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
91
83
96
97
94
February
92.9
84
89
98
97
98
March
91.5
78
98
97
93
April
96.0
89
100
98
95
May
95.3
91
99
99
86
June
96.2
96
97
96
98
July
96.4
94
97
96
94
August
95.9
93
99
94
98
September
95.9
99
97
95
89
October
95.4
94
96
97
94
November
92.3
100
96
77
95
December
92.6
94
92
77
97
Average
93.7
87.4
91.6
97.2
93.7
94.0
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
19.9
19
18
20
21
21
February
19.6
18
18
21
21
23
March
20.5
18
21
20
20
April
22.8
21
23
23
23
May
22.4
21
22
22
26
June
25.0
22
26
26
26
July
28.2
29
27
28
27
August
29.0
29
29
28
30
September
28.2
26
30
27
30
October
26.5
26
24
24
28
November
23.3
24
21
23
23
December
19.9
21
17
16
22
Average
23.2
18.7
22.7
23.7
23.3
24.8
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
9.7
10
9
9
10
11
February
9.9
11
9
8
10
11
March
11.4
10
12
10
12
April
13.6
13
13
14
15
May
14.8
15
14
15
16
June
17.0
16
17
17
18
July
18.8
19
17
19
18
August
19.3
19
19
18
20
September
18.3
19
19
17
17
October
15.2
15
16
14
17
November
12.0
12
9
12
11
December
9.6
12
9
8
9
Average
13.7
10.4
13.9
13.6
13.6
14.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.1
9
19
2
2
0
February
7.5
19
14
0
0
1
March
7.6
18
2
3
9
April
0.9
0
0
0
6
May
0.7
1
0
0
0
June
0.1
0
0
0
0
July
0.1
0
0
1
0
August
0.5
4
0
0
0
September
0.3
2
0
0
0
October
0.5
0
1
3
0
November
1.9
1
4
0
1
December
4.8
3
10
11
4
Average
3.7
14.1
5.1
1.1
1.5
1.7
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
1.7
2
2
1
2
2
February
2.0
2
2
2
2
2
March
2.3
3
2
3
3
April
2.0
2
2
2
2
May
1.8
2
2
2
2
June
1.6
1
2
2
2
July
1.6
1
2
2
2
August
1.6
1
2
1
1
September
1.6
1
2
1
1
October
1.5
1
1
2
1
November
1.4
1
2
1
2
December
1.5
1
2
2
2
Average
1.7
1.9
1.6
1.7
1.6
1.7
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
084°
098°
267°
249°
282°
February
116°
133°
262°
268°
280°
March
211°
260°
254°
252°
April
264°
257°
258°
252°
May
251°
258°
257°
255°
June
254°
255°
255°
253°
July
256°
253°
257°
257°
August
257°
253°
257°
257°
September
257°
247°
259°
261°
October
258°
252°
261°
262°
November
273°
272°
263°
261°
December
194°
160°
156°
286°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.