Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
89.5
68
85
97
96
95
February
93.1
85
93
98
96
95
March
90.7
92
79
92
98
94
April
89.7
76
98
93
85
May
88.9
75
93
96
87
June
81.9
93
81
70
85
July
84.7
74
86
83
87
August
87.4
77
94
87
89
September
89.6
87
94
89
90
October
90.6
65
90
95
98
November
89.6
75
95
84
95
December
89.3
61
87
92
100
Average
88.2
81.5
78.2
91.8
89.7
91.2
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
17.8
15
16
19
19
18
February
17.4
16
16
20
18
19
March
17.5
17
16
19
17
17
April
19.2
17
20
19
19
May
18.9
18
19
19
21
June
20.7
20
21
20
22
July
23.2
24
22
22
23
August
24.4
25
25
24
25
September
24.4
24
26
23
26
October
23.4
23
22
22
25
November
21.0
23
19
21
20
December
17.5
14
16
16
19
Average
20.0
15.9
19.6
20.9
19.9
21.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
9.4
8
8
9
9
9
February
9.3
10
8
9
10
10
March
10.6
11
9
11
10
11
April
12.8
12
13
13
13
May
14.2
14
14
14
16
June
15.0
16
15
16
17
July
18.5
19
18
17
18
August
19.4
20
19
18
20
September
18.4
19
20
18
19
October
15.8
16
17
14
17
November
12.2
13
11
13
11
December
8.5
3
10
9
9
Average
13.2
9.6
13.0
14.0
13.3
14.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.2
9
19
2
3
0
February
6.6
17
9
2
1
2
March
5.9
8
13
2
3
9
April
2.1
1
0
1
11
May
1.7
3
0
1
0
June
0.3
1
0
1
1
July
0.1
0
0
0
0
August
0.7
3
0
1
0
September
0.8
2
3
0
0
October
0.4
0
0
3
0
November
2.5
1
5
0
2
December
4.5
2
14
8
1
Average
3.5
11.3
4.4
1.7
1.6
2.0
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
4.5
4
6
4
5
4
February
5.3
6
6
6
5
5
March
5.7
6
6
6
6
6
April
5.6
5
6
6
6
May
5.8
5
6
6
5
June
5.2
5
5
5
5
July
5.2
5
5
5
5
August
5.2
5
5
5
5
September
4.9
5
5
5
4
October
4.8
5
5
5
5
November
4.3
4
5
4
4
December
4.1
4
5
5
5
Average
5.1
5.3
5.0
5.3
5.1
4.9
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
232°
209°
239°
243°
240°
February
215°
234°
246°
252°
241°
March
230°
229°
231°
243°
239°
April
242°
245°
243°
229°
May
243°
233°
232°
242°
June
245°
236°
241°
239°
July
242°
243°
244°
245°
August
248°
247°
245°
242°
September
248°
245°
251°
252°
October
250°
240°
240°
246°
November
243°
225°
256°
251°
December
229°
229°
222°
224°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.