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
82.8
81
81
98
87
81
February
80.0
89
83
83
65
68
March
89.4
90
95
98
92
76
April
92.8
94
92
94
95
90
May
92.9
97
89
89
93
June
94.4
96
99
95
95
July
93.3
92
94
91
97
August
92.4
89
94
93
92
September
93.8
94
97
92
92
October
90.0
98
99
89
84
November
86.0
87
80
92
December
80.0
83
73
82
Average
89.8
88.6
91.1
92.5
89.7
88.3
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
7.6
6
12
3
8
6
February
12.4
14
15
12
8
11
March
16.3
17
19
17
17
17
April
19.5
21
20
20
19
18
May
24.2
23
25
23
22
June
27.2
26
29
27
27
July
28.9
29
30
29
29
August
28.2
28
28
29
28
September
26.2
26
25
25
25
October
20.7
20
20
21
21
November
13.6
15
9
17
December
10.2
11
11
9
Average
19.8
14.5
21.0
20.8
20.6
20.0
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
0.0
-2
4
-6
0
0
February
2.7
4
5
0
1
3
March
7.0
7
10
6
7
9
April
9.4
12
9
9
9
8
May
15.3
14
16
13
13
June
18.8
17
20
19
18
July
20.7
21
22
20
21
August
19.8
20
19
21
20
September
17.2
17
16
17
16
October
11.4
11
10
13
12
November
4.8
6
3
7
December
2.5
3
4
1
Average
11.0
5.1
12.2
11.3
12.1
11.4
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
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
December
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
6.6
7
8
6
7
6
February
7.1
7
8
7
7
8
March
7.4
7
9
8
7
7
April
6.9
7
7
7
7
6
May
5.4
6
6
5
5
June
5.1
5
5
5
5
July
4.2
4
5
4
3
August
3.9
4
4
4
4
September
4.2
4
5
4
4
October
4.8
5
6
5
5
November
5.8
6
4
6
December
6.0
6
6
7
Average
5.6
6.9
5.6
5.9
5.3
5.3
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
236°
234°
263°
244°
256°
February
250°
230°
236°
298°
240°
March
241°
226°
232°
235°
247°
April
235°
249°
236°
253°
266°
May
316°
230°
251°
246°
June
261°
323°
224°
247°
July
253°
246°
248°
282°
August
285°
247°
259°
275°
September
006°
346°
257°
339°
October
274°
252°
233°
261°
November
259°
023°
236°
December
227°
223°
238°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.