Lake Hopatcong State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Hopatcong State Park clear sky chart from 2005-11-05 to 2017-08-12.

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
28%
14870
19%
46488
8%
14839
40%
14839
21%
29818

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 15thNight
18%
720
19%
2506
6%
716
35%
716
15%
1606
January16th to endNight
13%
768
20%
2574
3%
768
33%
768
16%
1632
February1st to 15thNight
10%
704
17%
2249
2%
701
28%
701
13%
1493
February16th to endNight
13%
631
26%
1893
6%
631
37%
631
17%
1200
March1st to 15thNight
17%
720
19%
2127
6%
720
32%
720
17%
1407
March16th to endNight
18%
768
22%
2010
6%
768
31%
768
22%
1331
April1st to 15thNight
18%
718
16%
1796
3%
718
25%
718
20%
1246
April16th to endNight
23%
720
17%
1800
4%
720
31%
720
24%
1235
May1st to 15thNight
24%
477
18%
1557
7%
477
36%
477
18%
1042
May16th to endNight
37%
374
15%
1497
11%
374
46%
374
19%
922
June1st to 15thNight
38%
360
14%
1440
11%
360
50%
360
18%
902
June16th to endNight
48%
360
15%
1440
14%
360
59%
360
25%
816
July1st to 15thNight
47%
340
12%
1360
13%
340
53%
340
20%
838
July16th to endNight
54%
376
15%
1418
16%
354
60%
354
25%
795
August1st to 15thNight
52%
545
18%
1594
11%
543
56%
543
32%
987
August16th to endNight
50%
700
18%
1750
9%
700
52%
700
31%
1174
September1st to 15thNight
45%
660
23%
1650
10%
660
51%
660
31%
1093
September16th to endNight
47%
657
26%
1791
18%
657
53%
657
34%
1110
October1st to 15thNight
34%
660
21%
1955
13%
660
44%
660
25%
1256
October16th to endNight
25%
704
22%
2181
8%
704
43%
704
23%
1353
November1st to 15thNight
28%
700
22%
2277
9%
700
46%
700
22%
1398
November16th to endNight
24%
720
20%
2415
9%
720
38%
720
18%
1538
December1st to 15thNight
19%
720
15%
2520
5%
720
32%
720
14%
1683
December16th to endNight
14%
768
19%
2688
3%
768
32%
768
14%
1761

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%25%5%35%45%7%38%
47486
Night
15%6%2442445%7%41%
46658
Cloud CoverDay
16%6%25%5%3445%7%38%
47495
Night
16%6%24424447%42%
46664
TransparencyDay
44%5%11%21%14%2
47174
Night
41%5%12%22%15%2
46488
SeeingDay
21%14%29%21%10%3
5596
Night
20%15%31%23%8%
14871

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 15thDay
15%6%26%7%4444440%
1432
16th to endDay
14%7%36%425%447%39%
1648
February1st to 15thDay
15%7%26%7%23446%37%
1610
16th to endDay
15%7%26%6%345%46%38%
1580
March1st to 15thDay
16%7%25%5%345%47%35%
1820
16th to endDay
18%6%24434346%40%
2214
April1st to 15thDay
17%7%25%423446%39%
2152
16th to endDay
15%6%25%5%2445%7%41%
2160
May1st to 15thDay
21%6%26%5%25%346%34%
2403
16th to endDay
17%7%25%435%5%5%8%35%
2618
June1st to 15thDay
17%6%245%36%6%5%9%31%
2520
16th to endDay
13%6%25%6%36%46%7%36%
2520
July1st to 15thDay
12%5%26%6%46%5%6%9%33%
2520
16th to endDay
11%5%26%5%36%5%7%9%36%
2654
August1st to 15thDay
13%5%25%6%36%7%6%6%36%
2255
16th to endDay
14%5%35%5%345%47%40%
2100
September1st to 15thDay
15%5%15%5%24446%44%
1980
16th to endDay
15%5%25%423335%45%
1838
October1st to 15thDay
17%6%145%24447%40%
1672
16th to endDay
19%5%13425%447%41%
1691
November1st to 15thDay
18%7%23323335%46%
1581
16th to endDay
17%5%25%32345%6%43%
1542
December1st to 15thDay
16%7%25%435%5%5%6%37%
1440
16th to endDay
19%8%35%42435%7%34%
1536
January1st to 15thNight
16%7%25%5%34447%40%
2506
16th to endNight
14%9%345%2435%6%40%
2574
February1st to 15thNight
13%8%36%5%245%46%38%
2248
16th to endNight
15%5%3442445%5%43%
1893
March1st to 15thNight
18%6%25%423446%40%
2114
16th to endNight
16%7%3331435%6%43%
2010
April1st to 15thNight
16%6%35%4345%5%8%37%
1796
16th to endNight
18%6%2442345%6%42%
1800
May1st to 15thNight
18%8%25%42445%6%37%
1557
16th to endNight
16%5%25%4235%5%6%41%
1495
June1st to 15thNight
18%5%245%25%45%6%39%
1440
16th to endNight
10%424425%5%6%9%45%
1440
July1st to 15thNight
11%4245%345%7%8%40%
1440
16th to endNight
10%3144346%8%9%42%
1514
August1st to 15thNight
10%5%134335%6%9%44%
1604
16th to endNight
13%425%43446%8%42%
1750
September1st to 15thNight
15%5%24333346%46%
1650
16th to endNight
13%5%25%323247%49%
1791
October1st to 15thNight
17%6%24423345%44%
1955
16th to endNight
19%5%2322235%6%45%
2181
November1st to 15thNight
16%7%23314345%47%
2277
16th to endNight
16%6%25%43445%6%40%
2415
December1st to 15thNight
19%6%35%5%35%447%34%
2520
16th to endNight
17%8%25%5%3435%7%37%
2688

