Hot Springs
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hot Springs clear sky chart from 2005-11-06 to 2024-11-25.

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
42%
25741
21%
98423
13%
25508
51%
25508
27%
53682

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
32%
938
22%
4332
10%
926
42%
926
20%
2391
January11th to 20thNight
27%
944
21%
4349
8%
930
39%
930
19%
2535
January21st to endNight
27%
1033
14%
4607
6%
1023
38%
1023
23%
2196
February1st to 10thNight
26%
760
17%
2470
7%
760
37%
760
23%
1565
February11th to 20thNight
31%
740
18%
2242
8%
740
41%
740
26%
1404
February21st to endNight
30%
628
20%
1884
6%
628
43%
628
28%
1144
March1st to 10thNight
36%
757
27%
3642
9%
744
47%
744
22%
1872
March11th to 20thNight
43%
743
20%
3665
14%
731
51%
731
23%
1811
March21st to endNight
37%
624
11%
3431
11%
605
48%
605
13%
2183
April1st to 10thNight
36%
570
18%
1900
12%
570
47%
570
25%
1169
April11th to 20thNight
34%
563
19%
1877
13%
563
46%
563
23%
1170
April21st to endNight
40%
570
16%
1778
14%
570
46%
570
25%
1130
May1st to 10thNight
44%
568
17%
2668
14%
559
49%
559
17%
1632
May11th to 20thNight
48%
548
16%
2420
10%
541
51%
541
23%
1190
May21st to endNight
41%
608
12%
2747
9%
593
45%
593
18%
1604
June1st to 10thNight
55%
570
14%
1520
7%
570
57%
570
38%
914
June11th to 20thNight
44%
570
13%
1520
6%
570
47%
570
34%
955
June21st to endNight
60%
570
18%
1520
10%
570
64%
570
48%
840
July1st to 10thNight
63%
545
18%
2218
11%
535
66%
535
29%
1201
July11th to 20thNight
60%
540
20%
2133
14%
533
65%
533
39%
1028
July21st to endNight
66%
608
21%
2193
19%
569
69%
569
38%
1074
August1st to 10thNight
61%
557
20%
2289
18%
545
64%
545
27%
1294
August11th to 20thNight
66%
556
18%
2851
26%
544
73%
544
26%
1502
August21st to endNight
64%
617
25%
3081
29%
605
72%
605
31%
1403
September1st to 10thNight
64%
570
29%
1900
28%
570
71%
570
43%
932
September11th to 20thNight
58%
570
30%
1981
27%
570
67%
570
40%
971
September21st to endNight
54%
570
32%
2090
28%
570
64%
570
37%
1020
October1st to 10thNight
49%
647
45%
3174
20%
640
56%
640
31%
1209
October11th to 20thNight
45%
746
23%
3390
16%
740
55%
740
27%
1602
October21st to endNight
41%
1031
26%
4226
10%
1022
50%
1022
28%
2174
November1st to 10thNight
41%
975
26%
2535
11%
975
49%
975
40%
1529
November11th to 20thNight
38%
1000
29%
2600
12%
1000
49%
1000
40%
1517
November21st to endNight
42%
973
26%
2692
13%
973
52%
973
39%
1556
December1st to 10thNight
29%
950
22%
2660
6%
950
43%
950
34%
1583
December11th to 20thNight
34%
948
22%
3134
10%
948
43%
948
30%
1735
December21st to endNight
28%
1034
15%
4704
5%
1026
42%
1026
19%
2647

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%6%25%34446%7%53%
105393
Night
7%6%26%44446%7%51%
102761
TransparencyDay
29%6%14%27%18%6%
105136
Night
31%6%14%27%17%4
102608
SeeingDay
11%12%31%30%14%2
15939
Night
10%9%34%37%11%1
25933

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
