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
79.3
75
84
79
February
91.2
98
97
79
March
87.8
89
89
86
April
92.8
98
88
May
93.8
96
92
June
95.0
93
97
July
93.4
95
92
August
93.6
94
93
September
94.3
95
94
October
98.4
98
99
November
89.8
90
December
80.4
81
80
Average
90.3
87.4
93.6
89.9
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
4.6
3
8
3
February
11.0
12
13
8
March
14.1
15
13
15
April
17.7
19
16
May
23.6
23
25
June
27.3
26
28
July
29.4
29
30
August
28.4
29
28
September
25.7
27
25
October
19.8
21
19
November
12.6
13
December
7.0
6
7
Average
16.2
9.9
20.5
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
January
-3.4
-3
1
-6
February
-1.9
1
1
-2
March
2.7
4
2
3
April
6.3
6
7
May
11.7
10
13
June
14.9
14
16
July
19.0
19
20
August
17.1
17
18
September
13.1
13
13
October
6.8
9
6
November
2.7
3
December
0.5
2
0
Average
5.7
0.5
9.1
7.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
14.9
20
11
14
February
6.9
3
4
14
March
7.3
9
9
4
April
7.1
3
12
May
7.3
5
10
June
3.6
5
2
July
6.2
4
8
August
4.4
4
5
September
1.3
1
2
October
1.7
3
1
November
5.9
6
December
10.8
8
12
Average
7.4
10.4
4.9
7.0
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
5.8
6
6
6
February
6.7
6
7
6
March
7.3
7
7
8
April
6.8
6
7
May
4.9
5
5
June
4.0
4
4
July
3.7
4
4
August
3.7
4
3
September
3.6
3
4
October
5.1
4
6
November
5.8
6
December
4.8
5
5
Average
5.6
6.5
5.0
5.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
248°
238°
261°
February
255°
242°
235°
March
246°
246°
246°
April
247°
229°
May
029°
198°
June
279°
255°
July
250°
255°
August
263°
252°
September
084°
291°
October
282°
242°
November
232°
December
254°
221°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.