Percentage Cloud Cover SE (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 15thDay
15%6%15%7%44445%39%
1432
16th to endDay
13%7%35%42445%7%40%
1648
February1st to 15thDay
15%8%26%7%24447%37%
1610
16th to endDay
15%6%35%5%3445%6%38%
1580
March1st to 15thDay
17%7%245%35%5%46%36%
1830
16th to endDay
18%6%24434346%41%
2213
April1st to 15thDay
18%7%25%42335%6%40%
2152
16th to endDay
16%5%245%2345%7%41%
2160
May1st to 15thDay
22%6%25%5%24446%34%
2403
16th to endDay
17%6%25%5%35%45%8%35%
2618
June1st to 15thDay
19%4245%36%6%5%9%32%
2520
16th to endDay
13%5%25%6%45%46%8%36%
2520
July1st to 15thDay
12%5%36%6%46%5%5%9%33%
2520
16th to endDay
11%5%26%5%36%5%7%9%36%
2654
August1st to 15thDay
13%5%26%6%36%6%6%7%36%
2255
16th to endDay
15%436%6%3445%6%39%
2100
September1st to 15thDay
15%5%25%424447%43%
1980
16th to endDay
15%435%433436%45%
1838
October1st to 15thDay
18%5%24433446%41%
1672
16th to endDay
19%5%13424447%42%
1691
November1st to 15thDay
19%6%23313345%45%
1581
16th to endDay
18%5%24324445%43%
1542
December1st to 15thDay
17%7%25%5%3445%6%37%
1440
16th to endDay
18%7%45%423449%34%
1536
January1st to 15thNight
17%6%245%24446%40%
2506
16th to endNight
15%9%34424346%40%
2574
February1st to 15thNight
13%8%45%5%3445%5%39%
2241
16th to endNight
15%5%34423445%45%
1893
March1st to 15thNight
18%7%24424446%41%
2127
16th to endNight
16%7%33223346%44%
2010
April1st to 15thNight
16%6%2443445%7%37%
1796
16th to endNight
18%6%24414446%42%
1800
May1st to 15thNight
18%8%35%424446%37%
1557
16th to endNight
18%42443445%7%41%
1495
June1st to 15thNight
18%5%24425%447%40%
1440
16th to endNight
10%5%234345%5%8%45%
1440
July1st to 15thNight
11%425%5%346%6%10%39%
1440
16th to endNight
10%413435%5%8%10%41%
1514
August1st to 15thNight
11%4243345%6%9%45%
1604
16th to endNight
13%5%35%6%2335%8%42%
1750
September1st to 15thNight
16%5%23324436%46%
1650
16th to endNight
13%435%323246%49%
1791
October1st to 15thNight
18%6%25%42334444%
1955
16th to endNight
19%5%23323346%45%
2181
November1st to 15thNight
16%6%24314345%47%
2277
16th to endNight
17%5%25%433446%40%
2415
December1st to 15thNight
19%6%26%4345%47%35%
2520
16th to endNight
17%8%245%24446%38%
2688

