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
95.5
90
98
88
98
96
February
94.5
98
99
94
95
90
March
97.2
97
99
92
99
97
April
97.0
99
100
94
94
May
93.0
94
98
89
98
June
93.8
88
97
96
95
July
91.1
94
89
81
92
August
87.6
93
90
91
91
September
90.3
90
92
97
70
October
91.9
95
92
97
82
November
96.8
100
97
96
97
December
93.7
90
99
92
91
Average
93.6
95.2
94.5
93.7
93.3
91.1
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
9.1
8
9
8
9
11
February
8.4
10
8
8
8
10
March
11.2
11
10
11
11
11
April
14.0
15
12
14
15
May
15.9
16
14
15
17
June
18.5
17
17
21
18
July
19.4
19
19
18
19
August
20.8
21
21
20
21
September
18.9
18
19
18
19
October
14.7
15
16
14
14
November
11.0
11
9
12
11
December
8.5
10
5
6
10
Average
13.6
9.2
14.0
13.4
13.8
14.5
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
3.9
2
4
3
5
6
February
2.9
4
3
3
3
5
March
4.4
4
3
5
4
5
April
6.7
6
5
6
7
May
9.5
9
8
9
10
June
11.2
10
11
12
11
July
12.4
12
12
12
12
August
12.8
13
12
13
12
September
11.3
11
10
11
12
October
7.8
7
8
8
9
November
5.2
4
2
7
6
December
3.6
4
0
1
5
Average
7.2
3.4
7.1
6.7
7.6
8.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.6
21
12
9
14
31
February
14.9
11
7
8
23
19
March
10.1
12
8
10
7
11
April
9.9
8
8
7
9
May
7.1
3
14
4
9
June
6.8
4
9
6
10
July
2.3
1
2
1
7
August
2.8
2
2
4
5
September
6.7
4
2
12
8
October
10.9
7
10
18
7
November
14.2
4
11
28
15
December
14.2
12
6
18
14
Average
9.6
14.3
5.7
7.3
10.9
11.2
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
10.3
10
10
10
10
14
February
9.0
9
10
8
10
9
March
8.9
10
10
9
11
8
April
9.5
12
11
7
7
May
7.1
7
9
7
8
June
7.1
7
7
7
7
July
6.6
7
6
7
6
August
6.0
6
6
7
6
September
6.5
7
6
8
6
October
8.1
8
7
10
9
November
9.8
9
9
12
11
December
8.9
10
9
10
9
Average
8.2
9.5
8.2
8.0
8.6
8.0
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
133°
127°
153°
138°
151°
February
132°
180°
131°
226°
207°
March
158°
155°
180°
176°
222°
April
164°
189°
262°
263°
May
249°
214°
242°
232°
June
253°
237°
243°
232°
July
242°
249°
245°
244°
August
246°
252°
240°
245°
September
208°
236°
177°
243°
October
133°
193°
149°
215°
November
134°
164°
145°
157°
December
143°
095°
154°
133°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.