Auburn City Recreation Complex
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Auburn City Recreation Complex clear sky chart from 2005-11-06 to 2024-02-20.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
40%
24751
22%
80135
13%
24650
49%
24650
28%
48950

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 10thNight
31%
938
17%
4077
9%
926
41%
926
16%
2851
January11th to 20thNight
28%
949
23%
4010
9%
930
39%
930
17%
2546
January21st to endNight
26%
1035
14%
4507
7%
1023
36%
1023
15%
3073
February1st to 10thNight
25%
950
16%
2470
6%
950
31%
950
25%
1726
February11th to 20thNight
30%
914
19%
2385
7%
910
38%
910
29%
1562
February21st to endNight
27%
592
25%
1776
8%
592
42%
592
28%
1096
March1st to 10thNight
30%
548
24%
1988
13%
548
44%
548
25%
1145
March11th to 20thNight
31%
540
21%
1980
15%
540
41%
540
21%
1204
March21st to endNight
22%
594
12%
2178
6%
594
32%
594
15%
1528
April1st to 10thNight
26%
540
19%
1922
12%
540
40%
540
24%
1118
April11th to 20thNight
29%
533
23%
1707
14%
533
43%
533
26%
1052
April21st to endNight
30%
540
22%
1620
13%
540
44%
540
26%
1034
May1st to 10thNight
35%
540
15%
1620
10%
540
45%
540
24%
1075
May11th to 20thNight
39%
531
19%
1594
13%
531
47%
531
28%
999
May21st to endNight
41%
584
15%
1705
9%
582
46%
582
28%
1115
June1st to 10thNight
62%
540
23%
1440
13%
540
66%
540
43%
825
June11th to 20thNight
57%
540
22%
1440
11%
540
61%
540
43%
831
June21st to endNight
55%
540
24%
1448
11%
540
61%
540
50%
770
July1st to 10thNight
70%
525
16%
1575
12%
525
71%
525
41%
868
July11th to 20thNight
71%
522
22%
1566
18%
522
73%
522
46%
811
July21st to endNight
74%
591
25%
1673
23%
558
77%
558
43%
895
August1st to 10thNight
69%
537
21%
1601
22%
534
73%
534
41%
882
August11th to 20thNight
70%
534
29%
1600
32%
534
76%
534
43%
867
August21st to endNight
66%
594
29%
1847
30%
594
71%
594
44%
955
September1st to 10thNight
58%
540
25%
1854
23%
540
66%
540
37%
967
September11th to 20thNight
58%
540
29%
1980
29%
540
66%
540
36%
1008
September21st to endNight
52%
540
31%
1980
26%
540
63%
540
39%
963
October1st to 10thNight
44%
667
26%
2107
18%
667
51%
667
34%
1196
October11th to 20thNight
34%
720
27%
2160
12%
720
46%
720
36%
1212
October21st to endNight
36%
792
25%
2376
12%
792
46%
792
31%
1397
November1st to 10thNight
45%
861
30%
2341
14%
861
56%
861
41%
1298
November11th to 20thNight
33%
950
28%
2508
9%
950
46%
950
37%
1490
November21st to endNight
35%
950
23%
2660
11%
950
44%
950
32%
1601
December1st to 10thNight
33%
950
20%
2660
8%
950
43%
950
29%
1661
December11th to 20thNight
31%
949
25%
3103
9%
948
41%
948
25%
1857
December21st to endNight
27%
1041
14%
4677
8%
1026
40%
1026
13%
3472

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
12%7%36%5%3445%7%44%
78487
Night
11%7%36%43445%7%48%
80732
TransparencyDay
39%7%13%24%15%2
78210
Night
37%6%12%26%17%3
80529
SeeingDay
14%9%29%29%15%3
14695
Night
13%9%32%34%11%1
24779

