Deposit
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Deposit clear sky chart from 2005-11-06 to 2024-02-10.

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
27%
23066
8%
80422
5%
22972
31%
22972
7%
65215

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
11%
753
7%
4396
1%
737
16%
737
2%
3525
January11th to 20thNight
15%
759
6%
4402
2%
740
19%
740
2%
3619
January21st to endNight
12%
831
4%
4573
3%
814
17%
814
2%
3973
February1st to 10thNight
12%
759
7%
2464
3%
759
19%
759
5%
2068
February11th to 20thNight
9%
703
6%
2190
1%
700
15%
700
4%
1859
February21st to endNight
12%
592
9%
1776
3%
592
18%
592
5%
1523
March1st to 10thNight
15%
720
7%
2160
2%
720
21%
720
7%
1806
March11th to 20thNight
15%
720
10%
1980
4%
720
20%
720
8%
1656
March21st to endNight
19%
792
12%
2055
4%
792
24%
792
9%
1675
April1st to 10thNight
17%
720
8%
1800
1%
720
21%
720
9%
1512
April11th to 20thNight
20%
711
10%
1775
3%
711
23%
711
10%
1481
April21st to endNight
24%
720
10%
1800
2%
720
28%
720
11%
1459
May1st to 10thNight
29%
449
10%
1529
7%
449
33%
449
8%
1246
May11th to 20thNight
31%
354
15%
1416
11%
354
38%
354
9%
1078
May21st to endNight
40%
388
12%
1551
13%
388
46%
388
11%
1134
June1st to 10thNight
41%
360
10%
1440
10%
360
47%
360
9%
1076
June11th to 20thNight
44%
360
10%
1440
11%
360
49%
360
11%
1068
June21st to endNight
50%
360
9%
1440
9%
360
54%
360
12%
1066
July1st to 10thNight
56%
350
7%
1400
9%
350
58%
350
11%
1046
July11th to 20thNight
56%
348
10%
1392
12%
348
58%
348
12%
1013
July21st to endNight
52%
394
10%
1486
11%
372
54%
372
11%
1085
August1st to 10thNight
53%
498
9%
1562
6%
496
55%
496
13%
1185
August11th to 20thNight
53%
630
9%
1694
6%
630
54%
630
13%
1356
August21st to endNight
52%
792
9%
1980
5%
792
53%
792
14%
1601
September1st to 10thNight
44%
720
10%
1800
4%
720
46%
720
15%
1447
September11th to 20thNight
47%
720
17%
1818
9%
720
52%
720
18%
1384
September21st to endNight
41%
720
12%
1998
8%
720
44%
720
13%
1595
October1st to 10thNight
35%
720
10%
2160
7%
720
40%
720
11%
1705
October11th to 20thNight
27%
720
9%
2160
3%
720
34%
720
9%
1755
October21st to endNight
18%
792
8%
2472
4%
792
24%
792
7%
2077
November1st to 10thNight
26%
740
11%
2407
7%
740
32%
740
10%
1885
November11th to 20thNight
20%
760
12%
2498
7%
760
28%
760
7%
2034
November21st to endNight
20%
760
9%
2660
4%
760
27%
760
6%
2177
December1st to 10thNight
13%
760
4%
2660
1%
760
16%
760
3%
2318
December11th to 20thNight
14%
760
6%
3243
2%
759
18%
759
4%
2663
December21st to endNight
11%
831
3%
4845
1%
817
14%
817
2%
4065

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
17%11%5%8%6%35%5%5%7%29%
78197
Night
17%11%5%8%6%3445%6%30%
80762
TransparencyDay
37%36%8%13%6%1
77902
Night
38%35%8%12%6%1
80591
SeeingDay
28%16%27%17%9%3
13733
Night
25%16%26%23%9%1
23085

