Caresland
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caresland clear sky chart from 2005-11-06 to 2024-11-04.

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
41%
24261
14%
98658
10%
24096
47%
24096
18%
61439

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
33%
935
14%
4669
8%
926
38%
926
11%
3122
January11th to 20thNight
36%
942
19%
4626
10%
929
43%
929
13%
3019
January21st to endNight
33%
820
13%
4776
12%
814
43%
814
12%
2738
February1st to 10thNight
38%
760
14%
2641
12%
760
44%
760
17%
1817
February11th to 20thNight
37%
742
14%
2403
11%
740
43%
740
18%
1670
February21st to endNight
39%
628
15%
1941
10%
628
46%
628
21%
1320
March1st to 10thNight
37%
755
16%
3613
11%
744
43%
744
12%
2444
March11th to 20thNight
36%
750
16%
3346
10%
740
44%
740
18%
1871
March21st to endNight
35%
825
6%
3774
4%
814
40%
814
10%
3046
April1st to 10thNight
35%
694
14%
1834
5%
694
40%
694
22%
1318
April11th to 20thNight
37%
563
14%
1691
9%
563
41%
563
19%
1215
April21st to endNight
37%
570
11%
1710
8%
570
41%
570
20%
1182
May1st to 10thNight
41%
510
8%
2589
8%
503
45%
503
11%
1854
May11th to 20thNight
50%
368
10%
2155
14%
364
52%
364
15%
1259
May21st to endNight
45%
404
3%
2406
4%
399
46%
399
10%
1646
June1st to 10thNight
45%
380
2%
1330
1%
380
46%
380
17%
929
June11th to 20thNight
40%
380
1%
1330
0%
380
40%
380
18%
923
June21st to endNight
57%
380
1%
1330
0%
380
57%
380
27%
776
July1st to 10thNight
64%
362
2%
1980
0%
360
65%
360
19%
1077
July11th to 20thNight
59%
360
4%
1916
5%
359
61%
359
21%
912
July21st to endNight
65%
408
10%
2143
17%
383
70%
383
27%
957
August1st to 10thNight
63%
372
15%
2345
20%
367
67%
367
15%
1306
August11th to 20thNight
63%
544
11%
2662
16%
540
66%
540
22%
1519
August21st to endNight
58%
617
17%
2844
17%
605
64%
605
27%
1368
September1st to 10thNight
54%
645
20%
1818
14%
645
57%
645
34%
1100
September11th to 20thNight
55%
760
18%
2090
13%
760
58%
760
32%
1325
September21st to endNight
47%
760
21%
2090
13%
760
53%
760
36%
1251
October1st to 10thNight
48%
750
28%
3380
13%
740
55%
740
22%
1739
October11th to 20thNight
41%
752
16%
3675
11%
740
51%
740
20%
1951
October21st to endNight
38%
823
23%
4219
12%
813
48%
813
17%
2288
November1st to 10thNight
32%
871
17%
2567
9%
871
40%
871
20%
1804
November11th to 20thNight
32%
950
19%
2698
10%
950
41%
950
24%
1824
November21st to endNight
36%
950
15%
2850
7%
950
43%
950
24%
1891
December1st to 10thNight
39%
950
16%
2850
10%
950
44%
950
20%
1989
December11th to 20thNight
34%
949
15%
3456
8%
949
40%
949
17%
2319
December21st to endNight
35%
1032
11%
4911
7%
1026
42%
1026
14%
2670

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%8%38%5%5%5%46%8%40%
105574
Night
7%9%39%5%5%5%46%8%38%
101993
TransparencyDay
40%7%15%25%11%2
105318
Night
42%7%14%23%12%2
101895
SeeingDay
12%7%25%30%19%6%
15396
Night
12%6%30%35%15%2
24446