26%26%5%4446%8%52%
2538
11th to 20thDay
38%38%5%5%5%46%8%45%
2540
21st to endDay
36%36%434347%58%
2822
February1st to 10thDay
7%10%5%8%5%5%445%6%41%
1710
11th to 20thDay
6%9%38%5%4445%7%45%
1824
21st to endDay
5%10%36%445%46%6%48%
1570
March1st to 10thDay
5%8%25%34335%7%54%
3130
11th to 20thDay
7%6%2433335%7%56%
3255
21st to endDay
16%9%36%34436%7%38%
4165
April1st to 10thDay
11%11%3433335%8%45%
2280
11th to 20thDay
13%10%36%5%45%45%6%40%
2251
21st to endDay
14%7%35%5%4335%8%42%
2400
May1st to 10thDay
16%7%37%445%46%7%37%
4179
11th to 20thDay
12%6%25%34446%7%46%
4388
21st to endDay
14%6%25%445%46%8%44%
4825
June1st to 10thDay
8%42443447%9%52%
2660
11th to 20thDay
9%41433447%8%52%
2660
21st to endDay
5%31323346%8%62%
2660
July1st to 10thDay
43133445%7%10%57%
4430
11th to 20thDay
3213345%5%8%10%57%
4430
21st to endDay
3213235%47%9%60%
4802
August1st to 10thDay
7%424445%47%8%52%
4411
11th to 20thDay
6%41434438%9%54%
3808
21st to endDay
431333337%8%62%
4180
September1st to 10thDay
6%313333347%64%
2280
11th to 20thDay
8%31332225%6%64%
2199
21st to endDay
10%413322235%64%
2090
October1st to 10thDay
7%41212223473%
3325
11th to 20thDay
9%5%23232246%63%
3105
21st to endDay
9%6%25%44445%7%51%
3091
November1st to 10thDay
6%7%2433445%9%52%
1763
11th to 20thDay
37%2434436%6%57%
1800
21st to endDay
5%7%25%33435%7%54%
1582
December1st to 10thDay
48%2435%5%5%6%7%51%
1520
11th to 20thDay
35%26%345%35%6%57%
1926
21st to endDay
7%11%37%5%4335%5%49%
2794
January1st to 10thNight
38%310%5%45%445%49%
4417
11th to 20thNight
26%411%6%6%5%45%6%45%
4430
21st to endNight
35%26%44445%7%55%
4873
February1st to 10thNight
6%10%48%45%4447%42%
2470
11th to 20thNight
410%38%45%446%6%45%
2242
21st to endNight
6%9%37%44435%6%48%
1884
March1st to 10thNight
6%7%37%44436%7%49%
3734
11th to 20thNight
6%6%25%445%46%9%50%
3699
21st to endNight
13%9%37%5%4446%9%35%
3477
April1st to 10thNight
13%8%2444437%7%44%
1900
11th to 20thNight
13%8%36%44435%6%44%
1877
21st to endNight
13%7%25%5%4436%8%42%
1778
May1st to 10thNight
13%7%37%5%45%46%5%41%
2788
11th to 20thNight
9%425%24445%8%52%
2517
21st to endNight
15%5%25%44446%8%43%
2762
June1st to 10thNight
7%425%435%48%10%48%
1520
11th to 20thNight
11%4144445%6%8%49%
1520
21st to endNight
5%31333437%8%59%
1520
July1st to 10thNight
5%5%26%44445%8%53%
2540
11th to 20thNight
3213345%49%10%57%
2540
21st to endNight
332433447%9%59%
2761
August1st to 10thNight
5%326%46%5%5%7%9%47%
2528
11th to 20thNight
5%5%26%45%447%8%50%
3015
21st to endNight
332444446%9%58%
3487
September1st to 10thNight
7%214334245%63%
1900
11th to 20thNight
7%31433335%7%60%
1981
21st to endNight
10%414232235%63%
2090
October1st to 10thNight
7%41222222373%
3635
11th to 20thNight
7%5%25%33335%6%59%
3778
21st to endNight
9%6%1433435%7%54%
4467
November1st to 10thNight
8%6%25%33446%7%52%
2535
11th to 20thNight
6%5%25%43436%7%55%
2600
21st to endNight
47%25%43446%7%55%
2692
December1st to 10thNight