By Month

Percentage Cloud Cover NE (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
14%16%15%11%6%2344420%
2517
11th to 20thDay
14%17%9%13%7%5%6%44417%
2520
21st to endDay
20%17%10%8%10%4434416%
3068
February1st to 10thDay
16%14%7%12%9%5%445%5%19%
1701
11th to 20thDay
13%13%8%12%8%44447%23%
1658
21st to endDay
20%12%412%8%3445%6%22%
1480
March1st to 10thDay
14%12%7%12%7%34445%28%
1797
11th to 20thDay
16%14%5%9%6%34445%28%
1976
21st to endDay
20%13%48%6%3445%5%30%
2300
April1st to 10thDay
17%13%5%7%5%345%45%31%
2160
11th to 20thDay
17%10%37%6%35%45%6%34%
2134
21st to endDay
20%12%46%5%34447%31%
2160
May1st to 10thDay
21%10%36%6%3446%7%30%
2444
11th to 20thDay
20%7%36%5%45%45%7%34%
2478
21st to endDay
16%7%26%5%36%5%6%8%36%
2725
June1st to 10thDay
18%7%36%6%35%5%6%8%32%
2520
11th to 20thDay
18%6%36%6%45%5%7%9%32%
2520
21st to endDay
17%6%26%6%35%6%5%8%34%
2520
July1st to 10thDay
13%6%37%7%46%6%7%9%34%
2520
11th to 20thDay
13%5%25%6%5%6%5%7%9%38%
2520
21st to endDay
13%6%37%6%36%6%7%9%34%
2744
August1st to 10thDay
14%6%35%6%5%7%5%7%9%34%
2363
11th to 20thDay
15%7%37%8%445%6%9%32%
2188
21st to endDay
16%7%26%5%46%6%6%9%34%
2376
September1st to 10thDay
18%8%36%43445%7%37%
2160
11th to 20thDay
15%7%35%43445%7%42%
2142
21st to endDay
18%7%36%5%35%5%5%7%35%
1958
October1st to 10thDay
19%8%46%6%346%5%6%33%
1800
11th to 20thDay
18%11%36%5%45%5%6%6%33%
1800
21st to endDay
25%14%46%5%34445%25%
1882
November1st to 10thDay
15%11%46%43445%6%37%
1671
11th to 20thDay
17%16%6%8%5%34445%30%
1677
21st to endDay
19%15%5%9%6%245%5%6%24%
1520
December1st to 10thDay
19%16%8%11%6%35%5%45%18%
1520
11th to 20thDay
22%14%9%9%5%23345%24%
1906
21st to endDay
23%19%9%9%6%3444415%
2772
January1st to 10thNight
17%14%9%13%6%34446%20%
4429
11th to 20thNight
13%18%7%14%10%44345%19%
4440
21st to endNight
22%16%6%12%10%4433317%
4587
February1st to 10thNight
16%12%6%11%8%45%45%5%23%
2464
11th to 20thNight
14%13%7%12%9%46%5%46%21%
2188
21st to endNight
20%11%411%6%35%45%5%26%
1776
March1st to 10thNight
16%11%7%11%6%34446%28%
2150
11th to 20thNight
16%13%6%8%7%35%445%30%
1979
21st to endNight
16%13%36%6%345%5%6%31%
2055
April1st to 10thNight
19%13%5%7%6%245%47%29%
1800
11th to 20thNight
20%9%37%6%3335%6%35%
1775
21st to endNight
20%9%46%5%35%446%35%
1800
May1st to 10thNight
23%12%35%5%33436%31%
1529
11th to 20thNight
15%7%35%6%35%6%6%7%36%
1415
21st to endNight
13%7%47%435%5%5%8%39%
1550
June1st to 10thNight
16%8%36%5%3335%9%40%
1440
11th to 20thNight
15%7%345%345%5%8%40%
1440
21st to endNight
13%325%5%46%6%6%8%43%
1440
July1st to 10thNight
12%4246%45%46%10%42%
1440
11th to 20thNight
12%5%246%35%5%8%10%42%
1440
21st to endNight
12%6%35%5%345%5%8%42%
1574
August1st to 10thNight
11%6%246%347%7%8%43%
1572
11th to 20thNight
14%7%26%7%46%5%6%7%36%
1694
21st to endNight
15%7%245%3446%8%42%
1980
September1st to 10thNight
16%7%35%5%3445%7%42%
1800
11th to 20thNight
15%5%145%34436%49%
1818
21st to endNight
17%7%25%5%345%5%7%40%
1998
October1st to 10thNight
19%9%26%5%245%5%6%36%
2160
11th to 20thNight
21%9%36%5%33445%37%
2160
21st to endNight
25%13%47%5%34446%26%
2472
November1st to 10thNight
13%13%35%5%345%5%6%38%
2407
11th to 20thNight
20%11%46%5%3445%6%32%
2498
21st to endNight
15%13%5%8%6%45%5%6%7%27%
2660
December1st to 10thNight
19%15%7%9%7%345%47%19%
2660
11th to 20thNight
20%14%6%11%6%445%45%23%
3288
21st to endNight
25%14%9%10%5%34445%17%
4884