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
11%13%411%9%44446%30%
2847
11th to 20thDay
10%11%5%8%5%38%45%6%35%
2850
21st to endDay
10%14%6%11%6%35%45%7%29%
3135
February1st to 10thDay
10%12%47%7%45%45%7%35%
1710
11th to 20thDay
10%7%5%7%6%35%5%5%8%40%
1682
21st to endDay
10%9%37%6%35%35%7%42%
1480
March1st to 10thDay
10%9%46%43445%5%44%
1971
11th to 20thDay
16%10%48%333346%40%
1980
21st to endDay
18%11%47%5%45%5%46%31%
2178
April1st to 10thDay
16%7%3442435%5%46%
2038
11th to 20thDay
16%7%35%5%345%6%7%41%
2199
21st to endDay
21%6%35%434446%39%
2340
May1st to 10thDay
16%8%36%5%35%45%7%37%
2340
11th to 20thDay
15%6%36%5%345%47%41%
2302
21st to endDay
18%6%25%5%45%5%6%8%35%
2567
June1st to 10thDay
7%4145%345%7%9%50%
2520
11th to 20thDay
8%4245%345%6%10%48%
2520
21st to endDay
7%326%6%36%6%6%8%46%
2505
July1st to 10thDay
9%3245%35%5%6%10%49%
2340
11th to 20thDay
6%4245%2446%9%54%
2340
21st to endDay
6%4245%35%5%7%10%49%
2546
August1st to 10thDay
7%425%6%45%5%7%11%44%
2328
11th to 20thDay
9%415%3345%6%8%51%
2301
21st to endDay
8%5%25%43445%7%54%
2507
September1st to 10thDay
13%42342435%6%53%
2103
11th to 20thDay
11%5%244335%47%52%
1980
21st to endDay
11%424423445%58%
1980
October1st to 10thDay
15%5%2443335%6%51%
1833
11th to 20thDay
12%6%3432334457%
1800
21st to endDay
13%7%25%433447%49%
1980
November1st to 10thDay
9%5%34324446%57%
1737
11th to 20thDay
10%6%26%33445%6%51%
1668
21st to endDay
13%8%35%33445%7%45%
1520
December1st to 10thDay
8%6%36%6%35%5%6%6%48%
1520
11th to 20thDay
10%9%38%7%3446%8%39%
1918
21st to endDay
17%11%6%13%7%34445%25%
2922
January1st to 10thNight
9%9%5%14%8%4445%6%33%
4108
11th to 20thNight
9%9%47%438%6%5%5%41%
4120
21st to endNight
13%13%5%9%5%34446%34%
4532
February1st to 10thNight
12%9%46%5%35%445%40%
2470
11th to 20thNight
10%8%37%5%345%5%7%44%
2384
21st to endNight
10%6%46%5%34446%48%
1776
March1st to 10thNight
9%7%46%424445%50%
1988
11th to 20thNight
15%10%35%323447%44%
1980
21st to endNight
20%10%36%5%35%45%7%32%
2178
April1st to 10thNight
12%5%25%5%2445%7%49%
1922
11th to 20thNight
12%8%35%5%2445%7%46%
1707
21st to endNight
18%7%24423446%45%
1620
May1st to 10thNight
15%7%35%5%346%5%7%40%
1620
11th to 20thNight
13%5%26%434347%47%
1593
21st to endNight
13%6%36%6%3445%8%44%
1705
June1st to 10thNight
5%3144335%7%8%56%
1440
11th to 20thNight
7%312435%5%7%10%53%
1440
21st to endNight
32233345%6%11%58%
1448
July1st to 10thNight
6%4245%245%7%8%54%
1620
11th to 20thNight
422443446%9%60%
1620
21st to endNight
5%214435%5%7%10%54%
1772
August1st to 10thNight
5%3145%245%6%10%55%
1611
11th to 20thNight
8%31333345%9%59%
1600
21st to endNight
6%424323447%62%
1847
September1st to 10thNight
10%424324346%58%
1854
11th to 20thNight
10%324425%446%57%
1980
21st to endNight
9%423323436%62%
1980
October1st to 10thNight
12%5%25%32345%7%51%
2107
11th to 20thNight
13%5%2432233458%
2160
21st to endNight
14%6%24423345%53%
2376
November1st to 10thNight
7%423423347%60%
2341
11th to 20thNight
10%5%24434446%54%
2508
21st to endNight
14%6%34323446%52%
2660
December1st to 10thNight
9%6%35%6%3445%7%49%
2660
11th to 20thNight
11%9%35%42335%6%49%
3279
21st to endNight
18%14%6%10%5%23335%31%
4726

