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
94.9
89
97
93
98
February
89.6
95
92
88
92
March
91.7
95
91
97
89
85
April
92.4
94
98
89
96
May
90.6
99
92
88
93
June
98.2
99
100
100
99
July
96.7
97
96
98
97
August
98.0
100
99
97
99
September
95.8
98
95
99
97
October
94.5
96
99
99
92
November
92.5
98
94
96
97
December
94.3
97
100
96
Average
94.3
93.2
97.3
96.4
94.9
95.0
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
4.5
3
4
5
6
February
5.2
8
6
0
5
March
10.7
12
7
12
9
11
April
15.0
9
16
13
15
May
18.9
20
20
18
20
June
27.0
23
29
29
28
July
30.6
29
32
31
30
August
29.4
30
31
30
32
September
26.1
27
28
27
25
October
15.8
18
18
18
15
November
11.2
11
7
14
13
December
6.2
8
8
7
Average
16.3
7.3
19.6
19.1
17.2
16.9
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
-9.9
-11
-6
-7
-7
February
-9.6
-6
-3
-12
-9
March
-4.0
-4
-6
-2
-5
-3
April
-2.3
-5
-3
-2
-3
May
4.4
7
4
5
5
June
9.5
10
10
11
10
July
12.8
12
14
13
13
August
11.5
12
13
11
12
September
7.0
7
8
7
6
October
-1.1
0
0
1
-2
November
-5.9
-5
-8
-2
-4
December
-7.1
-5
-5
-8
Average
0.6
-7.1
3.8
2.7
1.5
0.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.2
6
5
7
2
February
7.1
6
8
15
9
March
4.7
7
7
7
5
5
April
3.9
10
1
5
7
May
5.3
4
7
6
1
June
1.4
3
1
1
2
July
1.2
2
2
1
3
August
0.9
2
1
1
1
September
0.6
0
1
1
1
October
2.0
1
1
3
0
November
3.0
4
5
0
1
December
3.5
3
1
6
Average
3.2
6.0
2.7
3.0
3.5
3.1
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
10.5
8
11
11
13
February
10.0
10
12
10
12
March
10.4
9
12
12
9
11
April
11.4
11
16
10
10
May
8.9
8
10
9
10
June
7.5
7
8
7
8
July
7.0
7
7
7
8
August
7.1
7
7
7
8
September
7.6
8
7
8
9
October
9.8
8
9
10
10
November
9.7
10
10
11
10
December
10.7
12
13
12
Average
9.0
8.9
8.4
9.6
9.0
9.9
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
307°
308°
303°
294°
February
284°
303°
286°
305°
March
279°
298°
320°
304°
283°
April
037°
299°
325°
300°
May
199°
294°
095°
346°
June
147°
215°
078°
312°
July
338°
134°
082°
124°
August
295°
174°
259°
035°
September
331°
282°
317°
311°
October
321°
314°
309°
299°
November
305°
311°
296°
272°
December
309°
270°
311°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.