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 2005-11-06 to 2024-02-25.

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%
23275
19%
80382
8%
23180
40%
23180
19%
51179

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
12%
756
23%
4340
5%
737
33%
737
10%
2418
January11th to 20thNight
18%
760
21%
4356
5%
740
35%
740
9%
2652
January21st to endNight
12%
832
14%
4540
5%
814
33%
814
9%
2996
February1st to 10thNight
13%
760
19%
2470
4%
760
31%
760
16%
1602
February11th to 20thNight
9%
743
20%
2249
3%
740
30%
740
14%
1513
February21st to endNight
13%
611
24%
1831
7%
611
34%
611
16%
1202
March1st to 10thNight
15%
720
21%
2160
7%
720
34%
720
19%
1358
March11th to 20thNight
17%
720
21%
2021
6%
720
32%
720
18%
1357
March21st to endNight
17%
792
22%
2026
5%
792
30%
792
21%
1381
April1st to 10thNight
16%
720
17%
1800
3%
720
25%
720
18%
1270
April11th to 20thNight
20%
711
18%
1775
4%
711
28%
711
22%
1228
April21st to endNight
22%
720
18%
1800
5%
720
30%
720
23%
1242
May1st to 10thNight
22%
537
15%
1617
6%
537
30%
537
16%
1158
May11th to 20thNight
24%
354
19%
1416
9%
354
39%
354
16%
891
May21st to endNight
41%
388
15%
1551
12%
388
50%
388
19%
953
June1st to 10thNight
39%
360
18%
1440
14%
360
52%
360
20%
863
June11th to 20thNight
38%
360
14%
1440
11%
360
49%
360
19%
888
June21st to endNight
48%
360
15%
1440
15%
360
57%
360
24%
815
July1st to 10thNight
48%
350
14%
1400
15%
350
54%
350
20%
857
July11th to 20thNight
51%
348
15%
1392
17%
348
56%
348
22%
824
July21st to endNight
52%
394
18%
1486
17%
372
59%
372
26%
825
August1st to 10thNight
52%
491
16%
1555
11%
489
57%
489
26%
983
August11th to 20thNight
48%
697
15%
1761
8%
697
50%
697
26%
1251
August21st to endNight
48%
792
18%
1980
8%
792
51%
792
30%
1329
September1st to 10thNight
42%
720
21%
1800
8%
720
48%
720
29%
1220
September11th to 20thNight
46%
720
27%
1851
16%
720
52%
720
36%
1149
September21st to endNight
41%
720
26%
1980
16%
720
51%
720
30%
1278
October1st to 10thNight
34%
720
17%
2119
10%
720
42%
720
23%
1412
October11th to 20thNight
32%
720
23%
2160
12%
720
46%
720
25%
1336
October21st to endNight
23%
792
22%
2488
10%
792
40%
792
21%
1596
November1st to 10thNight
30%
740
25%
2407
10%
740
49%
740
25%
1406
November11th to 20thNight
23%
760
26%
2470
11%
760
41%
760
20%
1531
November21st to endNight
22%
760
22%
2588
8%
760
40%
760
20%
1564
December1st to 10thNight
18%
760
18%
2660
6%
760
33%
760
15%
1743
December11th to 20thNight
17%
760
19%
3198
5%
759
34%
759
13%
1964
December21st to endNight
15%
827
12%
4815
4%
817
33%
817
8%
3124

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%7%36%6%35%5%5%7%38%
78352
Night
16%7%35%5%3445%7%41%
80932
TransparencyDay
44%6%11%22%14%2
78057
Night
43%6%12%23%15%2
80761
SeeingDay
23%18%30%19%8%2
13945
Night
21%16%32%23%8%1
23293

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%8%25%5%4444446%
2517
11th to 20thDay
16%8%48%9%45%446%33%
2520
21st to endDay
21%11%46%5%35%445%33%
