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
88.5
90
89
95
92
83
February
85.0
96
92
90
79
87
March
91.9
89
91
97
91
93
April
93.7
94
94
92
96
May
82.7
37
90
92
94
June
76.7
0
96
89
94
July
74.0
0
95
89
90
August
78.1
0
86
93
96
September
91.1
87
91
94
97
October
92.8
96
97
93
92
November
90.0
93
88
96
86
December
85.7
98
94
84
89
Average
86.7
91.5
61.2
92.7
90.1
91.3
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
16.4
15
20
17
17
18
February
20.3
21
22
20
16
18
March
23.4
23
25
24
23
26
April
25.5
26
27
26
26
May
26.4
12
32
29
29
June
26.8
0
35
32
32
July
26.7
0
34
32
33
August
27.8
0
33
34
32
September
31.2
33
32
29
28
October
27.0
28
27
28
27
November
21.0
21
22
21
24
December
18.2
18
16
23
18
Average
23.8
19.7
16.9
26.9
25.4
26.0
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
3.8
2
8
2
4
7
February
8.2
7
10
5
4
7
March
10.2
10
12
8
11
14
April
12.2
13
12
12
14
May
15.0
6
18
17
16
June
16.7
0
22
20
20
July
17.3
0
23
22
21
August
18.4
0
22
22
21
September
18.6
16
18
17
21
October
13.6
13
12
16
14
November
7.4
8
8
6
10
December
6.4
4
7
11
3
Average
11.7
6.0
7.3
13.3
12.9
14.1
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
0
7
2
1
15
February
9.1
0
6
3
6
14
March
15.2
0
7
1
10
2
April
16.0
6
5
11
24
May
8.0
2
2
4
23
June
17.1
0
1
5
47
July
10.7
0
14
6
14
August
5.5
0
7
2
11
September
7.2
0
8
1
3
October
8.5
0
9
8
2
November
5.7
0
4
0
8
December
8.4
0
13
5
1
Average
9.8
2.2
4.8
5.0
14.4
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
5.5
6
5
6
6
5
February
6.0
6
6
6
5
5
March
6.0
5
6
6
6
7
April
5.8
6
6
5
5
May
4.6
3
5
6
5
June
4.3
4
4
5
5
July
3.4
3
3
3
4
August
3.6
5
3
4
3
September
3.6
4
3
4
5
October
4.5
5
4
4
5
November
4.1
4
4
4
4
December
4.7
4
4
5
5
Average
4.8
5.7
4.5
4.6
4.7
4.8
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
268°
209°
305°
262°
139°
February
220°
203°
179°
343°
293°
March
158°
192°
203°
159°
190°
April
154°
174°
165°
248°
May
147°
183°
142°
167°
June
225°
278°
160°
175°
July
246°
207°
202°
195°
August
276°
166°
136°
144°
September
073°
031°
034°
059°
October
072°
150°
149°
072°
November
030°
035°
029°
043°
December
200°
144°
200°
212°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.