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 2024-10-25.

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 Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(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

By Month

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 Forecast	Data Points
Cloud Cover	Day	16% 7% 2 6% 5% 4 4 4 5% 7% 38%	101267
	Night	17% 8% 3 6% 4 4 4 3 5% 7% 40%	97549
Transparency	Day	44% 6% 11% 22% 14% 2	101022
	Night	43% 5% 12% 23% 14% 2	97414
Seeing	Day	23% 18% 30% 19% 8% 2	14920
	Night	21% 16% 32% 23% 8% 1	24079

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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	15% 8% 3 6% 4 4 4 3 4 4 46%	2517
	11th to 20th	Day	15% 9% 4 9% 8% 5% 4 3 4 6% 33%	2520
	21st to end	Day	21% 11% 4 7% 4 4 4 3 4 4 32%	3067
February	1st to 10th	Day	17% 8% 3 7% 6% 3 4 4 5% 6% 37%	1710
	11th to 20th	Day	14% 9% 3 7% 4 4 4 4 4 6% 41%	1817
	21st to end	Day	19% 10% 2 7% 6% 3 4 3 4 5% 36%	1570
March	1st to 10th	Day	26% 9% 3 6% 4 3 3 3 4 4 35%	3116
	11th to 20th	Day	9% 6% 2 6% 5% 6% 6% 4 6% 8% 42%	3406
	21st to end	Day	21% 8% 2 5% 4 3 3 3 3 6% 42%	4092
April	1st to 10th	Day	17% 8% 3 7% 5% 4 4 3 5% 6% 37%	2280
	11th to 20th	Day	16% 7% 2 7% 4 4 5% 4 6% 6% 39%	2254
	21st to end	Day	17% 8% 2 6% 5% 4 4 4 6% 6% 38%	2280
May	1st to 10th	Day	28% 8% 2 6% 4 4 4 3 4 7% 29%	4149
	11th to 20th	Day	23% 9% 3 8% 5% 4 4 4 5% 6% 28%	4398
	21st to end	Day	13% 6% 2 5% 4 4 5% 4 7% 9% 42%	4837
June	1st to 10th	Day	15% 6% 2 6% 4 5% 5% 5% 7% 9% 35%	2660
	11th to 20th	Day	14% 7% 2 6% 6% 5% 5% 5% 6% 9% 34%	2660
	21st to end	Day	13% 7% 2 6% 6% 4 5% 3 7% 8% 39%	2660
July	1st to 10th	Day	9% 6% 2 8% 6% 6% 6% 5% 7% 11% 32%	4440
	11th to 20th	Day	11% 6% 2 6% 5% 5% 5% 4 8% 10% 38%	4440
	21st to end	Day	15% 9% 3 8% 5% 5% 5% 5% 7% 7% 31%	4814
August	1st to 10th	Day	21% 6% 2 6% 5% 4 5% 5% 6% 7% 31%	4156
	11th to 20th	Day	12% 7% 2 6% 4 4 4 4 6% 8% 41%	3730
	21st to end	Day	12% 6% 2 5% 4 4 4 4 5% 9% 46%	4180
September	1st to 10th	Day	15% 6% 2 6% 5% 4 4 4 5% 7% 43%	2280
	11th to 20th	Day	12% 6% 2 5% 4 4 3 3 4 7% 50%	2225
	21st to end	Day	19% 7% 3 7% 4 4 4 4 4 5% 39%	2090
October	1st to 10th	Day	19% 7% 2 6% 4 4 4 4 5% 7% 39%	1938
	11th to 20th	Day	16% 5% 2 6% 4 4 4 3 5% 7% 46%	1900
	21st to end	Day	20% 6% 2 5% 4 4 4 3 5% 6% 40%	1915
November	1st to 10th	Day	14% 8% 2 4 3 3 3 3 3 6% 51%	1671
