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
77.9
64
75
74
86
92
February
90.2
91
98
97
85
98
March
98.0
100
100
100
100
100
April
98.7
99
99
96
100
99
May
99.7
100
99
100
100
June
100.0
100
100
100
100
July
99.8
100
100
100
100
August
94.1
90
100
90
100
September
94.0
100
97
100
72
October
98.5
98
99
100
99
November
84.4
76
88
93
91
December
75.9
69
56
97
76
Average
93.0
89.2
92.4
93.8
96.2
94.2
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
6
4
8
10
February
8.2
11
9
11
7
13
March
14.5
17
13
17
16
15
April
19.6
20
18
16
22
22
May
26.4
29
23
26
26
June
30.3
31
29
34
30
July
35.5
36
36
37
35
August
34.4
34
37
34
34
September
27.5
27
29
28
29
October
19.3
20
22
20
21
November
10.1
9
7
13
11
December
4.9
6
0
6
6
Average
18.9
12.6
19.9
19.9
21.1
20.8
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
-2.3
-3
-2
-3
0
2
February
-3.8
1
-2
-3
-2
-1
March
1.2
1
1
4
1
2
April
4.9
5
4
4
4
4
May
10.2
12
10
9
10
June
13.5
13
14
16
13
July
15.4
16
16
17
15
August
15.3
16
17
15
15
September
11.1
12
12
11
11
October
4.9
5
7
6
5
November
1.0
1
-1
4
1
December
-1.1
1
-6
0
0
Average
5.5
1.0
6.4
6.4
6.8
6.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.8
11
10
6
9
10
February
9.6
11
7
4
10
5
March
4.6
4
2
7
1
2
April
4.5
2
5
11
1
1
May
3.8
1
8
2
6
June
2.6
1
6
1
5
July
0.2
0
0
1
0
August
1.3
5
0
1
1
September
2.3
3
1
4
1
October
4.0
5
3
4
3
November
6.3
5
10
6
6
December
6.6
9
10
8
4
Average
4.6
6.6
4.2
5.2
3.5
3.6
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
4.9
5
4
4
5
8
February
7.0
6
8
5
10
6
March
6.7
6
7
6
6
8
April
7.8
8
7
8
7
7
May
6.3
6
7
7
8
June
6.3
6
7
6
7
July
4.9
5
4
5
6
August
5.0
6
5
6
5
September
5.4
6
5
5
5
October
5.6
4
5
6
7
November
5.7
5
5
7
7
December
4.5
3
3
8
5
Average
5.9
6.3
5.4
5.6
6.3
6.4
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
265°
319°
267°
266°
220°
February
270°
243°
290°
247°
240°
March
231°
244°
232°
237°
239°
April
237°
226°
247°
276°
253°
May
216°
229°
244°
245°
June
236°
225°
252°
221°
July
259°
221°
217°
233°
August
260°
263°
243°
242°
September
250°
275°
240°
255°
October
279°
244°
233°
245°
November
261°
263°
231°
234°
December
277°
323°
248°
249°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.