Silver Sands State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Silver Sands State Park clear sky chart from 2005-11-06 to 2024-01-15.

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
36%
23080
19%
74610
10%
23039
46%
23039
23%
47755

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%
760
23%
2649
9%
757
40%
757
21%
1581
January11th to 20thNight
22%
737
19%
2577
6%
737
39%
737
17%
1679
January21st to endNight
23%
792
22%
2704
10%
792
40%
792
22%
1619
February1st to 10thNight
21%
720
17%
2281
6%
720
34%
720
19%
1519
February11th to 20thNight
20%
703
21%
2100
7%
700
37%
700
23%
1382
February21st to endNight
20%
592
25%
1776
9%
592
40%
592
22%
1161
March1st to 10thNight
26%
720
22%
2160
10%
720
42%
720
26%
1359
March11th to 20thNight
29%
720
20%
2106
9%
720
41%
720
24%
1382
March21st to endNight
28%
792
23%
1980
8%
792
39%
792
28%
1354
April1st to 10thNight
31%
720
19%
1800
6%
720
38%
720
25%
1263
April11th to 20thNight
36%
711
18%
1775
5%
711
42%
711
30%
1219
April21st to endNight
33%
636
19%
1716
6%
636
40%
636
27%
1187
May1st to 10thNight
35%
540
14%
1620
7%
540
41%
540
20%
1146
May11th to 20thNight
34%
444
18%
1506
11%
444
42%
444
20%
1007
May21st to endNight
50%
388
13%
1551
15%
388
54%
388
19%
994
June1st to 10thNight
46%
360
16%
1440
18%
360
54%
360
19%
911
June11th to 20thNight
55%
360
15%
1440
18%
360
59%
360
21%
874
June21st to endNight
60%
360
15%
1440
19%
360
64%
360
24%
850
July1st to 10thNight
58%
350
13%
1400
17%
350
61%
350
22%
860
July11th to 20thNight
62%
348
14%
1392
20%
348
64%
348
22%
847
July21st to endNight
61%
394
18%
1486
21%
372
65%
372
24%
861
August1st to 10thNight
63%
432
18%
1496
17%
430
66%
430
28%
882
August11th to 20thNight
60%
710
15%
1774
8%
710
61%
710
27%
1242
August21st to endNight
59%
792
18%
1980
10%
792
61%
792
34%
1308
September1st to 10thNight
49%
720
22%
1800
11%
720
53%
720
32%
1221
September11th to 20thNight
53%
720
26%
1916
16%
720
58%
720
36%
1164
September21st to endNight
46%
720
23%
1980
16%
720
54%
720
28%
1316
October1st to 10thNight
36%
720
16%
2013
11%
720
42%
720
23%
1397
October11th to 20thNight
40%
720
24%
2160
13%
720
53%
720
28%
1327
October21st to endNight
27%
792
18%
2574
9%
792
39%
792
21%
1696
November1st to 10thNight
37%
740
23%
2407
13%
740
50%
740
26%
1441
November11th to 20thNight
28%
760
25%
2470
13%
760
43%
760
24%
1509
November21st to endNight
28%
760
23%
2493
10%
760
44%
760
24%
1509
December1st to 10thNight
26%
760
19%
2660
7%
760
41%
760
19%
1714
December11th to 20thNight
24%
760
19%
3183
6%
759
38%
759
15%
1962
December21st to endNight
21%
827
13%
4805
8%
817
37%
817
11%
3012

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%6%25%4345%5%7%42%
74797
Night
18%7%25%43445%6%42%
74965
TransparencyDay
39%7%13%23%16%2
74502
Night
42%5%12%23%16%2
74794
SeeingDay
18%6%26%29%17%4
13912
Night
20%8%30%29%12%2
23090

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
15%6%25%5%3446%5%45%
1517
11th to 20thDay
