Deer Path Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Deer Path Park clear sky chart from 2005-11-06 to 2024-01-10.

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
31%
23156
20%
74581
9%
23113
43%
23113
21%
47623

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
17%
760
23%
2647
7%
757
37%
757
18%
1599
January11th to 20thNight
20%
720
19%
2520
6%
720
37%
720
16%
1639
January21st to endNight
16%
792
23%
2574
6%
792
36%
792
19%
1582
February1st to 10thNight
18%
720
18%
2340
5%
720
34%
720
16%
1537
February11th to 20thNight
12%
703
20%
2128
4%
699
32%
699
15%
1417
February21st to endNight
14%
592
26%
1776
8%
592
36%
592
17%
1159
March1st to 10thNight
21%
720
22%
2160
8%
720
39%
720
21%
1352
March11th to 20thNight
20%
720
22%
2008
7%
720
34%
720
19%
1356
March21st to endNight
19%
792
22%
2034
5%
792
32%
792
23%
1395
April1st to 10thNight
19%
720
18%
1800
3%
720
28%
720
21%
1247
April11th to 20thNight
25%
711
18%
1775
5%
711
31%
711
25%
1218
April21st to endNight
26%
720
20%
1800
6%
720
34%
720
26%
1228
May1st to 10thNight
24%
561
15%
1641
6%
561
32%
561
17%
1169
May11th to 20thNight
27%
354
19%
1416
11%
354
40%
354
17%
900
May21st to endNight
45%
388
15%
1551
14%
388
52%
388
18%
966
June1st to 10thNight
39%
360
17%
1440
15%
360
51%
360
20%
875
June11th to 20thNight
45%
360
15%
1440
15%
360
54%
360
20%
885
June21st to endNight
53%
360
16%
1440
17%
360
60%
360
24%
843
July1st to 10thNight
51%
350
13%
1400
14%
350
56%
350
18%
874
July11th to 20thNight
53%
348
17%
1392
18%
348
58%
348
21%
837
July21st to endNight
53%
394
18%
1486
18%
372
60%
372
25%
854
August1st to 10thNight
58%
522
15%
1586
10%
520
61%
520
27%
1047
August11th to 20thNight
53%
697
15%
1761
9%
697
55%
697
27%
1244
August21st to endNight
54%
792
17%
1980
8%
792
56%
792
30%
1330
September1st to 10thNight
46%
720
20%
1800
9%
720
51%
720
29%
1241
September11th to 20thNight
52%
720
27%
1844
17%
720
57%
720
36%
1147
September21st to endNight
44%
720
25%
1980
16%
720
52%
720
28%
1296
October1st to 10thNight
38%
720
17%
2128
11%
720
45%
720
24%
1380
October11th to 20thNight
37%
720
23%
2160
13%
720
50%
720
28%
1321
October21st to endNight
27%
792
23%
2470
11%
792
42%
792
23%
1573
November1st to 10thNight
34%
740
25%
2407
12%
740
52%
740
28%
1381
November11th to 20thNight
27%
760
25%
2470
12%
760
44%
760
21%
1526
November21st to endNight
26%
760
22%
2584
9%
760
44%
760
22%
1536
December1st to 10thNight
20%
760
19%
2660
7%
760
36%
760
15%
1715
December11th to 20thNight
21%
760
19%
3197
6%
759
38%
759
14%
1942
December21st to endNight
21%
828
13%
4786
7%
817
36%
817
10%
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
16%6%35%5%35%5%5%7%40%
74721
Night
16%6%35%5%3445%7%42%
74942
TransparencyDay
43%6%12%21%16%3
74426
Night
42%6%11%22%16%3
74771
SeeingDay
23%14%29%21%10%3
13828
Night
21%12%31%26%9%1
23165

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
13%6%46%5%46%45%6%41%
1509
11th to 20thDay
15%7%37%7%46%6%5%7%34%
