MacKay Tourist Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the MacKay Tourist 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
57%
15745
20%
48367
16%
15714
62%
15714
33%
27817

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
54%
760
15%
2661
13%
760
59%
760
24%
1605
January16th to endNight
53%
768
19%
2637
17%
768
59%
768
27%
1535
February1st to 15thNight
46%
700
13%
2285
10%
697
51%
697
24%
1428
February16th to endNight
46%
632
16%
1895
11%
632
54%
632
28%
1188
March1st to 15thNight
50%
720
14%
2084
9%
720
55%
720
29%
1322
March16th to endNight
44%
768
15%
2112
8%
768
49%
768
28%
1382
April1st to 15thNight
46%
674
16%
1787
7%
674
51%
674
29%
1162
April16th to endNight
49%
540
19%
1620
11%
540
53%
540
31%
974
May1st to 15thNight
54%
539
18%
1619
15%
539
59%
539
38%
896
May16th to endNight
56%
490
13%
1588
14%
490
59%
490
24%
1014
June1st to 15thNight
61%
360
17%
1260
16%
360
68%
360
30%
700
June16th to endNight
73%
360
27%
1260
32%
360
80%
360
50%
555
July1st to 15thNight
80%
340
21%
1346
32%
340
84%
340
52%
538
July16th to endNight
81%
418
29%
1455
36%
393
84%
393
57%
566
August1st to 15thNight
76%
539
27%
1611
23%
536
78%
536
52%
792
August16th to endNight
77%
579
36%
1725
28%
579
79%
579
54%
808
September1st to 15thNight
76%
720
31%
1917
22%
720
80%
720
56%
988
September16th to endNight
69%
716
32%
1980
26%
716
73%
716
47%
1090
October1st to 15thNight
62%
720
25%
2064
18%
720
68%
720
42%
1137
October16th to endNight
60%
768
26%
2430
22%
768
68%
768
37%
1328
November1st to 15thNight
57%
760
21%
2470
20%
760
61%
760
31%
1414
November16th to endNight
50%
897
19%
2652
12%
897
57%
897
30%
1591
December1st to 15thNight
48%
975
14%
2827
9%
975
52%
975
28%
1806
December16th to endNight
47%
1002
16%
3082
11%
1002
52%
1002
23%
1998

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
45%25%5%35%5%6%8%46%
48976
Night
24244345%6%8%51%
48543
TransparencyDay
32%9%15%20%15%6%
48651
Night
27%9%17%23%16%5%
48368
SeeingDay
9%16%32%26%12%3
5983
Night
45%25%37%21%4
15756

By Month

Percentage Cloud Cover SW (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%26%435%6%7%11%44%
1520
16th to endDay
17%35%6%245%8%10%43%
1584
February1st to 15thDay
1445%446%5%7%12%43%
1575
16th to endDay
16%5%8%8%36%5%7%10%36%
1579
March1st to 15thDay
28%36%436%6%8%11%38%
1875
16th to endDay
48%36%5%36%6%8%10%35%
2112
April1st to 15thDay
49%46%5%36%6%7%9%35%
2158
16th to endDay
5%6%36%5%35%6%6%8%42%
2340
May1st to 15thDay
46%26%6%36%5%7%9%42%
2331
16th to endDay
8%9%410%8%46%6%6%7%28%
2522
June1st to 15thDay
8%7%37%6%35%5%8%9%35%
2700
16th to endDay
331442345%7%59%
2700
July1st to 15thDay
43134245%5%8%56%
2530
16th to endDay
4314423446%60%
2614
August1st to 15thDay
3324425%6%5%7%52%
2340
16th to endDay
232342445%6%60%
2474
September1st to 15thDay
5%414323346%59%
2043
16th to endDay
7%5%1432335%6%55%
1980
October1st to 15thDay
6%5%25%42445%7%48%
1896
16th to endDay
3424425%6%6%8%51%
1794
November1st to 15thDay
3426%5%36%6%6%8%46%
1719
16th to endDay
25%35%5%246%7%10%45%
1623
December1st to 15thDay
25%25%7%46%6%7%9%42%
1462
16th to endDay
37%47%5%35%6%7%11%39%
1505
January1st to 15thNight
15%145%35%5%8%11%46%
2661
16th to endNight
17%25%6%335%6%10%48%
2637
February1st to 15thNight
5%36%6%36%5%6%9%45%
2274
16th to endNight
26%46%5%3446%11%43%
1895
March1st to 15thNight
15%345%35%6%7%10%44%
2084
16th to endNight
38%25%5%35%5%6%9%44%
2112
April1st to 15thNight
48%344346%7%9%41%
1787
16th to endNight
44245%25%5%6%9%48%
1620
May1st to 15thNight
23143246%7%8%55%
1619
16th to endNight
8%7%245%35%6%6%9%39%
1587
June1st to 15thNight
5%415%435%5%5%8%49%
1260
16th to endNight
211232345%5%66%
1260
July1st to 15thNight
11221446%8%65%
1426
16th to endNight
111313436%71%
1554
August1st to 15thNight
2124345%6%8%61%
1620
16th to endNight
22221435%6%67%
1725
September1st to 15thNight
2212313345%70%
1917
16th to endNight
5%31331335%5%61%
1980
October1st to 15thNight
6%41232346%7%57%
2064
16th to endNight
33144245%6%9%53%
2430
November1st to 15thNight
3424435%5%7%8%49%
2470
16th to endNight
14145%36%6%7%9%49%
2652
December1st to 15thNight
26%25%5%45%5%7%9%44%
2827
16th to endNight
27%36%5%36%5%7%8%42%
3082