3067
February1st to 10thDay
17%7%36%7%345%47%37%
1710
11th to 20thDay
14%8%37%5%345%46%41%
1817
21st to endDay
19%9%26%7%235%45%37%
1520
March1st to 10thDay
14%8%36%6%33446%42%
1797
11th to 20thDay
15%8%25%6%46%5%5%8%36%
1934
21st to endDay
20%8%25%444446%38%
2330
April1st to 10thDay
16%8%37%5%3445%6%38%
2160
11th to 20thDay
16%6%26%5%35%46%7%40%
2134
21st to endDay
18%8%25%6%345%5%6%37%
2160
May1st to 10thDay
23%8%26%5%35%45%6%33%
2355
11th to 20thDay
20%6%26%5%35%5%5%7%36%
2478
21st to endDay
15%7%35%435%5%6%8%39%
2725
June1st to 10thDay
16%6%35%5%45%6%6%9%35%
2520
11th to 20thDay
15%7%26%6%46%6%5%9%33%
2520
21st to endDay
13%7%25%6%35%46%8%39%
2520
July1st to 10thDay
11%6%26%7%46%6%6%9%36%
2520
11th to 20thDay
11%425%5%46%6%8%10%39%
2520
21st to endDay
12%7%36%6%36%5%7%8%37%
2744
August1st to 10thDay
12%6%26%6%47%7%7%7%36%
2364
11th to 20thDay
12%6%36%7%35%7%6%7%37%
2126
21st to endDay
14%6%35%5%446%5%8%40%
2376
September1st to 10thDay
16%5%25%5%35%45%7%42%
2160
11th to 20thDay
13%6%25%5%33447%50%
2108
21st to endDay
17%6%36%5%35%5%46%41%
1980
October1st to 10thDay
20%6%245%345%5%7%39%
1836
11th to 20thDay
17%6%25%5%35%45%7%44%
1800
21st to endDay
21%6%345%35%45%7%39%
1868
November1st to 10thDay
14%7%24323346%51%
1671
11th to 20thDay
18%5%244345%5%6%45%
1710
21st to endDay
16%6%35%5%3446%7%41%
1587
December1st to 10thDay
19%8%36%6%34447%36%
1520
11th to 20thDay
21%6%25%5%35%447%39%
1906
21st to endDay
17%10%48%8%46%5%6%6%27%
2772
January1st to 10thNight
16%7%245%3445%7%42%
4429
11th to 20thNight
15%10%46%6%34446%38%
4440
21st to endNight
23%11%35%5%3345%5%34%
4587
February1st to 10thNight
16%8%46%5%245%46%40%
2470
11th to 20thNight
16%8%45%6%35%5%46%40%
2247
21st to endNight
18%7%45%5%34446%40%
1831
March1st to 10thNight
16%6%25%5%2345%7%43%
2150
11th to 20thNight
18%7%35%435%446%41%
2020
21st to endNight
17%7%345%25%5%5%6%40%
2026
April1st to 10thNight
16%7%46%5%445%5%7%36%
1800
11th to 20thNight
17%7%25%6%35%45%7%39%
1775
21st to endNight
20%6%3443345%7%41%
1800
May1st to 10thNight
20%9%46%5%35%5%5%5%33%
1617
11th to 20thNight
17%7%26%6%245%5%6%39%
1415
21st to endNight
16%6%25%5%345%6%8%41%
1550
June1st to 10thNight
16%5%25%5%25%45%7%43%
1440
11th to 20thNight
13%7%35%6%35%5%6%8%40%
1440
21st to endNight
12%3345%45%5%6%9%45%
1440
July1st to 10thNight
11%5%35%6%445%8%9%40%
1440
11th to 20thNight
11%5%246%36%6%8%10%41%
1440
21st to endNight
11%424445%6%8%9%43%
1574
August1st to 10thNight
10%5%25%6%45%6%7%9%40%
1565
11th to 20thNight
11%8%36%6%45%6%6%8%36%
1761
21st to endNight
14%5%26%5%4446%8%42%
1980
September1st to 10thNight
16%6%36%43435%6%44%
1800
11th to 20thNight
13%6%35%323338%51%
1851
21st to endNight
16%6%25%325%25%7%46%
1980
October1st to 10thNight
19%8%25%42435%6%41%
2119
11th to 20thNight
17%5%25%424446%47%
2160
21st to endNight
20%7%3432345%6%42%
2488
November1st to 10thNight
13%6%2442445%6%51%
2407
11th to 20thNight
19%6%24423445%47%
2470
21st to endNight
