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
94.3
91
96
92
100
February
87.5
83
95
86
91
March
85.0
81
92
78
April
90.9
92
100
May
91.3
98
88
98
June
98.4
98
100
98
95
July
98.7
100
97
100
100
August
98.3
97
100
96
100
September
94.1
93
99
100
89
October
90.1
87
95
0
November
88.6
95
87
90
December
93.8
99
83
91
Average
92.4
85.1
96.1
93.8
95.1
94.4
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
2.3
0
3
4
2
February
-1.8
2
5
2
4
March
4.4
6
8
3
April
8.5
6
23
May
14.7
15
14
18
June
21.5
21
21
25
22
July
27.4
28
29
30
26
August
27.1
27
30
25
28
September
21.6
22
24
23
23
October
11.0
12
15
-3
November
4.8
9
0
10
December
2.0
8
-6
-1
Average
10.9
2.2
15.1
12.0
18.6
15.2
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
-8.3
-11
-6
-8
-8
February
-10.4
-7
-4
-9
-6
March
-7.8
-5
-4
-8
April
-1.2
-4
14
May
4.1
4
4
7
June
9.0
10
8
10
11
July
12.7
12
13
15
11
August
12.9
13
16
11
12
September
8.2
8
9
9
9
October
1.0
2
5
-5
November
-5.5
-1
-9
1
December
-8.7
-2
-15
-12
Average
-1.8
-8.4
3.8
0.2
5.5
3.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.8
14
8
16
5
February
18.7
21
6
19
13
March
13.9
14
10
19
April
17.8
18
0
May
12.8
6
20
6
June
6.2
6
8
5
13
July
2.0
1
3
3
2
August
3.2
4
2
6
2
September
5.1
7
7
0
5
October
11.9
14
8
100
November
14.0
4
20
3
December
13.0
2
36
22
Average
10.8
16.1
5.6
11.7
8.4
7.0
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
11.1
10
11
14
11
February
12.7
11
14
15
14
March
10.0
8
12
12
April
11.1
12
9
May
9.7
12
9
9
June
8.0
7
10
9
8
July
7.1
7
8
6
8
August
8.1
8
8
9
8
September
9.0
8
8
10
9
October
10.0
8
11
31
November
11.5
12
11
17
December
11.2
10
9
11
Average
10.0
9.6
9.1
11.0
9.2
9.8
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
253°
258°
263°
254°
February
261°
254°
287°
275°
March
313°
288°
297°
April
292°
217°
May
283°
291°
283°
June
293°
279°
308°
297°
July
302°
276°
360°
256°
August
242°
282°
296°
263°
September
264°
242°
264°
287°
October
273°
254°
360°
November
244°
272°
262°
December
223°
316°
268°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.