Rickett's Glen State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rickett's Glen State Park clear sky chart from 2005-11-06 to 2024-01-11.

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
29%
23065
17%
74690
9%
23019
39%
23019
19%
49492

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%
760
17%
2649
4%
757
27%
757
12%
1772
January11th to 20thNight
18%
724
13%
2478
6%
724
28%
724
12%
1760
January21st to endNight
14%
792
18%
2574
5%
792
29%
792
14%
1743
February1st to 10thNight
13%
720
14%
2340
4%
720
25%
720
13%
1620
February11th to 20thNight
9%
703
15%
2221
2%
700
26%
700
12%
1563
February21st to endNight
12%
592
19%
1776
6%
592
28%
592
14%
1283
March1st to 10thNight
16%
720
19%
2101
7%
720
30%
720
18%
1389
March11th to 20thNight
18%
720
19%
1980
6%
720
31%
720
19%
1333
March21st to endNight
17%
792
19%
2093
4%
792
29%
792
18%
1454
April1st to 10thNight
18%
720
15%
1800
3%
720
25%
720
18%
1327
April11th to 20thNight
23%
711
17%
1775
5%
711
30%
711
25%
1226
April21st to endNight
25%
720
17%
1800
4%
720
31%
720
24%
1241
May1st to 10thNight
30%
487
17%
1567
9%
487
37%
487
19%
1065
May11th to 20thNight
30%
354
20%
1416
12%
354
44%
354
17%
878
May21st to endNight
43%
388
15%
1551
14%
388
50%
388
20%
942
June1st to 10thNight
46%
360
18%
1440
17%
360
57%
360
23%
845
June11th to 20thNight
43%
360
15%
1440
14%
360
53%
360
21%
847
June21st to endNight
50%
360
17%
1440
19%
360
58%
360
26%
812
July1st to 10thNight
55%
350
15%
1400
16%
350
60%
350
23%
825
July11th to 20thNight
57%
348
17%
1392
21%
348
61%
348
24%
781
July21st to endNight
53%
451
16%
1540
15%
426
59%
426
25%
907
August1st to 10thNight
57%
537
17%
1600
13%
534
60%
534
31%
990
August11th to 20thNight
54%
604
17%
1668
11%
604
57%
604
28%
1121
August21st to endNight
53%
792
19%
1980
10%
792
55%
792
33%
1304
September1st to 10thNight
45%
720
19%
1800
8%
720
51%
720
29%
1221
September11th to 20thNight
49%
720
28%
1800
17%
720
54%
720
36%
1137
September21st to endNight
42%
720
24%
2037
17%
720
50%
720
28%
1315
October1st to 10thNight
39%
720
17%
2160
12%
720
46%
720
24%
1392
October11th to 20thNight
31%
720
19%
2160
10%
720
43%
720
24%
1389
October21st to endNight
25%
792
18%
2411
10%
792
36%
792
20%
1647
November1st to 10thNight
30%
740
22%
2407
11%
740
45%
740
24%
1460
November11th to 20thNight
22%
760
20%
2524
10%
760
35%
760
17%
1663
November21st to endNight
21%
760
18%
2660
8%
760
36%
760
18%
1724
December1st to 10thNight
16%
760
13%
2660
5%
760
26%
760
11%
1892
December11th to 20thNight
18%
760
14%
3225
6%
759
29%
759
10%
2228
December21st to endNight
15%
828
9%
4825
4%
817
28%
817
7%
3396

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%8%47%6%45%5%5%7%33%
74703
Night
16%8%36%5%35%5%5%7%36%
74987
TransparencyDay
49%411%22%12%2
74412
Night
47%312%23%13%2
74812
SeeingDay
24%17%28%18%9%3
13665
Night
22%15%29%24%9%1
23074

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
12%11%7%8%7%5%5%5%5%7%28%
1517
11th to 20thDay
