Orion Acres
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Orion Acres clear sky chart from 2005-11-06 to 2024-01-16.

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
45%
23629
20%
74558
15%
23574
52%
23574
24%
47567

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
21%
760
19%
2459
9%
757
34%
757
16%
1653
January11th to 20thNight
21%
744
18%
2417
9%
744
32%
744
14%
1732
January21st to endNight
24%
792
23%
2456
10%
792
37%
792
20%
1617
February1st to 10thNight
25%
720
19%
2160
10%
720
34%
720
20%
1470
February11th to 20thNight
19%
703
16%
2098
7%
699
27%
699
15%
1507
February21st to endNight
20%
592
19%
1776
8%
592
29%
592
15%
1294
March1st to 10thNight
27%
720
21%
2160
11%
720
36%
720
23%
1402
March11th to 20thNight
27%
720
17%
2004
8%
720
35%
720
20%
1405
March21st to endNight
31%
792
18%
2178
10%
792
36%
792
22%
1498
April1st to 10thNight
40%
545
25%
1805
16%
545
51%
545
27%
1060
April11th to 20thNight
37%
533
27%
1775
17%
533
51%
533
30%
1014
April21st to endNight
46%
540
23%
1707
16%
540
53%
540
29%
1020
May1st to 10thNight
45%
540
21%
1620
12%
540
53%
540
30%
1007
May11th to 20thNight
52%
531
17%
1593
12%
531
57%
531
26%
1031
May21st to endNight
63%
582
18%
1744
15%
582
65%
582
28%
1100
June1st to 10thNight
61%
540
17%
1620
13%
540
63%
540
27%
1029
June11th to 20thNight
75%
540
18%
1620
15%
540
78%
540
43%
870
June21st to endNight
71%
540
17%
1620
13%
540
73%
540
34%
966
July1st to 10thNight
67%
525
11%
1575
11%
525
67%
525
25%
1050
July11th to 20thNight
71%
522
16%
1566
15%
522
72%
522
32%
959
July21st to endNight
71%
591
17%
1672
16%
558
72%
558
28%
1068
August1st to 10thNight
72%
537
16%
1629
15%
534
74%
534
29%
1023
August11th to 20thNight
66%
534
15%
1776
16%
534
67%
534
23%
1163
August21st to endNight
68%
594
18%
1980
21%
594
69%
594
24%
1261
September1st to 10thNight
66%
612
21%
1872
19%
612
68%
612
30%
1172
September11th to 20thNight
60%
720
23%
1980
18%
720
62%
720
29%
1291
September21st to endNight
62%
720
29%
1980
20%
720
67%
720
37%
1171
October1st to 10thNight
58%
720
31%
1980
25%
720
64%
720
41%
1119
October11th to 20thNight
44%
720
27%
2020
18%
720
54%
720
30%
1259
October21st to endNight
47%
792
29%
2495
25%
792
56%
792
31%
1461
November1st to 10thNight
49%
740
26%
2406
23%
740
57%
740
30%
1379
November11th to 20thNight
37%
760
27%
2470
18%
760
50%
760
28%
1433
November21st to endNight
36%
760
24%
2470
17%
760
46%
760
23%
1562
December1st to 10thNight
30%
760
19%
2470
12%
760
38%
760
16%
1725
December11th to 20thNight
33%
759
23%
2956
16%
759
43%
759
18%
1837
December21st to endNight
27%
829
12%
4449
11%
817
36%
817
9%
2959

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
13%7%36%6%45%5%6%7%37%
74881
Night
13%7%36%5%345%6%7%41%
74935
TransparencyDay
43%7%11%19%15%3
74604
Night
40%7%12%21%17%4
74731
SeeingDay
19%12%23%22%16%8%
13547
Night
17%10%22%28%19%4
23639

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
17%10%46%5%345%5%6%35%
1706
11th to 20thDay