	11th to 20th	Day	18% 6% 2 5% 3 4 4 4 5% 6% 45%	1710
	21st to end	Day	15% 7% 3 6% 4 4 4 4 5% 7% 41%	1587
December	1st to 10th	Day	19% 9% 3 7% 5% 3 4 3 5% 6% 36%	1520
	11th to 20th	Day	21% 6% 2 5% 4 4 4 4 5% 6% 39%	1906
	21st to end	Day	17% 10% 3 10% 6% 6% 5% 4 6% 6% 27%	2772
January	1st to 10th	Night	16% 8% 2 5% 4 4 4 3 6% 7% 42%	4429
	11th to 20th	Night	15% 10% 4 7% 5% 4 4 3 4 6% 38%	4440
	21st to end	Night	23% 11% 2 6% 4 3 3 3 5% 5% 34%	4587
February	1st to 10th	Night	16% 9% 3 6% 4 3 4 4 4 6% 40%	2470
	11th to 20th	Night	16% 8% 3 6% 5% 4 5% 4 4 5% 40%	2247
	21st to end	Night	18% 7% 3 6% 4 3 4 3 5% 6% 40%	1884
March	1st to 10th	Night	22% 12% 3 6% 4 3 3 3 4 5% 36%	3724
	11th to 20th	Night	11% 6% 2 6% 4 4 4 3 5% 7% 46%	3548
	21st to end	Night	16% 10% 3 6% 3 3 4 3 4 4 43%	3540
April	1st to 10th	Night	16% 7% 3 7% 5% 5% 4 4 6% 7% 35%	1900
	11th to 20th	Night	17% 7% 2 6% 5% 4 4 4 4 7% 39%	1875
	21st to end	Night	20% 6% 3 4 4 3 4 3 5% 7% 41%	1900
May	1st to 10th	Night	26% 9% 3 6% 4 3 4 4 5% 7% 29%	2817
	11th to 20th	Night	24% 10% 3 7% 4 3 4 3 5% 6% 31%	2495
	21st to end	Night	14% 6% 2 5% 4 4 4 5% 6% 9% 41%	2738
June	1st to 10th	Night	15% 6% 2 6% 4 3 5% 4 5% 8% 43%	1520
	11th to 20th	Night	12% 7% 2 6% 4 4 5% 4 6% 8% 41%	1520
	21st to end	Night	12% 3 2 5% 4 4 5% 4 7% 9% 44%	1520
July	1st to 10th	Night	9% 6% 2 7% 5% 5% 4 5% 8% 9% 39%	2520
	11th to 20th	Night	11% 7% 2 6% 4 4 5% 4 8% 11% 37%	2520
	21st to end	Night	16% 7% 3 5% 4 5% 5% 4 6% 7% 36%	2739
August	1st to 10th	Night	22% 7% 3 7% 4 4 5% 4 6% 8% 31%	2751
	11th to 20th	Night	14% 7% 3 7% 4 4 5% 3 5% 6% 40%	3084
	21st to end	Night	11% 5% 1 5% 3 3 4 3 6% 8% 50%	3476
September	1st to 10th	Night	15% 7% 3 6% 3 4 4 2 5% 6% 45%	1900
	11th to 20th	Night	12% 6% 2 6% 3 3 3 2 4 8% 52%	1954
	21st to end	Night	17% 7% 2 6% 3 4 4 2 5% 6% 44%	2090
October	1st to 10th	Night	19% 8% 2 6% 4 3 3 2 5% 6% 41%	2237
	11th to 20th	Night	16% 5% 2 6% 3 3 4 3 4 6% 48%	2280
	21st to end	Night	20% 8% 2 4 3 3 3 3 5% 6% 43%	2547
November	1st to 10th	Night	13% 6% 2 5% 3 3 4 3 5% 6% 51%	2407
	11th to 20th	Night	18% 7% 2 5% 3 3 3 3 4 5% 46%	2470
	21st to end	Night	14% 6% 2 6% 4 4 4 4 6% 7% 43%	2588
December	1st to 10th	Night	18% 8% 2 6% 5% 4 4 4 5% 6% 37%	2660
	11th to 20th	Night	18% 7% 2 5% 4 4 5% 4 6% 7% 38%	3288
	21st to end	Night	19% 10% 3 8% 5% 4 4 3 4 5% 35%	4884

