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
85.0
88
81
92
February
88.5
89
88
89
88
March
87.5
87
87
90
87
April
94.9
98
96
88
100
May
83.5
89
77
June
98.4
98
99
98
100
July
93.8
92
97
94
91
August
96.7
100
99
97
100
September
95.6
96
95
98
October
93.4
95
98
95
November
91.9
95
94
94
December
93.7
92
88
99
Average
91.3
87.9
90.4
94.1
93.4
89.9
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
1.8
2
-1
3
February
4.5
8
2
3
5
March
8.7
11
6
10
9
April
14.2
13
15
18
9
May
13.8
11
17
June
27.0
23
27
27
29
July
29.1
28
31
30
27
August
28.4
28
30
30
27
September
25.4
25
27
27
October
15.3
17
17
17
November
9.9
11
6
13
December
5.2
7
2
8
Average
15.2
6.8
13.8
15.5
20.6
13.2
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
-8.4
-9
-7
-8
February
-7.3
-3
-8
-9
-5
March
-4.5
-3
-5
-4
-2
April
-1.3
-2
-2
3
1
May
3.2
2
5
June
12.6
13
11
13
29
July
15.1
14
16
15
17
August
13.7
14
15
13
19
September
10.0
9
11
10
October
1.7
2
4
3
November
-3.2
-2
-6
0
December
-6.9
-3
-8
-5
Average
3.0
-6.9
1.7
2.0
6.5
4.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.6
11
24
15
February
13.3
12
14
13
19
March
10.9
11
10
13
12
April
5.0
0
6
5
9
May
10.9
8
14
June
1.8
14
1
1
0
July
3.2
5
3
1
5
August
2.4
4
1
2
4
September
2.3
2
4
2
October
6.0
6
2
4
November
6.8
9
8
3
December
6.5
5
13
3
Average
7.6
11.2
9.7
6.7
3.8
11.6
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
12.1
11
12
14
February
13.4
12
13
14
15
March
12.7
12
12
14
15
April
15.6
13
18
10
13
May
11.2
12
10
June
9.5
8
10
9
14
July
8.2
7
9
9
9
August
9.1
9
9
9
7
September
10.1
10
10
10
October
12.0
10
11
13
November
12.5
12
13
13
December
14.3
15
15
15
Average
11.4
11.7
10.9
12.3
10.8
13.2
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°
306°
310°
February
296°
297°
301°
315°
March
276°
288°
321°
322°
April
296°
301°
290°
312°
May
293°
160°
June
032°
272°
050°
116°
July
297°
247°
013°
297°
August
308°
300°
277°
142°
September
322°
313°
308°
October
320°
316°
310°
November
308°
307°
297°
December
309°
301°
275°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.