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
93.9
97
98
99
100
65
February
98.2
100
98
100
99
100
March
99.2
99
98
100
100
100
April
99.8
100
99
99
May
99.7
100
100
100
98
June
99.6
99
99
100
100
July
99.5
100
99
100
100
August
99.4
99
100
98
100
September
99.3
100
98
99
100
October
99.3
100
99
100
100
November
99.4
99
100
100
100
December
97.0
98
98
100
96
Average
98.5
98.7
99.0
99.3
99.5
95.8
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
5.5
8
6
7
5
0
February
9.7
11
6
10
11
10
March
15.4
15
11
16
15
17
April
21.8
20
22
22
May
26.5
27
28
28
34
June
33.7
30
34
35
33
July
36.9
38
36
37
37
August
35.0
35
34
34
38
September
30.3
30
31
30
31
October
20.6
22
21
19
25
November
13.0
13
10
15
14
December
5.9
8
6
8
5
Average
19.5
11.3
20.6
21.7
21.5
21.7
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
-7.2
-5
-3
-10
-10
-8
February
-5.4
-2
-7
-8
-5
-5
March
0.0
1
0
-2
-1
1
April
4.0
2
3
3
May
8.6
10
9
9
16
June
14.3
12
15
17
13
July
18.8
17
20
20
16
August
17.1
17
19
17
17
September
11.7
12
12
12
9
October
2.9
3
4
4
2
November
-3.0
-3
-5
-2
-4
December
-8.2
-8
-6
-5
-12
Average
3.4
-2.0
4.4
4.7
4.8
3.3
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
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
2.4
3
4
2
2
2
February
4.7
5
4
3
5
4
March
5.1
7
6
4
2
3
April
5.6
7
7
0
May
6.0
6
7
6
6
June
6.7
7
6
6
8
July
4.4
4
5
4
5
August
3.9
4
3
3
4
September
4.6
5
3
3
4
October
3.8
4
3
4
4
November
3.0
3
3
2
4
December
2.2
2
3
4
2
Average
4.4
5.1
4.6
4.2
3.4
4.0
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
323°
176°
355°
255°
333°
February
244°
215°
328°
311°
355°
March
232°
210°
257°
206°
223°
April
258°
250°
360°
May
189°
244°
208°
182°
June
214°
195°
202°
229°
July
201°
224°
208°
222°
August
205°
166°
186°
214°
September
202°
174°
176°
305°
October
239°
250°
234°
276°
November
261°
218°
285°
257°
December
293°
345°
240°
346°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.