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
95.9
98
93
96
99
February
92.7
92
91
97
100
92
March
94.5
94
91
95
99
April
96.7
96
97
100
96
May
98.9
99
100
98
June
99.5
98
100
100
July
99.8
100
100
100
100
August
99.1
100
99
0
100
September
99.1
100
100
0
99
October
96.9
94
97
96
November
94.4
95
94
100
100
December
94.4
100
88
94
98
Average
96.2
94.6
95.7
97.3
93.7
98.1
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
1.2
-1
-1
3
4
February
1.1
4
0
4
-21
1
March
7.9
10
3
10
10
April
12.6
13
12
9
13
May
19.3
22
18
21
June
25.1
23
26
27
July
31.6
30
33
30
32
August
29.8
30
32
21
32
September
22.8
25
27
15
25
October
13.9
15
17
14
November
6.6
9
3
11
10
December
2.0
4
-2
3
4
Average
11.0
4.3
14.3
15.8
4.7
16.0
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
-11.0
-13
-12
-11
-9
February
-13.9
-7
-14
-13
-21
-12
March
-6.6
-3
-9
-6
-5
April
-3.9
-2
-4
9
-3
May
5.3
6
4
5
June
9.3
10
8
10
July
12.9
12
13
30
12
August
12.0
13
13
21
13
September
6.0
8
9
15
6
October
-2.6
0
1
-2
November
-7.4
-5
-10
11
-7
December
-11.6
-8
-14
-10
-9
Average
-2.0
-8.2
0.0
-1.5
-6.7
-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
4.3
1
7
5
3
February
7.6
9
8
3
0
9
March
7.0
7
11
7
4
April
6.7
6
5
0
9
May
4.0
4
6
1
June
2.3
6
0
4
July
0.7
1
1
0
0
August
0.9
0
1
0
1
September
1.6
2
1
0
1
October
4.3
9
3
0
November
4.7
5
6
0
0
December
4.1
1
9
5
0
Average
4.2
5.7
5.5
3.5
5.2
2.4
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
4.2
3
4
6
4
February
5.2
5
6
6
0
5
March
6.7
7
6
6
7
April
7.8
8
9
4
6
May
7.4
7
8
8
June
6.6
5
7
7
July
6.2
5
6
7
7
August
5.6
7
5
0
6
September
6.1
5
7
0
6
October
5.3
4
5
7
November
5.1
5
5
0
6
December
4.0
3
6
8
4
Average
5.5
4.9
5.5
6.2
7.7
6.2
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
128°
251°
269°
212°
February
220°
280°
342°
360°
264°
March
271°
177°
323°
201°
April
206°
274°
180°
003°
May
338°
297°
234°
June
247°
180°
202°
July
014°
156°
116°
217°
August
221°
063°
360°
040°
September
138°
157°
360°
050°
October
051°
050°
301°
November
247°
186°
360°
188°
December
280°
233°
221°
202°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.