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
83.4
84
79
81
93
78
February
92.0
98
91
89
92
91
March
93.2
94
91
93
96
89
April
93.7
99
87
91
99
May
92.6
72
95
98
100
June
96.7
90
98
100
96
July
93.3
74
96
91
98
August
93.6
87
98
97
98
September
92.8
77
93
99
99
October
95.3
95
94
91
95
November
84.8
82
94
88
79
December
89.6
96
80
87
89
Average
92.2
91.9
85.4
92.5
94.0
93.5
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
-8.0
-13
-5
-7
-5
-12
February
-8.1
-2
-6
-6
-13
-3
March
-1.6
2
-3
1
1
-3
April
8.2
11
7
9
7
May
19.0
23
15
18
18
June
22.1
24
22
25
20
July
23.8
25
25
26
22
August
23.0
23
26
23
22
September
17.5
20
22
18
18
October
9.3
11
14
9
6
November
-2.2
3
-3
1
-2
December
-8.9
0
-14
-15
-4
Average
6.7
-5.4
10.5
9.3
8.1
7.3
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
-17.0
-21
-13
-20
-14
-22
February
-19.9
-12
-16
-16
-23
-15
March
-13.9
-11
-15
-9
-10
-15
April
-4.3
-2
-3
-4
-5
May
4.5
6
3
4
3
June
9.0
10
9
10
9
July
10.5
11
10
11
11
August
9.2
10
11
9
8
September
4.1
5
5
5
5
October
-2.2
-2
1
-2
-4
November
-11.8
-5
-12
-9
-11
December
-16.1
-10
-23
-24
-13
Average
-5.2
-15.0
-2.4
-3.1
-4.2
-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
26.5
27
12
31
19
33
February
26.0
16
24
27
24
20
March
15.7
12
12
21
15
22
April
12.2
6
22
15
4
May
9.7
9
15
13
12
June
10.5
6
11
7
19
July
8.0
7
3
5
16
August
8.6
10
12
10
6
September
7.8
6
8
10
2
October
11.1
8
7
9
24
November
19.9
9
25
5
22
December
22.2
3
44
34
24
Average
14.4
17.7
9.0
16.5
12.7
15.9
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
7.5
6
6
11
11
6
February
7.6
7
7
11
10
8
March
7.4
7
7
9
10
8
April
8.8
8
10
11
9
May
8.7
7
10
10
8
June
8.8
8
10
11
8
July
8.0
6
10
10
8
August
8.5
6
10
11
11
September
8.6
7
9
12
11
October
8.7
7
9
10
11
November
7.5
6
9
9
10
December
7.6
5
8
9
10
Average
8.0
6.5
6.8
9.6
10.4
8.9
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
344°
260°
295°
301°
300°
February
257°
272°
298°
293°
270°
March
159°
032°
286°
296°
314°
April
207°
347°
313°
274°
May
148°
296°
320°
033°
June
283°
301°
293°
252°
July
245°
252°
291°
251°
August
240°
254°
288°
264°
September
226°
248°
272°
303°
October
256°
245°
261°
308°
November
239°
286°
281°
290°
December
226°
334°
295°
292°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.