By Month

Percentage Cloud Cover NW (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
310%6%11%6%5%5%5%7%8%33%
2219
11th to 20thDay
48%413%7%5%5%7%8%6%32%
2213
21st to endDay
48%39%7%5%5%47%8%40%
2794
February1st to 10thDay
5%11%5%12%7%7%7%46%9%27%
1538
11th to 20thDay
6%13%5%10%6%7%5%6%7%8%28%
1665
21st to endDay
313%6%11%6%7%5%38%8%29%
1510
March1st to 10thDay
311%5%14%8%6%6%45%7%32%
3138
11th to 20thDay
7%9%36%44445%9%45%
3480
21st to endDay
9%21%6%13%5%4435%6%24%
3843
April1st to 10thDay
9%13%410%6%6%5%5%7%7%29%
2346
11th to 20thDay
10%12%39%6%5%6%47%7%31%
2440
21st to endDay
12%12%39%6%5%5%5%5%7%32%
2470
May1st to 10thDay
19%13%47%5%5%435%6%30%
4295
11th to 20thDay
9%7%38%6%6%6%5%7%10%31%
4694
21st to endDay
15%9%39%6%6%7%5%6%7%26%
5161
June1st to 10thDay
15%8%26%6%6%6%5%7%8%32%
2850
11th to 20thDay
18%8%36%5%5%6%6%6%7%29%
2850
21st to endDay
8%5%25%5%45%5%8%10%43%
2850
July1st to 10thDay
6%425%45%447%9%51%
4740
11th to 20thDay
6%31434446%10%54%
4740
21st to endDay
331333446%9%62%
5050
August1st to 10thDay
8%6%26%445%5%7%9%43%
4401
11th to 20thDay
6%5%26%445%47%10%48%
4030
21st to endDay
10%31433445%8%55%
4521
September1st to 10thDay
9%6%26%44435%6%51%
2359
11th to 20thDay
15%8%35%34435%7%44%
2090
21st to endDay
9%7%26%44435%8%46%
2090
October1st to 10thDay
7%6%37%5%5%5%5%7%8%43%
3316
11th to 20thDay
6%7%27%45%5%46%9%46%
2950
21st to endDay
6%8%37%45%6%45%7%45%
3101
November1st to 10thDay
9%16%5%9%5%5%5%45%7%31%
1564
11th to 20thDay
7%10%39%6%5%5%36%8%39%
1482
21st to endDay
411%6%8%5%5%5%48%10%34%
1330
December1st to 10thDay
5%14%412%6%5%6%45%6%33%
1330
11th to 20thDay
311%5%14%7%6%5%5%7%6%32%
1682
21st to endDay
48%37%5%45%46%10%43%
2442
January1st to 10thNight
412%5%13%7%6%6%5%6%9%26%
4726
11th to 20thNight
38%6%13%6%6%6%5%6%8%33%
4699
21st to endNight
411%410%6%5%446%7%39%
4862
February1st to 10thNight
5%12%412%6%6%6%5%5%9%31%
2641
11th to 20thNight
5%14%411%6%5%5%5%7%8%29%
2402
21st to endNight
311%5%12%7%6%5%37%8%33%
1941
March1st to 10thNight
310%5%14%8%7%6%5%7%9%27%
3736
11th to 20thNight
7%9%36%5%5%446%9%43%
3498
21st to endNight
9%21%6%14%6%5%5%46%6%19%
3808
April1st to 10thNight
8%14%411%6%5%5%47%9%29%
1834
11th to 20thNight
9%13%410%6%6%446%7%32%
1691
21st to endNight
10%12%49%6%5%5%5%6%9%32%
1710
May1st to 10thNight
19%13%38%45%445%6%29%
2668
11th to 20thNight
10%8%38%5%6%5%5%8%10%33%
2199
21st to endNight
14%9%39%7%6%6%5%7%7%27%
2414
June1st to 10thNight
14%8%37%6%5%6%6%6%7%32%
1330
11th to 20thNight
16%6%28%5%5%6%5%7%8%30%
1330
21st to endNight
7%426%45%5%5%7%8%46%
1330
July1st to 10thNight
6%426%5%5%6%5%6%8%48%
2220
11th to 20thNight
431434449%13%50%
2220
21st to endNight
4415%33437%8%58%
2500
August1st to 10thNight
9%6%27%45%5%5%7%9%42%
2529
11th to 20thNight
6%427%5%45%5%8%11%43%
2808
21st to endNight
8%32333446%9%54%
3146
September1st to 10thNight
10%5%36%43446%7%48%
1818
11th to 20thNight
13%7%25%33435%7%49%
2090
21st to endNight
8%6%25%44447%8%47%
2090
October1st to 10thNight
7%6%25%44446%8%50%
3645
11th to 20thNight
6%7%26%44446%8%48%
3962
21st to endNight
5%8%27%45%5%5%7%7%44%
4457
November1st to 10thNight
8%15%38%5%45%46%8%34%
2567
11th to 20thNight
5%11%38%6%5%5%5%7%7%38%
2698
21st to endNight
5%11%38%5%45%47%9%38%
2850
December1st to 10thNight
413%410%6%6%6%5%7%6%34%
2850
11th to 20thNight
39%412%7%6%6%5%8%9%32%
3510
21st to endNight
49%48%5%5%5%5%6%7%44%
5214

