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
77.0
75
79
February
95.5
96
96
March
85.6
82
89
April
95.8
96
May
96.6
97
June
85.3
85
July
85.9
86
August
51.8
94
10
September
79.5
91
67
October
86.8
85
89
November
88.5
89
88
December
82.3
87
75
Average
78.2
83.6
89.5
61.5
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
5.1
3
7
February
10.4
10
11
March
11.9
14
10
April
18.1
18
May
20.8
21
June
24.3
24
July
28.0
28
August
15.0
26
4
September
20.1
24
17
October
17.1
18
17
November
11.9
12
12
December
7.4
9
5
Average
12.4
8.8
17.2
11.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-2.5
-3
0
February
-2.9
-1
-1
March
1.2
2
0
April
7.6
8
May
10.0
10
June
13.8
14
July
19.0
19
August
8.8
17
1
September
11.7
14
10
October
7.7
9
7
November
2.2
1
3
December
1.0
2
-1
Average
3.7
-1.2
7.7
4.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
0.0
0
0
February
0.0
0
0
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
0
September
0.0
0
0
October
0.0
0
0
November
0.0
0
0
December
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
January
7.4
8
7
February
8.7
8
9
March
8.7
8
9
April
8.1
8
May
5.8
6
June
6.3
6
July
5.4
5
August
2.9
5
1
September
4.5
4
5
October
6.3
6
7
November
7.6
8
8
December
6.5
7
6
Average
6.5
8.1
6.7
4.8
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
253°
244°
February
257°
247°
March
267°
266°
April
254°
May
316°
June
293°
July
249°
August
277°
248°
September
344°
261°
October
260°
234°
November
247°
244°
December
235°
254°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.