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
74.4
66
53
96
60
76
February
87.0
96
87
91
89
92
March
88.3
92
82
88
91
84
April
86.0
85
83
87
89
May
93.0
93
97
89
97
June
95.3
94
97
98
97
July
93.3
95
92
92
92
August
91.9
95
86
93
97
September
88.4
84
90
93
93
October
88.0
88
99
85
91
November
86.9
93
81
98
87
December
74.3
62
77
76
84
Average
87.7
85.0
85.8
90.4
88.3
90.4
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
-5.1
-3
-3
-7
-4
-4
February
-3.1
5
-2
-5
-8
-3
March
3.3
7
2
3
7
4
April
9.7
9
9
11
11
May
18.7
21
20
18
17
June
24.5
26
26
26
24
July
25.6
25
26
26
26
August
23.9
27
25
24
24
September
20.6
23
21
21
18
October
11.8
14
15
15
8
November
3.4
7
5
6
6
December
-2.5
4
-2
0
-2
Average
9.9
2.9
12.6
11.8
11.9
10.8
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
-13.7
-8
-9
-17
-11
-11
February
-13.0
-5
-12
-15
-18
-14
March
-6.6
-2
-7
-5
-3
-3
April
0.0
1
1
1
0
May
7.4
9
9
7
7
June
12.9
13
14
14
13
July
14.5
13
16
14
15
August
13.6
15
15
14
14
September
10.2
13
11
9
8
October
3.4
6
4
7
0
November
-4.3
-2
-2
-2
-2
December
-9.2
-2
-8
-10
-9
Average
0.7
-5.0
3.2
2.2
1.9
1.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.4
7
21
6
9
16
February
10.9
2
13
15
10
8
March
9.7
10
17
12
7
12
April
13.9
17
21
14
11
May
7.0
2
6
9
7
June
4.1
2
6
2
2
July
3.0
1
3
3
4
August
4.2
1
6
5
3
September
5.2
7
2
3
3
October
9.7
9
5
7
10
November
9.6
4
19
4
7
December
14.1
5
15
15
13
Average
8.1
6.6
7.5
9.5
7.0
7.5
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
6.8
7
6
8
5
7
February
7.7
8
7
9
8
8
March
8.0
9
8
8
9
8
April
8.8
10
10
8
9
May
7.6
7
9
8
8
June
7.3
6
9
7
8
July
5.4
6
6
5
5
August
5.9
6
6
6
7
September
6.5
6
7
7
7
October
7.5
8
8
7
8
November
8.0
8
8
9
9
December
6.7
7
6
8
7
Average
7.3
7.9
7.0
8.0
7.1
7.5
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
271°
308°
249°
271°
259°
February
259°
272°
280°
263°
269°
March
311°
360°
317°
231°
279°
April
297°
233°
303°
310°
May
142°
190°
210°
006°
June
077°
235°
251°
169°
July
282°
253°
242°
224°
August
262°
198°
212°
236°
September
140°
228°
238°
254°
October
304°
247°
249°
264°
November
244°
269°
273°
230°
December
217°
141°
228°
260°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.