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
96.3
97
94
99
94
99
February
95.5
96
99
100
86
88
March
97.1
98
99
99
99
93
April
98.4
100
99
95
98
May
99.1
100
100
98
100
June
96.2
99
99
78
99
July
85.5
100
100
0
100
August
96.7
100
98
81
100
September
96.9
99
98
100
99
October
94.9
94
96
98
97
November
91.7
91
93
96
95
December
95.0
91
96
99
99
Average
95.5
96.8
97.3
98.1
84.4
97.4
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
14.5
14
15
15
14
16
February
17.6
19
16
16
15
16
March
22.0
22
22
22
22
21
April
27.0
26
29
24
27
May
31.7
31
34
30
33
June
35.6
37
35
35
36
July
35.7
38
37
32
38
August
34.4
36
33
32
37
September
31.4
34
31
32
31
October
25.0
26
23
27
27
November
18.9
19
16
21
21
December
15.6
16
16
20
15
Average
24.9
18.1
26.3
25.8
25.4
26.4
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
-1.0
-1
1
-3
-2
0
February
0.8
3
1
-3
-1
1
March
5.3
7
5
2
5
8
April
8.9
7
9
8
9
May
14.5
14
15
15
15
June
19.3
20
20
20
19
July
21.7
23
22
20
23
August
21.1
22
21
20
22
September
17.0
18
17
16
15
October
10.0
11
10
10
8
November
4.0
5
3
4
4
December
0.6
1
2
4
-2
Average
9.3
2.7
10.5
10.0
9.9
10.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.6
0
1
0
1
1
February
1.6
3
0
1
5
3
March
1.2
2
0
1
1
6
April
0.8
0
0
4
0
May
0.1
0
0
0
0
June
1.1
1
1
5
1
July
0.3
0
0
1
0
August
0.8
1
2
1
0
September
1.4
1
0
2
0
October
1.5
2
2
0
2
November
1.2
3
3
0
2
December
0.8
2
0
0
0
Average
1.0
1.5
0.8
0.8
1.6
1.2
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
9.1
9
10
8
8
9
February
10.9
11
13
10
9
10
March
11.3
12
13
11
13
10
April
11.3
12
12
11
10
May
10.4
9
11
11
10
June
9.4
9
8
9
12
July
7.9
9
7
7
8
August
7.4
8
7
7
7
September
7.9
7
8
8
8
October
8.6
9
8
10
9
November
8.6
8
10
7
10
December
8.0
8
9
11
9
Average
9.4
10.8
9.5
8.9
9.2
9.2
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
199°
232°
267°
232°
228°
February
254°
228°
189°
182°
205°
March
236°
223°
244°
213°
201°
April
201°
221°
192°
207°
May
158°
219°
161°
177°
June
224°
134°
150°
168°
July
154°
136°
155°
147°
August
134°
093°
169°
156°
September
172°
159°
181°
072°
October
163°
278°
213°
135°
November
172°
203°
119°
200°
December
274°
231°
232°
002°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.