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
93.0
85
100
97
94
90
February
90.5
97
89
96
84
96
March
95.4
98
96
98
99
91
April
96.4
95
98
98
96
99
May
97.0
96
96
95
98
June
98.9
99
98
99
100
July
99.1
100
100
97
98
August
99.0
100
100
99
100
September
95.1
96
100
99
92
October
95.7
90
99
98
95
November
93.8
94
87
98
94
December
93.3
98
85
97
97
Average
95.7
93.8
97.1
96.2
96.4
95.9
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
13.3
10
16
15
13
15
February
15.1
20
16
13
8
15
March
21.2
22
20
22
21
22
April
24.6
25
24
27
22
24
May
29.1
29
32
26
30
June
33.8
35
36
32
34
July
36.4
39
40
34
36
August
36.3
40
39
35
36
September
31.4
34
32
34
28
October
25.4
23
27
28
27
November
18.9
20
17
21
20
December
15.5
16
15
22
15
Average
24.4
19.2
27.3
25.3
24.7
25.0
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
0.9
-1
6
-1
2
3
February
2.2
6
5
-1
-2
2
March
7.9
9
8
5
8
11
April
11.2
13
11
12
11
11
May
17.1
17
18
16
17
June
21.2
21
23
21
21
July
22.1
24
26
21
24
August
23.6
26
26
22
23
September
19.9
22
22
19
18
October
12.6
13
13
14
12
November
6.0
7
5
7
8
December
3.7
4
6
7
2
Average
11.7
6.5
14.5
11.5
12.2
12.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.6
15
0
0
4
6
February
4.0
4
0
4
7
6
March
2.6
6
2
2
3
3
April
2.2
3
2
1
4
1
May
2.3
2
2
6
4
June
2.1
2
2
4
1
July
1.2
2
1
1
2
August
1.2
0
0
1
1
September
5.5
3
0
1
6
October
4.2
9
5
1
0
November
3.3
7
5
1
3
December
2.9
3
1
1
5
Average
3.2
6.6
2.5
2.0
2.7
3.0
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
8.2
8
6
8
8
9
February
8.9
9
7
9
9
9
March
10.0
10
10
11
11
9
April
10.8
11
11
13
11
10
May
10.0
8
13
9
10
June
9.3
9
10
8
10
July
7.9
9
8
8
9
August
8.2
9
9
9
8
September
8.2
8
10
9
7
October
9.2
9
9
10
10
November
8.6
8
9
9
9
December
8.0
8
8
8
8
Average
9.1
9.5
8.7
9.8
9.1
8.9
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
312°
222°
329°
322°
178°
February
250°
200°
321°
017°
328°
March
174°
223°
225°
167°
112°
April
164°
114°
167°
111°
134°
May
130°
160°
126°
130°
June
124°
159°
160°
161°
July
176°
170°
148°
146°
August
135°
171°
160°
140°
September
135°
131°
150°
072°
October
158°
150°
146°
141°
November
173°
171°
170°
181°
December
231°
187°
198°
319°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.