18%7%36%5%236%5%7%38%
1472
21st to endDay
15%6%35%425%5%5%8%43%
1650
February1st to 10thDay
18%7%245%35%5%5%7%37%
1678
11th to 20thDay
16%6%25%5%245%5%7%43%
1748
21st to endDay
22%8%245%3445%6%38%
1480
March1st to 10thDay
15%6%26%5%3445%7%43%
1797
11th to 20thDay
16%6%25%435%6%5%8%40%
1850
21st to endDay
20%6%36%444345%41%
2376
April1st to 10thDay
19%7%34435%46%7%40%
2160
11th to 20thDay
19%5%25%433447%43%
2134
21st to endDay
21%5%25%5%2445%6%40%
2242
May1st to 10thDay
24%7%24325%45%7%36%
2340
11th to 20thDay
19%5%35%42446%7%40%
2402
21st to endDay
16%5%25%4245%5%8%44%
2725
June1st to 10thDay
19%5%25%5%345%6%9%37%
2520
11th to 20thDay
16%5%35%435%5%6%9%39%
2520
21st to endDay
13%6%25%435%5%6%9%43%
2520
July1st to 10thDay
12%5%25%5%35%5%6%10%42%
2520
11th to 20thDay
12%5%245%35%5%7%9%43%
2520
21st to endDay
13%5%35%5%36%5%6%8%41%
2744
August1st to 10thDay
12%425%5%35%5%7%10%42%
2409
11th to 20thDay
13%5%25%5%345%7%9%43%
2126
21st to endDay
12%5%35%5%345%6%8%44%
2376
September1st to 10thDay
14%5%25%5%345%5%6%46%
2160
11th to 20thDay
13%424324446%53%
2043
21st to endDay
19%5%245%24447%43%
1980
October1st to 10thDay
22%6%345%2445%5%42%
1944
11th to 20thDay
16%5%2442446%8%47%
1799
21st to endDay
20%5%2442446%6%40%
1782
November1st to 10thDay
14%5%26%5%33346%49%
1671
11th to 20thDay
19%6%23323346%48%
1710
21st to endDay
16%6%25%32445%7%45%
1684
December1st to 10thDay
19%6%25%5%35%46%7%38%
1520
11th to 20thDay
23%5%24323347%45%
1906
21st to endDay
19%12%35%5%34446%34%
2772
January1st to 10thNight
16%6%25%323447%46%
2649
11th to 20thNight
21%7%24424446%40%
2577
21st to endNight
15%9%24333447%45%
2704
February1st to 10thNight
18%9%35%5%24445%40%
2281
11th to 20thNight
18%8%35%42445%7%41%
2098
21st to endNight
21%7%245%34445%42%
1776
March1st to 10thNight
18%6%2442445%7%45%
2150
11th to 20thNight
17%7%2443446%6%42%
2105
21st to endNight
18%7%34444446%43%
1980
April1st to 10thNight
19%5%37%5%245%5%6%39%
1800
11th to 20thNight
20%5%25%5%23346%43%
1775
21st to endNight
21%6%36%5%24445%42%
1716
May1st to 10thNight
23%7%35%5%345%5%6%35%
1620
11th to 20thNight
22%6%35%5%34447%37%
1505
21st to endNight
20%7%25%5%35%45%7%39%
1550
June1st to 10thNight
20%5%25%5%4445%6%40%
1440
11th to 20thNight
17%6%25%4345%6%9%41%
1440
21st to endNight
14%5%25%445%45%9%44%
1440
July1st to 10thNight
13%5%25%5%35%5%7%8%40%
1440
11th to 20thNight
13%5%35%6%35%6%6%10%39%
1440
21st to endNight
13%5%25%436%5%7%9%41%
1574
August1st to 10thNight
8%5%26%6%36%6%8%8%43%
1506
11th to 20thNight
11%6%36%5%5%6%6%6%8%37%
1774
21st to endNight
13%425%5%25%5%5%9%44%
1980
September1st to 10thNight
15%6%345%445%5%7%43%
1800
11th to 20thNight
15%5%13413346%53%
1916
21st to endNight
18%7%245%25%435%44%
1980
October1st to 10thNight
20%7%35%5%25%337%40%
2013
11th to 20thNight
16%5%25%424446%47%
2160
21st to endNight
22%7%2443345%6%40%
2574
November1st to 10thNight
13%5%26%42345%6%49%
2407
11th to 20thNight
20%7%24323346%47%
2470
21st to endNight
