Waid Observatory (Waurika)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Waid Observatory (Waurika) clear sky chart from 2005-11-05 to 2017-10-31.

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
51%
15816
30%
47438
20%
15773
61%
15773
42%
25203

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
42%
898
32%
2327
14%
895
53%
895
44%
1298
January16th to endNight
44%
960
36%
2496
16%
960
55%
960
46%
1392
February1st to 15thNight
38%
730
28%
2139
13%
727
50%
727
37%
1186
February16th to endNight
31%
632
33%
1894
12%
632
48%
632
38%
1016
March1st to 15thNight
35%
579
29%
2019
18%
579
48%
579
29%
1119
March16th to endNight
33%
576
25%
2112
16%
576
47%
576
32%
1112
April1st to 15thNight
30%
539
24%
1971
13%
539
48%
539
32%
1009
April16th to endNight
36%
540
29%
1649
17%
540
53%
540
39%
892
May1st to 15thNight
38%
540
25%
1620
15%
540
54%
540
37%
911
May16th to endNight
53%
562
28%
1684
24%
561
65%
561
42%
908
June1st to 15thNight
60%
540
23%
1620
19%
540
69%
540
49%
808
June16th to endNight
70%
540
27%
1620
27%
540
75%
540
49%
813
July1st to 15thNight
73%
510
21%
1530
22%
510
76%
510
43%
815
July16th to endNight
88%
564
33%
1594
40%
531
88%
531
57%
745
August1st to 15thNight
86%
539
34%
1610
39%
536
86%
536
51%
787
August16th to endNight
82%
573
30%
1884
35%
573
83%
573
46%
918
September1st to 15thNight
66%
540
25%
1980
26%
540
71%
540
32%
1067
September16th to endNight
68%
537
35%
1980
33%
537
75%
537
38%
972
October1st to 15thNight
56%
584
34%
2024
29%
584
63%
584
41%
995
October16th to endNight
54%
768
38%
2304
22%
768
65%
768
51%
1128
November1st to 15thNight
50%
805
32%
2205
15%
805
60%
805
50%
1153
November16th to endNight
42%
900
35%
2340
16%
900
53%
900
44%
1323
December1st to 15thNight
43%
900
33%
2340
15%
900
54%
900
44%
1325
December16th to endNight
37%
960
31%
2496
14%
960
49%
960
38%
1511

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%313323446%55%
48311
Night
8%313323347%59%
47634
Cloud CoverDay
8%313323346%55%
48309
Night
8%313313346%59%
47634
TransparencyDay
28%410%24%24%7%
48009
Night
25%49%23%26%11%
47439
SeeingDay
8%421%31%26%8%
5785
Night
9%6%29%37%16%1
15820

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
10%414312245%58%
1611
16th to endDay
9%324223345%58%
1728
February1st to 15thDay
9%6%23212335%57%
1732
16th to endDay
13%5%2321223457%
1580
March1st to 15thDay
13%423323446%49%
1941
16th to endDay
13%5%24414335%51%
2112
April1st to 15thDay
10%323313346%57%
1975
16th to endDay
10%32341435%5%54%
2310
May1st to 15thDay
11%6%34423345%50%
2331
16th to endDay
9%4244245%5%8%46%
2430
June1st to 15thDay
6%313325%46%8%53%
2340
16th to endDay
421333345%8%58%
2340
July1st to 15thDay
7%314436%5%6%10%45%
2340
16th to endDay
311242446%9%57%
2466
August1st to 15thDay
2213425%5%7%8%56%
2340
16th to endDay
4313425%6%7%9%51%
2315
September1st to 15thDay
11%3136%34446%49%
1980
16th to endDay
7%3144235%47%55%
1980
October1st to 15thDay
9%313222346%60%
1923
16th to endDay
6%21331223469%
1919
November1st to 15thDay
6%313212245%66%
1650
16th to endDay
9%212223225%63%
1620
December1st to 15thDay
12%423424336%53%
1620
16th to endDay
14%5%24312235%53%
1728
January1st to 15thNight
9%412322345%60%
2327
16th to endNight
8%32231234463%
2496
February1st to 15thNight
11%423213235%58%
2129
16th to endNight
11%313212335%60%
1894
March1st to 15thNight
12%32331444454%
2019
16th to endNight
9%414413337%55%
2112
April1st to 15thNight
9%323324447%55%
1971
16th to endNight
9%31341225%7%56%
1649
May1st to 15thNight
10%323213447%54%
1619
16th to endNight
6%2133145%5%8%56%
1683
June1st to 15thNight
32321446%10%60%
1620
16th to endNight
4212324338%63%
1620
July1st to 15thNight
43133245%7%9%54%
1620
16th to endNight
11221345%9%65%
1702
August1st to 15thNight
211332437%11%59%
1620
16th to endNight
22133245%8%10%55%
1884
September1st to 15thNight
9%324424447%52%
1980
16th to endNight
7%31432345%7%57%
1980
October1st to 15thNight
8%313222346%61%
2024
16th to endNight
6%21221222370%
2304
November1st to 15thNight
5%213222245%66%
2205
16th to endNight
10%31321323462%
2340
December1st to 15thNight
12%312212237%59%
2340
16th to endNight
12%5%24322336%53%
2496