1440
21st to endDay
15%6%36%5%35%5%5%7%40%
1778
February1st to 10thDay
18%7%36%5%35%46%7%37%
1620
11th to 20thDay
17%6%36%6%35%45%5%40%
1717
21st to endDay
21%8%45%5%345%5%438%
1480
March1st to 10thDay
14%8%25%6%3445%6%44%
1797
11th to 20thDay
16%6%36%6%345%6%7%38%
1948
21st to endDay
21%6%35%43345%6%40%
2322
April1st to 10thDay
17%7%36%5%3445%6%40%
2160
11th to 20thDay
16%6%25%5%345%6%8%40%
2134
21st to endDay
17%6%35%6%4445%7%39%
2160
May1st to 10thDay
20%8%35%6%345%5%7%34%
2333
11th to 20thDay
20%5%25%5%35%5%6%7%36%
2478
21st to endDay
15%6%26%5%3446%8%40%
2725
June1st to 10thDay
15%5%25%5%45%6%7%8%38%
2520
11th to 20thDay
15%5%36%7%36%6%6%8%36%
2520
21st to endDay
13%5%26%6%45%5%6%8%41%
2520
July1st to 10thDay
10%6%36%6%46%6%6%8%38%
2520
11th to 20thDay
9%5%345%36%7%7%11%41%
2520
21st to endDay
11%6%36%6%46%6%6%9%36%
2744
August1st to 10thDay
11%5%26%5%5%7%5%8%9%36%
2335
11th to 20thDay
12%5%25%5%46%6%6%10%38%
2126
21st to endDay
15%5%26%5%35%5%6%7%41%
2376
September1st to 10thDay
15%5%25%5%345%5%7%42%
2160
11th to 20thDay
14%5%2333445%8%50%
2116
21st to endDay
18%5%25%7%35%446%41%
1980
October1st to 10thDay
20%6%25%42445%6%41%
1828
11th to 20thDay
16%5%25%5%34447%45%
1800
21st to endDay
20%7%3342345%8%41%
1884
November1st to 10thDay
14%6%34423346%52%
1671
11th to 20thDay
17%5%25%33446%5%46%
1710
21st to endDay
16%5%35%43445%7%45%
1592
December1st to 10thDay
19%8%35%5%35%448%37%
1520
11th to 20thDay
21%5%35%435%446%41%
1906
21st to endDay
18%7%37%7%46%5%5%7%31%
2772
January1st to 10thNight
15%7%25%43445%7%45%
2647
11th to 20thNight
19%7%25%5%345%5%8%38%
2520
21st to endNight
13%8%36%42445%6%44%
2574
February1st to 10thNight
17%8%45%5%3445%6%40%
2340
11th to 20thNight
17%7%36%5%3445%5%41%
2127
21st to endNight
19%8%245%34346%42%
1776
March1st to 10thNight
16%5%245%235%5%7%45%
2150
11th to 20thNight
18%7%25%5%345%45%43%
2007
21st to endNight
18%6%345%35%45%6%42%
2034
April1st to 10thNight
17%6%35%5%35%46%7%38%
1800
11th to 20thNight
16%7%26%5%4435%7%41%
1775
21st to endNight
20%5%2442345%7%43%
1800
May1st to 10thNight
22%8%36%5%25%45%6%35%
1641
11th to 20thNight
18%8%35%5%3445%6%40%
1415
21st to endNight
16%6%35%5%35%46%8%41%
1550
June1st to 10thNight
17%5%25%435%45%7%42%
1440
11th to 20thNight
14%5%35%5%35%5%7%9%40%
1440
21st to endNight
11%4245%35%6%6%9%45%
1440
July1st to 10thNight
10%6%26%6%46%6%7%10%38%
1440
11th to 20thNight
9%5%25%6%35%6%8%10%41%
1440
21st to endNight
10%5%35%435%6%7%11%43%
1574
August1st to 10thNight
10%6%35%5%45%5%7%9%41%
1596
11th to 20thNight
13%6%25%5%46%6%7%8%37%
1761
21st to endNight
14%5%35%5%45%47%9%41%
1980
September1st to 10thNight
16%6%35%435%45%6%43%
1800
11th to 20thNight
13%5%24433447%51%
1844
21st to endNight
18%5%245%3445%6%44%
1980
October1st to 10thNight
20%6%25%42435%7%42%
2128
11th to 20thNight
16%5%24423447%49%
2160
21st to endNight
20%7%34334335%45%
2470
November1st to 10thNight
13%6%24333445%53%
2407
11th to 20thNight
18%6%34324345%48%
2470
