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
79.6
75
76
87
77
79
February
87.3
94
98
90
92
80
March
90.7
91
90
95
95
84
April
94.2
96
92
97
93
May
95.0
96
92
96
97
June
95.8
90
99
96
98
July
95.8
95
94
96
98
August
96.2
98
93
98
95
September
95.5
95
96
97
98
October
91.1
91
98
88
83
November
89.8
91
91
93
90
December
87.3
85
82
88
88
Average
91.4
86.8
92.0
92.9
93.4
91.0
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
3.8
3
7
2
3
6
February
7.6
11
12
6
1
5
March
11.9
15
12
14
15
13
April
17.3
18
16
18
16
May
23.3
23
25
22
21
June
27.5
26
29
28
29
July
29.4
29
29
28
32
August
28.2
27
28
30
28
September
26.0
26
25
26
26
October
19.3
19
19
21
18
November
11.0
13
12
11
15
December
7.1
10
6
11
6
Average
16.7
9.7
18.3
17.8
17.9
17.7
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
-4.4
-3
-1
-7
-2
-1
February
-3.7
0
-1
-5
-6
-3
March
1.2
4
0
2
1
4
April
5.7
5
5
6
5
May
12.0
10
13
10
11
June
16.4
14
16
18
17
July
19.2
19
20
19
20
August
17.8
17
18
20
18
September
14.9
14
14
15
13
October
8.5
8
6
12
8
November
1.1
1
2
0
3
December
-2.6
2
-1
1
-3
Average
6.6
0.1
7.5
7.1
7.9
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
19.5
25
23
16
20
17
February
12.2
7
7
18
14
16
March
11.3
5
14
18
5
11
April
9.7
8
17
11
9
May
7.9
11
8
9
9
June
6.7
5
3
7
3
July
5.3
5
10
5
3
August
5.0
4
5
2
4
September
4.8
4
3
7
2
October
8.0
9
3
8
11
November
9.6
9
14
8
9
December
9.8
12
8
10
13
Average
9.2
11.5
8.9
10.0
8.2
8.3
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
8.5
9
8
9
7
8
February
9.0
9
10
9
9
8
March
9.6
10
10
11
9
9
April
8.9
9
10
9
9
May
7.7
7
8
6
8
June
7.1
7
7
7
7
July
6.0
6
6
6
6
August
5.9
6
6
6
5
September
6.1
5
6
7
7
October
7.5
8
9
7
7
November
8.0
8
8
8
9
December
7.6
7
7
8
8
Average
7.8
9.2
7.6
8.0
7.2
7.4
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
234°
221°
254°
237°
227°
February
253°
224°
232°
318°
247°
March
234°
236°
234°
229°
245°
April
227°
224°
241°
254°
May
037°
181°
263°
215°
June
350°
241°
209°
239°
July
233°
247°
258°
255°
August
262°
223°
214°
277°
September
071°
278°
231°
190°
October
246°
223°
216°
209°
November
227°
220°
224°
230°
December
222°
200°
212°
232°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.