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
January
88.3
84
89
91
88
February
89.3
98
94
89
76
March
88.4
82
93
87
87
April
90.8
88
94
94
May
63.8
34
82
94
June
72.7
43
94
92
July
92.1
92
92
93
August
92.7
94
91
94
September
91.7
89
94
95
October
89.6
94
82
90
November
95.2
96
91
99
December
81.3
78
77
93
Average
87.2
87.8
80.1
89.0
91.4
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
January
6.5
7
10
4
6
February
9.6
10
12
10
5
March
13.1
15
13
15
15
April
18.6
21
18
19
May
22.9
21
23
23
June
26.1
27
27
24
July
29.2
31
30
29
August
28.9
28
29
29
September
25.1
25
25
26
October
19.8
21
17
22
November
13.8
15
15
12
December
8.9
10
8
12
Average
16.8
10.4
19.5
18.6
18.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
-3.4
-2
0
-5
-2
February
-2.9
-2
0
-2
-2
March
1.1
2
1
1
2
April
4.8
4
5
6
May
9.0
2
12
9
June
11.5
12
14
3
July
16.3
19
19
15
August
15.4
13
17
20
September
10.7
14
4
14
October
7.8
7
5
11
November
1.0
0
3
0
December
0.7
0
-1
1
Average
4.9
-1.5
6.0
6.2
6.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
0.0
0
0
0
0
February
0.0
0
0
0
0
March
0.0
0
0
0
0
April
0.0
0
0
0
May
0.0
0
0
0
June
0.0
0
0
0
July
0.0
0
0
0
August
0.0
0
0
0
September
0.0
0
0
0
October
0.0
0
0
0
November
0.0
0
0
0
December
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
January
5.7
6
6
5
5
February
5.4
5
6
6
5
March
6.8
6
7
7
7
April
6.4
6
7
7
May
4.4
4
5
5
June
4.2
5
4
3
July
3.3
4
3
3
August
3.8
4
4
3
September
3.9
4
4
4
October
4.4
4
4
5
November
4.9
5
5
5
December
4.3
4
5
4
Average
5.0
5.7
4.7
5.0
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
January
285°
273°
292°
303°
February
275°
265°
268°
287°
March
297°
288°
244°
285°
April
237°
282°
283°
May
014°
067°
296°
June
284°
245°
195°
July
202°
207°
247°
August
254°
218°
153°
September
002°
318°
254°
October
284°
330°
286°
November
281°
270°
288°
December
282°
292°
258°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.