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
82.2
62
89
91
82
77
February
88.7
92
99
90
84
91
March
89.1
89
92
90
87
82
April
93.5
91
98
94
95
93
May
90.5
91
81
90
91
June
97.4
98
94
96
99
July
97.8
95
98
98
97
August
97.0
100
99
98
96
September
93.3
95
93
98
89
October
90.2
87
96
95
87
November
88.8
81
84
98
93
December
86.1
78
58
97
93
Average
90.8
83.1
91.9
89.6
93.4
90.8
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
7.4
4
9
9
7
8
February
10.0
16
11
10
3
9
March
16.1
18
14
16
18
16
April
20.9
23
22
22
20
21
May
25.1
26
26
22
23
June
31.4
31
32
31
33
July
33.3
33
36
32
33
August
32.3
35
35
33
32
September
29.7
31
31
31
27
October
21.2
22
23
23
19
November
14.3
15
13
16
17
December
10.4
11
9
15
10
Average
20.3
15.1
21.7
22.0
21.2
20.7
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
-4.8
-5
-2
-6
-2
-2
February
-3.8
3
-2
-4
-7
-2
March
4.1
6
3
2
6
6
April
8.2
11
8
9
8
7
May
14.1
15
15
13
13
June
19.7
19
20
19
21
July
21.5
22
21
21
22
August
19.5
22
14
22
20
September
17.6
18
17
18
15
October
9.3
10
10
11
8
November
2.9
4
2
4
5
December
-1.5
2
0
1
-1
Average
8.5
3.4
9.8
8.5
9.8
9.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.9
12
8
8
7
9
February
8.0
6
5
16
16
9
March
5.0
5
3
12
7
3
April
4.8
3
6
2
5
4
May
6.9
6
13
6
8
June
3.4
4
7
5
2
July
2.5
3
3
3
4
August
2.2
3
1
1
1
September
3.7
7
4
2
3
October
6.0
12
3
3
5
November
6.1
16
9
3
3
December
3.9
10
0
0
5
Average
5.1
6.6
6.6
6.7
4.5
4.4
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
9
9
11
11
11
February
11.4
12
12
13
11
11
March
12.9
14
14
14
14
11
April
13.3
14
14
15
14
12
May
10.8
10
13
12
10
June
10.5
8
10
10
13
July
8.7
9
8
9
9
August
8.8
8
7
11
9
September
9.8
9
8
11
10
October
10.9
12
7
11
12
November
11.2
10
12
12
13
December
10.0
11
9
11
9
Average
10.9
12.1
10.5
10.8
11.3
10.7
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
309°
298°
333°
320°
327°
February
252°
258°
337°
012°
342°
March
248°
314°
308°
208°
222°
April
231°
247°
212°
259°
240°
May
171°
150°
164°
082°
June
143°
172°
190°
196°
July
204°
172°
177°
176°
August
228°
170°
190°
166°
September
187°
182°
199°
200°
October
322°
305°
265°
229°
November
205°
288°
230°
221°
December
267°
226°
225°
298°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.