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
2025
2024
2023
2022
2021
January
83.3
92
80
93
80
February
88.5
96
99
95
86
93
March
91.9
100
93
91
97
95
April
95.3
96
93
96
May
93.5
92
93
99
92
94
June
95.6
93
100
93
99
96
July
95.7
97
96
95
95
August
95.0
99
94
92
100
September
95.1
100
97
96
October
93.2
99
94
96
November
93.5
94
92
94
94
December
89.7
96
88
77
89
Average
93.1
94.1
97.1
93.4
93.6
93.0
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
2025
2024
2023
2022
2021
January
2.8
-4.5
6.7
2.1
2.3
February
6.4
3.6
10.5
11.3
4.0
-1.9
March
11.4
13.3
13.0
10.6
13.8
14.1
April
17.0
19.3
16.8
17.0
May
22.1
20.8
25.0
24.3
25.3
20.6
June
27.6
27.6
28.6
29.3
29.6
27.3
July
28.1
28.8
29.3
29.8
27.1
August
27.5
28.8
28.1
28.3
24.3
September
26.5
27.8
26.6
25.1
October
19.2
21.3
20.1
19.3
November
11.6
11.5
13.9
12.9
10.9
December
6.8
3.6
9.4
6.4
11.3
Average
16.9
12.3
20.0
18.8
18.6
14.8
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
-4.2
-9.1
0.9
-7.5
-3.1
February
-2.8
-3.3
2.7
1.1
-4.1
-8.7
March
2.6
4.9
5.7
3.1
2.9
2.5
April
6.2
7.7
7.2
6.0
May
10.9
9.3
16.3
12.5
14.8
8.0
June
14.1
13.5
18.5
17.5
18.1
11.5
July
15.4
15.5
20.0
21.1
13.5
August
13.9
17.5
18.3
18.3
9.5
September
13.4
17.1
15.0
15.0
October
8.3
8.9
9.1
7.2
November
2.5
5.0
2.6
3.2
1.0
December
-1.4
-2.1
2.3
0.5
2.0
Average
6.6
3.2
10.6
9.0
8.8
4.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
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
0
June
0.0
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
October
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
2025
2024
2023
2022
2021
January
7.1
8
7
7
6
February
7.3
7
7
8
6
6
March
8.3
9
9
8
8
7
April
7.7
7
8
8
May
6.7
6
6
6
7
6
June
6.0
5
6
6
5
6
July
4.9
5
5
5
4
August
4.5
5
5
5
4
September
4.7
5
4
5
October
6.0
5
5
7
November
6.8
8
6
7
6
December
6.6
7
6
6
7
Average
6.4
7.1
6.1
5.8
6.4
6.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
265°
260°
278°
225°
February
264°
233°
237°
243°
357°
March
230°
229°
151°
237°
180°
April
232°
220°
256°
May
274°
237°
069°
181°
220°
June
238°
243°
064°
251°
217°
July
227°
244°
243°
238°
August
301°
228°
230°
033°
September
075°
123°
297°
October
245°
249°
237°
November
238°
241°
223°
238°
December
242°
221°
206°
217°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.