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
9%413312345%59%
1611
16th to endDay
9%313323345%58%
1728
February1st to 15thDay
9%6%24212345%57%
1732
16th to endDay
13%5%2321223458%
1580
March1st to 15thDay
14%423423346%49%
1941
16th to endDay
12%5%25%313345%51%
2110
April1st to 15thDay
11%313313346%57%
1975
16th to endDay
10%32442345%6%54%
2310
May1st to 15thDay
11%6%24424346%50%
2331
16th to endDay
9%4245%25%5%5%8%46%
2430
June1st to 15thDay
6%413325%5%6%8%52%
2340
16th to endDay
421333445%7%58%
2340
July1st to 15thDay
7%314445%46%10%46%
2340
16th to endDay
311333445%9%58%
2466
August1st to 15thDay
211342446%9%57%
2340
16th to endDay
4213425%6%6%9%52%
2315
September1st to 15thDay
10%4145%34447%50%
1980
16th to endDay
8%314324447%55%
1980
October1st to 15thDay
9%313322346%60%
1923
16th to endDay
6%11231233469%
1919
November1st to 15thDay
6%31321234466%
1650
16th to endDay
9%212313335%63%
1620
December1st to 15thDay
11%423423236%53%
1620
16th to endDay
14%5%24212235%53%
1728
January1st to 15thNight
9%41221225%6%60%
2327
16th to endNight
8%32231234462%
2496
February1st to 15thNight
10%5%12313235%58%
2129
16th to endNight
11%313213335%60%
1894
March1st to 15thNight
12%313413435%54%
2019
16th to endNight
9%5%14323346%55%
2112
April1st to 15thNight
8%31242445%7%55%
1971
16th to endNight
9%323422347%56%
1649
May1st to 15thNight
10%32321445%7%55%
1619
16th to endNight
6%3133145%5%8%57%
1683
June1st to 15thNight
421221446%10%59%
1620
16th to endNight
4222323339%62%
1620
July1st to 15thNight
42133245%6%10%54%
1620
16th to endNight
11221345%9%65%
1702
August1st to 15thNight
211322346%10%59%
1620
16th to endNight
32132245%7%10%55%
1884
September1st to 15thNight
9%32442435%6%52%
1980
16th to endNight
7%21342335%7%57%
1980
October1st to 15thNight
8%31331235%5%61%
2024
16th to endNight
6%21221222470%
2304
November1st to 15thNight
5%213212335%66%
2205
16th to endNight
10%31321323462%
2340
December1st to 15thNight
12%312212237%59%
2340
16th to endNight
11%5%24323336%53%
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
28%28%22%29%8%
1612
16th to endDay
28%25%23%32%7%
1728
February1st to 15thDay
29%36%24%27%8%
1733
16th to endDay
31%35%20%28%10%
1580
March1st to 15thDay
35%48%21%20%10%
1941
16th to endDay
35%48%24%20%6%
2112
April1st to 15thDay
28%49%25%19%12%
1975
16th to endDay
30%5%9%21%24%8%
2310
May1st to 15thDay
36%5%9%18%23%7%
2331
16th to endDay
34%7%13%23%18%3
2434
June1st to 15thDay
27%6%14%24%23%4
2340
16th to endDay
24%5%13%26%24%6%
2340
July1st to 15thDay
30%6%15%26%18%2
2201
16th to endDay
20%5%15%29%27%2
2311
August1st to 15thDay
21%7%13%27%23%6%
2326
16th to endDay
25%7%13%29%19%5%
2315
September1st to 15thDay
34%5%9%21%20%8%
1980
16th to endDay
28%48%24%23%9%
1980
October1st to 15thDay
26%39%24%24%11%
1923
16th to endDay
19%37%23%32%14%
1919
November1st to 15thDay
20%310%26%28%11%
1650
16th to endDay
25%3421%32%13%
1620
December1st to 15thDay
33%37%26%25%4
1620
16th to endDay
