Carefree
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carefree clear sky chart from 2005-11-06 to 2024-01-16.

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
74%
24078
36%
74390
32%
24032
79%
24032
53%
35225

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
65%
758
33%
2457
30%
756
74%
756
44%
1231
January11th to 20thNight
65%
744
38%
2418
35%
744
74%
744
48%
1163
January21st to endNight
59%
792
36%
2574
33%
792
69%
792
41%
1341
February1st to 10thNight
69%
720
37%
2268
34%
720
78%
720
52%
1061
February11th to 20thNight
64%
700
34%
2099
30%
700
73%
700
46%
1093
February21st to endNight
61%
592
35%
1768
32%
592
68%
592
45%
914
March1st to 10thNight
63%
720
36%
1980
29%
720
71%
720
53%
1005
March11th to 20thNight
70%
720
38%
1980
32%
720
75%
720
56%
997
March21st to endNight
68%
792
38%
2178
28%
792
76%
792
57%
1074
April1st to 10thNight
73%
720
35%
1980
25%
720
79%
720
61%
939
April11th to 20thNight
67%
608
39%
1852
29%
608
76%
608
62%
786
April21st to endNight
73%
540
47%
1631
37%
540
82%
540
70%
667
May1st to 10thNight
75%
540
41%
1620
33%
540
81%
540
64%
697
May11th to 20thNight
80%
531
42%
1594
35%
531
83%
531
68%
658
May21st to endNight
81%
582
41%
1746
33%
582
85%
582
77%
683
June1st to 10thNight
84%
540
37%
1620
31%
540
85%
540
69%
668
June11th to 20thNight
88%
540
39%
1620
35%
540
89%
540
83%
604
June21st to endNight
87%
540
33%
1620
30%
540
88%
540
70%
674
July1st to 10thNight
88%
525
29%
1575
25%
525
88%
525
55%
758
July11th to 20thNight
87%
522
27%
1566
23%
522
87%
522
50%
778
July21st to endNight
80%
591
25%
1674
22%
558
80%
558
37%
972
August1st to 10thNight
89%
537
29%
1602
24%
534
89%
534
50%
801
August11th to 20thNight
85%
534
33%
1602
30%
534
85%
534
45%
835
August21st to endNight
85%
695
33%
1993
31%
695
85%
695
49%
1057
September1st to 10thNight
81%
720
33%
1980
31%
720
82%
720
50%
1051
September11th to 20thNight
87%
720
42%
1980
37%
720
88%
720
67%
910
September21st to endNight
82%
720
39%
1980
30%
720
86%
720
63%
940
October1st to 10thNight
77%
720
40%
2012
32%
720
81%
720
60%
961
October11th to 20thNight
80%
720
44%
2160
39%
720
84%
720
72%
876
October21st to endNight
76%
792
46%
2376
36%
792
85%
792
70%
983
November1st to 10thNight
79%
740
43%
2220
39%
740
84%
740
64%
970
November11th to 20thNight
78%
760
41%
2441
39%
760
84%
760
61%
1025
November21st to endNight
66%
760
39%
2470
36%
760
74%
760
49%
1153
December1st to 10thNight
67%
760
38%
2470
35%
760
74%
760
48%
1169
December11th to 20thNight
63%
759
33%
2937
33%
758
70%
758
32%
1593
December21st to endNight
62%
824
22%
4347
33%
817
68%
817
25%
2138

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
4313323346%68%
74975
Night
5%313323346%67%
74874
TransparencyDay
17%35%12%24%39%
74702
Night
18%35%11%23%39%
74669
SeeingDay
5%419%35%28%9%
13856
Night
6%212%41%35%4
24099