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	42% 4 10% 31% 11% 2	2518
	11th to 20th	Day	50% 7% 9% 21% 11% 2	2520
	21st to end	Day	54% 5% 10% 20% 10% 2	3067
February	1st to 10th	Day	47% 5% 13% 22% 12% 2	1710
	11th to 20th	Day	44% 6% 9% 23% 15% 3	1826
	21st to end	Day	50% 5% 9% 21% 12% 3	1570
March	1st to 10th	Day	53% 4 9% 24% 9% 2	3119
	11th to 20th	Day	36% 8% 12% 30% 13% 2	3406
	21st to end	Day	45% 3 8% 15% 23% 5%	4092
April	1st to 10th	Day	47% 5% 9% 20% 15% 4	2280
	11th to 20th	Day	43% 5% 10% 22% 16% 3	2254
	21st to end	Day	44% 6% 9% 21% 16% 4	2280
May	1st to 10th	Day	55% 5% 11% 16% 11% 1	4163
	11th to 20th	Day	56% 5% 11% 18% 8% 1	4402
	21st to end	Day	36% 7% 12% 26% 17% 2	4837
June	1st to 10th	Day	43% 7% 14% 21% 14% 1	2660
	11th to 20th	Day	45% 7% 13% 23% 10% 2	2660
	21st to end	Day	41% 6% 14% 23% 15% 1	2660
July	1st to 10th	Day	44% 7% 13% 22% 13% 2	4370
	11th to 20th	Day	39% 7% 17% 24% 13% 1	4365
	21st to end	Day	49% 7% 10% 17% 15% 1	4661
August	1st to 10th	Day	49% 7% 13% 21% 9%	4142
	11th to 20th	Day	39% 6% 13% 29% 13% 1	3766
	21st to end	Day	35% 5% 11% 30% 18% 2	4180
September	1st to 10th	Day	39% 6% 11% 21% 19% 2	2280
	11th to 20th	Day	35% 4 10% 24% 25% 3	2225
	21st to end	Day	47% 5% 9% 18% 19% 2	2090
October	1st to 10th	Day	43% 6% 10% 22% 16% 3	1938
	11th to 20th	Day	38% 5% 11% 25% 19% 2	1900
	21st to end	Day	43% 6% 9% 22% 18% 2	1915
November	1st to 10th	Day	36% 4 11% 25% 20% 3	1671
	11th to 20th	Day	40% 5% 10% 23% 19% 3	1710
	21st to end	Day	41% 5% 12% 29% 11% 2	1587
December	1st to 10th	Day	48% 5% 14% 19% 13% 1	1520
	11th to 20th	Day	43% 7% 15% 23% 11% 1	1906
	21st to end	Day	53% 8% 10% 21% 8%	2772
January	1st to 10th	Night	40% 5% 10% 30% 11% 3	4429
	11th to 20th	Night	46% 6% 13% 24% 11% 2	4440
	21st to end	Night	52% 4 9% 22% 12% 2	4587
February	1st to 10th	Night	44% 5% 13% 24% 12% 2	2470
	11th to 20th	Night	45% 6% 9% 19% 17% 4	2249
	21st to end	Night	45% 4 8% 24% 16% 3	1884
March	1st to 10th	Night	51% 3 9% 23% 11% 2	3734
	11th to 20th	Night	36% 5% 14% 27% 16% 2	3549
	21st to end	Night	44% 4 7% 18% 21% 6%	3540
April	1st to 10th	Night	46% 6% 11% 20% 13% 3	1900
	11th to 20th	Night	44% 6% 9% 21% 19% 1	1875
	21st to end	Night	42% 6% 10% 22% 17% 4	1900
May	1st to 10th	Night	54% 5% 11% 18% 10% 1	2823
	11th to 20th	Night	53% 6% 14% 15% 10% 1	2496
	21st to end	Night	39% 7% 14% 25% 12% 2	2739
June	1st to 10th	Night	41% 5% 11% 24% 18% 2	1520
	11th to 20th	Night	40% 7% 15% 25% 12% 1	1520
	21st to end	Night	34% 9% 15% 26% 15% 1	1520
July	1st to 10th	Night	39% 9% 17% 19% 15% 2	2480
	11th to 20th	Night	40% 7% 15% 25% 12% 1	2472
	21st to end	Night	44% 6% 14% 16% 18% 2	2651
August	1st to 10th	Night	50% 8% 16% 17% 9% 1	2741
	11th to 20th	Night	43% 6% 12% 28% 10% 1	3114
	21st to end	Night	33% 5% 11% 32% 19% 1	3476
September	1st to 10th	Night	40% 5% 10% 24% 19% 1	1900
	11th to 20th	Night	34% 4 11% 23% 25% 3	1954
	21st to end	Night	41% 5% 8% 23% 21% 1	2090
October	1st to 10th	Night	44% 5% 10% 24% 15% 2	2237
	11th to 20th	Night	36% 5% 12% 28% 16% 2	2280
	21st to end	Night	42% 4 11% 26% 16% 2	2547
November	1st to 10th	Night	34% 6% 11% 24% 21% 4	2407
	11th to 20th	Night	41% 4 9% 24% 18% 4	2470
	21st to end	Night	38% 5% 13% 28% 13% 1	2588
December	1st to 10th	Night	46% 5% 12% 23% 12% 1	2660
	11th to 20th	Night	42% 5% 13% 21% 16% 3	3288
	21st to end	Night	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
