Warm Springs Ranch
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Warm Springs Ranch clear sky chart from 2005-11-06 to 2024-03-08.

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
34%
24736
28%
79932
10%
24625
51%
24625
32%
39818

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
22%
940
30%
4327
8%
926
45%
926
21%
1984
January11th to 20thNight
18%
825
33%
4074
9%
805
46%
805
21%
1552
January21st to endNight
15%
832
23%
4287
7%
814
48%
814
20%
1970
February1st to 10thNight
13%
760
30%
2470
5%
760
43%
760
27%
1142
February11th to 20thNight
17%
744
30%
2285
4%
740
45%
740
27%
1109
February21st to endNight
13%
628
34%
1884
4%
628
43%
628
31%
917
March1st to 10thNight
22%
750
30%
2200
6%
750
44%
750
34%
1083
March11th to 20thNight
28%
720
28%
1980
9%
720
43%
720
37%
1058
March21st to endNight
19%
702
28%
2088
4%
702
42%
702
31%
1090
April1st to 10thNight
21%
540
28%
1800
5%
540
49%
540
33%
820
April11th to 20thNight
26%
533
25%
1777
10%
533
45%
533
25%
945
April21st to endNight
28%
540
25%
1800
9%
540
49%
540
28%
957
May1st to 10thNight
28%
540
21%
1727
8%
540
45%
540
29%
949
May11th to 20thNight
43%
531
17%
1418
9%
531
50%
531
30%
883
May21st to endNight
44%
584
20%
1552
9%
582
54%
582
35%
899
June1st to 10thNight
51%
540
25%
1440
14%
540
59%
540
46%
756
June11th to 20thNight
47%
540
26%
1440
16%
540
55%
540
49%
747
June21st to endNight
62%
540
26%
1440
19%
540
68%
540
52%
746
July1st to 10thNight
66%
525
18%
1400
16%
525
68%
525
32%
870
July11th to 20thNight
73%
522
24%
1392
20%
522
75%
522
41%
797
July21st to endNight
67%
591
13%
1633
12%
558
68%
558
27%
1032
August1st to 10thNight
64%
537
14%
1602
11%
534
67%
534
29%
964
August11th to 20thNight
64%
534
24%
1738
21%
534
70%
534
34%
971
August21st to endNight
62%
594
24%
1980
21%
594
69%
594
32%
1126
September1st to 10thNight
63%
540
28%
1800
21%
540
74%
540
35%
959
September11th to 20thNight
57%
540
33%
1800
25%
540
68%
540
43%
884
September21st to endNight
51%
590
31%
2007
18%
590
66%
590
40%
992
October1st to 10thNight
40%
720
29%
2160
11%
720
55%
720
38%
1149
October11th to 20thNight
35%
720
38%
2160
12%
720
55%
720
49%
926
October21st to endNight
30%
792
36%
2376
11%
792
52%
792
39%
1171
November1st to 10thNight
28%
900
35%
2380
9%
900
47%
900
48%
1135
November11th to 20thNight
23%
950
38%
2470
9%
950
44%
950
45%
1139
November21st to endNight
27%
950
32%
2603
8%
950
46%
950
38%
1301
December1st to 10thNight
18%
950
30%
2660
5%
950
40%
950
34%
1266
December11th to 20thNight
18%
949
28%
3111
6%
949
39%
949
27%
1498
December21st to endNight
16%
1043
18%
4671
4%
1026
37%
1026
18%
2031

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
35%25%5%35%5%6%8%52%
78658
Night
242442345%8%63%
80962
TransparencyDay
27%9%13%23%20%7%
78370
Night
20%7%15%28%22%7%
80772
SeeingDay
11%28%28%21%10%2
14505
Night
5%23%33%25%12%2
24753

