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
87.6
90
74
91
86
88
February
81.5
98
80
87
74
81
March
88.0
91
90
95
71
78
April
95.4
95
90
95
100
98
May
93.6
95
94
92
88
June
73.3
87
84
55
7
July
68.8
92
16
0
95
August
89.1
90
76
87
93
September
96.1
96
95
98
95
October
94.3
97
98
93
93
November
90.6
94
80
99
94
December
84.0
82
62
78
91
Average
87.7
93.5
89.2
81.1
76.5
84.5
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
9.0
9
13
9
10
12
February
14.4
16
16
14
12
12
March
17.4
18
17
19
19
18
April
21.1
22
21
21
21
21
May
25.4
24
26
24
23
June
28.4
27
30
28
28
July
30.0
31
29
29
31
August
25.8
30
2
29
30
September
27.8
27
26
26
27
October
22.5
23
21
22
23
November
16.3
17
17
15
19
December
12.7
13
12
16
12
Average
20.2
16.2
21.5
19.1
21.1
21.3
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
0.5
-1
2
-1
2
3
February
3.8
3
3
3
2
3
March
6.3
7
3
6
10
10
April
8.3
10
6
9
8
8
May
14.3
13
15
13
13
June
17.8
16
19
18
17
July
17.1
18
19
19
20
August
14.3
20
1
20
20
September
14.5
15
15
16
17
October
9.7
10
7
12
13
November
4.2
5
7
3
7
December
3.1
2
6
7
1
Average
8.4
4.6
9.3
8.7
10.7
11.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
11.0
11
18
6
11
15
February
14.3
3
16
9
12
26
March
10.4
11
10
5
14
19
April
7.3
7
10
5
5
8
May
5.5
5
5
7
6
June
5.5
6
3
6
1
July
2.8
2
1
0
5
August
4.8
4
6
0
8
September
4.1
3
6
1
9
October
5.1
3
1
1
5
November
5.9
6
9
0
5
December
13.2
13
26
9
9
Average
7.2
8.0
7.5
5.6
5.0
9.0
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
5.0
6
5
4
5
5
February
4.9
6
5
5
5
5
March
5.5
6
6
6
5
5
April
5.4
6
5
5
5
6
May
4.0
5
4
4
4
June
3.1
4
3
3
3
July
2.4
3
2
2
2
August
2.6
3
2
3
2
September
3.2
3
3
3
4
October
3.9
4
4
4
3
November
4.3
5
5
4
5
December
4.4
5
4
4
5
Average
4.1
5.7
4.3
3.9
3.7
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
320°
245°
294°
286°
168°
February
228°
211°
215°
255°
264°
March
262°
249°
236°
165°
221°
April
215°
198°
219°
283°
299°
May
099°
215°
208°
222°
June
233°
050°
186°
189°
July
299°
227°
245°
298°
August
275°
210°
164°
228°
September
071°
022°
360°
094°
October
229°
349°
232°
142°
November
093°
131°
303°
135°
December
207°
200°
205°
288°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.