21st to endNight
14%5%35%42446%8%45%
2584
December1st to 10thNight
20%6%35%43445%6%39%
2660
11th to 20thNight
18%6%245%345%5%7%41%
3288
21st to endNight
19%8%36%5%34346%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
43%411%24%14%3
1510
11th to 20thDay
48%7%13%18%11%3
1440
21st to endDay
43%5%10%24%15%3
1778
February1st to 10thDay
46%5%13%22%12%2
1620
11th to 20thDay
46%5%8%23%14%3
1726
21st to endDay
50%311%21%12%3
1480
March1st to 10thDay
41%412%25%15%3
1800
11th to 20thDay
45%5%11%21%15%3
1948
21st to endDay
47%49%18%17%5%
2322
April1st to 10thDay
45%5%9%19%16%5%
2160
11th to 20thDay
41%413%20%18%4
2134
21st to endDay
45%5%9%19%17%5%
2160
May1st to 10thDay
49%6%8%17%17%3
2333
11th to 20thDay
46%6%11%20%15%2
2482
21st to endDay
42%7%13%21%15%2
2725
June1st to 10thDay
42%8%14%21%14%1
2520
11th to 20thDay
45%7%13%20%11%3
2520
21st to endDay
41%9%12%22%15%1
2520
July1st to 10thDay
42%9%11%20%15%2
2450
11th to 20thDay
35%8%15%24%15%3
2445
21st to endDay
43%7%12%19%17%3
2591
August1st to 10thDay
41%8%12%21%16%1
2321
11th to 20thDay
39%9%15%22%14%2
2126
21st to endDay
41%7%10%20%18%3
2376
September1st to 10thDay
40%7%11%19%19%3
2160
11th to 20thDay
34%5%11%22%24%4
2116
21st to endDay
44%5%9%17%21%3
1980
October1st to 10thDay
44%5%11%20%17%2
1828
11th to 20thDay
39%5%10%24%20%2
1800
21st to endDay
43%5%10%23%17%2
1884
November1st to 10thDay
35%412%24%21%3
1671
11th to 20thDay
39%411%22%21%3
1710
21st to endDay
39%413%29%12%3
1592
December1st to 10thDay
46%416%20%13%1
1520
11th to 20thDay
45%5%13%25%11%2
1906
21st to endDay
51%6%13%21%9%1
2772
January1st to 10thNight
40%410%26%16%4
2647
11th to 20thNight
46%6%14%23%11%2
2520
21st to endNight
40%5%9%24%18%3
2574
February1st to 10thNight
45%5%12%24%12%2
2340
11th to 20thNight
46%410%19%17%4
2129
21st to endNight
44%47%23%18%3
1776
March1st to 10thNight
39%5%12%24%16%4
2160
11th to 20thNight
44%5%8%21%18%3
2008
21st to endNight
44%5%10%17%20%5%
2034
April1st to 10thNight
44%5%11%20%16%5%
1800
11th to 20thNight
43%410%19%20%2
1775
21st to endNight
41%6%9%21%19%5%
1800
May1st to 10thNight
50%5%9%16%17%2
1641
11th to 20thNight
46%6%11%17%18%3
1416
21st to endNight
41%9%15%19%13%3
1551
June1st to 10thNight
41%7%10%22%18%2
1440
11th to 20thNight
40%9%13%24%13%2
1440
21st to endNight
34%10%15%26%15%1
1440
July1st to 10thNight
40%10%14%20%15%1
1400
11th to 20thNight
36%10%12%25%14%2
1392
21st to endNight
35%8%16%23%15%3
1486
August1st to 10thNight
37%10%15%21%15%2
1586
11th to 20thNight
41%10%15%20%13%2
1761
21st to endNight
39%7%13%19%20%2
1980
September1st to 10thNight
41%7%11%20%19%2
1800
11th to 20thNight
34%5%11%21%25%4
1844
21st to endNight
40%5%8%23%22%2
1980
October1st to 10thNight
43%412%23%15%2
2128
11th to 20thNight
36%6%12%28%16%2
2160
21st to endNight
43%49%26%17%2
2470
November1st to 10thNight
34%5%12%24%22%4
2407
11th to 20thNight
41%48%23%19%5%
2470
21st to endNight
38%5%13%28%15%2
2584
December1st to 10thNight
46%5%12%23%13%1
2660
11th to 20thNight