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
7%424323345%63%
1708
11th to 20thDay
7%314323345%67%
1669
21st to endDay
9%42332335%6%62%
1782
February1st to 10thDay
5%422223436%67%
1688
11th to 20thDay
10%413323437%59%
1750
21st to endDay
8%413323446%62%
1488
March1st to 10thDay
7%323434348%60%
1980
11th to 20thDay
5%422324346%65%
1980
21st to endDay
5%32332433470%
2178
April1st to 10thDay
321221345%7%69%
1980
11th to 20thDay
2212222345%75%
2054
21st to endDay
2212212245%77%
2325
May1st to 10thDay
1112212236%78%
2340
11th to 20thDay
2212223236%77%
2301
21st to endDay
211111122485%
2530
June1st to 10thDay
1111212235%80%
2340
11th to 20thDay
111111112388%
2340
21st to endDay
1212212235%78%
2340
July1st to 10thDay
221332446%8%66%
2340
11th to 20thDay
3314445%6%8%11%51%
2340
21st to endDay
6%4245%36%7%7%11%45%
2545
August1st to 10thDay
43234335%5%8%59%
2328
11th to 20thDay
3213435%5%7%9%57%
2299
21st to endDay
32134335%7%8%62%
2356
September1st to 10thDay
4313423446%65%
1980
11th to 20thDay
321121223479%
1980
21st to endDay
321222133477%
1980
October1st to 10thDay
4212223335%72%
1946
11th to 20thDay
211211223384%
1800
21st to endDay
111222323478%
1980
November1st to 10thDay
3212222346%74%
1859
11th to 20thDay
221331224474%
1734
21st to endDay
8%322322345%66%
1710
December1st to 10thDay
7%3245%34345%60%
1710
11th to 20thDay
8%436%4235%7%6%50%
2169
21st to endDay
10%5%25%424445%54%
3146
January1st to 10thNight
8%32332445%6%61%
2457
11th to 20thNight
8%313323335%66%
2418
21st to endNight
10%424423335%61%
2574
February1st to 10thNight
5%32322235%5%67%
2268
11th to 20thNight
8%5%13323445%62%
2098
21st to endNight
10%414323435%61%
1768
March1st to 10thNight
6%42331345%7%63%
1980
11th to 20thNight
8%412313235%68%
1980
21st to endNight
6%22322335%7%66%
2178
April1st to 10thNight
321332445%7%68%
1980
11th to 20thNight
3212322335%76%
1852
21st to endNight
2212212235%79%
1631
May1st to 10thNight
1113223436%74%
1620
11th to 20thNight
22221223480%
1594
21st to endNight
21111112485%
1746
June1st to 10thNight
1212213235%77%
1620
11th to 20thNight
11111122486%
1620
21st to endNight
121221233478%
1620
July1st to 10thNight
2213335%5%6%8%61%
1620
11th to 20thNight
2223436%5%6%11%57%
1620
21st to endNight
5%425%5%37%6%8%12%43%
1773
August1st to 10thNight
2214335%6%7%10%57%
1611
11th to 20thNight
2225%435%6%6%10%54%
1602
21st to endNight
23145%35%5%6%7%59%
1993
September1st to 10thNight
4313335%5%6%8%58%
1980
11th to 20thNight
2213222335%76%
1980
21st to endNight
311322333475%
1980
October1st to 10thNight
4222322245%72%
2012
11th to 20thNight
221121123482%
2160
21st to endNight
1112222235%79%
2376
November1st to 10thNight
4212212345%72%
2220
11th to 20thNight
3212312235%75%
2441
21st to endNight
7%313323336%66%
2470
December1st to 10thNight
8%313323347%63%
2470
11th to 20thNight
9%5%25%5%33447%52%
3041
21st to endNight
10%5%2443443456%
4521

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
24%25%16%28%25%
1709
11th to 20thDay
21%25%14%27%30%
1669
21st to endDay
24%2416%27%27%
1782
February1st to 10thDay
19%3415%25%35%
1688
11th to 20thDay
26%3414%25%29%
1760
21st to endDay
22%3315%29%28%
1488
March1st to 10thDay
23%3311%27%33%
1980
11th to 20thDay
20%3312%28%34%
1980
21st to endDay
20%2310%33%31%
2178
April1st to 10thDay
14%2211%36%35%
1980
11th to 20thDay
12%229%25%49%
2057
21st to endDay
11%238%26%51%
2325
May1st to 10thDay
9%248%26%51%
2340
11th to 20thDay
11%239%23%53%
2304
21st to endDay
8%116%24%61%
2530
June1st to 10thDay
8%125%22%62%
2340
11th to 20thDay
6%11211%79%
2340
21st to endDay
10%225%16%65%
2340
July1st to 10thDay
15%37%11%18%45%
2276
11th to 20thDay
22%8%13%21%22%14%
2271
21st to endDay
28%8%13%21%17%13%
2404
August1st to 10thDay
20%6%9%16%17%32%
2313
11th to 20thDay
20%7%10%20%22%22%
2299
21st to endDay
18%5%8%15%30%24%
2356
September1st to 10thDay
20%36%13%23%35%
1980
11th to 20thDay
11%238%28%48%
1980
21st to endDay
12%346%25%50%
1980
October1st to 10thDay
14%35%13%24%41%
1946
11th to 20thDay
8%137%24%57%
1800
21st to endDay
11%239%26%48%
1980
November1st to 10thDay
12%2314%31%39%
1859
11th to 20thDay
14%2211%27%43%
1734
21st to endDay
21%2411%26%36%
1710
December1st to 10thDay
26%3414%22%31%
1710
11th to 20thDay
30%5%7%18%21%20%
2168
21st to endDay
31%5%6%19%26%14%
3146
January1st to 10thNight
24%45%14%28%26%
2457
11th to 20thNight
22%3313%28%31%
2418
21st to endNight
27%3411%25%29%
2574
February1st to 10thNight
19%35%11%26%37%
2268
11th to 20thNight
25%36%12%24%30%
2099
21st to endNight
25%3410%27%32%
1768
March1st to 10thNight
19%4311%26%37%
1980
11th to 20thNight
19%3310%25%40%
1980
21st to endNight
17%3411%32%32%
2178
April1st to 10thNight
16%2311%27%42%
1980
11th to 20thNight
13%136%25%51%
1852
21st to endNight
10%238%24%55%
1631
May1st to 10thNight
12%249%23%50%
1620
11th to 20thNight
10%228%22%56%
1595
21st to endNight
8%125%20%65%
1746
June1st to 10thNight
11%12318%65%
1620
11th to 20thNight
5%12312%77%
1620
21st to endNight
11%235%11%69%
1620
July1st to 10thNight
17%48%11%15%45%
1575
11th to 20thNight
19%5%13%20%24%19%
1566
21st to endNight
28%8%12%20%18%15%
1674
August1st to 10thNight
18%7%9%17%18%31%
1602
11th to 20thNight
22%6%12%18%17%25%
1602
21st to endNight
22%5%8%16%24%26%
1993
September1st to 10thNight
22%5%8%17%17%32%
1980
11th to 20thNight
12%349%24%49%
1980
21st to endNight
14%336%19%55%
1980
October1st to 10thNight
16%3410%23%45%
2012
11th to 20thNight
10%128%20%59%
2160
21st to endNight
10%239%21%56%
2376
November1st to 10thNight
14%2310%30%41%
2220
11th to 20thNight
14%2311%25%46%
2441
21st to endNight
21%2310%26%38%
2470
December1st to 10thNight
21%3416%22%34%
2470
11th to 20thNight
31%45%12%25%22%
3041
21st to endNight
29%6%6%18%23%18%
4521

