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
86.5
70
93
94
85
82
February
83.7
91
90
90
79
90
March
91.5
93
89
97
95
81
April
92.9
96
99
95
94
87
May
91.3
100
88
83
90
June
96.6
98
98
91
99
July
97.9
97
99
99
96
August
96.3
100
97
97
96
September
93.0
97
100
97
86
October
90.1
90
97
94
82
November
89.9
91
83
96
92
December
86.6
89
65
96
87
Average
91.4
88.2
94.0
93.2
92.3
89.2
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
10.8
9
13
12
10
12
February
12.8
19
14
12
6
12
March
18.7
21
16
19
19
20
April
22.6
25
25
24
21
22
May
25.9
27
27
24
25
June
30.9
32
32
30
32
July
33.6
34
37
32
33
August
33.2
36
35
33
33
September
30.3
32
32
32
27
October
22.9
24
24
24
22
November
17.0
19
14
18
19
December
13.1
15
11
19
13
Average
22.1
18.3
23.8
23.6
22.4
22.3
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
-1.0
-3
1
-4
0
1
February
0.7
6
2
-2
-4
1
March
6.2
9
5
4
7
8
April
9.7
12
10
10
9
9
May
15.2
18
16
14
15
June
18.2
21
20
20
20
July
21.1
23
24
21
23
August
21.3
23
21
22
20
September
18.2
20
18
18
15
October
10.6
12
10
13
9
November
4.5
6
4
5
7
December
2.0
4
3
5
0
Average
10.0
5.8
11.7
10.7
10.8
10.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.0
7
7
4
5
9
February
6.9
8
7
8
13
8
March
3.0
4
4
2
4
5
April
3.2
2
0
3
4
2
May
5.0
6
6
12
7
June
1.8
2
1
3
1
July
1.0
1
3
1
2
August
3.2
1
3
2
1
September
3.7
2
2
1
6
October
6.7
8
4
2
6
November
3.3
5
8
0
3
December
3.4
1
3
2
10
Average
3.9
5.0
3.5
3.6
4.0
4.7
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
9.0
7
9
10
9
9
February
9.7
10
10
10
9
9
March
10.6
10
11
12
11
9
April
11.3
12
12
13
11
10
May
9.3
5
11
9
9
June
8.0
4
9
8
10
July
6.7
4
8
6
8
August
7.0
5
8
8
7
September
7.4
7
7
8
6
October
8.8
9
8
9
9
November
9.0
8
9
10
10
December
8.5
9
8
9
8
Average
8.9
9.7
7.5
9.4
8.8
8.6
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
291°
243°
308°
310°
211°
February
230°
229°
279°
012°
305°
March
201°
215°
223°
189°
174°
April
189°
186°
182°
182°
204°
May
151°
167°
134°
129°
June
154°
168°
170°
187°
July
189°
181°
185°
160°
August
119°
165°
181°
149°
September
152°
181°
180°
138°
October
194°
211°
211°
167°
November
188°
184°
199°
192°
December
224°
225°
201°
272°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.