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
86.3
83
89
February
93.5
90
96
March
93.7
91
95
99
April
98.2
96
100
99
May
92.2
85
93
June
94.2
87
97
July
92.9
99
92
August
98.7
99
99
September
89.6
86
94
October
97.7
96
100
November
97.7
98
98
December
93.4
93
94
Average
93.6
90.6
94.0
96.2
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
7
7
February
12.9
15
11
March
16.7
17
15
20
April
23.0
24
23
23
May
27.0
23
28
June
29.9
26
33
July
35.5
34
36
August
33.6
33
35
September
31.1
31
32
October
22.9
23
23
November
14.4
16
13
December
10.1
11
10
Average
20.6
16.0
19.8
26.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-7.9
-5
-7
February
-4.6
-1
-6
March
-2.6
-1
-2
1
April
4.5
5
5
4
May
10.8
16
10
June
17.5
19
17
July
20.0
20
20
August
17.3
17
18
September
13.9
14
14
October
6.0
6
6
November
-2.3
-1
-3
December
-4.1
-3
-6
Average
4.5
-1.8
4.5
9.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
10.9
4
16
February
4.9
5
5
March
3.0
5
2
0
April
1.5
3
2
0
May
3.2
2
3
June
2.8
3
3
July
0.0
0
0
August
0.3
1
0
September
3.1
4
2
October
2.2
3
1
November
3.3
4
3
December
6.5
10
2
Average
3.5
4.3
4.7
1.5
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
9.7
9
10
February
11.9
12
12
March
12.5
12
13
13
April
14.0
13
13
15
May
12.7
11
13
June
11.5
10
12
July
9.3
7
10
August
8.7
9
9
September
9.0
9
10
October
10.5
11
10
November
11.5
11
13
December
12.1
11
13
Average
11.3
11.7
10.7
11.6
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
313°
338°
February
306°
320°
March
006°
348°
348°
April
320°
196°
302°
May
147°
132°
June
128°
168°
July
206°
145°
August
165°
151°
September
159°
153°
October
327°
236°
November
341°
297°
December
327°
284°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.