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
55%7%13%17%7%1
2848
11th to 20thDay
50%5%14%20%10%
2850
21st to endDay
53%7%13%19%8%
3135
February1st to 10thDay
47%7%15%19%10%2
1710
11th to 20thDay
43%6%12%24%13%3
1691
21st to endDay
42%5%14%24%13%2
1480
March1st to 10thDay
41%6%12%24%15%2
1971
11th to 20thDay
47%5%8%23%14%2
1980
21st to endDay
54%7%12%18%7%1
2178
April1st to 10thDay
40%6%12%25%15%2
2038
11th to 20thDay
42%7%13%23%14%2
2199
21st to endDay
45%7%10%25%12%1
2340
May1st to 10thDay
46%7%13%18%14%1
2340
11th to 20thDay
42%8%13%24%12%
2306
21st to endDay
46%9%14%20%10%2
2567
June1st to 10thDay
29%9%14%31%16%2
2520
11th to 20thDay
31%8%15%26%18%2
2520
21st to endDay
32%10%12%28%13%4
2505
July1st to 10thDay
30%7%15%30%14%3
2276
11th to 20thDay
28%8%14%26%20%4
2271
21st to endDay
28%8%16%31%15%1
2405
August1st to 10thDay
32%12%17%25%11%2
2314
11th to 20thDay
29%8%14%29%19%1
2301
21st to endDay
29%6%13%25%21%6%
2507
September1st to 10thDay
31%5%12%28%19%5%
2103
11th to 20thDay
31%7%11%28%21%2
1980
21st to endDay
29%410%30%25%1
1980
October1st to 10thDay
35%5%11%26%22%2
1833
11th to 20thDay
32%48%26%25%6%
1800
21st to endDay
36%412%23%19%5%
1980
November1st to 10thDay
29%414%29%21%3
1737
11th to 20thDay
34%5%11%28%20%2
1668
21st to endDay
39%5%12%26%17%1
1520
December1st to 10thDay
36%6%16%27%15%1
1520
11th to 20thDay
43%5%16%28%8%
1915
21st to endDay
61%5%10%16%7%1
2922
January1st to 10thNight
50%7%12%19%11%1
4108
11th to 20thNight
44%6%12%25%12%1
4120
21st to endNight
51%5%15%19%9%1
4532
February1st to 10thNight
46%5%12%20%14%4
2470
11th to 20thNight
38%6%13%23%16%3
2385
21st to endNight
37%5%11%24%18%5%
1776
March1st to 10thNight
36%5%11%29%15%3
1988
11th to 20thNight
42%410%25%16%3
1980
21st to endNight
52%6%12%19%8%2
2178
April1st to 10thNight
35%6%11%26%19%3
1922
11th to 20thNight
38%6%10%28%15%3
1707
21st to endNight
39%6%11%23%19%1
1620
May1st to 10thNight
42%8%13%21%14%2
1620
11th to 20thNight
38%6%13%23%19%1
1594
21st to endNight
39%7%17%22%12%3
1706
June1st to 10thNight
23%9%16%32%17%4
1440
11th to 20thNight
23%9%16%30%18%5%
1440
21st to endNight
19%7%16%32%22%4
1448
July1st to 10thNight
26%6%16%28%20%4
1575
11th to 20thNight
21%6%16%29%23%5%
1566
21st to endNight
22%8%15%33%20%2
1673
August1st to 10thNight
23%9%19%31%16%2
1601
11th to 20thNight
24%6%13%34%20%3
1600
21st to endNight
24%5%14%28%21%9%
1847
September1st to 10thNight
26%6%12%27%21%7%
1854
11th to 20thNight
27%5%10%32%22%3
1980
21st to endNight
24%5%9%28%31%3
1980
October1st to 10thNight
32%5%11%26%22%4
2107
11th to 20thNight
29%5%8%25%24%8%
2160
21st to endNight
35%410%22%25%3
2376
November1st to 10thNight
25%5%13%27%25%5%
2341
11th to 20thNight
31%412%29%22%3
2508
21st to endNight
35%412%27%20%2
2660
December1st to 10thNight
35%6%14%29%15%1
2660
11th to 20thNight
37%411%36%12%1
3281
21st to endNight
57%5%9%20%7%1
4726

