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
88.4
89
86
89
93
89
February
84.9
89
88
86
75
82
March
94.1
94
97
99
95
86
April
95.7
94
97
99
97
May
96.7
98
97
96
96
June
97.3
96
99
97
99
July
97.8
98
98
98
97
August
95.9
98
98
93
94
September
95.1
98
96
89
95
October
93.9
98
99
96
86
November
93.9
96
95
97
95
December
88.2
92
80
87
88
Average
93.6
90.9
95.2
95.3
93.2
92.6
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
10.0
8
13
9
10
11
February
13.4
16
16
13
9
12
March
18.0
19
18
19
19
19
April
21.4
22
22
21
21
May
26.5
25
28
25
25
June
30.1
29
32
30
30
July
31.7
32
33
31
33
August
30.8
31
31
31
31
September
28.7
29
28
27
27
October
22.8
23
22
23
22
November
15.7
18
17
15
18
December
13.5
14
13
17
12
Average
21.2
14.3
22.4
22.3
21.5
21.8
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
0.9
-2
4
-2
1
4
February
2.8
4
6
1
-1
3
March
6.6
8
6
6
7
9
April
9.2
10
10
9
8
May
15.4
15
17
13
14
June
19.7
18
20
20
19
July
22.0
22
23
22
22
August
21.0
21
21
22
21
September
17.8
17
16
17
17
October
11.5
12
8
14
12
November
3.6
5
5
2
5
December
3.3
3
5
6
0
Average
10.5
3.1
11.3
10.9
10.9
11.3
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
0
0
February
0.0
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
6.5
7
7
7
7
6
February
7.2
7
8
7
6
7
March
7.4
7
8
8
7
7
April
6.9
7
8
7
6
May
6.0
6
7
6
6
June
5.6
5
5
7
6
July
4.8
5
5
5
4
August
4.6
5
5
4
4
September
4.7
5
5
4
5
October
5.5
6
7
5
5
November
5.8
6
5
6
6
December
6.0
6
6
7
6
Average
6.0
7.0
5.9
6.2
5.8
5.7
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
240°
225°
300°
252°
227°
February
231°
225°
233°
321°
239°
March
208°
251°
219°
204°
229°
April
241°
219°
245°
282°
May
354°
205°
187°
215°
June
266°
275°
199°
221°
July
235°
213°
213°
227°
August
308°
204°
181°
295°
September
040°
012°
279°
354°
October
241°
224°
210°
271°
November
256°
250°
234°
227°
December
224°
207°
207°
228°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.