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
79.4
81
33
90
95
86
February
78.6
93
86
86
42
91
March
95.2
95
98
91
97
94
April
93.6
95
94
96
92
May
96.1
97
96
96
97
June
95.2
98
96
92
96
July
96.3
97
96
95
96
August
94.6
91
93
95
97
September
88.6
98
65
90
95
October
93.4
96
96
91
88
November
90.0
95
88
91
92
December
79.1
97
35
80
91
Average
90.7
89.9
90.2
87.8
89.3
93.2
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
10.4
8
5
11
11
13
February
14.0
17
17
13
7
13
March
19.3
20
19
19
21
20
April
22.5
23
23
22
22
May
28.4
28
29
27
27
June
31.6
32
33
31
31
July
32.9
33
34
32
33
August
31.9
32
32
32
32
September
29.2
31
22
29
29
October
24.9
26
25
26
23
November
17.3
21
17
17
20
December
13.5
14
8
19
13
Average
22.2
14.8
23.4
22.5
22.9
22.9
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
2.3
-1
1
0
3
5
February
4.7
7
7
2
2
4
March
9.0
10
9
7
10
12
April
11.8
12
12
12
12
May
17.9
17
19
16
17
June
20.9
20
21
21
21
July
23.0
23
23
23
24
August
21.6
20
22
23
21
September
17.5
18
11
18
19
October
12.8
14
11
14
12
November
6.1
8
7
5
8
December
4.6
4
4
9
2
Average
12.0
5.2
13.1
11.8
13.0
13.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
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
6.8
8
3
8
8
5
February
6.6
9
8
8
4
1
March
7.9
8
9
9
8
2
April
7.8
8
10
6
5
May
6.5
7
9
8
4
June
4.9
5
6
5
0
July
4.0
5
5
4
0
August
3.6
5
5
5
0
September
3.7
5
4
3
0
October
5.9
7
8
3
4
November
6.5
7
6
7
7
December
6.7
7
3
9
7
Average
6.1
8.4
6.4
6.8
5.8
2.7
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
324°
245°
333°
282°
183°
February
193°
196°
176°
130°
187°
March
153°
193°
222°
171°
177°
April
089°
166°
228°
275°
May
087°
175°
134°
144°
June
136°
030°
156°
360°
July
214°
185°
203°
360°
August
309°
161°
087°
360°
September
032°
360°
054°
360°
October
219°
205°
202°
077°
November
038°
011°
189°
063°
December
192°
156°
186°
212°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.