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
78.5
65
77
93
February
91.1
97
93
84
March
90.7
91
85
95
April
94.4
94
95
May
95.7
100
93
June
96.7
91
100
July
94.0
94
94
August
94.3
97
92
September
94.7
94
96
October
95.8
93
99
November
92.1
91
94
December
80.1
82
78
Average
90.2
85.2
91.5
93.9
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
3.2
2
6
2
February
9.1
11
11
6
March
13.3
15
11
14
April
17.5
19
16
May
24.8
24
25
June
20.9
28
14
July
24.4
31
18
August
29.1
29
29
September
26.3
27
26
October
18.4
18
19
November
12.8
13
13
December
7.5
9
6
Average
14.6
9.1
18.8
16.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-4.2
-4
0
-7
February
-2.1
-1
0
-4
March
2.5
4
1
3
April
6.4
6
7
May
11.9
11
13
June
10.8
16
6
July
15.6
19
13
August
18.4
18
19
September
14.0
14
14
October
7.4
8
7
November
2.3
2
3
December
0.6
1
0
Average
4.6
-1.5
8.1
6.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
3.7
11
0
0
February
1.4
4
0
0
March
1.9
6
0
0
April
0.0
0
0
May
0.0
0
0
June
0.0
0
0
July
0.0
0
0
August
0.0
0
0
September
0.0
0
0
October
1.4
3
0
November
2.0
4
0
December
4.4
7
0
Average
2.6
6.9
0.9
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
6.3
8
4
7
February
7.1
8
6
8
March
8.6
9
8
8
April
7.8
7
9
May
6.8
6
8
June
5.5
6
5
July
5.3
5
6
August
5.1
5
5
September
4.1
4
4
October
6.5
7
6
November
6.3
7
6
December
5.8
7
5
Average
6.8
8.2
5.8
6.3
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
240°
263°
273°
February
254°
232°
244°
March
226°
255°
238°
April
236°
214°
May
076°
179°
June
024°
261°
July
262°
274°
August
281°
266°
September
120°
307°
October
264°
232°
November
238°
223°
December
220°
205°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.