42%5%14%19%16%4
3288
21st to endNight
49%411%24%11%
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
29%22%32%14%21
178
11th to 20thDay
33%29%27%11%1
160
21st to endDay
25%28%31%12%4
262
February1st to 10thDay
35%26%30%7%3
240
11th to 20thDay
32%22%35%10%2
385
21st to endDay
34%22%27%15%2
346
March1st to 10thDay
30%21%30%16%3
420
11th to 20thDay
26%25%32%13%21
420
21st to endDay
30%23%30%11%6%1
462
April1st to 10thDay
29%20%31%13%6%1
420
11th to 20thDay
24%21%30%14%10%1
412
21st to endDay
30%20%30%16%22
420
May1st to 10thDay
32%18%29%14%6%2
423
11th to 20thDay
23%15%35%19%6%1
447
21st to endDay
22%8%24%26%16%3
485
June1st to 10thDay
17%13%32%23%13%2
450
11th to 20thDay
20%12%30%26%10%2
450
21st to endDay
18%8%34%26%12%2
450
July1st to 10thDay
12%7%25%29%20%6%
445
11th to 20thDay
9%5%25%34%21%5%
444
21st to endDay
16%5%32%30%13%5%
488
August1st to 10thDay
11%5%28%32%17%6%
446
11th to 20thDay
15%423%32%20%6%
439
21st to endDay
14%6%28%29%15%8%
495
September1st to 10thDay
18%9%26%25%15%7%
450
11th to 20thDay
16%6%28%25%15%10%
450
21st to endDay
21%13%27%22%12%5%
450
October1st to 10thDay
26%8%26%19%13%7%
450
11th to 20thDay
19%16%28%25%11%1
450
21st to endDay
25%15%32%17%10%1
446
November1st to 10thDay
21%12%30%22%12%3
365
11th to 20thDay
27%16%32%20%41
370
21st to endDay
20%17%40%17%6%
252
December1st to 10thDay
28%28%27%10%7%
180
11th to 20thDay
38%22%24%11%5%
180
21st to endDay
31%18%28%16%6%1
198
January1st to 10thNight
22%20%38%18%3
760
11th to 20thNight
26%16%34%21%3
720
21st to endNight
21%19%39%20%1
792
February1st to 10thNight
25%18%35%20%2
720
11th to 20thNight
25%21%38%15%1
703
21st to endNight
29%17%36%16%2
592
March1st to 10thNight
24%21%32%20%3
720
11th to 20thNight
25%18%34%19%3
720
21st to endNight
22%16%40%18%5%1
792
April1st to 10thNight
22%21%36%18%4
720
11th to 20thNight
22%13%36%22%6%
711
21st to endNight
22%14%34%24%5%
720
May1st to 10thNight
26%14%31%22%6%
561
11th to 20thNight
25%7%36%25%7%
354
21st to endNight
17%7%23%38%13%1
389
June1st to 10thNight
19%5%29%33%13%1
360
11th to 20thNight
14%5%31%39%11%
360
21st to endNight
10%228%48%11%1
360
July1st to 10thNight
11%326%39%19%2
350
11th to 20thNight
10%427%40%18%1
348
21st to endNight
11%325%44%15%1
394
August1st to 10thNight
14%118%44%20%2
522
11th to 20thNight
15%319%36%26%2
697
21st to endNight
17%320%39%20%2
792
September1st to 10thNight
17%425%34%17%2
720
11th to 20thNight
17%322%34%19%4
720
21st to endNight
20%6%25%31%17%1
720
October1st to 10thNight
22%9%25%26%16%2
720
11th to 20thNight
18%12%29%30%11%
720
21st to endNight
24%13%32%22%9%
792
November1st to 10thNight
16%11%34%27%11%1
740
11th to 20thNight
23%16%29%25%7%
760
21st to endNight
18%16%35%23%6%1
760
December1st to 10thNight
25%18%31%20%5%1
760
11th to 20thNight
22%15%36%23%4
760
21st to endNight
25%15%33%24%2
836
Page generated at 2024-01-07 10:06:57. Version ac07

Copyright 2024 Attilla Danko


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