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 10thDay
32432346%10%63%
2538
11th to 20thDay
1135%35%6%6%10%59%
2772
21st to endDay
437%5%35%5%7%7%55%
3146
February1st to 10thDay
325%5%245%6%9%58%
1710
11th to 20thDay
213425%6%5%8%62%
1782
21st to endDay
226%6%45%5%5%7%58%
1570
March1st to 10thDay
435%5%35%5%6%7%57%
1915
11th to 20thDay
16%36%435%46%8%53%
1980
21st to endDay
1445%5%35%6%8%10%49%
2267
April1st to 10thDay
1425%5%35%5%6%9%55%
2160
11th to 20thDay
28%37%7%46%5%6%8%44%
2131
21st to endDay
37%35%5%45%6%6%10%46%
2160
May1st to 10thDay
47%36%6%46%6%7%8%42%
2226
11th to 20thDay
7%8%46%6%46%6%7%7%39%
2478
21st to endDay
6%6%36%6%47%7%7%8%42%
2724
June1st to 10thDay
3425%6%45%5%7%10%48%
2520
11th to 20thDay
44245%46%5%6%7%54%
2520
21st to endDay
3425%5%37%6%6%8%49%
2520
July1st to 10thDay
7%5%37%7%46%6%7%6%42%
2520
11th to 20thDay
7%6%346%47%5%7%9%41%
2520
21st to endDay
10%7%48%6%5%7%7%7%8%31%
2584
August1st to 10thDay
10%8%38%7%5%6%6%6%8%33%
2328
11th to 20thDay
6%437%6%46%6%5%7%44%
2162
21st to endDay
6%6%36%5%5%6%7%6%8%41%
2376
September1st to 10thDay
5%6%35%6%35%46%6%51%
2160
11th to 20thDay
5%4245%3445%7%55%
2160
21st to endDay
44245%335%45%62%
1948
October1st to 10thDay
45%245%345%6%6%57%
1800
11th to 20thDay
231232345%7%69%
1800
21st to endDay
2424423437%64%
1980
November1st to 10thDay
313223347%73%
1678
11th to 20thDay
212213247%75%
1710
21st to endDay
1323313448%67%
1573
December1st to 10thDay
22442446%8%65%
1520
11th to 20thDay
12134345%5%10%61%
1926
21st to endDay
326%43447%9%59%
2794
January1st to 10thNight
226%5%3445%8%62%
4417
11th to 20thNight
1123245%5%7%69%
4227
21st to endNight
6%35%423446%64%
4521
February1st to 10thNight
225%323447%67%
2470
11th to 20thNight
22432246%7%68%
2284
21st to endNight
32442335%7%67%
1884
March1st to 10thNight
41322345%8%67%
2200
11th to 20thNight
143432335%8%64%
1980
21st to endNight
15%34433347%62%
2088
April1st to 10thNight
131222446%8%68%
1800
11th to 20thNight
37%344235%5%6%57%
1777
21st to endNight
47%34423447%59%
1800
May1st to 10thNight
5%7%3433346%8%55%
1727
11th to 20thNight
6%10%24435%46%8%49%
1417
21st to endNight
5%5%2443346%8%56%
1552
June1st to 10thNight
242331345%10%62%
1440
11th to 20thNight
421232336%8%66%
1440
21st to endNight
3213425%46%9%62%
1440
July1st to 10thNight
7%5%245%25%6%7%10%48%
1440
11th to 20thNight
23245%35%5%6%8%57%
1440
21st to endNight
5%5%25%6%36%6%8%11%43%
1729
August1st to 10thNight
6%5%245%345%7%11%48%
1611
11th to 20thNight
6%5%245%35%5%6%7%53%
1738
21st to endNight
4415%5%346%6%9%51%
1980
September1st to 10thNight
5%3243345%7%8%56%
1800
11th to 20thNight
5%32442335%7%62%
1800
21st to endNight
5%32342335%6%64%
2007
October1st to 10thNight
5%42232345%7%63%
2160
11th to 20thNight
1212312345%77%
2160
21st to endNight
2423322347%67%
2376
November1st to 10thNight
212212346%75%
2380
11th to 20thNight
112212347%77%
2470
21st to endNight
142321335%8%68%
2603
December1st to 10thNight
113423348%72%
2660
11th to 20thNight
31332346%11%62%
3271
21st to endNight
325%4345%5%8%62%
4873

