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
82.8
74
92
100
February
95.5
94
99
94
March
94.7
93
95
96
April
96.7
96
98
96
May
90.2
91
89
June
98.9
100
98
July
97.8
98
98
August
99.8
100
100
September
100.0
100
October
95.5
95
98
November
90.3
92
89
December
84.3
85
84
Average
93.2
89.5
95.2
94.8
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
7.2
5
10
14
February
12.5
16
12
10
March
16.3
18
15
16
April
21.1
23
23
17
May
24.7
27
23
June
31.8
31
32
July
35.5
35
36
August
35.1
35
36
September
33.0
33
October
22.7
23
23
November
14.3
15
13
December
9.8
11
9
Average
19.7
15.4
21.7
22.0
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-5.9
-6
-3
1
February
-3.7
2
-3
-6
March
1.5
4
2
-1
April
5.2
9
7
0
May
11.7
13
10
June
17.5
18
17
July
21.8
21
22
August
20.7
21
21
September
17.6
18
October
8.4
10
5
November
1.3
2
1
December
0.1
1
-1
Average
6.0
2.2
8.3
7.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
5.0
5
6
0
February
5.1
4
2
10
March
3.0
2
1
6
April
2.1
1
5
0
May
6.6
4
9
June
3.2
4
3
July
4.1
6
3
August
0.6
1
1
September
0.0
0
October
5.2
6
4
November
6.3
7
6
December
1.4
2
0
Average
3.5
2.8
3.6
4.2
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
9.5
9
10
9
February
11.1
11
11
11
March
13.1
13
13
13
April
14.1
14
13
16
May
9.9
7
13
June
6.9
6
8
July
8.2
8
8
August
7.0
7
7
September
10.1
10
October
11.4
12
11
November
10.4
9
12
December
10.2
10
10
Average
10.8
11.9
9.7
10.9
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
311°
287°
197°
February
199°
225°
330°
March
207°
036°
275°
April
164°
205°
179°
May
154°
143°
June
134°
161°
July
192°
146°
August
157°
162°
September
162°
October
059°
180°
November
167°
276°
December
267°
223°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.