16%5%25%42445%7%46%
2493
December1st to 10thNight
21%6%25%43445%6%40%
2660
11th to 20thNight
21%6%24424446%42%
3288
21st to endNight
22%10%35%423445%37%
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
39%411%28%15%3
1518
11th to 20thDay
44%6%14%20%14%2
1472
21st to endDay
40%5%11%25%16%3
1650
February1st to 10thDay
45%5%13%21%14%2
1678
11th to 20thDay
39%5%11%25%16%3
1757
21st to endDay
46%5%10%20%16%3
1480
March1st to 10thDay
40%5%14%22%15%4
1800
11th to 20thDay
40%7%11%23%17%2
1850
21st to endDay
45%6%8%18%19%5%
2376
April1st to 10thDay
41%7%10%21%17%4
2160
11th to 20thDay
40%6%11%21%19%3
2134
21st to endDay
41%6%11%22%16%4
2242
May1st to 10thDay
45%8%9%21%14%3
2340
11th to 20thDay
41%6%12%20%18%3
2406
21st to endDay
37%9%17%22%14%2
2725
June1st to 10thDay
41%8%12%24%13%1
2520
11th to 20thDay
39%9%13%24%13%1
2520
21st to endDay
35%9%15%25%15%1
2520
July1st to 10thDay
34%10%14%23%18%2
2450
11th to 20thDay
33%8%15%27%14%2
2445
21st to endDay
36%8%13%22%18%3
2591
August1st to 10thDay
34%8%16%27%15%1
2395
11th to 20thDay
34%8%15%26%15%1
2126
21st to endDay
34%9%11%24%20%3
2376
September1st to 10thDay
36%7%14%22%19%2
2160
11th to 20thDay
31%6%11%24%26%2
2043
21st to endDay
40%7%9%22%19%3
1980
October1st to 10thDay
42%7%9%21%18%3
1944
11th to 20thDay
36%414%27%18%2
1799
21st to endDay
43%6%10%22%16%3
1782
November1st to 10thDay
37%414%21%21%2
1671
11th to 20thDay
39%411%22%22%3
1710
21st to endDay
39%315%28%13%3
1684
December1st to 10thDay
45%415%18%15%1
1520
11th to 20thDay
42%315%20%19%2
1906
21st to endDay
50%6%11%22%9%1
2772
January1st to 10thNight
40%412%25%17%4
2649
11th to 20thNight
46%5%13%23%11%2
2577
21st to endNight
40%411%24%19%3
2704
February1st to 10thNight
47%412%21%13%2
2281
11th to 20thNight
44%410%21%16%5%
2100
21st to endNight
45%48%23%16%4
1776
March1st to 10thNight
39%5%12%24%16%4
2160
11th to 20thNight
42%6%9%22%16%4
2106
21st to endNight
44%49%18%20%5%
1980
April1st to 10thNight
46%410%19%16%4
1800
11th to 20thNight
43%410%20%21%1
1775
21st to endNight
45%5%9%20%16%5%
1716
May1st to 10thNight
50%6%10%18%15%2
1620
11th to 20thNight
47%6%10%18%17%2
1506
21st to endNight
45%7%15%20%12%1
1551
June1st to 10thNight
45%6%10%20%17%2
1440
11th to 20thNight
41%7%14%26%11%1
1440
21st to endNight
37%8%14%27%14%1
1440
July1st to 10thNight
39%9%15%22%14%2
1400
11th to 20thNight
38%10%14%26%11%1
1392
21st to endNight
36%7%17%23%15%2
1486
August1st to 10thNight
33%9%17%24%15%2
1496
11th to 20thNight
42%9%13%25%11%1
1774
21st to endNight
36%8%13%22%20%2
1980
September1st to 10thNight
40%6%10%26%16%2
1800
11th to 20thNight
34%411%24%24%3
1916
21st to endNight
42%6%8%21%21%3
1980
October1st to 10thNight
47%6%10%21%14%3
2013
11th to 20thNight
38%412%28%16%1
2160
21st to endNight
46%412%21%16%1
2574
November1st to 10thNight
38%5%12%22%20%4
2407
11th to 20thNight
41%310%24%19%4
2470
21st to endNight
38%5%13%30%13%2
2493
December1st to 10thNight
46%413%21%14%1
2660
11th to 20thNight