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
16%8%20%27%21%7%
2539
11th to 20thDay
16%10%22%33%16%4
2772
21st to endDay
24%10%12%30%17%6%
3146
February1st to 10thDay
22%9%17%27%17%7%
1710
11th to 20thDay
19%8%13%27%24%8%
1791
21st to endDay
23%9%11%21%24%11%
1570
March1st to 10thDay
25%8%12%26%26%3
1915
11th to 20thDay
27%7%17%27%17%5%
1980
21st to endDay
27%10%15%27%17%4
2267
April1st to 10thDay
25%9%15%24%18%9%
2160
11th to 20thDay
35%9%14%21%18%3
2134
21st to endDay
32%10%13%29%15%2
2160
May1st to 10thDay
37%9%12%23%16%3
2226
11th to 20thDay
39%12%15%22%10%1
2482
21st to endDay
35%11%13%20%16%5%
2724
June1st to 10thDay
29%10%14%19%21%7%
2520
11th to 20thDay
27%7%9%18%22%16%
2520
21st to endDay
28%9%10%20%21%12%
2520
July1st to 10thDay
37%11%11%15%16%10%
2451
11th to 20thDay
35%13%13%19%13%7%
2445
21st to endDay
45%14%16%13%9%3
2440
August1st to 10thDay
45%13%12%12%13%5%
2313
11th to 20thDay
36%10%12%17%18%7%
2162
21st to endDay
35%13%11%19%18%4
2376
September1st to 10thDay
31%9%10%14%23%13%
2160
11th to 20thDay
26%7%12%19%25%10%
2160
21st to endDay
24%7%7%25%30%7%
1948
October1st to 10thDay
25%9%10%20%27%9%
1800
11th to 20thDay
16%48%26%35%11%
1800
21st to endDay
21%6%10%30%24%9%
1980
November1st to 10thDay
12%5%14%23%35%10%
1678
11th to 20thDay
12%413%36%26%10%
1710
21st to endDay
18%5%12%29%23%13%
1573
December1st to 10thDay
16%8%19%31%19%6%
1520
11th to 20thDay
18%8%16%31%23%3
1924
21st to endDay
18%8%14%26%24%10%
2794
January1st to 10thNight
21%6%15%33%20%4
4417
11th to 20thNight
12%10%19%36%18%6%
4227
21st to endNight
22%7%14%30%22%5%
4521
February1st to 10thNight
18%417%33%21%7%
2470
11th to 20thNight
16%6%15%30%25%6%
2285
21st to endNight
18%5%12%30%26%10%
1884
March1st to 10thNight
16%6%13%31%29%4
2200
11th to 20thNight
21%6%13%35%20%5%
1980
21st to endNight
22%5%17%32%20%3
2088
April1st to 10thNight
15%7%17%31%23%6%
1800
11th to 20thNight
27%6%12%31%20%3
1777
21st to endNight
26%7%15%33%17%2
1800
May1st to 10thNight
28%7%15%29%18%2
1727
11th to 20thNight
32%9%19%27%12%1
1418
21st to endNight
26%8%16%23%21%6%
1552
June1st to 10thNight
18%7%19%28%19%9%
1440
11th to 20thNight
16%7%14%21%25%16%
1440
21st to endNight
17%7%14%24%26%12%
1440
July1st to 10thNight
30%12%14%20%15%9%
1400
11th to 20thNight
23%10%18%24%18%7%
1392
21st to endNight
31%15%26%20%7%2
1633
August1st to 10thNight
28%14%21%18%13%5%
1602
11th to 20thNight
28%9%17%20%21%6%
1738
21st to endNight
26%12%15%25%17%5%
1980
September1st to 10thNight
24%9%13%21%22%10%
1800
11th to 20thNight
21%6%15%23%23%12%
1800
21st to endNight
22%6%9%29%29%6%
2007
October1st to 10thNight
21%8%12%24%25%11%
2160
11th to 20thNight
11%311%28%35%12%
2160
21st to endNight
18%5%12%29%29%7%
2376
November1st to 10thNight
12%414%28%32%11%
2380
11th to 20thNight
9%414%36%28%9%
2470
21st to endNight
16%5%12%31%26%10%
2603
December1st to 10thNight
14%5%20%31%24%7%
2660
11th to 20thNight
17%7%18%26%27%6%
3272
21st to endNight
20%7%15%25%21%12%
4873