14%5%25%5%3445%8%43%
2588
December1st to 10thNight
19%7%36%5%35%5%47%37%
2660
11th to 20thNight
18%7%24435%5%6%8%38%
3288
21st to endNight
19%10%37%6%34446%35%
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
42%410%31%11%2
2518
11th to 20thDay
50%7%9%21%11%2
2520
21st to endDay
54%5%10%20%10%2
3067
February1st to 10thDay
47%5%13%22%12%2
1710
11th to 20thDay
44%6%9%23%15%3
1826
21st to endDay
49%49%21%13%4
1520
March1st to 10thDay
43%412%25%14%3
1800
11th to 20thDay
44%6%11%22%15%2
1934
21st to endDay
47%5%8%18%17%5%
2330
April1st to 10thDay
46%5%9%21%15%5%
2160
11th to 20thDay
43%5%10%22%16%3
2134
21st to endDay
45%6%9%20%15%4
2160
May1st to 10thDay
51%5%8%19%15%3
2355
11th to 20thDay
47%6%10%21%14%3
2482
21st to endDay
42%7%14%21%14%2
2725
June1st to 10thDay
43%7%14%21%13%1
2520
11th to 20thDay
46%7%12%22%10%2
2520
21st to endDay
41%7%13%24%15%1
2520
July1st to 10thDay
44%6%11%22%15%1
2450
11th to 20thDay
36%8%16%24%14%2
2445
21st to endDay
43%7%11%20%16%2
2591
August1st to 10thDay
42%9%13%22%14%1
2350
11th to 20thDay
42%8%13%24%12%1
2126
21st to endDay
41%6%10%21%18%3
2376
September1st to 10thDay
40%7%12%21%18%2
2160
11th to 20thDay
36%410%23%25%3
2108
21st to endDay
45%5%9%18%20%3
1980
October1st to 10thDay
44%7%10%21%16%2
1836
11th to 20thDay
40%5%10%25%18%1
1800
21st to endDay
44%6%9%22%16%2
1868
November1st to 10thDay
36%411%25%20%3
1671
11th to 20thDay
40%5%10%23%19%3
1710
21st to endDay
41%5%12%29%11%2
1587
December1st to 10thDay
48%5%14%19%13%1
1520
11th to 20thDay
43%7%15%23%11%1
1906
21st to endDay
53%8%10%21%8%
2772
January1st to 10thNight
40%5%10%30%11%3
4429
11th to 20thNight
46%6%13%24%11%2
4440
21st to endNight
52%49%22%12%2
4587
February1st to 10thNight
44%5%13%24%12%2
2470
11th to 20thNight
45%6%9%19%17%4
2249
21st to endNight
44%47%25%17%3
1831
March1st to 10thNight
41%413%25%14%4
2160
11th to 20thNight
44%5%10%22%17%3
2021
21st to endNight
42%5%10%19%18%5%
2026
April1st to 10thNight
46%6%11%21%14%3
1800
11th to 20thNight
44%6%9%21%19%1
1775
21st to endNight
43%6%10%21%16%4
1800
May1st to 10thNight
51%6%9%18%15%2
1617
11th to 20thNight
45%6%11%18%18%3
1416
21st to endNight
41%7%16%20%12%3
1551
June1st to 10thNight
42%5%12%23%18%2
1440
11th to 20thNight
41%8%14%24%12%1
1440
21st to endNight
33%9%16%26%15%1
1440
July1st to 10thNight
39%9%14%21%15%2
1400
11th to 20thNight
37%9%16%26%12%1
1392
21st to endNight
32%8%18%23%16%2
1486
August1st to 10thNight
37%9%15%22%15%2
1555
11th to 20thNight
43%9%14%23%11%1
1761
21st to endNight
40%6%12%20%20%2
1980
September1st to 10thNight
42%5%11%24%17%1
1800
11th to 20thNight
35%410%23%25%3
1851
21st to endNight
39%5%8%24%22%1
1980
October1st to 10thNight
45%5%10%24%14%2
2119
11th to 20thNight
38%5%12%28%15%2
2160
21st to endNight
43%411%26%15%1
2488
November1st to 10thNight
34%6%11%24%21%4
2407
11th to 20thNight
41%49%24%18%4
2470
21st to endNight
38%5%13%28%13%1
2588
December1st to 10thNight
46%5%12%23%12%1
2660
11th to 20thNight
