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
88.9
83
92
93
88
84
February
85.6
97
88
93
70
91
March
92.2
92
91
98
93
83
April
94.5
94
94
95
92
88
May
97.2
97
96
96
98
June
98.8
98
100
99
100
July
99.5
100
100
98
100
August
97.4
100
99
98
100
September
95.6
99
99
99
95
October
92.0
92
99
93
93
November
85.4
80
83
87
95
December
87.3
89
80
92
93
Average
92.9
91.7
93.9
93.9
92.1
93.1
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
16.0
14
18
17
15
17
February
18.1
21
19
17
14
17
March
23.2
23
23
24
23
24
April
27.5
28
28
30
25
27
May
30.4
30
33
29
33
June
35.0
37
36
34
34
July
35.7
38
37
34
37
August
35.1
38
34
33
37
September
31.4
35
32
33
29
October
25.7
26
26
29
27
November
20.0
19
18
21
22
December
17.5
17
18
23
17
Average
25.6
21.5
27.3
26.0
25.7
26.7
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
0.8
0
2
-1
1
3
February
2.7
5
2
-2
0
1
March
8.4
9
9
5
7
12
April
11.9
13
12
14
11
12
May
16.9
18
21
16
17
June
21.7
22
24
21
22
July
22.2
24
24
21
23
August
21.8
24
23
22
23
September
19.1
20
18
24
16
October
11.8
13
12
15
10
November
5.9
7
6
6
7
December
2.6
3
7
6
0
Average
11.3
6.4
13.0
11.5
12.1
12.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
2.7
3
2
1
5
4
February
1.9
1
2
1
5
1
March
1.0
1
1
0
0
4
April
1.3
1
0
1
1
2
May
1.5
3
0
3
1
June
0.4
1
0
1
2
July
0.8
0
1
2
1
August
1.4
1
2
3
0
September
3.6
2
0
0
6
October
4.7
4
2
1
1
November
3.6
6
5
1
0
December
3.5
3
4
0
4
Average
2.1
1.5
2.1
1.7
1.9
2.1
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
7.3
8
9
7
9
9
February
8.4
10
10
8
8
10
March
9.8
10
11
12
12
10
April
11.4
12
11
12
11
11
May
10.9
9
10
11
11
June
11.2
11
13
10
12
July
9.9
11
9
9
11
August
9.5
9
9
10
10
September
8.6
9
7
10
8
October
9.1
9
8
10
9
November
9.1
8
10
9
10
December
8.6
9
9
8
10
Average
9.5
9.9
9.5
9.5
9.9
10.0
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
237°
228°
252°
274°
225°
February
234°
222°
192°
194°
264°
March
207°
197°
215°
190°
190°
April
197°
195°
187°
180°
200°
May
179°
185°
164°
173°
June
191°
174°
174°
177°
July
173°
171°
169°
173°
August
167°
160°
174°
175°
September
175°
169°
175°
119°
October
160°
184°
207°
182°
November
191°
194°
183°
176°
December
220°
193°
214°
259°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.