34%27%23%25%7%
1728
January1st to 15thNight
25%26%20%32%12%
2327
16th to endNight
24%36%19%32%13%
2496
February1st to 15thNight
29%36%21%25%12%
2139
16th to endNight
26%36%23%25%13%
1894
March1st to 15thNight
32%46%18%23%14%
2019
16th to endNight
29%411%24%21%7%
2112
April1st to 15thNight
28%411%19%21%15%
1971
16th to endNight
27%311%23%23%11%
1649
May1st to 15thNight
27%6%13%17%23%11%
1620
16th to endNight
24%6%13%27%23%4
1685
June1st to 15thNight
19%5%14%33%21%6%
1620
16th to endNight
21%410%25%28%9%
1620
July1st to 15thNight
22%7%12%29%23%4
1530
16th to endNight
15%413%29%32%4
1594
August1st to 15thNight
18%412%26%26%11%
1610
16th to endNight
19%6%14%25%26%7%
1884
September1st to 15thNight
31%5%9%20%22%10%
1980
16th to endNight
25%48%21%27%12%
1980
October1st to 15thNight
24%410%22%22%15%
2024
16th to endNight
19%2419%33%19%
2304
November1st to 15thNight
21%26%22%29%16%
2205
16th to endNight
26%2419%30%15%
2340
December1st to 15thNight
27%27%26%26%9%
2340
16th to endNight
32%26%21%27%9%
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
21%11%27%31%6%2
90
16th to endDay
6%8%43%28%11%2
96
February1st to 15thDay
7%8%44%33%5%
90
16th to endDay
6%451%28%6%2
81
March1st to 15thDay
20%16%31%26%41
90
16th to endDay
6%11%40%31%7%3
96
April1st to 15thDay
20%11%24%32%10%
94
16th to endDay
11%13%36%28%8%1
420
May1st to 15thDay
11%9%36%29%10%2
468
16th to endDay
12%5%33%27%18%3
517
June1st to 15thDay
7%118%39%26%6%
495
16th to endDay
6%213%35%30%10%
495
July1st to 15thDay
5%110%34%38%8%
475
16th to endDay
2324%48%19%
515
August1st to 15thDay
5%431%47%11%
493
16th to endDay
6%17%36%35%13%
355
September1st to 15thDay
2422%46%22%
135
16th to endDay
15%5%29%33%15%
135
October1st to 15thDay
5%220%31%26%12%
135
16th to endDay
7%425%34%23%3
144
November1st to 15thDay
16%320%36%16%6%
90
16th to endDay
20%16%37%14%8%2
90
December1st to 15thDay
10%350%21%11%4
90
16th to endDay
11%10%44%26%7%
96
January1st to 15thNight
11%9%33%35%9%
900
16th to endNight
9%7%34%39%7%
960
February1st to 15thNight
12%9%35%35%6%
731
16th to endNight
12%10%42%30%2
632
March1st to 15thNight
13%10%36%34%3
579
16th to endNight
10%10%43%28%6%
576
April1st to 15thNight
10%11%45%28%4
539
16th to endNight
11%7%41%30%7%
540
May1st to 15thNight
10%9%39%29%8%2
540
16th to endNight
6%333%36%18%2
563
June1st to 15thNight
5%129%41%21%
540
16th to endNight
4116%51%24%2
540
July1st to 15thNight
412%46%34%
510
16th to endNight
2443%44%4
564
August1st to 15thNight
2346%43%2
539
16th to endNight
36%45%40%3
573
September1st to 15thNight
10%13%38%34%2
540
16th to endNight
9%13%44%28%3
537
October1st to 15thNight
10%226%36%21%1
584
16th to endNight
7%6%29%39%15%1
768
November1st to 15thNight
6%5%33%36%15%1
805
16th to endNight
12%8%34%31%11%
900
December1st to 15thNight
14%7%31%37%8%
900
16th to endNight
14%8%36%32%7%
960
Page generated at 2017-11-01 16:23:30. Version ac04

Copyright 2017 A. Danko


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