4
98
92
93
100
Average
96.1
95.0
96.2
96.2
96.8
95.3
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.