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
69.0
68
70
February
91.1
92
91
March
87.5
85
91
April
93.5
94
May
95.2
95
June
84.3
84
July
91.9
92
91
August
90.4
91
90
September
88.8
91
87
October
91.8
88
96
November
88.2
90
87
December
79.6
82
76
Average
86.3
81.5
88.5
88.8
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
3.8
2
5
February
9.8
9
11
March
10.8
12
10
April
17.2
17
May
20.8
21
June
24.4
25
July
31.9
28
38
August
26.9
26
28
September
26.3
30
22
October
17.0
17
17
November
11.4
11
12
December
6.9
8
5
Average
15.1
7.8
17.4
20.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-2.8
-3
0
February
-1.8
0
0
March
1.8
3
1
April
6.5
7
May
10.1
10
June
14.3
14
July
10.5
18
0
August
14.1
15
13
September
10.5
7
14
October
7.9
9
7
November
2.9
2
4
December
1.4
3
0
Average
4.7
0.1
7.1
7.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
26.9
30
24
February
6.8
6
8
March
16.9
14
20
April
11.4
11
May
9.6
10
June
5.1
5
July
4.3
4
5
August
7.3
8
7
September
6.2
2
11
October
5.4
8
3
November
9.7
10
9
December
11.8
13
10
Average
11.2
16.4
9.7
7.4
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
6.9
8
6
February
7.8
7
9
March
7.7
7
9
April
7.3
7
May
5.7
6
June
5.9
6
July
5.3
5
6
August
4.8
5
4
September
4.8
4
5
October
6.4
6
7
November
7.4
7
8
December
6.3
6
6
Average
6.4
7.2
6.2
5.9
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
243°
238°
February
251°
239°
March
253°
260°
April
237°
May
348°
June
336°
July
252°
242°
August
278°
254°
September
023°
267°
October
256°
241°
November
241°
235°
December
226°
236°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.