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
14%325%33%21%4
270
11th to 20thDay
14%217%40%23%5%
257
21st to endDay
10%422%34%23%7%
264
February1st to 10thDay
6%424%37%25%4
308
11th to 20thDay
14%6%29%33%17%1
415
21st to endDay
12%9%32%35%12%1
346
March1st to 10thDay
7%10%30%38%13%2
420
11th to 20thDay
8%7%29%31%22%4
420
21st to endDay
6%10%35%32%15%2
462
April1st to 10thDay
5%9%27%33%20%6%
420
11th to 20thDay
5%11%32%33%16%4
412
21st to endDay
311%29%33%17%7%
420
May1st to 10thDay
37%27%39%21%4
423
11th to 20thDay
25%24%38%25%6%
448
21st to endDay
27%26%39%21%5%
485
June1st to 10thDay
2418%38%31%8%
450
11th to 20thDay
2223%37%27%10%
450
21st to endDay
2113%42%33%9%
450
July1st to 10thDay
18%35%41%14%
446
11th to 20thDay
46%28%42%20%
444
21st to endDay
5%1325%38%28%
487
August1st to 10thDay
42430%40%21%
447
11th to 20thDay
35%29%45%18%
437
21st to endDay
21327%44%24%
495
September1st to 10thDay
5%27%36%39%12%
450
11th to 20thDay
4210%39%36%10%
450
21st to endDay
4415%32%33%12%
450
October1st to 10thDay
5%220%36%32%5%
416
11th to 20thDay
3119%35%34%9%
270
21st to endDay
2318%37%28%12%
297
November1st to 10thDay
4218%41%27%7%
270
11th to 20thDay
6%117%39%29%8%
270
21st to endDay
8%427%30%23%8%
270
December1st to 10thDay
7%319%40%24%7%
270
11th to 20thDay
7%320%41%26%4
270
21st to endDay
17%424%34%16%4
297
January1st to 10thNight
9%117%47%23%3
760
11th to 20thNight
9%217%44%25%3
744
21st to endNight
13%119%45%20%2
792
February1st to 10thNight
7%217%46%25%3
720
11th to 20thNight
10%218%50%19%2
704
21st to endNight
11%220%44%20%2
592
March1st to 10thNight
7%321%48%20%1
720
11th to 20thNight
8%215%40%29%5%
720
21st to endNight
6%417%45%26%3
792
April1st to 10thNight
3315%51%25%2
720
11th to 20thNight
35%19%46%25%2
608
21st to endNight
3219%47%27%3
540
May1st to 10thNight
2414%48%29%3
540
11th to 20thNight
2212%47%34%2
531
21st to endNight
3112%46%33%4
584
June1st to 10thNight
218%46%41%2
540
11th to 20thNight
117%48%40%3
540
21st to endNight
2441%48%5%
540
July1st to 10thNight
2434%58%3
525
11th to 20thNight
3220%69%7%
522
21st to endNight
5%2319%59%12%
591
August1st to 10thNight
31120%63%12%
537
11th to 20thNight
21225%63%7%
534
21st to endNight
3322%61%11%
695
September1st to 10thNight
5%1428%55%7%
720
11th to 20thNight
3440%48%5%
720
21st to endNight
428%41%39%6%
720
October1st to 10thNight
5%211%47%34%2
720
11th to 20thNight
3112%46%35%3
720
21st to endNight
2215%39%33%8%
792
November1st to 10thNight
5%110%48%31%4
740
11th to 20thNight
3113%48%31%4
760
21st to endNight
8%218%41%28%3
760
December1st to 10thNight
8%216%43%29%2
760
11th to 20thNight
11%316%44%24%3
760
21st to endNight
12%215%46%21%3
836
Page generated at 2024-01-13 17:28:30. Version ac07

Copyright 2024 Attilla Danko


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