47%36%44436%7%51%
2660
11th to 20thNight
36%26%5%45%45%7%52%
3271
21st to endNight
9%11%36%33335%6%47%
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
28%6%22%29%15%1
2539
11th to 20thDay
36%7%17%26%13%2
2540
21st to endDay
25%5%22%33%12%3
2822
February1st to 10thDay
42%6%14%23%13%2
1710
11th to 20thDay
39%6%15%22%13%4
1834
21st to endDay
34%6%17%26%15%2
1570
March1st to 10thDay
27%5%11%26%23%7%
3130
11th to 20thDay
26%6%20%34%13%1
3255
21st to endDay
44%9%16%24%6%1
4165
April1st to 10thDay
38%6%17%25%11%4
2280
11th to 20thDay
41%6%12%22%15%2
2254
21st to endDay
39%5%16%27%12%1
2400
May1st to 10thDay
43%7%15%20%11%3
4179
11th to 20thDay
34%8%14%28%14%2
4392
21st to endDay
35%7%17%28%11%1
4825
June1st to 10thDay
27%8%20%28%13%2
2660
11th to 20thDay
29%6%17%27%16%6%
2660
21st to endDay
19%6%13%30%24%7%
2660
July1st to 10thDay
22%6%10%31%28%4
4361
11th to 20thDay
20%5%11%30%25%9%
4355
21st to endDay
18%5%10%24%27%17%
4651
August1st to 10thDay
29%5%16%25%18%8%
4396
11th to 20thDay
26%5%14%27%22%6%
3846
21st to endDay
20%310%22%27%17%
4179
September1st to 10thDay
21%49%26%27%13%
2280
11th to 20thDay
21%5%10%28%26%11%
2199
21st to endDay
24%38%33%26%5%
2090
October1st to 10thDay
18%38%18%34%19%
3325
11th to 20thDay
24%311%37%21%4
3105
21st to endDay
33%314%29%17%4
3091
November1st to 10thDay
27%6%14%27%21%5%
1763
11th to 20thDay
25%5%14%31%19%5%
1800
21st to endDay
28%5%15%31%17%3
1582
December1st to 10thDay
29%7%18%26%18%2
1520
11th to 20thDay
26%6%19%35%13%1
1924
21st to endDay
38%5%10%29%16%2
2794
January1st to 10thNight
35%6%14%31%12%1
4417
11th to 20thNight
36%8%17%25%11%2
4430
21st to endNight
27%6%23%28%15%1
4873
February1st to 10thNight
40%7%17%24%12%1
2470
11th to 20thNight
36%8%15%25%11%4
2242
21st to endNight
36%5%13%26%16%4
1884
March1st to 10thNight
32%6%12%29%19%2
3734
11th to 20thNight
30%7%16%28%18%1
3699
21st to endNight
45%9%19%20%7%1
3477
April1st to 10thNight
37%8%15%24%14%3
1900
11th to 20thNight
40%6%13%24%13%3
1877
21st to endNight
38%8%15%24%13%2
1778
May1st to 10thNight
40%7%13%24%13%2
2788
11th to 20thNight
28%8%15%37%10%3
2518
21st to endNight
37%9%15%26%11%2
2762
June1st to 10thNight
29%8%24%25%12%2
1520
11th to 20thNight
31%9%19%24%13%4
1520
21st to endNight
22%7%17%29%21%6%
1520
July1st to 10thNight
30%411%27%23%5%
2500
11th to 20thNight
21%415%34%19%8%
2492
21st to endNight
20%413%29%25%8%
2674
August1st to 10thNight
33%5%18%21%17%6%
2520
11th to 20thNight
32%416%24%20%4
3043
21st to endNight
24%411%24%27%9%
3487
September1st to 10thNight
24%38%27%27%10%
1900
11th to 20thNight
23%5%11%26%26%8%
1981
21st to endNight
26%46%29%25%10%
2090
October1st to 10thNight
19%37%19%34%18%
3635
11th to 20thNight
26%310%36%21%4
3778
21st to endNight
30%411%29%17%8%
4467
November1st to 10thNight
30%5%15%26%20%5%
2535
11th to 20thNight
28%5%13%30%20%5%
2600
21st to endNight
27%6%14%29%21%3
2692
December1st to 10thNight
30%7%16%28%17%3
2660
11th to 20thNight