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
45%7%15%23%9%2
2219
11th to 20thDay
47%7%11%15%16%4
2234
21st to endDay
40%8%13%30%8%1
2794
February1st to 10thDay
54%7%14%15%8%2
1538
11th to 20thDay
50%8%13%19%9%1
1674
21st to endDay
51%6%12%20%11%1
1510
March1st to 10thDay
51%5%14%17%12%1
3138
11th to 20thDay
35%6%19%25%14%1
3481
21st to endDay
61%6%12%16%5%
3843
April1st to 10thDay
50%8%14%18%9%1
2346
11th to 20thDay
49%5%12%22%10%2
2440
21st to endDay
50%6%13%20%10%1
2470
May1st to 10thDay
54%7%10%23%5%
4295
11th to 20thDay
43%9%16%23%8%
4698
21st to endDay
53%7%14%19%6%1
5162
June1st to 10thDay
46%8%15%21%8%1
2850
11th to 20thDay
50%8%14%18%7%2
2850
21st to endDay
33%9%18%27%10%2
2850
July1st to 10thDay
27%7%17%28%17%3
4666
11th to 20thDay
24%7%19%34%14%1
4659
21st to endDay
18%6%12%30%25%9%
4890
August1st to 10thDay
34%8%15%35%8%1
4384
11th to 20thDay
30%7%22%31%8%2
4069
21st to endDay
27%6%18%35%14%1
4520
September1st to 10thDay
32%6%14%27%15%6%
2359
11th to 20thDay
39%6%14%27%12%2
2090
21st to endDay
36%6%14%29%12%3
2090
October1st to 10thDay
37%6%17%31%8%1
3316
11th to 20thDay
33%6%18%28%13%3
2950
21st to endDay
38%5%10%33%12%1
3101
November1st to 10thDay
51%8%11%20%9%2
1564
11th to 20thDay
44%6%15%24%10%1
1482
21st to endDay
42%7%17%23%9%2
1330
December1st to 10thDay
50%7%11%17%12%3
1330
11th to 20thDay
49%7%14%22%7%1
1684
21st to endDay
35%7%12%24%18%5%
2442
January1st to 10thNight
51%7%14%21%6%2
4726
11th to 20thNight
48%6%11%15%15%4
4740
21st to endNight
42%6%14%25%11%1
4862
February1st to 10thNight
50%6%13%18%11%2
2641
11th to 20thNight
49%7%12%19%11%1
2403
21st to endNight
47%5%12%21%11%2
1941
March1st to 10thNight
50%7%13%21%9%1
3736
11th to 20thNight
36%8%20%23%13%1
3498
21st to endNight
64%7%11%12%41
3808
April1st to 10thNight
50%6%14%18%12%
1834
11th to 20thNight
51%7%11%21%10%1
1691
21st to endNight
47%7%14%20%9%2
1710
May1st to 10thNight
55%7%10%22%7%
2668
11th to 20thNight
40%9%15%26%9%1
2199
21st to endNight
51%10%15%16%7%1
2414
June1st to 10thNight
48%9%13%19%10%1
1330
11th to 20thNight
47%9%16%17%8%2
1330
21st to endNight
32%10%20%26%11%1
1330
July1st to 10thNight
31%8%16%24%18%2
2185
11th to 20thNight
23%10%20%34%10%3
2178
21st to endNight
22%7%11%30%22%7%
2421
August1st to 10thNight
35%9%13%28%14%1
2521
11th to 20thNight
31%10%22%27%9%1
2835
21st to endNight
25%6%19%34%13%3
3146
September1st to 10thNight
33%6%15%25%15%6%
1818
11th to 20thNight
36%7%13%26%13%5%
2090
21st to endNight
32%5%18%26%14%4
2090
October1st to 10thNight
31%6%15%28%18%2
3645
11th to 20thNight
33%6%17%25%16%2
3962
21st to endNight
36%6%12%32%13%1
4457
November1st to 10thNight
47%8%11%21%11%2
2567
11th to 20thNight
42%8%15%20%13%2
2698
21st to endNight
41%9%17%21%10%3
2850
December1st to 10thNight
48%7%13%20%10%3
2850
11th to 20thNight
45%9%17%22%6%1
3507
21st to endNight
38%5%11%26%15%4
5214

