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
85.7
80
56
93
95
97
February
87.7
78
89
93
96
92
March
86.1
85
71
90
94
95
April
94.0
100
92
90
95
96
May
96.8
95
100
90
99
June
98.3
100
95
98
97
July
98.1
92
97
100
99
August
97.4
98
100
97
100
September
94.8
88
98
99
99
October
90.3
86
65
92
97
November
86.6
90
63
100
83
December
87.3
98
69
82
92
Average
91.8
86.0
87.7
89.3
95.0
95.8
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
-4.4
-5
-5
-5
2
-3
February
-4.9
4
-2
0
-5
3
March
5.0
5
-3
8
13
8
April
14.0
18
11
10
15
13
May
21.6
24
20
20
21
June
27.4
28
26
31
27
July
32.0
31
32
35
30
August
31.1
31
33
30
33
September
24.3
26
28
27
24
October
13.8
13
15
17
10
November
4.8
7
-1
9
7
December
-1.2
5
-10
-6
3
Average
12.8
5.1
13.8
14.0
15.8
14.7
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
-15.9
-16
-14
-16
-10
-12
February
-15.0
-7
-13
-13
-19
-11
March
-8.3
-7
-15
-6
-5
-5
April
-2.9
1
-2
-3
-2
-3
May
6.1
9
5
4
6
June
11.2
13
10
12
11
July
14.4
13
14
17
13
August
12.7
14
15
13
13
September
7.6
9
8
7
6
October
-1.9
0
2
2
-3
November
-7.0
-6
-11
-5
-7
December
-13.9
-9
-17
-18
-9
Average
-2.8
-8.8
-1.9
-1.7
-1.7
-1.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.4
5
8
4
6
4
February
10.1
16
6
8
3
8
March
8.8
17
22
5
4
6
April
6.7
3
15
13
5
4
May
5.2
6
6
7
4
June
4.5
2
8
2
10
July
1.3
1
1
1
2
August
2.3
4
1
4
0
September
5.9
3
4
2
1
October
5.8
11
10
7
3
November
6.1
0
19
2
5
December
8.3
0
37
13
1
Average
6.1
10.0
6.8
7.9
4.3
3.8
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
7.1
7
6
8
8
7
February
7.8
8
9
9
9
7
March
9.1
10
9
11
8
9
April
10.3
11
10
13
9
11
May
8.9
8
11
9
9
June
8.6
6
10
9
8
July
7.4
8
7
7
7
August
7.6
8
8
9
7
September
8.1
7
8
7
9
October
8.9
9
9
8
9
November
8.1
7
10
9
7
December
6.9
7
7
7
7
Average
8.4
9.1
7.8
9.4
8.1
8.0
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
278°
279°
291°
302°
295°
February
286°
311°
305°
288°
270°
March
031°
055°
306°
280°
298°
April
293°
354°
336°
314°
310°
May
062°
295°
048°
108°
June
080°
276°
336°
276°
July
298°
344°
074°
271°
August
327°
047°
338°
264°
September
058°
003°
272°
297°
October
341°
310°
284°
306°
November
275°
287°
276°
279°
December
277°
349°
327°
269°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.