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
29%16%22%20%9%2
1520
16th to endDay
33%10%20%21%10%3
1584
February1st to 15thDay
31%14%25%18%9%
1575
16th to endDay
41%12%19%18%6%1
1579
March1st to 15thDay
36%13%23%18%7%1
1875
16th to endDay
40%14%20%16%6%1
2112
April1st to 15thDay
40%12%20%17%8%
2158
16th to endDay
36%9%19%21%12%
2340
May1st to 15thDay
35%11%15%24%12%1
2331
16th to endDay
52%9%11%17%7%1
2525
June1st to 15thDay
41%9%13%21%11%3
2700
16th to endDay
22%48%20%34%8%
2700
July1st to 15thDay
23%5%7%18%26%18%
2381
16th to endDay
23%46%11%23%31%
2450
August1st to 15thDay
26%7%8%15%24%17%
2325
16th to endDay
22%5%7%21%26%16%
2474
September1st to 15thDay
24%49%19%27%14%
2043
16th to endDay
27%7%10%25%22%6%
1980
October1st to 15thDay
32%8%15%26%13%3
1896
16th to endDay
26%10%17%27%16%1
1794
November1st to 15thDay
33%10%21%18%14%2
1719
16th to endDay
31%11%21%22%9%3
1623
December1st to 15thDay
35%14%19%21%6%1
1462
16th to endDay
36%11%24%18%7%1
1505
January1st to 15thNight
29%15%20%21%10%2
2661
16th to endNight
30%10%18%23%12%4
2637
February1st to 15thNight
32%13%21%21%9%1
2285
16th to endNight
32%11%22%24%7%1
1895
March1st to 15thNight
29%14%22%22%10%
2084
16th to endNight
33%11%21%23%8%
2112
April1st to 15thNight
33%10%20%23%10%1
1787
16th to endNight
29%10%17%29%12%
1620
May1st to 15thNight
23%9%17%36%13%
1620
16th to endNight
38%9%17%23%10%
1588
June1st to 15thNight
29%8%14%27%16%3
1260
16th to endNight
16%48%23%35%11%
1260
July1st to 15thNight
13%410%20%30%19%
1346
16th to endNight
13%36%13%31%32%
1455
August1st to 15thNight
17%5%9%19%23%23%
1611
16th to endNight
15%48%20%30%19%
1725
September1st to 15thNight
17%48%21%34%14%
1917
16th to endNight
22%5%10%29%24%6%
1980
October1st to 15thNight
24%6%17%32%16%3
2064
16th to endNight
23%10%16%29%20%1
2430
November1st to 15thNight
27%10%19%24%13%3
2470
16th to endNight
27%12%19%23%14%2
2652
December1st to 15thNight
32%12%24%20%9%1
2827
16th to endNight
36%12%18%21%9%1
3082

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
4320%35%28%7%
82
16th to endDay
6%433%27%23%4
72
February1st to 15thDay
313%33%25%17%6%
90
16th to endDay
6%18%34%28%10%1
238
March1st to 15thDay
9%16%37%30%5%
270
16th to endDay
10%25%37%22%4
288
April1st to 15thDay
8%24%31%18%12%5%
269
16th to endDay
11%25%36%18%7%
270
May1st to 15thDay
12%21%35%22%6%1
288
16th to endDay
14%14%27%24%12%5%
354
June1st to 15thDay
13%13%24%29%13%5%
495
16th to endDay
6%16%23%30%18%4
495
July1st to 15thDay
7%10%36%28%13%3
315
16th to endDay
7%16%40%25%9%2
327
August1st to 15thDay
7%13%37%28%8%3
315
16th to endDay
6%12%37%25%14%4
332
September1st to 15thDay
9%16%31%22%13%6%
315
16th to endDay
12%17%29%24%14%1
315
October1st to 15thDay
12%17%28%26%12%1
231
16th to endDay
6%11%31%36%11%2
144
November1st to 15thDay
6%13%22%37%17%2
135
16th to endDay
5%16%36%31%8%1
135
December1st to 15thDay
12%37%31%13%5%
112
16th to endDay
416%32%31%13%2
96
January1st to 15thNight
37%26%41%18%3
764
16th to endNight
47%25%38%19%4
768
February1st to 15thNight
26%33%37%17%2
704
16th to endNight
46%31%37%16%4
632
March1st to 15thNight
3433%39%16%2
720
16th to endNight
7%8%33%34%14%1
768
April1st to 15thNight
6%9%29%33%15%5%
674
16th to endNight
5%9%30%35%16%2
540
May1st to 15thNight
39%27%32%23%4
540
16th to endNight
13%419%29%27%5%
492
June1st to 15thNight
8%321%39%23%3
360
16th to endNight
3118%44%27%4
360
July1st to 15thNight
2112%43%35%5%
340
16th to endNight
211%44%35%5%
418
August1st to 15thNight
4114%39%37%3
539
16th to endNight
3212%42%33%6%
579
September1st to 15thNight
3114%32%35%11%
720
16th to endNight
7%314%31%30%12%
716
October1st to 15thNight
8%5%20%37%21%6%
720
16th to endNight
45%24%39%20%5%
768
November1st to 15thNight
36%25%40%20%3
760
16th to endNight
39%30%38%14%4
897
December1st to 15thNight
47%32%40%13%2
975
16th to endNight
48%30%41%12%3
1002
Page generated at 2018-01-12 20:01:28. Version ac04

Copyright 2018 A. Danko


MacKay Tourist Park Clear Sky Chart |Charts Home