22%10%48%5%24445%33%
1671
21st to endDay
16%7%37%5%235%5%5%42%
1898
February1st to 10thDay
18%11%5%7%4345%46%34%
1800
11th to 20thDay
23%8%46%6%3445%433%
1748
21st to endDay
20%10%37%5%25%446%34%
1480
March1st to 10thDay
15%7%36%5%445%5%7%39%
1800
11th to 20thDay
20%9%38%5%345%5%5%34%
1953
21st to endDay
16%9%37%6%45%5%5%8%32%
2186
April1st to 10thDay
11%8%35%6%35%5%5%8%42%
2160
11th to 20thDay
14%8%35%5%34447%43%
2134
21st to endDay
13%7%35%6%35%5%6%7%40%
2250
May1st to 10thDay
14%6%35%5%35%5%6%7%41%
2340
11th to 20thDay
13%7%37%7%45%6%6%7%35%
2301
21st to endDay
10%6%25%7%5%6%6%6%9%37%
2531
June1st to 10thDay
10%6%37%7%5%7%6%7%9%35%
2340
11th to 20thDay
5%5%26%6%46%7%8%10%41%
2340
21st to endDay
7%5%26%7%47%7%8%10%37%
2340
July1st to 10thDay
8%7%38%10%5%8%7%7%9%28%
2340
11th to 20thDay
11%6%37%7%5%8%8%8%10%28%
2340
21st to endDay
8%6%38%8%6%8%8%8%11%27%
2547
August1st to 10thDay
9%7%26%8%6%9%7%8%9%28%
2293
11th to 20thDay
10%5%38%8%5%8%7%7%9%29%
2125
21st to endDay
12%6%37%8%48%8%7%7%29%
2376
September1st to 10thDay
13%5%26%7%47%7%6%7%36%
2068
11th to 20thDay
13%7%37%6%345%6%7%39%
1980
21st to endDay
12%5%25%6%35%45%6%46%
1980
October1st to 10thDay
11%5%25%5%34345%52%
1980
11th to 20thDay
12%5%2443435%6%52%
1938
21st to endDay
14%6%3442446%6%48%
1857
November1st to 10thDay
11%6%25%42434455%
1672
11th to 20thDay
13%6%36%433446%48%
1710
21st to endDay
16%8%25%4345%5%7%42%
1710
December1st to 10thDay
20%11%46%434445%34%
1710
11th to 20thDay
13%10%37%6%45%446%37%
2153
21st to endDay
17%10%7%6%5%2445%8%31%
3124
January1st to 10thNight
17%9%37%6%24446%38%
2459
11th to 20thNight
19%9%5%8%6%35%46%5%30%
2417
21st to endNight
14%9%46%5%34445%40%
2456
February1st to 10thNight
17%9%46%6%3445%5%37%
2160
11th to 20thNight
21%10%46%6%35%44335%
2098
21st to endNight
24%10%46%434445%31%
1776
March1st to 10thNight
15%6%35%6%45%46%7%40%
2160
11th to 20thNight
16%10%46%5%3445%6%36%
2004
21st to endNight
13%8%37%6%35%5%5%7%39%
2178
April1st to 10thNight
12%5%345%25%5%5%8%47%
1805
11th to 20thNight
13%6%35%32345%8%48%
1775
21st to endNight
11%6%34436%45%8%46%
1707
May1st to 10thNight
10%5%35%5%345%5%8%47%
1620
11th to 20thNight
11%6%26%5%45%5%5%9%43%
1592
21st to endNight
8%5%37%5%46%5%6%10%41%
1744
June1st to 10thNight
8%5%37%6%45%47%10%41%
1620
11th to 20thNight
4213335%5%7%12%53%
1620
21st to endNight
5%425%435%6%7%13%45%
1620
July1st to 10thNight
9%5%36%5%36%7%8%11%36%
1620
11th to 20thNight
9%4245%35%6%8%11%43%
1620
21st to endNight
6%6%35%5%36%8%9%12%37%
1771
August1st to 10thNight
5%5%245%5%6%6%8%12%42%
1640
11th to 20thNight
8%6%26%6%5%46%7%9%40%
1776
21st to endNight
11%5%25%5%35%7%8%11%39%
1980
September1st to 10thNight
9%5%35%5%45%5%7%8%44%
1872
11th to 20thNight
13%5%344445%6%7%44%
1980
21st to endNight
9%6%2442436%7%53%
1980
October1st to 10thNight
10%414423346%59%
1980
11th to 20thNight
13%6%26%42435%5%49%
2020
21st to endNight
15%7%24323336%51%
2495
November1st to 10thNight
12%6%25%424447%51%
2406
11th to 20thNight
