Temple Terrace
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Temple Terrace clear sky chart from 2005-11-05 to 2017-12-04.

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
58%
16192
22%
47882
17%
16151
64%
16151
32%
29320

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
45%
718
20%
2327
16%
716
54%
716
25%
1432
January16th to endNight
44%
768
25%
2400
19%
768
53%
768
28%
1466
February1st to 15thNight
45%
701
26%
2103
18%
698
55%
698
34%
1226
February16th to endNight
45%
631
25%
1859
14%
631
55%
631
34%
1089
March1st to 15thNight
46%
720
31%
1980
16%
720
59%
720
41%
1108
March16th to endNight
51%
768
27%
2112
19%
768
58%
768
41%
1210
April1st to 15thNight
54%
718
24%
1976
17%
718
60%
718
44%
1088
April16th to endNight
55%
711
27%
1871
17%
711
62%
711
42%
1089
May1st to 15thNight
72%
539
28%
1619
22%
539
76%
539
46%
846
May16th to endNight
75%
561
25%
1683
20%
561
78%
561
40%
972
June1st to 15thNight
69%
540
13%
1620
11%
540
70%
540
26%
1092
June16th to endNight
75%
540
9%
1620
7%
540
76%
540
26%
1104
July1st to 15thNight
77%
510
6%
1530
5%
510
77%
510
23%
1104
July16th to endNight
75%
564
7%
1595
7%
531
76%
531
22%
1124
August1st to 15thNight
76%
539
5%
1666
6%
536
76%
536
26%
1126
August16th to endNight
67%
695
9%
2032
10%
695
67%
695
22%
1434
September1st to 15thNight
64%
720
8%
1980
7%
720
65%
720
21%
1448
September16th to endNight
64%
717
16%
1980
15%
717
65%
717
25%
1379
October1st to 15thNight
66%
720
25%
2016
23%
720
70%
720
34%
1225
October16th to endNight
54%
768
30%
2304
25%
768
62%
768
35%
1331
November1st to 15thNight
59%
760
32%
2281
25%
760
69%
760
43%
1208
November16th to endNight
52%
780
32%
2441
24%
780
64%
780
35%
1381
December1st to 15thNight
49%
736
27%
2391
22%
736
59%
736
31%
1398
December16th to endNight
53%
768
25%
2496
23%
768
59%
768
30%
1440

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
8%5%26%6%46%6%6%8%37%
48594
Night
7%425%5%35%5%6%9%44%
48090
TransparencyDay
41%5%14%18%14%5%
48295
Night
35%5%16%20%15%5%
47893
SeeingDay
9%313%23%25%25%
6040
Night
8%318%32%26%9%
16200

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 15thDay
10%6%25%5%245%6%10%39%
1611
16th to endDay
10%4244345%5%6%47%
1822
February1st to 15thDay
12%5%24424448%46%
1750
16th to endDay
7%5%25%43445%7%50%
1613
March1st to 15thDay
5%3144346%5%8%52%
1980
16th to endDay
8%425%5%3445%8%48%
2111
April1st to 15thDay
7%325%436%5%5%9%46%
1972
16th to endDay
5%4245%36%5%5%8%47%
2097
May1st to 15thDay
5%3144345%6%9%50%
2331
16th to endDay
6%426%8%48%7%6%8%35%
2431
June1st to 15thDay
12%6%27%7%5%7%7%8%9%24%
2340
16th to endDay
8%5%38%8%5%7%7%8%11%22%
2340
July1st to 15thDay
9%6%37%9%6%9%10%8%8%20%
2340
16th to endDay
8%6%38%9%6%8%8%8%10%20%
2465
August1st to 15thDay
7%5%38%9%6%9%9%9%9%21%
2278
16th to endDay
10%6%38%9%6%8%6%8%10%21%
2157
September1st to 15thDay
9%6%47%9%5%8%8%8%10%22%
1980
16th to endDay
10%6%37%8%5%8%6%8%9%24%
1980
October1st to 15thDay
6%5%36%8%47%6%7%7%37%
1944
16th to endDay
9%5%25%5%2345%7%48%
1920
November1st to 15thDay
7%32442445%9%51%
1907
16th to endDay
8%4245%3445%7%47%
1846
December1st to 15thDay
8%5%25%5%35%5%6%7%42%
1651
16th to endDay
7%425%425%6%5%9%46%
1728
January1st to 15thNight
9%5%37%5%245%5%8%41%
2327
16th to endNight
12%5%25%425%5%5%7%43%
2400
February1st to 15thNight
11%5%2432445%6%50%
2103
16th to endNight
7%5%35%434438%49%
1859
March1st to 15thNight
5%32443345%7%54%
1980
16th to endNight
6%41433445%7%54%
2112
April1st to 15thNight
5%2134245%5%10%53%
1976
16th to endNight
6%32442445%7%54%
1871
May1st to 15thNight
4313315%46%8%57%
1619
16th to endNight
5%214435%5%6%8%52%
1682
June1st to 15thNight
10%5%35%5%36%6%6%11%35%
1620
16th to endNight
6%426%6%47%6%9%13%33%
1620
July1st to 15thNight
6%5%25%5%48%8%10%13%31%
1620
16th to endNight
5%5%26%7%5%7%9%9%11%29%
1703
August1st to 15thNight
4426%7%46%7%9%12%34%
1677
16th to endNight
7%6%27%6%36%6%8%13%32%
2032
September1st to 15thNight
7%5%27%7%47%7%8%11%28%
1980
16th to endNight
8%6%47%7%36%6%7%10%32%
1980
October1st to 15thNight
6%4245%35%5%6%8%47%
2016
16th to endNight
9%5%25%42335%7%50%
2304
November1st to 15thNight
5%324424447%57%
2281
16th to endNight
6%425%4345%6%6%50%
2441
December1st to 15thNight
9%5%245%34447%47%
2391
16th to endNight
7%425%435%5%6%8%45%
2496

