Carrs Mill Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carrs Mill Park clear sky chart from 2005-11-05 to 2018-01-12.

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
38%
15665
21%
48390
11%
15626
49%
15626
25%
30248

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 15thNight
21%
762
21%
2588
8%
761
38%
761
19%
1596
January16th to endNight
19%
768
23%
2496
6%
768
39%
768
21%
1559
February1st to 15thNight
20%
703
19%
2287
5%
701
38%
701
20%
1406
February16th to endNight
17%
631
24%
1916
5%
631
39%
631
21%
1224
March1st to 15thNight
25%
720
21%
2012
9%
720
38%
720
23%
1308
March16th to endNight
23%
768
20%
2083
8%
768
34%
768
24%
1389
April1st to 15thNight
27%
718
19%
1796
5%
718
35%
718
28%
1206
April16th to endNight
39%
720
19%
1800
7%
720
45%
720
30%
1208
May1st to 15thNight
36%
541
18%
1621
10%
541
43%
541
23%
1080
May16th to endNight
50%
374
17%
1497
15%
374
57%
374
23%
880
June1st to 15thNight
53%
360
19%
1440
19%
360
62%
360
25%
819
June16th to endNight
62%
360
17%
1440
19%
360
68%
360
25%
812
July1st to 15thNight
57%
340
12%
1360
15%
340
60%
340
18%
878
July16th to endNight
71%
529
16%
1560
14%
496
75%
496
37%
870
August1st to 15thNight
67%
539
18%
1609
14%
536
68%
536
31%
1003
August16th to endNight
65%
755
21%
1901
13%
755
66%
755
35%
1233
September1st to 15thNight
57%
720
25%
1800
14%
720
62%
720
35%
1166
September16th to endNight
56%
717
25%
1973
21%
717
60%
717
31%
1279
October1st to 15thNight
48%
720
23%
2160
20%
720
55%
720
27%
1375
October16th to endNight
38%
768
30%
2304
18%
768
54%
768
33%
1324
November1st to 15thNight
38%
760
24%
2427
15%
760
51%
760
27%
1463
November16th to endNight
31%
780
23%
2678
13%
780
46%
780
22%
1583
December1st to 15thNight
26%
780
17%
2730
6%
780
40%
780
17%
1764
December16th to endNight
21%
832
21%
2912
7%
832
39%
832
19%
1823

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
14%5%25%5%3445%7%41%
48937
Night
13%5%2442445%7%43%
48572
Cloud CoverDay
14%5%245%3445%7%41%
48947
Night
14%5%2442445%7%43%
48576
TransparencyDay
40%5%12%23%15%2
48637
Night
39%5%11%23%16%3
48390
SeeingDay
17%7%23%25%18%7%
6014
Night
16%9%28%29%13%1
15670

By Month

Percentage Cloud Cover NE (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 15thDay
14%7%25%5%25%5%5%6%40%
1591
16th to endDay
14%7%35%425%35%6%41%
1728
February1st to 15thDay
13%7%26%5%345%6%5%38%
1575
16th to endDay
13%8%35%5%33346%41%
1555
March1st to 15thDay
14%6%25%5%34346%42%
1936
16th to endDay
15%7%35%6%23446%40%
2139
April1st to 15thDay
15%5%25%5%2345%8%41%
2152
16th to endDay
17%434423346%43%
2160
May1st to 15thDay
16%6%35%5%245%5%8%36%
2337
16th to endDay
16%4245%35%5%49%38%
2618
June1st to 15thDay
12%4245%35%5%6%10%39%
2520
16th to endDay
10%4244245%5%9%44%
2520
July1st to 15thDay
9%5%25%5%37%5%6%9%39%
2520
16th to endDay
7%4246%36%7%7%10%38%
2498
August1st to 15thDay
11%425%5%45%7%7%7%36%
2337
16th to endDay
12%5%244345%6%7%42%
2292
September1st to 15thDay
15%424424348%45%
2160
16th to endDay
15%6%145%2445%7%41%
1985
October1st to 15thDay
19%5%14323346%43%
1800
16th to endDay
13%5%2432346%5%48%
1920
November1st to 15thDay
13%6%2442345%7%44%
1761
16th to endDay
15%5%24424445%46%
1609
December1st to 15thDay
16%425%5%3446%7%39%
1560
16th to endDay
16%6%25%5%24448%38%
1664
January1st to 15thNight
15%6%35%42345%7%41%
2588
16th to endNight
16%5%2442445%5%42%
2496
February1st to 15thNight
14%6%24433447%43%
2285
16th to endNight
13%7%25%423447%42%
1916
March1st to 15thNight
16%5%23425%45%6%42%
2000
16th to endNight
15%6%35%423447%42%
2083
April1st to 15thNight
12%5%345%35%46%7%41%
1796
16th to endNight
16%5%2442435%8%43%
1800
May1st to 15thNight
18%6%35%424447%38%
1621
16th to endNight
12%6%2442446%8%42%
1495
June1st to 15thNight
10%424425%5%6%9%44%
1440
16th to endNight
8%4245%35%46%10%43%
1440
July1st to 15thNight
8%5%36%6%47%5%8%7%35%
1440
16th to endNight
5%412425%6%7%11%47%
1667
August1st to 15thNight
9%5%15%4345%7%9%43%
1620
16th to endNight
10%424425%5%5%8%45%
1901
September1st to 15thNight
12%5%25%3235%48%47%
1800
16th to endNight
13%5%15%5%34346%46%
1973
October1st to 15thNight
19%424324445%44%
2160
16th to endNight
14%313313347%52%
2304
November1st to 15thNight
13%5%35%323345%49%
2427
16th to endNight
15%42432445%7%45%
2678
December1st to 15thNight
15%6%36%5%35%5%46%37%
2730
16th to endNight
15%6%25%5%2445%7%40%
2912