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	29% 30% 29% 10% 1 1	180
	11th to 20th	Day	36% 30% 25% 8% 1	180
	21st to end	Day	24% 33% 30% 8% 5%	283
February	1st to 10th	Day	30% 32% 30% 7% 1	270
	11th to 20th	Day	30% 29% 33% 7%	425
	21st to end	Day	33% 24% 30% 10% 3	382
March	1st to 10th	Day	30% 23% 28% 15% 3	460
	11th to 20th	Day	28% 26% 31% 12% 3 1	460
	21st to end	Day	33% 22% 29% 11% 3 1	506
April	1st to 10th	Day	30% 24% 28% 13% 5%	460
	11th to 20th	Day	26% 23% 31% 12% 6% 1	452
	21st to end	Day	30% 18% 35% 13% 3 2	460
May	1st to 10th	Day	35% 19% 28% 13% 5% 1	463
	11th to 20th	Day	24% 18% 33% 17% 7% 1	487
	21st to end	Day	20% 11% 28% 29% 11% 2	529
June	1st to 10th	Day	19% 16% 31% 23% 9% 1	490
	11th to 20th	Day	19% 14% 29% 26% 11% 1	490
	21st to end	Day	15% 15% 33% 26% 9% 1	490
July	1st to 10th	Day	15% 8% 29% 27% 16% 5%	485
	11th to 20th	Day	12% 5% 30% 36% 15% 3	484
	21st to end	Day	16% 11% 32% 28% 11% 2	532
August	1st to 10th	Day	16% 7% 29% 29% 14% 5%	486
	11th to 20th	Day	15% 8% 29% 29% 15% 4	479
	21st to end	Day	13% 9% 31% 27% 15% 5%	539
September	1st to 10th	Day	21% 12% 25% 23% 13% 5%	490
	11th to 20th	Day	13% 9% 29% 24% 15% 9%	490
	21st to end	Day	24% 14% 28% 21% 9% 3	490
October	1st to 10th	Day	24% 12% 29% 19% 12% 4	490
	11th to 20th	Day	18% 20% 31% 21% 9% 1	490
	21st to end	Day	24% 20% 32% 16% 7% 1	458
November	1st to 10th	Day	20% 18% 30% 21% 9% 2	365
	11th to 20th	Day	26% 23% 29% 16% 5%	370
	21st to end	Day	25% 24% 34% 13% 3	247
December	1st to 10th	Day	29% 28% 28% 9% 5%	180
	11th to 20th	Day	36% 26% 26% 9% 3	180
	21st to end	Day	30% 24% 30% 12% 4 1	198
January	1st to 10th	Night	23% 25% 36% 14% 2	760
	11th to 20th	Night	28% 21% 31% 18% 2	760
	21st to end	Night	21% 25% 37% 15% 2	836
February	1st to 10th	Night	24% 22% 36% 16% 2	760
	11th to 20th	Night	25% 27% 37% 10% 1	743
	21st to end	Night	29% 22% 33% 14% 2	628
March	1st to 10th	Night	24% 24% 33% 15% 4	760
	11th to 20th	Night	23% 26% 32% 16% 3 1	760
	21st to end	Night	23% 22% 36% 14% 5%	836
April	1st to 10th	Night	23% 22% 35% 17% 3	760
	11th to 20th	Night	22% 19% 36% 18% 4	751
	21st to end	Night	23% 16% 36% 21% 4 1	760
May	1st to 10th	Night	26% 16% 33% 20% 6%	566
	11th to 20th	Night	20% 14% 37% 22% 6% 1	374
	21st to end	Night	17% 8% 29% 34% 12%	411
June	1st to 10th	Night	18% 10% 28% 33% 11% 1	380
	11th to 20th	Night	14% 7% 34% 35% 10%	380
	21st to end	Night	12% 7% 28% 42% 11%	380
July	1st to 10th	Night	11% 6% 28% 35% 18% 2	370
	11th to 20th	Night	12% 5% 25% 40% 17% 1	368
	21st to end	Night	15% 4 25% 41% 13% 1	416
August	1st to 10th	Night	13% 3 24% 38% 19% 3	519
	11th to 20th	Night	14% 5% 22% 36% 21% 2	737
	21st to end	Night	15% 5% 23% 37% 18% 1	836
September	1st to 10th	Night	18% 6% 27% 32% 16% 1	760
	11th to 20th	Night	15% 5% 27% 30% 19% 3	760
	21st to end	Night	21% 7% 27% 31% 13% 2	760
October	1st to 10th	Night	22% 11% 28% 25% 13% 2	760
	11th to 20th	Night	19% 15% 31% 27% 9%	760
	21st to end	Night	25% 17% 31% 20% 7%	812
November	1st to 10th	Night	18% 16% 32% 25% 8% 1	740
	11th to 20th	Night	24% 18% 31% 21% 6% 1	760
	21st to end	Night	18% 21% 36% 19% 5% 1	760
December	1st to 10th	Night	25% 20% 33% 18% 4	760
	11th to 20th	Night	23% 21% 36% 18% 3	760
	21st to end	Night	23% 23% 34% 18% 2	836

Page generated at 2024-10-22 20:21:05. Version ac07

Copyright © 2024 Attilla Danko.