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
91.1
77
92
100
94
84
February
91.5
93
100
93
84
96
March
91.9
96
96
96
87
82
April
94.6
99
91
98
94
99
May
92.4
94
92
91
91
June
97.1
97
96
96
99
July
97.5
96
96
96
99
August
96.3
99
99
0
97
September
93.3
93
98
91
October
92.5
96
100
100
89
November
92.3
91
95
94
96
December
93.4
92
87
99
88
Average
93.5
92.4
94.8
96.2
92.7
92.7
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
9.7
7
11
11
9
10
February
11.7
16
13
11
5
10
March
17.6
19
16
18
18
18
April
22.2
24
23
24
20
22
May
26.0
26
28
24
26
June
31.4
30
32
31
33
July
33.7
33
37
31
34
August
32.5
34
34
28
33
September
29.7
31
32
28
October
21.6
23
24
21
21
November
15.7
17
14
18
18
December
11.3
12
11
17
9
Average
21.0
16.2
22.3
23.2
19.2
21.8
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
-4.6
-5
-2
-6
-2
-2
February
-3.3
1
-3
-5
-7
-2
March
2.8
4
1
1
3
5
April
6.8
8
6
8
6
6
May
13.1
14
13
12
12
June
18.6
17
19
19
20
July
20.6
20
23
20
21
August
19.5
19
20
28
19
September
16.2
17
16
13
October
7.5
9
8
8
6
November
1.8
2
1
3
4
December
-2.6
0
-1
1
-3
Average
7.2
1.9
8.4
8.4
6.1
8.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.9
7
5
1
0
4
February
4.9
5
1
9
12
3
March
3.4
3
1
3
9
6
April
3.1
0
6
1
1
1
May
4.0
8
3
5
1
June
1.7
3
3
2
1
July
1.2
1
3
2
2
August
1.6
1
3
0
2
September
3.1
5
1
4
October
4.6
4
1
0
5
November
3.0
5
7
2
1
December
3.5
9
1
0
8
Average
3.1
3.1
3.8
2.9
3.5
2.9
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
9.5
8
9
10
11
9
February
10.4
11
12
11
8
11
March
11.7
11
12
12
13
11
April
12.8
13
12
15
13
12
May
10.4
9
12
11
10
June
10.4
8
12
9
14
July
8.3
8
10
8
8
August
8.0
7
7
0
9
September
9.4
8
9
9
October
10.1
10
9
16
10
November
10.1
9
12
9
11
December
9.7
10
10
10
9
Average
10.2
11.2
9.3
10.7
10.3
10.1
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
242°
277°
288°
299°
283°
February
246°
256°
309°
355°
302°
March
223°
230°
272°
207°
171°
April
201°
209°
207°
203°
231°
May
141°
156°
140°
102°
June
144°
173°
172°
184°
July
185°
161°
163°
137°
August
157°
175°
360°
147°
September
161°
173°
200°
October
204°
214°
334°
197°
November
215°
214°
244°
203°
December
259°
236°
224°
292°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.