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 15thDay
15%6%25%4346%45%41%
1591
16th to endDay
14%6%45%434446%41%
1728
February1st to 15thDay
13%7%25%6%245%6%5%39%
1575
16th to endDay
13%8%35%5%24346%41%
1555
March1st to 15thDay
14%6%34434346%43%
1947
16th to endDay
16%6%35%5%24445%40%
2138
April1st to 15thDay
14%5%246%2345%8%42%
2152
16th to endDay
17%5%24423345%45%
2160
May1st to 15thDay
16%5%35%5%2445%8%37%
2337
16th to endDay
15%425%6%3446%8%38%
2618
June1st to 15thDay
11%4245%35%5%6%10%40%
2520
16th to endDay
11%4245%25%5%6%9%43%
2520
July1st to 15thDay
9%425%6%36%5%7%8%40%
2520
16th to endDay
8%3246%36%7%7%10%38%
2498
August1st to 15thDay
12%5%247%46%6%6%7%37%
2337
16th to endDay
12%5%23435%6%5%8%41%
2292
September1st to 15thDay
14%4235%3435%6%45%
2160
16th to endDay
15%6%25%5%2435%7%41%
1985
October1st to 15thDay
19%414323446%44%
1800
16th to endDay
14%5%1442345%5%48%
1920
November1st to 15thDay
14%5%3432436%6%45%
1761
16th to endDay
16%5%24324345%47%
1609
December1st to 15thDay
16%426%43445%7%40%
1560
16th to endDay
16%7%25%5%34447%38%
1664
January1st to 15thNight
15%6%25%42445%7%42%
2588
16th to endNight
16%6%2342445%6%43%
2496
February1st to 15thNight
14%6%24434446%44%
2278
16th to endNight
14%6%26%423446%43%
1916
March1st to 15thNight
16%5%243245%5%6%44%
2012
16th to endNight
15%6%36%423447%41%
2083
April1st to 15thNight
13%434425%5%5%8%42%
1796
16th to endNight
16%42442345%7%43%
1800
May1st to 15thNight
19%7%2442345%7%38%
1620
16th to endNight
13%6%14425%5%5%9%42%
1495
June1st to 15thNight
11%3244246%7%9%43%
1440
16th to endNight
8%425%435%46%10%43%
1440
July1st to 15thNight
9%5%26%7%47%6%6%8%35%
1440
16th to endNight
6%3234246%8%12%46%
1667
August1st to 15thNight
9%425%425%5%7%7%44%
1620
16th to endNight
10%4245%345%5%8%45%
1901
September1st to 15thNight
12%5%24423447%47%
1800
16th to endNight
13%5%25%5%34446%45%
1973
October1st to 15thNight
18%424334445%45%
2160
16th to endNight
14%413323446%52%
2304
November1st to 15thNight
13%6%25%413345%49%
2427
16th to endNight
15%42332445%6%45%
2678
December1st to 15thNight
15%6%25%5%35%5%5%5%38%
2730
16th to endNight
16%5%25%5%3345%6%40%
2912