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 10thDay
20%16%33%23%7%1
270
11th to 20thDay
23%16%33%21%7%
270
21st to endDay
18%10%41%26%6%
297
February1st to 10thDay
16%21%41%19%4
270
11th to 20thDay
13%15%44%21%6%1
267
21st to endDay
13%21%45%19%3
198
March1st to 10thDay
18%15%43%20%4
240
11th to 20thDay
30%13%30%19%6%1
240
21st to endDay
28%22%33%14%3
264
April1st to 10thDay
21%13%40%19%6%
298
11th to 20thDay
18%15%36%23%6%
477
21st to endDay
23%18%30%19%9%1
600
May1st to 10thDay
18%11%35%26%9%1
603
11th to 20thDay
17%9%32%27%12%1
625
21st to endDay
20%5%32%27%13%3
679
June1st to 10thDay
6%6%21%35%26%7%
630
11th to 20thDay
7%5%30%35%18%5%
630
21st to endDay
6%8%36%32%16%2
630
July1st to 10thDay
9%5%14%33%31%8%
621
11th to 20thDay
5%221%40%24%7%
618
21st to endDay
6%214%44%30%4
684
August1st to 10thDay
8%218%41%26%4
626
11th to 20thDay
9%317%40%25%5%
615
21st to endDay
10%318%33%30%6%
626
September1st to 10thDay
13%322%37%18%6%
393
11th to 20thDay
9%127%33%23%7%
270
21st to endDay
16%433%30%16%1
270
October1st to 10thDay
23%9%20%27%15%6%
270
11th to 20thDay
9%18%43%23%6%2
270
21st to endDay
16%22%32%21%7%3
297
November1st to 10thDay
15%11%37%23%11%2
270
11th to 20thDay
16%14%40%22%7%1
270
21st to endDay
22%11%34%24%7%1
270
December1st to 10thDay
9%14%40%29%6%2
270
11th to 20thDay
16%14%32%29%8%
270
21st to endDay
21%18%40%20%2
297
January1st to 10thNight
12%12%37%31%8%
950
11th to 20thNight
15%14%36%28%7%
950
21st to endNight
16%9%40%29%5%
1045
February1st to 10thNight
17%10%42%27%4
950
11th to 20thNight
13%12%39%31%4
914
21st to endNight
14%13%43%25%5%1
592
March1st to 10thNight
13%16%36%28%7%
548
11th to 20thNight
20%10%35%30%4
540
21st to endNight
24%12%38%22%4
594
April1st to 10thNight
14%15%42%24%5%
540
11th to 20thNight
16%12%38%29%5%
533
21st to endNight
21%10%35%26%8%
540
May1st to 10thNight
16%11%34%31%7%
540
11th to 20thNight
17%7%33%33%9%1
531
21st to endNight
15%5%33%32%15%1
584
June1st to 10thNight
7%322%45%22%1
540
11th to 20thNight
7%329%44%16%
540
21st to endNight
5%333%45%14%
540
July1st to 10thNight
6%214%44%31%2
525
11th to 20thNight
4218%49%26%1
522
21st to endNight
4115%53%27%1
591
August1st to 10thNight
5%216%50%25%2
537
11th to 20thNight
8%115%48%25%3
534
21st to endNight
6%218%44%27%3
594
September1st to 10thNight
10%424%37%22%2
540
11th to 20thNight
12%223%40%22%1
540
21st to endNight
9%6%29%40%14%1
540
October1st to 10thNight
13%8%30%33%13%2
667
11th to 20thNight
14%10%38%30%8%
720
21st to endNight
18%10%32%32%7%
792
November1st to 10thNight
8%13%30%38%10%
861
11th to 20thNight
12%12%39%29%7%
950
21st to endNight
17%11%33%30%9%
950
December1st to 10thNight
12%12%37%31%7%
950
11th to 20thNight
18%10%33%32%7%
950
21st to endNight
18%15%35%28%5%
1045
Page generated at 2024-02-17 05:28:36. Version ac07

Copyright 2024 Attilla Danko


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