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
2021
January
90.1
92
93
86
February
94.3
91
96
96
March
91.8
91
95
89
92
April
97.2
94
100
98
May
94.8
95
97
91
June
97.6
99
97
98
July
98.3
95
99
99
August
99.5
0
100
99
September
96.6
95
100
October
95.8
95
99
November
95.2
84
97
100
December
98.0
94
100
100
Average
95.0
91.3
95.0
96.5
97.1
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
2021
January
7.7
6
10
10
February
10.3
10
12
9
March
13.0
13
13
14
13
April
19.3
19
20
19
May
23.1
23
24
22
June
29.4
28
30
30
July
32.4
33
33
32
August
30.9
0
31
32
September
29.9
30
30
October
20.0
21
19
November
11.5
9
13
11
December
11.3
10
11
14
Average
18.0
9.4
18.5
20.8
23.4
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
-6.7
-7
-2
-5
February
-5.9
-1
-4
-7
March
-2.9
0
-3
-1
0
April
2.3
2
3
2
May
7.6
9
7
7
June
13.3
12
14
15
July
16.4
16
17
16
August
15.9
0
16
17
September
13.0
13
14
October
5.7
5
7
November
-4.7
-5
-3
-1
December
-1.0
-3
-2
2
Average
3.5
-3.0
3.4
5.0
8.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
3.6
9
0
0
February
2.3
8
0
0
March
2.5
10
0
0
0
April
0.0
0
0
0
May
0.0
0
0
0
June
0.0
0
0
0
July
0.0
0
0
0
August
0.0
0
0
0
September
0.0
0
0
October
0.0
0
0
November
1.8
16
0
0
December
2.0
7
0
0
Average
2.5
9.1
1.1
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
2021
January
9.8
10
12
8
February
11.7
13
13
9
March
11.6
12
13
10
11
April
11.7
11
13
11
May
9.4
8
11
8
June
8.7
9
9
8
July
6.4
4
8
6
August
7.0
0
7
8
September
7.8
8
8
October
9.0
9
11
November
8.9
8
9
3
December
13.1
9
14
16
Average
9.9
11.5
9.8
9.2
9.1
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
287°
263°
270°
February
262°
254°
262°
March
257°
251°
276°
261°
April
253°
252°
273°
May
238°
251°
251°
June
235°
245°
251°
July
009°
265°
017°
August
360°
273°
251°
September
254°
229°
October
262°
253°
November
285°
256°
040°
December
279°
259°
254°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.