28%7%17%34%12%1
3272
21st to endNight
37%5%12%31%12%3
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
411%40%29%13%3
270
11th to 20thDay
11%19%36%26%7%
270
21st to endDay
9%24%41%19%6%1
297
February1st to 10thDay
14%19%49%18%1
270
11th to 20thDay
9%22%47%17%5%
270
21st to endDay
7%24%41%25%3
225
March1st to 10thDay
7%26%36%24%7%1
270
11th to 20thDay
14%13%35%29%8%1
308
21st to endDay
19%18%30%24%7%1
506
April1st to 10thDay
18%21%39%18%4
460
11th to 20thDay
19%24%35%18%4
452
21st to endDay
16%16%31%27%10%1
580
May1st to 10thDay
17%16%30%23%12%2
653
11th to 20thDay
19%9%25%27%17%4
675
21st to endDay
17%12%26%28%14%2
734
June1st to 10thDay
8%8%26%31%22%5%
680
11th to 20thDay
11%11%35%30%12%1
680
21st to endDay
8%6%28%36%19%3
680
July1st to 10thDay
6%422%39%25%4
671
11th to 20thDay
4430%42%19%2
668
21st to endDay
6%423%39%26%3
739
August1st to 10thDay
7%423%44%21%3
676
11th to 20thDay
5%5%27%34%24%5%
518
21st to endDay
5%8%27%35%22%4
539
September1st to 10thDay
6%6%29%37%18%4
490
11th to 20thDay
9%7%26%32%21%5%
409
21st to endDay
13%12%26%30%15%3
300
October1st to 10thDay
15%11%24%27%17%6%
300
11th to 20thDay
16%14%35%23%10%3
300
21st to endDay
11%17%33%26%11%1
330
November1st to 10thDay
12%17%36%24%9%2
300
11th to 20thDay
12%15%40%27%6%
300
21st to endDay
10%13%43%27%7%
282
December1st to 10thDay
9%19%39%27%7%
270
11th to 20thDay
8%17%52%20%3
270
21st to endDay
11%18%43%22%41
297
January1st to 10thNight
5%13%40%30%11%
950
11th to 20thNight
5%16%45%26%7%1
950
21st to endNight
8%13%45%29%5%
1045
February1st to 10thNight
9%12%45%28%5%1
760
11th to 20thNight
8%11%41%33%5%1
744
21st to endNight
10%11%42%31%5%
628
March1st to 10thNight
10%11%38%36%6%
760
11th to 20thNight
9%7%34%41%9%1
751
21st to endNight
17%11%30%33%8%
627
April1st to 10thNight
18%9%34%36%4
570
11th to 20thNight
17%12%33%33%5%
563
21st to endNight
16%11%26%35%11%1
570
May1st to 10thNight
15%9%28%35%12%1
570
11th to 20thNight
15%7%24%36%17%1
561
21st to endNight
18%7%30%34%11%
617
June1st to 10thNight
8%5%27%45%15%1
570
11th to 20thNight
13%6%33%39%8%1
570
21st to endNight
5%427%52%12%
570
July1st to 10thNight
5%421%45%24%1
555
11th to 20thNight
4328%50%14%
552
21st to endNight
4121%56%17%
624
August1st to 10thNight
4325%51%17%1
567
11th to 20thNight
5%418%52%20%1
564
21st to endNight
4423%46%22%1
627
September1st to 10thNight
9%321%48%19%1
570
11th to 20thNight
8%6%24%41%20%1
570
21st to endNight
12%7%25%39%18%
570
October1st to 10thNight
14%6%26%36%17%1
660
11th to 20thNight
12%8%28%39%12%
760
21st to endNight
12%8%35%34%10%1
1045
November1st to 10thNight
11%7%36%36%9%2
975
11th to 20thNight
10%10%38%35%7%
1000
21st to endNight
6%10%37%40%7%
973
December1st to 10thNight
7%12%47%28%6%
950
11th to 20thNight
6%9%44%34%6%
950
21st to endNight
11%13%40%28%7%
1045
Page generated at 2024-11-22 06:02:26. Version ac07

Copyright © 2024 Attilla Danko.


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