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
89.4
91
87
95
84
88
February
81.4
86
89
93
67
84
March
88.6
88
91
88
88
83
April
92.6
88
95
93
97
May
93.3
92
91
95
96
June
92.7
96
95
89
93
July
92.6
95
89
91
91
August
93.0
98
94
91
91
September
93.3
95
94
90
87
October
92.5
96
94
94
89
November
87.4
85
84
96
88
December
79.2
87
74
68
86
Average
89.9
88.0
91.8
91.0
87.7
89.8
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
15.9
15
18
15
15
17
February
19.9
19
22
21
16
18
March
22.2
22
22
23
23
25
April
24.5
25
25
23
25
May
28.4
28
29
27
28
June
30.7
31
33
30
30
July
31.4
32
30
30
32
August
31.6
34
31
31
32
September
29.4
30
29
29
29
October
26.0
25
25
26
26
November
20.0
19
21
19
23
December
17.1
16
19
21
16
Average
24.1
18.6
25.1
25.2
24.0
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
4.8
4
7
3
6
7
February
8.9
7
11
10
6
7
March
9.8
11
11
10
11
14
April
11.7
13
12
12
13
May
15.9
17
18
16
16
June
20.2
20
22
21
21
July
21.0
22
20
22
22
August
21.8
23
21
22
22
September
18.9
20
19
20
21
October
15.2
14
11
16
18
November
8.7
9
10
7
12
December
7.3
6
10
11
4
Average
12.9
7.0
14.3
14.1
13.8
14.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.3
0
7
7
10
10
February
4.4
0
4
2
7
9
March
3.1
0
2
4
6
3
April
2.8
0
1
4
3
May
2.7
0
3
1
4
June
5.0
0
2
6
5
July
3.8
0
5
9
4
August
4.4
0
6
5
6
September
3.0
0
2
3
8
October
3.2
0
1
3
3
November
3.2
0
2
2
2
December
6.5
0
3
5
5
Average
3.5
0.9
3.1
4.9
5.0
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
5
4
5
4
5
February
5.5
5
6
6
6
6
March
5.5
5
5
5
6
6
April
4.9
5
6
4
5
May
4.1
4
4
5
5
June
3.4
3
3
4
4
July
2.6
2
2
2
3
August
3.0
3
2
3
3
September
3.6
3
4
3
5
October
4.3
4
4
4
4
November
4.3
4
5
4
5
December
4.5
5
4
4
4
Average
4.3
5.1
4.0
4.0
4.1
4.5
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°
246°
310°
311°
087°
February
229°
214°
136°
021°
245°
March
054°
206°
181°
178°
208°
April
124°
159°
271°
291°
May
043°
172°
139°
132°
June
270°
020°
155°
145°
July
288°
205°
172°
180°
August
346°
176°
110°
187°
September
069°
044°
099°
075°
October
043°
040°
090°
095°
November
037°
041°
019°
049°
December
050°
102°
197°
354°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.