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
98.8
96
100
100
99
100
February
96.1
91
95
99
97
98
March
98.0
95
99
98
99
100
April
99.4
99
100
100
100
May
99.6
100
100
100
99
June
99.1
100
98
99
100
July
99.3
100
99
100
100
August
98.4
96
96
99
100
September
98.9
97
99
100
99
October
99.0
100
98
99
98
November
97.1
98
96
100
92
December
96.4
91
93
100
100
Average
98.0
93.7
97.8
98.1
99.2
98.6
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
13.5
13
14
14
13
14
February
16.3
17
15
15
16
15
March
21.0
20
20
21
21
21
April
26.3
26
28
25
26
May
31.0
31
33
31
32
June
35.4
35
35
35
36
July
36.1
39
36
33
37
August
34.6
36
32
32
37
September
31.4
33
30
31
30
October
24.2
25
23
26
24
November
19.0
19
16
20
21
December
14.2
15
14
17
13
Average
24.3
16.7
25.5
24.8
25.1
25.6
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
-2.6
-1
-1
-3
-2
0
February
1.1
2
-1
-2
0
1
March
5.0
6
5
3
4
7
April
9.1
8
10
9
10
May
13.7
14
14
15
14
June
18.7
19
20
20
18
July
20.7
23
18
21
23
August
19.8
19
21
20
21
September
15.8
16
17
15
14
October
9.1
9
10
9
6
November
2.3
4
0
3
1
December
-1.5
-2
0
2
-3
Average
8.6
2.4
9.4
9.0
9.6
9.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.3
5
3
1
0
2
February
3.2
5
3
2
5
5
March
2.3
2
3
5
0
5
April
0.4
0
0
2
0
May
0.0
0
0
0
0
June
1.8
1
4
5
0
July
0.9
1
1
0
0
August
2.6
4
7
2
1
September
2.1
5
1
2
1
October
2.2
1
4
0
4
November
1.3
3
1
1
0
December
1.9
3
5
1
0
Average
1.9
3.8
2.2
2.6
1.4
1.4
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
6.2
7
8
6
5
6
February
8.0
9
10
7
7
6
March
8.6
10
10
8
9
8
April
9.1
10
10
8
9
May
8.5
8
10
9
8
June
7.3
9
7
7
8
July
6.2
7
7
6
6
August
5.6
7
6
6
5
September
5.5
6
5
5
5
October
6.3
7
6
7
5
November
5.2
5
6
4
5
December
5.6
6
6
7
5
Average
7.1
8.7
7.6
7.1
6.6
6.5
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
189°
203°
227°
280°
339°
February
215°
217°
186°
211°
186°
March
204°
206°
221°
213°
184°
April
214°
211°
200°
215°
May
199°
212°
196°
214°
June
217°
210°
192°
198°
July
174°
130°
158°
212°
August
187°
138°
173°
219°
September
170°
180°
207°
264°
October
171°
247°
213°
182°
November
202°
199°
189°
210°
December
260°
208°
183°
195°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.