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
January
79.4
79
80
February
97.8
98
98
March
92.2
92
92
April
94.2
94
May
93.5
94
June
98.0
98
July
95.8
96
August
93.4
93
September
97.0
97
October
90.6
91
November
93.6
95
93
December
75.4
86
69
Average
88.2
90.2
92.9
81.4
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
January
6.6
3
10
February
13.9
15
13
March
15.7
17
14
April
20.9
21
May
24.7
25
June
29.1
29
July
30.1
30
August
28.1
28
September
27.4
28
October
20.7
21
November
13.4
15
11
December
9.9
11
9
Average
13.8
11.6
20.0
9.8
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-1.2
-3
1
February
2.6
3
3
March
4.8
6
4
April
8.0
8
May
13.6
14
June
16.5
17
July
22.8
23
August
20.3
20
September
15.7
16
October
10.4
10
November
2.9
4
1
December
2.0
3
1
Average
4.3
1.9
9.7
1.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
3.5
0
7
February
1.8
0
4
March
0.0
0
0
April
0.0
0
May
0.0
0
June
0.0
0
July
0.0
0
August
0.0
0
September
0.0
0
October
0.0
0
November
3.7
0
6
December
5.5
0
9
Average
2.7
0.7
7.3
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
January
5.9
6
6
February
6.6
7
7
March
6.6
6
7
April
6.6
7
May
4.5
5
June
4.3
4
July
4.0
4
August
4.1
4
September
2.7
3
October
4.6
5
November
4.3
5
4
December
4.7
5
4
Average
5.1
6.2
5.0
4.2
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
278°
260°
February
280°
232°
March
224°
255°
April
251°
May
057°
June
351°
July
230°
August
311°
September
050°
October
267°
November
244°
272°
December
225°
221°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.