44%413%19%18%2
3288
21st to endNight
48%5%11%23%12%1
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
19%13%34%24%8%1
180
11th to 20thDay
14%18%42%21%5%1
168
21st to endDay
21%6%40%23%7%2
206
February1st to 10thDay
25%10%39%21%5%
298
11th to 20thDay
19%10%43%24%3
416
21st to endDay
23%12%38%21%5%
346
March1st to 10thDay
15%10%40%29%6%
420
11th to 20thDay
16%6%45%25%7%1
420
21st to endDay
22%7%39%23%7%1
462
April1st to 10thDay
21%8%35%24%10%2
420
11th to 20thDay
18%9%32%28%11%1
412
21st to endDay
26%7%26%31%8%1
420
May1st to 10thDay
28%5%28%27%9%3
423
11th to 20thDay
19%427%32%16%2
447
21st to endDay
18%316%33%23%7%
485
June1st to 10thDay
19%218%34%22%6%
450
11th to 20thDay
16%419%37%21%4
450
21st to endDay
12%417%34%25%7%
450
July1st to 10thDay
14%311%33%29%10%
445
11th to 20thDay
11%5%8%31%35%10%
444
21st to endDay
11%315%39%28%5%
488
August1st to 10thDay
10%39%40%28%9%
446
11th to 20thDay
14%29%35%30%10%
439
21st to endDay
12%314%36%27%8%
495
September1st to 10thDay
17%318%28%24%10%
450
11th to 20thDay
14%420%29%23%10%
450
21st to endDay
18%5%22%29%20%5%
450
October1st to 10thDay
26%5%18%26%18%7%
450
11th to 20thDay
16%7%27%29%17%3
449
21st to endDay
25%8%29%25%12%1
396
November1st to 10thDay
14%8%25%32%17%4
365
11th to 20thDay
20%9%38%24%9%
370
21st to endDay
18%11%32%27%12%1
344
December1st to 10thDay
19%9%36%27%7%2
180
11th to 20thDay
26%11%34%24%6%
180
21st to endDay
23%6%39%21%9%3
198
January1st to 10thNight
19%14%38%23%5%
760
11th to 20thNight
25%11%36%23%4
737
21st to endNight
19%13%40%25%3
792
February1st to 10thNight
22%12%38%26%2
720
11th to 20thNight
23%9%43%23%2
703
21st to endNight
25%10%40%21%4
592
March1st to 10thNight
21%10%38%25%6%
720
11th to 20thNight
20%8%37%27%7%1
720
21st to endNight
21%6%38%27%7%1
792
April1st to 10thNight
22%7%33%31%7%1
720
11th to 20thNight
22%5%32%31%11%
711
21st to endNight
22%5%31%32%9%1
636
May1st to 10thNight
26%5%27%27%14%1
540
11th to 20thNight
22%431%32%11%1
444
21st to endNight
21%216%35%25%2
389
June1st to 10thNight
21%421%33%21%2
360
11th to 20thNight
19%314%44%20%1
360
21st to endNight
12%314%48%22%1
360
July1st to 10thNight
14%316%36%28%3
350
11th to 20thNight
12%410%42%29%3
348
21st to endNight
14%215%44%23%2
394
August1st to 10thNight
9%216%43%29%2
432
11th to 20thNight
14%312%38%28%5%
710
21st to endNight
13%415%34%29%6%
792
September1st to 10thNight
16%222%32%22%6%
720
11th to 20thNight
17%419%34%19%7%
720
21st to endNight
20%423%30%20%3
720
October1st to 10thNight
23%7%27%23%16%4
720
11th to 20thNight
18%9%28%32%11%1
720
21st to endNight
26%9%33%23%8%1
792
November1st to 10thNight
16%9%32%28%13%2
740
11th to 20thNight
23%12%34%23%8%1
760
21st to endNight
18%15%34%26%7%1
760
December1st to 10thNight
25%12%34%23%6%1
760
11th to 20thNight
23%13%35%25%4
760
21st to endNight
24%13%36%23%3
836
Page generated at 2024-01-11 22:33:50. Version ac07

Copyright 2024 Attilla Danko


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