15%13%5%12%8%45%445%23%
1490
21st to endDay
12%12%6%12%10%4435%6%25%
1782
February1st to 10thDay
16%13%6%9%6%5%5%45%5%25%
1620
11th to 20thDay
14%11%5%8%8%45%5%6%7%29%
1627
21st to endDay
20%12%38%7%45%45%6%27%
1480
March1st to 10thDay
14%10%5%8%7%45%446%34%
1854
11th to 20thDay
15%10%48%7%445%5%6%31%
1980
21st to endDay
20%11%46%6%3445%6%32%
2262
April1st to 10thDay
16%12%5%6%6%34446%33%
2160
11th to 20thDay
18%9%36%5%35%5%5%6%36%
2134
21st to endDay
18%7%37%6%3445%7%35%
2160
May1st to 10thDay
20%9%36%6%45%5%5%7%31%
2406
11th to 20thDay
22%7%36%6%35%46%6%31%
2478
21st to endDay
17%6%246%45%47%8%37%
2725
June1st to 10thDay
16%6%36%7%46%5%6%8%34%
2520
11th to 20thDay
17%6%36%7%45%5%6%7%34%
2520
21st to endDay
15%6%35%5%35%5%7%9%37%
2520
July1st to 10thDay
12%6%36%7%46%6%6%9%35%
2520
11th to 20thDay
11%5%26%6%35%6%7%10%39%
2520
21st to endDay
13%6%36%6%47%5%6%7%36%
2684
August1st to 10thDay
13%6%26%7%5%6%7%6%9%34%
2327
11th to 20thDay
15%7%36%7%46%5%5%8%34%
2214
21st to endDay
17%6%36%5%45%5%7%8%34%
2376
September1st to 10thDay
18%6%25%5%345%5%7%40%
2160
11th to 20thDay
15%5%344335%5%6%46%
2160
21st to endDay
21%7%25%5%25%45%6%37%
1921
October1st to 10thDay
20%7%25%43446%8%37%
1800
11th to 20thDay
19%8%36%6%34447%35%
1800
21st to endDay
22%10%36%6%345%5%6%30%
1944
November1st to 10thDay
15%8%36%6%35%446%41%
1671
11th to 20thDay
17%10%48%6%3445%6%34%
1653
21st to endDay
18%10%46%7%445%5%7%32%
1520
December1st to 10thDay
19%13%5%8%6%5%6%45%425%
1520
11th to 20thDay
21%11%5%7%5%3445%6%29%
1906
21st to endDay
19%14%7%10%8%45%5%4420%
2772
January1st to 10thNight
13%11%48%7%45%5%6%7%31%
2649
11th to 20thNight
16%12%5%9%6%46%5%5%7%27%
2478
21st to endNight
11%9%5%10%7%45%6%6%7%30%
2574
February1st to 10thNight
17%10%47%6%45%5%5%7%30%
2340
11th to 20thNight
14%10%48%7%45%5%6%7%30%
2219
21st to endNight
16%12%48%7%35%5%46%31%
1776
March1st to 10thNight
15%8%47%5%35%6%6%7%35%
2091
11th to 20thNight
15%9%46%6%35%45%7%37%
1979
21st to endNight
15%10%35%7%35%45%6%37%
2093
April1st to 10thNight
16%11%5%8%6%35%5%47%31%
1800
11th to 20thNight
17%6%35%5%35%45%8%38%
1775
21st to endNight
19%7%25%5%335%6%6%39%
1800
May1st to 10thNight
22%8%36%5%24446%35%
1567
11th to 20thNight
18%6%246%45%5%6%6%39%
1415
21st to endNight
16%6%345%435%5%8%41%
1550
June1st to 10thNight
16%425%435%5%5%9%40%
1440
11th to 20thNight
16%425%6%35%47%9%39%
1440
21st to endNight
13%6%344245%7%9%43%
1440
July1st to 10thNight
11%5%25%5%35%5%6%9%42%
1440
11th to 20thNight
11%435%5%35%5%7%10%42%
1440
21st to endNight
12%5%35%6%445%6%8%43%
1631
August1st to 10thNight
12%5%245%35%5%8%10%41%
1611
11th to 20thNight
14%7%36%5%35%5%6%7%40%
1668
21st to endNight
14%5%25%435%5%5%8%44%
1980
September1st to 10thNight
17%5%345%35%5%5%7%42%
1800
11th to 20thNight
14%6%35%324346%50%
1800
21st to endNight
17%6%35%5%34446%43%
2037
October1st to 10thNight
21%9%24323437%42%
2160
11th to 20thNight
19%8%344235%45%42%
2160
21st to endNight
23%8%25%5%35%45%7%33%
2411
November1st to 10thNight