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
52%26%8%12%1
2518
11th to 20thDay
54%26%7%10%31
2520
21st to endDay
59%23%6%10%2
3068
February1st to 10thDay
44%35%6%11%5%
1701
11th to 20thDay
39%39%6%12%3
1667
21st to endDay
44%36%7%8%5%
1480
March1st to 10thDay
38%37%8%13%31
1800
11th to 20thDay
39%36%6%12%7%1
1976
21st to endDay
37%36%5%12%8%1
2300
April1st to 10thDay
34%36%6%16%7%2
2160
11th to 20thDay
36%36%6%13%7%2
2134
21st to endDay
33%37%6%13%7%3
2160
May1st to 10thDay
35%37%6%13%7%2
2444
11th to 20thDay
32%37%7%15%8%2
2482
21st to endDay
28%38%11%13%8%1
2725
June1st to 10thDay
32%38%9%13%8%
2520
11th to 20thDay
32%37%10%15%5%1
2520
21st to endDay
32%38%11%15%4
2520
July1st to 10thDay
31%39%9%14%6%1
2450
11th to 20thDay
27%38%11%17%6%
2445
21st to endDay
29%40%9%15%6%1
2591
August1st to 10thDay
32%38%8%16%7%
2349
11th to 20thDay
31%36%9%18%6%
2188
21st to endDay
33%38%6%14%7%1
2376
September1st to 10thDay
31%37%8%16%7%1
2160
11th to 20thDay
27%37%8%15%11%1
2142
21st to endDay
34%38%6%13%8%1
1958
October1st to 10thDay
33%37%7%14%8%
1800
11th to 20thDay
34%39%7%15%5%1
1800
21st to endDay
39%37%7%10%6%1
1882
November1st to 10thDay
27%41%8%15%9%1
1671
11th to 20thDay
39%40%7%10%31
1677
21st to endDay
39%40%9%10%3
1520
December1st to 10thDay
42%41%8%6%3
1520
11th to 20thDay
44%32%10%11%3
1906
21st to endDay
58%26%5%8%3
2772
January1st to 10thNight
51%26%10%10%3
4429
11th to 20thNight
52%27%8%10%3
4440
21st to endNight
61%22%5%10%2
4587
February1st to 10thNight
41%35%8%11%4
2464
11th to 20thNight
39%39%9%10%31
2190
21st to endNight
43%36%6%10%41
1776
March1st to 10thNight
38%36%9%12%4
2160
11th to 20thNight
37%37%8%13%41
1980
21st to endNight
34%36%6%14%9%2
2055
April1st to 10thNight
37%37%6%12%7%1
1800
11th to 20thNight
36%36%7%13%8%
1775
21st to endNight
32%36%7%13%8%3
1800
May1st to 10thNight
37%37%5%10%9%2
1529
11th to 20thNight
30%38%5%16%9%2
1416
21st to endNight
26%38%10%17%7%2
1551
June1st to 10thNight
30%37%10%15%8%
1440
11th to 20thNight
26%38%12%17%5%1
1440
21st to endNight
25%39%12%18%5%
1440
July1st to 10thNight
27%38%10%16%7%1
1400
11th to 20thNight
24%39%12%16%8%
1392
21st to endNight
25%39%11%15%9%1
1486
August1st to 10thNight
26%39%12%16%7%
1562
11th to 20thNight
31%37%10%15%6%
1694
21st to endNight
30%38%8%13%10%1
1980
September1st to 10thNight
29%38%7%17%8%1
1800
11th to 20thNight
25%35%9%18%12%1
1818
21st to endNight
32%37%7%14%11%1
1998
October1st to 10thNight
32%36%8%15%9%
2160
11th to 20thNight
35%36%9%14%5%1
2160
21st to endNight
38%38%7%10%6%1
2472
November1st to 10thNight
28%41%7%13%9%2
2407
11th to 20thNight
33%40%8%12%6%1
2498
21st to endNight
34%41%9%12%3
2660
December1st to 10thNight
41%41%8%8%2
2660
11th to 20thNight
41%35%9%12%3
3288
21st to endNight
55%26%8%9%2
4884

