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
91.7
99
82
91
February
87.3
94
74
85
March
93.3
96
97
98
95
82
April
93.0
96
96
88
91
May
96.2
98
98
90
99
June
97.0
93
98
97
95
July
98.5
98
100
96
98
August
98.5
100
96
99
100
September
93.0
97
100
99
89
October
93.6
95
96
98
91
November
90.3
97
94
91
93
December
90.8
95
81
100
94
Average
94.3
95.7
96.6
96.5
92.7
92.5
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
14.7
16
12
17
February
16.2
15
11
15
March
22.3
23
22
23
23
22
April
26.1
27
30
24
25
May
30.6
31
36
27
32
June
34.5
36
38
33
34
July
36.3
39
40
33
37
August
35.8
40
36
35
37
September
31.9
36
34
34
29
October
25.6
26
26
29
26
November
19.7
20
18
22
22
December
16.9
18
18
24
16
Average
26.0
22.8
30.3
27.8
25.6
25.9
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
2.4
1
3
5
February
2.9
0
0
3
March
8.7
10
8
7
7
11
April
11.6
12
13
11
11
May
17.4
17
20
16
18
June
21.0
22
23
21
19
July
23.1
24
24
22
24
August
23.2
25
23
22
24
September
19.9
22
20
20
17
October
12.9
14
13
15
12
November
7.4
8
6
9
9
December
4.7
6
7
8
3
Average
13.0
9.7
16.5
13.4
12.7
12.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
February
0.0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
10.2
10
10
9
February
9.7
9
7
9
March
11.3
10
13
12
13
9
April
11.6
11
13
12
10
May
10.7
8
13
10
10
June
9.6
9
11
8
10
July
8.3
9
9
7
9
August
8.3
9
7
9
9
September
7.8
8
8
8
8
October
9.4
9
8
10
10
November
10.1
9
10
10
11
December
9.6
10
10
11
11
Average
9.7
9.9
9.5
10.2
9.6
9.4
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
252°
285°
217°
February
276°
212°
228°
March
216°
210°
254°
176°
206°
April
201°
197°
143°
190°
May
160°
198°
121°
160°
June
168°
172°
151°
153°
July
177°
178°
155°
158°
August
159°
144°
160°
154°
September
183°
179°
152°
079°
October
176°
192°
186°
158°
November
219°
212°
197°
181°
December
208°
219°
216°
247°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.