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
39%39%22%19%5%
1612
16th to endDay
35%37%18%25%8%
1822
February1st to 15thDay
36%37%17%22%14%
1752
16th to endDay
32%311%16%23%11%
1613
March1st to 15thDay
28%310%26%22%8%
1980
16th to endDay
33%39%21%21%9%
2112
April1st to 15thDay
32%412%20%21%8%
1972
16th to endDay
32%49%21%24%7%
2097
May1st to 15thDay
28%411%25%20%8%
2331
16th to endDay
42%5%12%20%16%2
2435
June1st to 15thDay
52%6%18%18%4
2340
16th to endDay
51%8%23%13%2
2340
July1st to 15thDay
55%10%23%8%1
2201
16th to endDay
52%10%24%11%1
2310
August1st to 15thDay
52%9%28%9%
2265
16th to endDay
55%9%22%12%
2157
September1st to 15thDay
52%9%22%12%2
1980
16th to endDay
50%5%16%17%7%1
1980
October1st to 15thDay
42%5%8%17%15%9%
1944
16th to endDay
35%37%18%21%14%
1920
November1st to 15thDay
30%37%25%24%9%
1907
16th to endDay
33%47%22%19%12%
1846
December1st to 15thDay
38%310%23%17%6%
1651
16th to endDay
34%412%20%21%7%
1728
January1st to 15thNight
40%310%22%17%5%
2327
16th to endNight
39%39%19%20%9%
2400
February1st to 15thNight
34%27%19%23%13%
2112
16th to endNight
33%313%17%23%7%
1859
March1st to 15thNight
28%311%29%20%7%
1980
16th to endNight
28%311%26%20%8%
2112
April1st to 15thNight
25%416%24%22%6%
1976
16th to endNight
29%311%24%23%6%
1871
May1st to 15thNight
22%414%29%20%7%
1620
16th to endNight
28%6%18%25%19%2
1684
June1st to 15thNight
41%7%22%20%6%
1620
16th to endNight
39%10%27%17%4
1620
July1st to 15thNight
40%14%33%9%1
1530
16th to endNight
41%12%31%12%1
1595
August1st to 15thNight
36%12%38%11%
1666
16th to endNight
42%11%28%15%1
2032
September1st to 15thNight
45%11%26%13%3
1980
16th to endNight
44%7%19%20%5%2
1980
October1st to 15thNight
33%6%12%20%20%7%
2016
16th to endNight
33%28%18%25%11%
2304
November1st to 15thNight
27%29%25%25%9%
2281
16th to endNight
32%38%22%20%11%
2441
December1st to 15thNight
36%311%26%17%5%
2391
16th to endNight
35%412%22%18%7%
2496

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
14%11%32%26%15%
90
16th to endDay
17%12%33%25%9%2
96
February1st to 15thDay
15%13%22%28%16%3
90
16th to endDay
9%7%42%29%10%
114
March1st to 15thDay
5%7%34%33%16%2
270
16th to endDay
10%7%22%29%26%3
288
April1st to 15thDay
7%7%23%30%24%7%
270
16th to endDay
6%218%29%31%12%
270
May1st to 15thDay
6%315%27%30%15%
288
16th to endDay
6%17%21%31%32%
331
June1st to 15thDay
17%1413%27%36%
315
16th to endDay
6%1113%24%52%
315
July1st to 15thDay
4425%64%
305
16th to endDay
11%1210%23%49%
326
August1st to 15thDay
9%110%24%53%
313
16th to endDay
12%1210%25%47%
332
September1st to 15thDay
13%3215%27%37%
315
16th to endDay
9%1218%35%31%
314
October1st to 15thDay
6%38%35%33%11%
315
16th to endDay
12%323%30%22%7%
336
November1st to 15thDay
6%217%35%28%9%
325
16th to endDay
7%326%40%18%3
226
December1st to 15thDay
7%7%40%31%11%4
100
16th to endDay
5%5%21%43%20%3
96
January1st to 15thNight
11%8%25%39%14%
720
16th to endNight
14%7%27%36%13%
768
February1st to 15thNight
13%6%30%34%13%1
704
16th to endNight
9%6%29%43%10%
631
March1st to 15thNight
6%6%35%38%12%
720
16th to endNight
7%5%27%41%15%1
768
April1st to 15thNight
5%428%40%19%
718
16th to endNight
8%424%41%20%
711
May1st to 15thNight
6%114%44%30%3
540
16th to endNight
5%11%38%36%6%
563
June1st to 15thNight
11%5%23%43%15%
540
16th to endNight
6%215%41%32%
540
July1st to 15thNight
7%17%44%38%
510
16th to endNight
6%116%44%40%
564
August1st to 15thNight
419%46%38%
539
16th to endNight
10%2314%37%31%
695
September1st to 15thNight
11%2421%40%20%
720
16th to endNight
10%1431%39%12%
717
October1st to 15thNight
7%212%42%29%5%
720
16th to endNight
10%322%34%27%2
768
November1st to 15thNight
6%224%41%22%2
760
16th to endNight
8%328%41%17%1
780
December1st to 15thNight
10%427%36%20%
736
16th to endNight
8%424%39%20%1
768
Page generated at 2017-12-05 10:19:03. Version ac04

Copyright 2017 A. Danko


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