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
34%23%27%14%21
180
11th to 20thDay
48%19%25%6%2
180
21st to endDay
31%28%30%6%5%
283
February1st to 10thDay
32%31%30%6%
267
11th to 20thDay
40%27%27%6%
325
21st to endDay
41%23%25%9%1
346
March1st to 10thDay
34%25%28%10%3
420
11th to 20thDay
35%25%24%12%31
420
21st to endDay
37%24%23%10%5%2
462
April1st to 10thDay
38%18%27%13%4
420
11th to 20thDay
32%22%24%12%8%2
412
21st to endDay
35%16%30%12%5%1
420
May1st to 10thDay
36%16%26%12%6%4
423
11th to 20thDay
23%17%30%20%6%3
447
21st to endDay
21%11%29%22%13%4
485
June1st to 10thDay
26%14%29%20%10%2
450
11th to 20thDay
22%12%29%24%12%2
450
21st to endDay
19%16%32%21%10%2
450
July1st to 10thDay
15%7%29%28%16%5%
445
11th to 20thDay
14%6%29%33%14%5%
444
21st to endDay
18%8%34%25%10%4
488
August1st to 10thDay
16%9%24%26%19%7%
446
11th to 20thDay
17%6%26%29%15%6%
439
21st to endDay
17%11%27%22%15%8%
495
September1st to 10thDay
22%11%23%21%16%7%
450
11th to 20thDay
18%9%27%21%14%10%
450
21st to endDay
24%10%29%20%12%6%
450
October1st to 10thDay
30%10%22%19%13%6%
450
11th to 20thDay
28%17%28%18%8%1
450
21st to endDay
35%17%27%16%5%
446
November1st to 10thDay
27%21%21%21%9%1
365
11th to 20thDay
34%24%21%15%6%1
337
21st to endDay
36%22%32%9%2
180
December1st to 10thDay
41%21%27%6%41
180
11th to 20thDay
38%23%29%8%2
180
21st to endDay
37%25%27%9%11
198
January1st to 10thNight
29%25%30%13%2
760
11th to 20thNight
31%21%26%18%4
760
21st to endNight
25%25%32%16%2
836
February1st to 10thNight
28%23%32%16%2
759
11th to 20thNight
29%27%31%12%1
703
21st to endNight
36%22%27%12%3
592
March1st to 10thNight
30%23%29%16%2
720
11th to 20thNight
30%23%28%15%4
720
21st to endNight
27%23%28%15%7%1
792
April1st to 10thNight
28%21%28%18%3
720
11th to 20thNight
26%18%30%18%7%
711
21st to endNight
26%18%29%22%6%
720
May1st to 10thNight
32%9%24%26%8%
449
11th to 20thNight
18%13%31%30%7%1
354
21st to endNight
17%7%29%31%16%1
389
June1st to 10thNight
21%9%21%39%11%
360
11th to 20thNight
19%6%22%36%15%1
360
21st to endNight
13%6%25%43%13%
360
July1st to 10thNight
14%418%42%19%3
350
11th to 20thNight
13%321%40%21%1
348
21st to endNight
16%317%45%17%1
394
August1st to 10thNight
16%222%35%23%2
498
11th to 20thNight
18%5%12%36%26%3
630
21st to endNight
18%6%15%35%24%2
792
September1st to 10thNight
19%6%21%33%17%3
720
11th to 20thNight
18%7%21%27%21%6%
720
21st to endNight
21%8%24%27%18%3
720
October1st to 10thNight
28%11%20%24%16%2
720
11th to 20thNight
27%11%29%27%6%
720
21st to endNight
34%16%27%19%4
792
November1st to 10thNight
23%16%31%21%9%1
740
11th to 20thNight
29%21%27%17%5%1
760
21st to endNight
24%24%28%19%41
760
December1st to 10thNight
33%23%28%13%3
760
11th to 20thNight
30%24%28%18%1
760
21st to endNight
32%25%28%12%2
836
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