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
8%432%31%14%11%
180
11th to 20thDay
6%7%29%36%16%6%
180
21st to endDay
8%8%27%37%17%4
198
February1st to 10thDay
12%8%28%37%11%4
189
11th to 20thDay
9%8%32%33%15%3
270
21st to endDay
8%8%30%35%16%3
322
March1st to 10thDay
10%10%34%29%13%5%
460
11th to 20thDay
8%11%30%33%14%4
460
21st to endDay
13%13%32%22%15%6%
506
April1st to 10thDay
12%11%31%31%12%3
460
11th to 20thDay
13%9%28%29%16%5%
452
21st to endDay
18%11%26%27%15%4
460
May1st to 10thDay
19%9%22%22%22%6%
518
11th to 20thDay
14%6%20%32%22%6%
675
21st to endDay
19%420%27%22%8%
734
June1st to 10thDay
15%7%24%31%18%4
680
11th to 20thDay
19%7%25%30%16%3
680
21st to endDay
9%424%32%23%8%
680
July1st to 10thDay
9%417%33%28%8%
671
11th to 20thDay
11%419%32%25%8%
668
21st to endDay
6%5%21%32%27%9%
687
August1st to 10thDay
9%5%22%33%23%9%
487
11th to 20thDay
8%221%31%29%9%
477
21st to endDay
12%6%19%32%19%12%
539
September1st to 10thDay
12%6%25%30%20%7%
490
11th to 20thDay
18%7%21%28%20%6%
490
21st to endDay
13%12%26%31%14%4
490
October1st to 10thDay
17%8%19%29%20%6%
394
11th to 20thDay
9%8%32%26%17%7%
300
21st to endDay
14%12%33%26%12%3
330
November1st to 10thDay
18%8%30%27%14%3
279
11th to 20thDay
14%9%38%27%11%2
252
21st to endDay
7%8%35%27%13%10%
180
December1st to 10thDay
7%8%36%30%14%4
180
11th to 20thDay
9%9%38%29%12%2
180
21st to endDay
9%426%32%25%5%
198
January1st to 10thNight
8%8%34%35%12%2
950
11th to 20thNight
9%6%36%34%13%2
950
21st to endNight
11%9%32%33%13%2
836
February1st to 10thNight
9%9%29%35%16%2
760
11th to 20thNight
11%6%31%37%13%1
744
21st to endNight
6%6%29%35%20%4
628
March1st to 10thNight
9%5%32%35%16%3
760
11th to 20thNight
10%7%35%34%13%1
760
21st to endNight
14%7%28%35%14%3
836
April1st to 10thNight
14%6%31%34%13%2
694
11th to 20thNight
15%7%31%34%13%
563
21st to endNight
15%8%31%34%12%1
570
May1st to 10thNight
18%5%26%33%17%1
513
11th to 20thNight
12%324%37%22%1
374
21st to endNight
19%5%20%37%17%2
411
June1st to 10thNight
17%7%24%38%13%2
380
11th to 20thNight
17%330%33%16%1
380
21st to endNight
10%322%41%22%2
380
July1st to 10thNight
9%5%14%45%27%1
370
11th to 20thNight
9%221%44%22%2
368
21st to endNight
6%122%44%26%1
416
August1st to 10thNight
11%316%40%29%2
378
11th to 20thNight
9%418%45%24%2
561
21st to endNight
10%5%20%40%24%1
627
September1st to 10thNight
13%421%40%20%2
645
11th to 20thNight
17%418%38%22%2
760
21st to endNight
11%5%31%35%16%2
760
October1st to 10thNight
16%424%37%18%2
760
11th to 20thNight
11%6%33%33%15%3
760
21st to endNight
11%7%34%34%13%1
836
November1st to 10thNight
15%7%38%31%9%1
871
11th to 20thNight
10%10%41%29%8%2
950
21st to endNight
10%6%38%34%11%3
950
December1st to 10thNight
10%7%31%34%15%2
950
11th to 20thNight
8%7%37%35%11%1
950
21st to endNight
13%5%33%33%14%3
1045
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