11%8%35%43336%5%49%
2470
21st to endNight
16%9%36%42445%5%42%
2470
December1st to 10thNight
20%8%5%6%5%35%446%33%
2470
11th to 20thNight
16%8%46%5%2445%6%40%
3042
21st to endNight
18%9%7%8%6%45%5%6%7%27%
4532

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
48%5%7%20%16%3
1707
11th to 20thDay
54%47%17%15%2
1671
21st to endDay
42%5%9%23%19%3
1898
February1st to 10thDay
52%48%18%16%3
1800
11th to 20thDay
53%47%18%15%3
1758
21st to endDay
50%49%13%18%6%
1480
March1st to 10thDay
43%6%9%17%19%7%
1800
11th to 20thDay
51%5%10%15%15%3
1953
21st to endDay
50%6%10%21%12%1
2186
April1st to 10thDay
40%7%11%21%17%3
2160
11th to 20thDay
41%5%8%19%23%4
2134
21st to endDay
41%6%10%27%14%2
2250
May1st to 10thDay
40%7%12%26%12%3
2340
11th to 20thDay
46%9%14%19%12%
2305
21st to endDay
41%10%13%21%13%2
2531
June1st to 10thDay
41%9%15%21%12%1
2340
11th to 20thDay
34%10%18%23%13%2
2340
21st to endDay
37%12%19%17%12%3
2340
July1st to 10thDay
46%12%14%18%8%2
2275
11th to 20thDay
45%13%16%14%9%3
2271
21st to endDay
44%13%16%20%7%1
2405
August1st to 10thDay
45%13%17%17%7%1
2280
11th to 20thDay
46%12%14%17%10%1
2125
21st to endDay
48%11%14%14%10%3
2376
September1st to 10thDay
43%10%12%16%14%5%
2068
11th to 20thDay
43%7%10%20%18%2
1980
21st to endDay
37%7%10%22%19%6%
1980
October1st to 10thDay
34%6%8%20%25%7%
1980
11th to 20thDay
33%49%21%23%9%
1938
21st to endDay
36%47%22%25%6%
1857
November1st to 10thDay
33%47%20%29%7%
1672
11th to 20thDay
38%46%21%23%7%
1710
21st to endDay
41%48%20%22%5%
1710
December1st to 10thDay
53%46%20%14%3
1710
11th to 20thDay
47%5%9%17%19%4
2150
21st to endDay
49%5%11%19%12%3
3124
January1st to 10thNight
48%5%8%19%17%4
2459
11th to 20thNight
54%5%8%17%13%3
2417
21st to endNight
46%48%22%17%3
2456
February1st to 10thNight
48%410%19%16%3
2160
11th to 20thNight
53%5%6%16%15%5%
2099
21st to endNight
54%5%7%16%13%5%
1776
March1st to 10thNight
42%5%9%16%19%8%
2160
11th to 20thNight
47%6%10%19%15%3
2004
21st to endNight
45%7%10%23%15%2
2178
April1st to 10thNight
35%6%12%23%21%3
1805
11th to 20thNight
33%5%10%22%23%7%
1775
21st to endNight
36%6%13%27%17%1
1707
May1st to 10thNight
35%8%13%24%20%2
1620
11th to 20thNight
38%9%18%22%13%1
1593
21st to endNight
35%10%16%24%13%2
1745
June1st to 10thNight
38%8%16%23%12%3
1620
11th to 20thNight
22%9%22%32%14%2
1620
21st to endNight
30%9%19%25%13%4
1620
July1st to 10thNight
37%13%19%18%11%2
1575
11th to 20thNight
30%11%22%20%12%5%
1566
21st to endNight
33%13%20%23%10%2
1672
August1st to 10thNight
32%12%21%25%9%
1629
11th to 20thNight
36%14%18%17%14%2
1776
21st to endNight
36%12%17%20%12%2
1980
September1st to 10thNight
34%10%17%21%15%4
1872
11th to 20thNight
37%9%12%19%21%2
1980
21st to endNight
31%5%11%24%22%6%
1980
October1st to 10thNight
27%410%24%25%9%
1980
11th to 20thNight
37%5%8%20%21%8%
2020
21st to endNight
36%36%22%25%8%
2495
November1st to 10thNight
33%5%7%21%25%9%
2406
11th to 20thNight
36%47%20%26%8%
2470
21st to endNight
44%36%20%22%5%
2470
