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
84.7
81
89
96
66
100
February
83.4
94
86
90
78
100
March
90.8
95
85
97
98
79
April
90.9
97
95
91
87
May
93.6
96
96
83
90
June
94.0
96
97
92
98
July
85.5
96
99
97
94
August
90.6
97
94
96
97
September
86.9
98
99
95
87
October
91.9
94
94
97
79
November
89.4
92
75
92
93
December
85.1
89
72
92
86
Average
88.5
90.1
93.2
93.1
90.0
89.2
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
12.7
11
16
15
11
10
February
15.3
20
17
16
10
22
March
20.8
22
21
22
22
21
April
23.4
23
26
22
23
May
27.8
29
30
26
28
June
33.2
34
35
33
34
July
35.9
36
39
35
36
August
35.5
40
36
35
36
September
32.1
35
34
34
29
October
26.1
26
27
28
24
November
19.8
20
17
20
22
December
15.8
16
15
22
16
Average
23.9
17.6
26.1
26.2
24.8
26.6
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
1.1
-1
4
0
2
7
February
3.3
7
4
1
-1
9
March
7.8
10
9
6
9
11
April
10.8
11
13
11
11
May
16.7
17
18
16
16
June
20.4
20
21
21
21
July
21.1
20
24
22
24
August
21.9
22
24
23
22
September
18.2
20
19
17
18
October
12.6
13
12
14
10
November
6.8
7
6
7
8
December
4.6
4
7
8
3
Average
11.3
5.2
12.5
12.4
12.4
14.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.4
6
5
2
4
0
February
6.9
4
8
4
7
0
March
4.1
5
6
2
4
8
April
4.9
4
2
8
3
May
5.1
2
3
14
7
June
2.9
3
1
3
3
July
2.3
2
2
4
3
August
3.5
0
6
7
2
September
2.9
2
1
1
4
October
3.6
5
8
3
2
November
3.4
5
5
2
3
December
6.3
6
7
2
9
Average
4.4
4.8
3.8
3.3
4.9
4.3
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
7.9
7
8
8
6
7
February
8.7
9
8
9
9
7
March
9.2
9
9
10
9
9
April
9.6
9
12
9
8
May
8.0
6
10
7
9
June
7.1
6
7
7
8
July
6.0
6
7
6
7
August
6.4
7
7
7
7
September
6.2
7
5
6
6
October
7.5
8
6
8
7
November
7.6
7
7
8
8
December
7.6
7
7
9
8
Average
7.8
8.5
7.2
7.9
7.5
7.6
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
316°
245°
301°
291°
190°
February
229°
245°
279°
345°
210°
March
184°
191°
213°
181°
175°
April
142°
175°
164°
179°
May
138°
172°
136°
145°
June
137°
153°
173°
180°
July
178°
180°
177°
166°
August
144°
144°
171°
138°
September
139°
167°
167°
071°
October
204°
220°
220°
129°
November
176°
156°
195°
178°
December
227°
243°
205°
258°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.