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
97.1
100
95
100
97
100
February
96.8
95
89
100
100
99
March
97.8
88
98
99
99
100
April
97.8
99
100
99
99
May
99.7
100
100
100
100
June
99.7
100
100
100
100
July
99.7
100
100
99
100
August
98.0
99
100
95
98
September
90.9
69
99
93
76
October
98.4
100
100
100
91
November
99.0
99
100
100
100
December
98.1
100
100
96
96
Average
97.4
94.1
95.8
99.7
98.1
96.5
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
14
8
14
13
15
February
14.4
14
12
17
17
18
March
17.7
18
13
21
18
17
April
24.2
24
25
26
23
May
27.9
27
29
30
31
June
34.1
30
35
37
34
July
37.9
39
38
38
39
August
36.4
34
37
37
38
September
31.1
23
33
34
34
October
25.2
25
26
24
29
November
18.5
18
15
22
19
December
12.5
14
10
11
14
Average
23.3
15.1
22.3
25.4
25.5
25.9
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
-4.8
-3
-3
-4
-4
-5
February
-3.5
-1
-4
-3
-2
-2
March
0.0
1
-1
1
-2
0
April
4.3
3
4
4
5
May
8.0
7
7
8
10
June
12.4
11
13
14
12
July
15.6
16
16
18
14
August
14.1
14
16
14
15
September
9.8
8
12
10
11
October
3.5
4
4
3
5
November
-2.7
-2
-4
2
-1
December
-4.2
-3
-4
-3
-5
Average
4.1
-1.0
4.0
5.1
5.1
4.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
4.7
1
15
0
3
0
February
5.8
9
11
0
0
2
March
4.2
2
13
2
0
3
April
1.1
0
0
0
3
May
1.4
0
0
1
1
June
1.1
1
0
1
0
July
0.6
0
1
2
0
August
0.7
4
1
0
0
September
0.5
0
2
0
0
October
0.7
0
0
3
0
November
2.7
5
3
1
1
December
2.9
3
4
8
2
Average
2.3
4.1
4.0
0.9
1.3
0.9
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
6.2
7
8
5
6
6
February
7.7
7
8
9
9
8
March
8.2
7
9
10
9
9
April
7.9
7
8
8
7
May
7.6
7
8
8
8
June
6.4
6
6
7
7
July
6.4
5
7
7
7
August
6.2
8
6
6
6
September
6.4
6
7
7
7
October
6.0
6
5
7
6
November
5.4
6
7
4
6
December
5.3
4
5
5
6
Average
6.8
7.2
6.7
7.0
6.9
6.8
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
360°
345°
335°
260°
340°
February
161°
299°
339°
339°
333°
March
311°
162°
357°
339°
155°
April
331°
300°
318°
282°
May
170°
335°
332°
216°
June
258°
238°
178°
257°
July
191°
163°
172°
165°
August
162°
167°
188°
185°
September
166°
165°
180°
169°
October
313°
294°
337°
315°
November
324°
340°
312°
320°
December
311°
322°
310°
333°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.