December1st to 10thNight
51%6%8%17%15%3
2470
11th to 20thNight
42%6%8%17%23%4
3044
21st to endNight
52%6%10%19%11%2
4532

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
37%19%30%12%2
270
11th to 20thDay
39%22%26%9%41
257
21st to endDay
27%30%32%9%2
264
February1st to 10thDay
35%25%28%11%2
240
11th to 20thDay
46%24%24%6%
240
21st to endDay
41%25%28%5%2
198
March1st to 10thDay
29%22%36%11%11
240
11th to 20thDay
29%24%24%18%5%1
393
21st to endDay
26%20%30%15%8%1
462
April1st to 10thDay
24%15%29%21%10%1
420
11th to 20thDay
20%17%31%21%10%1
412
21st to endDay
22%14%29%21%11%3
420
May1st to 10thDay
18%15%31%22%10%5%
423
11th to 20thDay
12%9%29%25%17%8%
447
21st to endDay
15%7%20%28%16%14%
485
June1st to 10thDay
14%6%18%26%21%15%
450
11th to 20thDay
6%5%16%31%25%17%
450
21st to endDay
8%5%25%26%20%16%
450
July1st to 10thDay
10%317%25%26%18%
445
11th to 20thDay
10%5%11%26%26%22%
444
21st to endDay
9%410%27%29%21%
488
August1st to 10thDay
12%414%24%27%18%
446
11th to 20thDay
12%416%28%30%10%
439
21st to endDay
14%410%25%32%14%
495
September1st to 10thDay
10%415%25%33%13%
450
11th to 20thDay
13%5%16%27%29%11%
450
21st to endDay
14%6%17%29%29%5%
450
October1st to 10thDay
13%8%19%31%20%8%
450
11th to 20thDay
15%14%28%26%14%3
450
21st to endDay
21%10%32%21%13%2
372
November1st to 10thDay
20%12%35%21%10%2
270
11th to 20thDay
17%19%39%21%4
270
21st to endDay
22%17%36%17%8%1
270
December1st to 10thDay
35%17%29%16%31
270
11th to 20thDay
25%23%29%16%7%
270
21st to endDay
35%18%32%12%3
297
January1st to 10thNight
26%19%29%22%4
760
11th to 20thNight
26%18%29%21%5%
744
21st to endNight
21%18%33%24%3
792
February1st to 10thNight
23%17%31%24%5%
720
11th to 20thNight
29%21%29%20%2
703
21st to endNight
32%19%27%21%2
592
March1st to 10thNight
21%15%33%27%4
720
11th to 20thNight
21%17%29%25%8%1
720
21st to endNight
20%15%29%27%9%
792
April1st to 10thNight
16%13%28%32%11%
545
11th to 20thNight
17%12%31%27%11%1
533
21st to endNight
15%7%28%35%14%1
540
May1st to 10thNight
11%7%31%30%20%2
540
11th to 20thNight
13%7%20%32%23%6%
531
21st to endNight
10%412%36%32%6%
584
June1st to 10thNight
9%414%35%32%6%
540
11th to 20thNight
5%111%33%37%13%
540
21st to endNight
7%211%35%36%9%
540
July1st to 10thNight
10%110%26%42%11%
525
11th to 20thNight
9%47%25%39%15%
522
21st to endNight
8%27%29%42%12%
591
August1st to 10thNight
8%28%25%48%10%
537
11th to 20thNight
10%210%33%36%8%
534
21st to endNight
13%17%29%41%9%
594
September1st to 10thNight
12%210%29%39%9%
612
11th to 20thNight
15%414%26%35%7%
720
21st to endNight
11%416%31%34%4
720
October1st to 10thNight
12%6%19%27%28%8%
720
11th to 20thNight
17%8%24%29%19%2
720
21st to endNight
19%10%21%34%14%3
792
November1st to 10thNight
15%10%23%32%19%2
740
11th to 20thNight
16%14%28%30%10%1
760
21st to endNight
21%13%25%31%11%1
760
December1st to 10thNight
26%14%25%28%6%
760
11th to 20thNight
22%13%28%28%8%1
760
21st to endNight
27%16%25%28%5%
836
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