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
76.2
67
72
85
76
78
February
84.4
91
95
88
90
75
March
89.0
90
86
92
95
83
April
93.0
94
89
95
93
May
93.8
95
91
95
96
June
93.3
86
98
95
97
July
93.3
89
91
93
97
August
93.1
92
89
95
93
September
92.7
90
94
93
94
October
89.3
89
96
85
83
November
86.9
90
86
92
89
December
83.0
78
73
84
86
Average
88.8
83.0
88.1
89.9
91.1
89.3
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
3.2
2
6
1
2
6
February
5.7
10
3
5
0
4
March
11.1
14
11
13
14
12
April
16.6
18
15
17
15
May
22.7
22
24
21
20
June
26.8
26
29
27
28
July
28.5
28
29
28
30
August
27.2
26
27
29
27
September
23.3
10
24
26
25
October
16.2
0
19
21
17
November
10.2
12
12
10
14
December
6.3
8
5
10
5
Average
15.4
8.6
14.2
17.1
17.0
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
-5.5
-4
-2
-8
-3
-1
February
-3.1
-2
-2
-5
-8
-3
March
0.5
3
0
1
1
3
April
4.9
5
2
5
4
May
10.4
10
5
9
10
June
14.9
14
8
17
17
July
16.4
18
5
18
20
August
14.3
16
2
19
16
September
11.2
5
3
14
12
October
6.6
0
4
11
7
November
0.5
1
0
0
3
December
-2.2
1
-2
0
-3
Average
4.9
-2.8
5.4
1.5
7.1
7.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
26.6
41
30
22
19
24
February
18.5
9
9
29
23
25
March
16.5
11
22
21
6
15
April
11.2
8
17
12
10
May
9.3
12
9
10
11
June
6.5
7
2
8
4
July
4.5
5
5
5
6
August
3.4
4
2
3
4
September
5.2
4
3
8
3
October
8.9
11
5
8
10
November
11.6
11
15
9
13
December
16.5
20
19
11
15
Average
12.0
19.9
11.2
11.5
9.7
10.9
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
9.5
10
9
9
9
9
February
9.8
9
10
9
10
10
March
10.7
11
11
12
10
10
April
9.9
9
11
9
10
May
8.7
8
9
8
10
June
7.6
7
7
7
8
July
6.0
6
6
6
6
August
5.7
6
6
5
5
September
6.4
6
6
7
7
October
7.9
8
8
7
7
November
8.9
9
8
9
10
December
8.6
8
8
9
9
Average
8.4
10.1
7.9
8.2
7.9
8.1
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
243°
244°
268°
260°
237°
February
265°
236°
245°
316°
268°
March
251°
259°
248°
236°
251°
April
240°
235°
254°
270°
May
038°
182°
271°
217°
June
343°
257°
227°
249°
July
250°
248°
270°
260°
August
268°
262°
184°
279°
September
041°
308°
252°
172°
October
264°
246°
229°
233°
November
238°
237°
238°
240°
December
234°
218°
218°
247°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.