12%8%35%5%35%45%6%44%
2407
11th to 20thNight
19%8%36%5%35%45%6%36%
2524
21st to endNight
14%8%47%6%35%5%5%7%35%
2660
December1st to 10thNight
18%13%5%8%5%45%5%6%7%25%
2660
11th to 20thNight
19%11%5%8%6%35%5%46%29%
3288
21st to endNight
21%11%5%8%6%45%45%7%25%
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
55%310%22%9%1
1518
11th to 20thDay
61%411%15%8%1
1490
21st to endDay
59%39%19%10%1
1782
February1st to 10thDay
59%312%16%10%1
1620
11th to 20thDay
54%38%25%9%1
1636
21st to endDay
57%38%21%9%2
1480
March1st to 10thDay
52%211%22%11%2
1857
11th to 20thDay
52%39%22%12%2
1980
21st to endDay
54%28%18%15%3
2262
April1st to 10thDay
52%38%21%12%4
2160
11th to 20thDay
49%310%21%15%2
2134
21st to endDay
47%39%23%14%4
2160
May1st to 10thDay
52%39%20%12%3
2406
11th to 20thDay
51%39%21%13%2
2482
21st to endDay
43%6%15%22%13%2
2725
June1st to 10thDay
47%413%21%13%1
2520
11th to 20thDay
47%413%22%12%1
2520
21st to endDay
41%413%29%12%
2520
July1st to 10thDay
43%7%13%24%13%1
2450
11th to 20thDay
38%416%26%14%1
2445
21st to endDay
45%5%12%21%15%1
2534
August1st to 10thDay
45%5%13%24%13%
2314
11th to 20thDay
48%414%22%11%1
2214
21st to endDay
45%410%24%14%3
2376
September1st to 10thDay
43%5%11%24%15%2
2160
11th to 20thDay
38%310%25%21%2
2160
21st to endDay
46%410%21%18%2
1921
October1st to 10thDay
45%413%22%14%2
1800
11th to 20thDay
49%28%28%12%1
1800
21st to endDay
54%312%21%10%1
1944
November1st to 10thDay
42%313%24%16%3
1671
11th to 20thDay
50%310%21%14%2
1653
21st to endDay
50%314%24%8%1
1520
December1st to 10thDay
59%413%15%7%1
1520
11th to 20thDay
56%316%20%6%
1906
21st to endDay
68%29%15%5%
2772
January1st to 10thNight
51%211%23%11%2
2649
11th to 20thNight
55%414%18%7%1
2478
21st to endNight
51%311%22%12%1
2574
February1st to 10thNight
53%312%22%9%1
2340
11th to 20thNight
53%49%21%11%2
2221
21st to endNight
55%28%21%12%2
1776
March1st to 10thNight
46%313%25%10%3
2101
11th to 20thNight
47%212%24%13%2
1980
21st to endNight
49%310%18%17%3
2093
April1st to 10thNight
53%39%21%12%2
1800
11th to 20thNight
44%411%22%17%2
1775
21st to endNight
45%310%22%16%3
1800
May1st to 10thNight
51%38%24%11%3
1567
11th to 20thNight
45%5%11%21%16%2
1416
21st to endNight
43%5%16%20%13%2
1551
June1st to 10thNight
40%412%27%16%1
1440
11th to 20thNight
41%415%27%11%2
1440
21st to endNight
35%6%14%31%13%1
1440
July1st to 10thNight
39%6%13%26%14%2
1400
11th to 20thNight
36%6%16%26%14%2
1392
21st to endNight
36%7%17%23%15%2
1540
August1st to 10thNight
38%5%16%28%13%1
1600
11th to 20thNight
43%5%14%24%14%1
1668
21st to endNight
39%412%24%19%1
1980
September1st to 10thNight
42%5%10%26%15%2
1800
11th to 20thNight
36%310%27%21%2
1800
21st to endNight
42%29%25%20%1
2037
October1st to 10thNight
44%312%25%15%1
2160
11th to 20thNight
44%313%27%12%2
2160
21st to endNight
50%211%24%11%1
2411
November1st to 10thNight
40%313%24%18%2
2407
11th to 20thNight
48%311%22%13%3
2524
21st to endNight
47%314%25%10%1
2660
December1st to 10thNight
57%313%20%7%