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 15thDay
42%6%12%22%12%3
1592
16th to endDay
43%412%23%12%3
1728
February1st to 15thDay
43%410%26%12%2
1577
16th to endDay
44%311%26%12%1
1555
March1st to 15thDay
42%411%23%15%2
1947
16th to endDay
45%5%10%19%17%2
2139
April1st to 15thDay
40%410%23%17%3
2152
16th to endDay
40%49%18%20%5%
2160
May1st to 15thDay
44%6%12%20%14%1
2337
16th to endDay
42%5%14%22%12%1
2622
June1st to 15thDay
37%8%13%26%13%
2520
16th to endDay
35%8%14%22%17%1
2520
July1st to 15thDay
38%7%13%22%14%2
2371
16th to endDay
35%9%14%25%14%2
2342
August1st to 15thDay
41%7%13%21%15%1
2324
16th to endDay
37%6%13%23%16%2
2292
September1st to 15thDay
37%5%12%21%20%2
2160
16th to endDay
40%47%23%20%2
1985
October1st to 15thDay
40%410%23%17%3
1800
16th to endDay
36%49%28%20%1
1920
November1st to 15thDay
39%312%21%17%5%
1761
16th to endDay
39%49%27%17%1
1609
December1st to 15thDay
41%5%14%24%11%2
1560
16th to endDay
44%411%25%12%
1664
January1st to 15thNight
41%411%20%17%4
2588
16th to endNight
41%411%26%15%1
2496
February1st to 15thNight
40%313%24%15%2
2287
16th to endNight
41%49%25%17%2
1916
March1st to 15thNight
39%5%11%27%13%2
2012
16th to endNight
42%411%20%17%2
2083
April1st to 15thNight
39%5%11%21%19%3
1796
16th to endNight
38%5%10%20%17%7%
1800
May1st to 15thNight
45%410%22%14%2
1621
16th to endNight
37%7%17%20%14%2
1497
June1st to 15thNight
33%8%12%27%16%
1440
16th to endNight
35%6%13%25%17%2
1440
July1st to 15thNight
44%7%13%17%12%4
1360
16th to endNight
26%8%20%25%17%2
1560
August1st to 15thNight
34%7%13%23%18%2
1609
16th to endNight
35%6%11%24%18%3
1901
September1st to 15thNight
35%5%11%21%21%3
1800
16th to endNight
39%48%21%21%3
1973
October1st to 15thNight
41%49%24%18%3
2160
16th to endNight
32%39%30%21%2
2304
November1st to 15thNight
37%48%24%18%6%
2427
16th to endNight
38%410%24%18%3
2678
December1st to 15thNight
45%5%11%23%12%1
2730
16th to endNight
43%413%23%13%1
2912

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 15thDay
20%20%33%17%7%1
95
16th to endDay
20%20%33%21%3
96
February1st to 15thDay
24%16%44%13%1
90
16th to endDay
18%17%42%20%1
214
March1st to 15thDay
18%14%33%27%5%
270
16th to endDay
20%13%37%21%5%2
288
April1st to 15thDay
17%13%32%20%12%3
270
16th to endDay
19%8%26%21%17%6%
270
May1st to 15thDay
26%12%25%18%11%6%
288
16th to endDay
19%318%26%24%8%
331
June1st to 15thDay
14%325%24%22%9%
315
16th to endDay
13%222%36%20%5%
315
July1st to 15thDay
13%119%29%26%9%
305
16th to endDay
7%19%32%34%14%
326
August1st to 15thDay
15%14%26%30%13%
313
16th to endDay
10%8%30%28%21%
332
September1st to 15thDay
14%318%20%24%18%
315
16th to endDay
19%211%30%21%14%
314
October1st to 15thDay
22%414%27%23%7%
315
16th to endDay
15%8%29%29%13%3
336
November1st to 15thDay
17%5%28%27%19%2
291
16th to endDay
18%12%35%19%12%1
139
December1st to 15thDay
15%21%30%16%12%4
90
16th to endDay
25%7%43%18%5%
96
January1st to 15thNight
17%18%36%23%4
765
16th to endNight
20%16%39%21%1
768
February1st to 15thNight
19%16%37%24%1
704
16th to endNight
19%19%39%19%1
631
March1st to 15thNight
20%14%34%26%3
720
16th to endNight
18%14%39%20%5%1
768
April1st to 15thNight
16%14%38%24%5%
718
16th to endNight
18%7%29%31%11%1
720
May1st to 15thNight
21%6%28%30%12%
541
16th to endNight
16%419%35%20%2
375
June1st to 15thNight
11%222%35%26%
360
16th to endNight
10%116%49%21%
360
July1st to 15thNight
9%115%44%28%
340
16th to endNight
5%112%44%30%5%
529
August1st to 15thNight
13%10%43%28%3
539
16th to endNight
12%211%37%29%5%
755
September1st to 15thNight
14%218%33%28%3
720
16th to endNight
15%315%32%27%5%
717
October1st to 15thNight
20%5%19%30%20%3
720
16th to endNight
16%10%32%27%12%
768
November1st to 15thNight
16%8%29%31%11%1
760
16th to endNight
17%16%28%27%8%
780
December1st to 15thNight
20%12%34%23%9%
780
16th to endNight
19%12%41%25%1
832
Page generated at 2018-01-12 22:01:30. Version ac04

Copyright 2018 A. Danko


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