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 15thDay
46%411%23%10%2
1433
16th to endDay
43%5%12%23%12%2
1648
February1st to 15thDay
46%5%12%21%12%1
1613
16th to endDay
45%5%10%24%12%1
1580
March1st to 15thDay
47%5%13%21%10%1
1830
16th to endDay
44%49%20%17%3
2214
April1st to 15thDay
45%48%23%13%4
2152
16th to endDay
41%5%8%19%21%3
2160
May1st to 15thDay
50%48%19%14%2
2403
16th to endDay
45%6%13%19%13%1
2622
June1st to 15thDay
47%7%13%21%10%
2520
16th to endDay
44%6%12%22%12%1
2520
July1st to 15thDay
45%7%10%20%14%1
2371
16th to endDay
41%6%13%23%12%2
2487
August1st to 15thDay
43%7%12%19%15%
2241
16th to endDay
43%5%7%23%18%2
2100
September1st to 15thDay
39%6%11%19%22%1
1980
16th to endDay
41%38%20%23%3
1838
October1st to 15thDay
42%5%11%21%16%1
1672
16th to endDay
41%5%10%24%15%1
1691
November1st to 15thDay
41%312%20%18%2
1581
16th to endDay
41%311%27%14%2
1542
December1st to 15thDay
45%5%15%19%12%1
1440
16th to endDay
47%5%14%21%11%
1536
January1st to 15thNight
43%5%12%21%13%2
2506
16th to endNight
44%311%25%13%1
2574
February1st to 15thNight
45%6%12%20%13%2
2249
16th to endNight
40%48%25%17%3
1893
March1st to 15thNight
44%413%21%13%2
2127
16th to endNight
40%411%22%17%3
2010
April1st to 15thNight
43%5%11%21%15%2
1796
16th to endNight
42%5%8%20%20%2
1800
May1st to 15thNight
46%5%10%19%16%1
1557
16th to endNight
41%6%15%17%15%2
1497
June1st to 15thNight
44%5%13%20%15%
1440
16th to endNight
34%7%14%28%14%
1440
July1st to 15thNight
39%9%13%21%14%1
1360
16th to endNight
32%8%18%23%13%2
1418
August1st to 15thNight
32%8%15%25%15%2
1594
16th to endNight
40%5%10%22%19%2
1750
September1st to 15thNight
38%5%12%23%19%
1650
16th to endNight
36%37%23%26%2
1791
October1st to 15thNight
42%410%24%15%2
1955
16th to endNight
39%412%26%15%
2181
November1st to 15thNight
39%410%22%18%4
2277
16th to endNight
43%412%24%12%1
2415
December1st to 15thNight
47%5%15%19%11%
2520
16th to endNight
46%5%13%22%12%
2688

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 15thDay
28%30%30%8%3
60
16th to endDay
24%26%42%6%1
83
February1st to 15thDay
22%40%28%8%
127
16th to endDay
20%24%40%11%3
239
March1st to 15thDay
26%22%27%18%4
270
16th to endDay
22%22%34%13%41
288
April1st to 15thDay
23%19%32%16%7%
270
16th to endDay
22%13%36%17%7%2
270
May1st to 15thDay
37%15%24%14%6%1
288
16th to endDay
22%10%27%27%9%1
331
June1st to 15thDay
23%14%24%24%12%
315
16th to endDay
18%10%34%24%9%1
315
July1st to 15thDay
17%7%28%30%13%3
305
16th to endDay
17%5%23%30%19%3
326
August1st to 15thDay
17%5%21%30%16%7%
297
16th to endDay
14%421%27%22%9%
268
September1st to 15thDay
16%9%27%22%14%9%
255
16th to endDay
18%424%24%14%12%
254
October1st to 15thDay
20%8%28%23%14%3
255
16th to endDay
19%21%33%17%6%
259
November1st to 15thDay
22%15%28%22%9%1
235
16th to endDay
19%25%31%17%41
162
December1st to 15thDay
30%25%28%8%8%
60
16th to endDay
34%26%29%7%1
64
January1st to 15thNight
23%21%35%17%2
720
16th to endNight
22%24%37%15%1
768
February1st to 15thNight
21%24%39%13%1
704
16th to endNight
23%24%34%15%1
631
March1st to 15thNight
24%25%30%17%2
720
16th to endNight
20%22%35%15%5%
768
April1st to 15thNight
20%21%37%17%3
718
16th to endNight
21%15%35%21%5%
720
May1st to 15thNight
22%16%32%23%6%
477
16th to endNight
19%8%31%29%10%
375
June1st to 15thNight
19%8%28%31%11%
360
16th to endNight
10%6%27%45%9%
360
July1st to 15thNight
12%430%37%14%1
340
16th to endNight
12%323%40%17%2
376
August1st to 15thNight
13%225%36%20%2
545
16th to endNight
16%220%35%23%2
700
September1st to 15thNight
18%6%24%33%15%1
660
16th to endNight
17%326%28%21%2
657
October1st to 15thNight
20%11%29%25%12%
660
16th to endNight
22%18%31%21%5%
704
November1st to 15thNight
21%16%29%23%8%1
700
16th to endNight
20%19%32%20%6%
720
December1st to 15thNight
24%19%33%17%5%
720
16th to endNight
23%22%36%15%2
768
Page generated at 2017-08-13 14:16:56. Version ac04

Copyright 2017 A. Danko


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