42%5%13%21%16%3
3288
21st to endNight
50%6%12%22%10%
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%30%29%10%11
180
11th to 20thDay
36%30%25%8%1
180
21st to endDay
24%33%30%8%5%
283
February1st to 10thDay
30%32%30%7%1
270
11th to 20thDay
30%29%33%7%
425
21st to endDay
33%24%30%10%2
362
March1st to 10thDay
29%24%30%14%3
420
11th to 20thDay
27%26%32%11%31
420
21st to endDay
33%22%30%10%31
462
April1st to 10thDay
29%25%28%13%6%
420
11th to 20thDay
25%23%31%13%7%1
412
21st to endDay
32%19%34%12%22
420
May1st to 10thDay
34%18%28%13%5%1
423
11th to 20thDay
24%18%34%17%6%1
447
21st to endDay
21%11%27%29%11%2
485
June1st to 10thDay
19%16%32%23%9%1
450
11th to 20thDay
21%15%29%24%10%1
450
21st to endDay
14%15%32%27%10%1
450
July1st to 10thDay
15%8%28%27%17%5%
445
11th to 20thDay
12%5%28%36%16%3
444
21st to endDay
17%10%31%28%11%2
488
August1st to 10thDay
13%7%28%31%15%6%
446
11th to 20thDay
15%7%28%29%15%4
439
21st to endDay
13%9%31%26%15%5%
495
September1st to 10thDay
21%11%26%24%13%5%
450
11th to 20thDay
14%10%31%22%14%9%
450
21st to endDay
22%14%29%21%10%4
450
October1st to 10thDay
26%11%28%19%12%4
450
11th to 20thDay
18%20%31%22%9%1
450
21st to endDay
25%21%32%15%6%1
439
November1st to 10thDay
20%18%30%21%9%2
365
11th to 20thDay
26%23%29%16%5%
370
21st to endDay
25%24%34%13%3
247
December1st to 10thDay
29%28%28%9%5%
180
11th to 20thDay
36%26%26%9%3
180
21st to endDay
30%24%30%12%41
198
January1st to 10thNight
23%25%36%14%2
760
11th to 20thNight
28%21%31%18%2
760
21st to endNight
21%25%37%15%2
836
February1st to 10thNight
24%22%36%16%2
760
11th to 20thNight
25%27%37%10%1
743
21st to endNight
28%23%33%14%2
611
March1st to 10thNight
24%24%33%16%3
720
11th to 20thNight
24%24%33%16%31
720
21st to endNight
22%22%37%14%5%
792
April1st to 10thNight
23%23%34%16%4
720
11th to 20thNight
22%19%36%19%4
711
21st to endNight
24%16%35%21%41
720
May1st to 10thNight
25%16%33%20%6%
537
11th to 20thNight
20%14%37%21%6%
354
21st to endNight
17%8%28%34%13%
389
June1st to 10thNight
19%9%29%32%11%1
360
11th to 20thNight
15%7%34%34%10%
360
21st to endNight
12%6%27%43%11%
360
July1st to 10thNight
11%6%29%33%19%2
350
11th to 20thNight
11%5%25%41%17%1
348
21st to endNight
14%425%41%13%2
394
August1st to 10thNight
12%225%39%19%3
491
11th to 20thNight
14%422%36%22%2
697
21st to endNight
15%5%23%38%18%1
792
September1st to 10thNight
18%6%27%33%15%2
720
11th to 20thNight
16%5%28%29%19%3
720
21st to endNight
20%7%27%31%13%2
720
October1st to 10thNight
22%11%28%25%13%2
720
11th to 20thNight
19%15%30%28%8%
720
21st to endNight
25%17%31%20%6%
792
November1st to 10thNight
18%16%32%25%8%1
740
11th to 20thNight
24%18%31%21%6%1
760
21st to endNight
18%21%36%19%5%1
760
December1st to 10thNight
25%20%33%18%4
760
11th to 20thNight
23%21%36%18%3
760
21st to endNight
23%23%34%18%2
836
Page generated at 2024-02-22 06:05:43. Version ac07

Copyright 2024 Attilla Danko


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