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
75.8
78
78
59
71
79
February
80.3
81
93
80
75
83
March
87.8
91
92
84
90
81
April
91.1
89
89
95
88
May
91.0
89
92
90
93
June
90.8
87
91
91
90
July
92.0
94
96
80
92
August
90.0
94
93
89
94
September
88.5
91
89
94
71
October
80.2
86
70
86
79
November
78.5
82
76
75
82
December
70.8
60
71
75
79
Average
85.2
83.8
86.6
83.6
84.9
84.9
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
7.8
8
9
7
8
8
February
7.7
10
8
9
7
9
March
11.0
12
11
12
10
10
April
14.0
13
13
16
15
May
18.8
22
16
17
19
June
21.7
23
21
24
20
July
25.1
27
26
25
23
August
25.2
27
27
24
24
September
21.1
22
23
20
22
October
14.9
16
19
13
15
November
9.8
10
9
10
10
December
7.2
10
6
5
8
Average
14.7
9.8
16.3
15.9
14.8
15.1
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
3.4
4
4
3
4
4
February
2.6
5
3
3
2
3
March
3.8
5
3
6
3
3
April
5.9
6
5
5
6
May
9.2
11
8
8
9
June
11.1
11
12
12
11
July
12.8
13
14
12
12
August
13.7
15
15
13
13
September
12.0
12
13
11
13
October
8.0
9
10
8
9
November
5.1
5
3
6
5
December
3.3
5
2
1
4
Average
7.2
4.4
8.0
7.9
7.0
7.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
20.2
29
17
15
20
31
February
17.9
20
14
12
21
8
March
15.3
13
12
15
13
14
April
15.3
23
12
6
6
May
8.0
4
20
6
9
June
6.3
5
10
8
9
July
1.1
1
1
0
0
August
1.3
3
1
0
2
September
6.9
9
2
9
7
October
10.5
14
7
13
6
November
17.7
11
22
28
18
December
19.4
23
13
23
17
Average
12.0
20.4
10.7
10.6
11.2
9.8
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
5.2
5
4
5
5
7
February
6.5
5
7
6
7
6
March
6.0
6
6
5
6
7
April
6.2
6
7
6
5
May
5.2
5
6
6
6
June
5.2
5
5
5
5
July
4.8
5
4
4
5
August
4.9
5
5
5
5
September
5.2
5
6
5
5
October
5.5
5
5
7
6
November
5.8
4
6
6
7
December
5.0
3
5
7
6
Average
5.4
5.4
5.1
5.2
5.7
5.9
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
213°
187°
203°
204°
204°
February
222°
206°
211°
216°
214°
March
202°
210°
231°
202°
213°
April
213°
221°
264°
229°
May
233°
220°
226°
252°
June
230°
237°
289°
211°
July
246°
238°
219°
224°
August
011°
306°
230°
212°
September
219°
019°
214°
035°
October
195°
199°
208°
224°
November
228°
223°
204°
209°
December
225°
018°
217°
205°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.