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
11%37%25%20%6%1
270
11th to 20thDay
13%44%24%14%4
270
21st to endDay
5%45%33%14%31
297
February1st to 10thDay
9%62%20%8%1
270
11th to 20thDay
15%49%26%8%3
270
21st to endDay
23%44%24%8%
225
March1st to 10thDay
11%48%25%14%2
306
11th to 20thDay
10%41%31%15%3
420
21st to endDay
11%53%26%9%1
462
April1st to 10thDay
13%45%30%9%3
420
11th to 20thDay
19%46%23%9%3
412
21st to endDay
18%41%27%10%31
420
May1st to 10thDay
14%39%28%13%5%1
449
11th to 20thDay
14%24%28%22%9%3
625
21st to endDay
11%23%28%25%11%2
679
June1st to 10thDay
5%19%27%27%19%3
630
11th to 20thDay
7%20%31%28%11%3
630
21st to endDay
5%16%32%23%19%4
630
July1st to 10thDay
7%8%25%34%21%5%
621
11th to 20thDay
9%6%22%34%22%7%
618
21st to endDay
13%9%24%32%19%4
526
August1st to 10thDay
14%10%30%27%16%3
447
11th to 20thDay
8%9%31%31%18%4
437
21st to endDay
12%12%26%31%17%3
495
September1st to 10thDay
11%12%33%24%15%4
450
11th to 20thDay
6%19%34%25%13%2
450
21st to endDay
9%20%25%26%17%4
292
October1st to 10thDay
8%27%21%22%20%3
270
11th to 20thDay
12%34%25%21%7%1
270
21st to endDay
12%32%29%19%7%1
297
November1st to 10thDay
11%42%26%14%7%
270
11th to 20thDay
11%37%33%13%42
270
21st to endDay
5%36%39%16%31
270
December1st to 10thDay
16%39%28%12%5%1
270
11th to 20thDay
10%49%27%9%4
270
21st to endDay
16%43%26%11%41
297
January1st to 10thNight
6%36%33%19%6%1
950
11th to 20thNight
6%41%30%16%6%1
825
21st to endNight
335%43%14%5%1
836
February1st to 10thNight
340%39%13%4
760
11th to 20thNight
439%36%17%4
744
21st to endNight
5%33%44%15%2
628
March1st to 10thNight
331%39%22%4
750
11th to 20thNight
325%41%23%8%
720
21st to endNight
330%43%18%4
702
April1st to 10thNight
6%25%46%19%4
540
11th to 20thNight
8%27%34%23%7%1
533
21st to endNight
8%25%34%24%8%1
540
May1st to 10thNight
8%16%43%23%10%1
540
11th to 20thNight
11%11%28%34%14%2
531
21st to endNight
9%13%30%30%15%2
584
June1st to 10thNight
5%8%29%35%22%2
540
11th to 20thNight
6%9%34%38%13%1
540
21st to endNight
3427%36%28%3
540
July1st to 10thNight
9%214%36%35%5%
525
11th to 20thNight
4211%41%36%6%
522
21st to endNight
7%311%33%42%4
591
August1st to 10thNight
9%313%35%36%3
537
11th to 20thNight
7%317%40%28%5%
534
21st to endNight
6%220%33%35%5%
594
September1st to 10thNight
6%321%40%24%6%
540
11th to 20thNight
8%326%40%21%3
540
21st to endNight
6%10%29%32%20%3
590
October1st to 10thNight
6%13%36%29%12%3
720
11th to 20thNight
223%36%25%12%2
720
21st to endNight
5%24%37%22%10%2
792
November1st to 10thNight
424%41%22%8%1
900
11th to 20thNight
333%39%18%6%1
950
21st to endNight
430%36%25%5%
950
December1st to 10thNight
5%35%38%17%4
950
11th to 20thNight
5%37%35%17%6%
950
21st to endNight
7%37%35%16%41
1045
Page generated at 2024-03-05 05:24:05. Version ac07

Copyright © 2024 Attilla Danko.


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