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
89.2
88
66
99
95
92
February
86.6
94
82
89
94
94
March
81.7
90
81
95
63
95
April
96.2
96
98
97
92
98
May
98.5
99
100
100
100
June
99.4
100
97
99
100
July
92.0
55
97
99
100
August
96.4
98
95
94
100
September
96.3
100
98
100
99
October
98.4
100
93
98
100
November
94.9
95
98
99
98
December
92.9
100
87
92
96
Average
93.4
92.0
89.1
95.6
93.8
97.8
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
4.3
5
-1
5
6
6
February
5.3
6
1
6
7
9
March
9.2
9
3
12
10
10
April
15.5
16
14
16
17
16
May
20.1
20
21
21
23
June
27.4
23
28
31
27
July
29.9
19
32
32
32
August
30.2
28
29
30
33
September
25.6
24
27
27
28
October
17.7
19
19
16
22
November
11.1
11
7
14
11
December
5.3
9
1
4
6
Average
15.9
9.0
14.0
17.5
17.8
18.3
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
-10.7
-8
-11
-11
-9
-8
February
-9.6
-5
-13
-9
-8
-9
March
-5.3
-4
-8
-3
-6
-4
April
-2.3
-2
-3
-2
-4
-1
May
1.6
3
-1
1
4
June
6.3
5
6
9
6
July
10.3
6
13
13
9
August
9.6
10
11
9
9
September
5.2
5
7
5
5
October
-3.7
-2
-1
0
-3
November
-7.8
-6
-8
-4
-7
December
-10.7
-7
-12
-9
-11
Average
-2.8
-5.2
-2.3
-1.5
-1.8
-1.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.2
14
28
1
5
4
February
9.2
11
12
13
10
0
March
11.2
19
21
7
8
6
April
4.7
8
3
5
2
4
May
4.2
6
2
1
1
June
1.4
5
2
1
1
July
1.6
2
2
2
1
August
2.6
5
7
1
0
September
1.7
3
2
1
0
October
2.8
1
7
6
0
November
4.1
9
5
0
2
December
5.3
0
17
11
4
Average
5.5
12.8
7.8
5.2
3.8
1.8
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
7.5
7
10
7
8
7
February
8.5
9
10
8
5
8
March
9.2
10
10
9
7
10
April
9.1
9
9
10
9
8
May
8.8
9
9
8
10
June
8.7
8
8
9
10
July
7.4
5
9
7
8
August
7.4
8
6
8
7
September
8.4
9
8
8
9
October
7.8
7
6
9
9
November
7.5
7
8
7
8
December
7.0
4
8
9
7
Average
8.2
8.6
7.9
8.2
7.8
8.3
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
208°
154°
265°
162°
240°
February
195°
188°
010°
282°
332°
March
203°
184°
276°
231°
181°
April
200°
222°
255°
315°
231°
May
178°
274°
231°
196°
June
194°
213°
194°
211°
July
209°
202°
202°
198°
August
191°
204°
198°
202°
September
192°
190°
208°
216°
October
200°
309°
198°
311°
November
197°
206°
215°
195°
December
212°
180°
191°
350°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.