2660
11th to 20thNight
55%312%19%10%1
3288
21st to endNight
60%212%22%4
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
30%24%33%9%31
180
11th to 20thDay
36%26%30%7%2
182
21st to endDay
27%31%27%12%3
264
February1st to 10thDay
35%31%27%6%1
240
11th to 20thDay
34%31%31%4
294
21st to endDay
36%25%28%10%1
346
March1st to 10thDay
32%24%28%13%3
420
11th to 20thDay
29%25%31%11%31
420
21st to endDay
31%26%25%12%42
462
April1st to 10thDay
30%26%26%12%5%1
420
11th to 20thDay
30%23%24%14%6%3
412
21st to endDay
27%22%33%12%5%2
420
May1st to 10thDay
29%21%29%10%9%2
423
11th to 20thDay
26%16%31%17%9%2
447
21st to endDay
23%10%28%20%17%4
485
June1st to 10thDay
20%14%32%22%10%2
450
11th to 20thDay
21%14%26%26%12%1
450
21st to endDay
17%12%34%26%11%1
450
July1st to 10thDay
14%8%26%29%19%4
445
11th to 20thDay
11%9%26%33%18%5%
444
21st to endDay
16%10%31%28%13%4
488
August1st to 10thDay
12%9%26%26%21%7%
446
11th to 20thDay
17%6%26%28%16%7%
439
21st to endDay
16%12%25%25%13%9%
495
September1st to 10thDay
21%10%24%20%18%7%
450
11th to 20thDay
14%8%28%24%17%9%
450
21st to endDay
24%12%24%22%13%4
450
October1st to 10thDay
27%11%21%23%14%4
450
11th to 20thDay
23%20%28%21%7%1
450
21st to endDay
29%18%28%19%5%1
477
November1st to 10thDay
24%18%27%21%10%1
365
11th to 20thDay
28%23%27%18%41
313
21st to endDay
29%24%35%9%3
180
December1st to 10thDay
33%28%25%7%6%1
180
11th to 20thDay
35%26%28%9%2
180
21st to endDay
30%28%30%10%2
198
January1st to 10thNight
22%24%38%14%3
760
11th to 20thNight
24%20%33%20%3
724
21st to endNight
18%26%37%18%2
792
February1st to 10thNight
26%22%34%16%2
720
11th to 20thNight
26%25%36%12%1
703
21st to endNight
29%21%35%14%2
592
March1st to 10thNight
25%22%34%16%2
720
11th to 20thNight
26%22%31%17%4
720
21st to endNight
24%22%33%16%5%1
792
April1st to 10thNight
24%22%32%18%4
720
11th to 20thNight
22%17%35%19%7%
711
21st to endNight
24%16%32%23%5%
720
May1st to 10thNight
28%13%24%24%10%
487
11th to 20thNight
21%11%31%31%6%1
354
21st to endNight
21%7%21%36%15%1
389
June1st to 10thNight
18%325%38%15%1
360
11th to 20thNight
18%6%26%37%13%
360
21st to endNight
12%329%44%11%
360
July1st to 10thNight
11%5%22%39%21%2
350
11th to 20thNight
10%6%19%43%21%1
348
21st to endNight
12%421%43%19%2
451
August1st to 10thNight
15%217%44%21%2
537
11th to 20thNight
14%316%36%27%3
604
21st to endNight
15%5%21%34%24%2
792
September1st to 10thNight
19%6%23%32%19%2
720
11th to 20thNight
16%6%23%26%23%5%
720
21st to endNight
20%9%22%30%17%2
720
October1st to 10thNight
26%8%22%26%16%2
720
11th to 20thNight
24%12%28%30%6%1
720
21st to endNight
26%14%32%23%5%
792
November1st to 10thNight
16%16%34%26%8%1
740
11th to 20thNight
24%18%30%22%5%1
760
21st to endNight
21%20%34%21%31
760
December1st to 10thNight
26%23%32%15%4
760
11th to 20thNight
23%20%33%20%3
760
21st to endNight
26%20%35%17%3
836
Page generated at 2024-01-08 11:14:20. Version ac07

Copyright 2024 Attilla Danko


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