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
2020
January
79.9
86
17
98
86
97
February
94.1
95
97
97
86
93
March
94.0
96
98
98
98
88
April
95.7
97
95
99
94
95
May
95.4
93
98
91
96
June
95.7
95
89
96
100
July
98.9
98
100
95
100
August
98.4
100
95
98
100
September
95.7
98
100
99
96
October
91.7
93
94
98
89
November
92.2
88
94
97
92
December
93.2
88
93
99
97
Average
94.0
94.4
88.4
96.1
94.6
95.2
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
2021
2020
January
10.3
9
2
12
10
13
February
14.1
16
15
12
9
12
March
19.1
19
18
19
19
19
April
23.3
24
23
26
21
23
May
27.9
26
31
26
30
June
31.9
31
33
31
33
July
33.1
33
36
30
35
August
32.2
35
31
30
34
September
28.9
31
29
30
28
October
21.9
23
22
24
23
November
16.7
17
14
19
19
December
13.4
14
13
18
13
Average
22.1
17.0
22.4
23.5
22.2
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
2020
January
-4.3
-5
-2
-6
-3
-2
February
-3.4
0
-2
-6
-6
-3
March
2.6
3
2
0
2
5
April
6.1
7
5
7
6
6
May
12.3
13
13
12
12
June
16.9
16
18
17
17
July
19.1
19
21
18
20
August
18.4
19
19
18
19
September
14.5
15
15
14
12
October
7.3
8
8
9
6
November
1.3
1
1
2
3
December
-2.2
-1
0
0
-3
Average
6.8
1.0
7.9
7.6
7.5
7.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
1.8
6
2
2
2
1
February
3.1
5
1
5
12
1
March
1.3
2
0
2
1
3
April
1.1
2
0
0
1
0
May
1.6
5
0
2
1
June
1.0
1
1
2
1
July
1.0
1
0
1
1
August
1.4
1
5
1
1
September
1.4
1
0
0
1
October
2.8
0
7
1
1
November
1.2
1
3
0
1
December
2.2
5
4
1
0
Average
1.7
3.1
1.4
2.2
2.0
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
2021
2020
January
8.7
9
1
10
10
10
February
11.6
12
14
11
10
10
March
11.5
11
12
12
13
11
April
12.4
13
11
14
12
11
May
10.9
9
13
11
10
June
9.9
8
11
9
12
July
7.6
8
8
6
8
August
7.7
8
7
7
9
September
8.1
8
9
8
8
October
9.2
9
8
10
11
November
10.0
9
11
9
11
December
10.2
11
9
11
11
Average
10.0
11.6
8.6
10.2
9.5
10.0
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
263°
336°
309°
311°
286°
February
274°
257°
307°
326°
305°
March
253°
239°
285°
231°
241°
April
257°
228°
230°
256°
262°
May
163°
225°
157°
194°
June
165°
177°
178°
191°
July
191°
189°
170°
187°
August
183°
157°
191°
182°
September
197°
205°
195°
291°
October
203°
215°
263°
221°
November
260°
242°
263°
235°
December
269°
244°
251°
320°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.