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
94.2
95
91
96
98
96
February
94.3
81
94
100
98
99
March
94.9
95
87
98
99
97
April
96.0
92
99
100
90
May
97.9
95
100
100
99
June
98.8
98
100
100
98
July
98.8
98
99
98
99
August
99.2
98
100
100
100
September
97.1
98
100
98
86
October
96.2
98
97
96
92
November
93.8
100
97
77
94
December
94.0
98
98
76
97
Average
95.8
90.9
95.4
98.6
95.4
95.6
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
19.8
19
17
21
21
20
February
20.1
18
18
23
22
23
March
21.1
20
18
24
20
19
April
24.3
23
25
25
23
May
24.3
22
26
25
28
June
28.0
24
31
29
28
July
31.9
33
31
32
30
August
32.6
32
33
32
33
September
31.1
28
33
31
33
October
28.2
29
27
26
30
November
24.4
25
23
26
24
December
20.0
21
17
17
22
Average
24.8
19.1
24.1
26.4
25.3
26.0
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
9.2
9
8
9
9
9
February
10.0
11
8
10
10
10
March
11.6
12
10
12
10
11
April
14.5
12
15
14
15
May
16.2
14
16
17
18
June
18.6
16
20
19
19
July
21.1
21
20
21
19
August
21.0
21
21
21
21
September
19.7
19
22
18
20
October
16.1
16
17
15
17
November
12.8
13
10
14
12
December
9.6
10
8
9
9
Average
14.5
10.4
13.9
15.2
14.6
14.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.3
0
3
0
2
0
February
4.2
10
6
0
0
0
March
3.8
3
9
2
1
6
April
1.3
0
0
0
11
May
0.4
0
0
1
1
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.5
3
0
0
0
September
0.2
0
1
0
0
October
0.1
0
0
0
0
November
0.7
0
0
0
1
December
2.7
0
1
11
2
Average
1.7
4.0
1.7
0.2
1.0
1.6
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
3.0
3
4
3
3
3
February
3.9
4
4
3
3
4
March
4.4
5
5
5
5
5
April
4.6
5
5
5
4
May
5.1
5
5
5
5
June
4.9
4
5
6
4
July
5.7
5
7
5
4
August
4.8
5
5
5
5
September
4.1
4
5
4
3
October
3.6
3
4
4
4
November
3.1
3
4
3
3
December
2.7
2
3
3
3
Average
4.1
4.0
4.1
4.6
4.3
3.8
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
210°
175°
159°
176°
201°
February
164°
168°
209°
209°
198°
March
184°
187°
204°
198°
197°
April
208°
208°
200°
190°
May
199°
205°
207°
206°
June
205°
206°
203°
202°
July
205°
213°
206°
204°
August
204°
206°
204°
204°
September
206°
202°
208°
205°
October
203°
206°
206°
208°
November
190°
205°
202°
201°
December
170°
173°
180°
185°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.