Lake Harris Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Harris Campground clear sky chart from 2005-11-06 to 2024-08-30.

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	17% 12% 4 9% 6% 5% 5% 4 5% 6% 27%	95793
	Night	17% 13% 5% 11% 6% 5% 4 4 5% 6% 26%	93244
Transparency	Day	55% 7% 11% 17% 9% 1	95512
	Night	57% 6% 12% 16% 8% 1	93079
Seeing	Day	26% 18% 27% 18% 9% 3	14438
	Night	24% 17% 25% 24% 9% 1	23441

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	12% 18% 9% 16% 7% 4 4 2 4 4 18%	2517
	11th to 20th	Day	14% 16% 6% 18% 12% 6% 4 3 3 4 14%	2520
	21st to end	Day	14% 17% 11% 14% 6% 5% 6% 4 4 5% 15%	2818
February	1st to 10th	Day	13% 17% 6% 13% 9% 5% 4 5% 5% 5% 18%	1710
	11th to 20th	Day	11% 13% 8% 16% 9% 5% 4 4 5% 4 20%	1774
	21st to end	Day	16% 17% 5% 13% 6% 5% 4 3 4 6% 21%	1570
March	1st to 10th	Day	20% 18% 6% 12% 6% 4 3 3 4 4 20%	3116
	11th to 20th	Day	11% 18% 9% 15% 6% 4 5% 3 4 4 22%	3320
	21st to end	Day	15% 13% 4 10% 7% 4 3 2 3 4 33%	4133
April	1st to 10th	Day	20% 15% 5% 8% 5% 4 4 3 4 5% 28%	2280
	11th to 20th	Day	18% 14% 4 8% 4 5% 4 3 4 5% 32%	2254
	21st to end	Day	21% 13% 4 10% 4 4 5% 3 4 5% 27%	2380
May	1st to 10th	Day	24% 12% 3 7% 5% 4 4 3 5% 6% 26%	4316
	11th to 20th	Day	19% 10% 3 8% 5% 5% 6% 4 5% 7% 28%	4398
	21st to end	Day	15% 8% 3 7% 5% 5% 5% 4 6% 8% 34%	4837
June	1st to 10th	Day	20% 8% 3 8% 7% 6% 5% 4 6% 7% 26%	2660
	11th to 20th	Day	18% 8% 3 7% 6% 5% 5% 6% 7% 8% 29%	2660
	21st to end	Day	21% 9% 3 8% 5% 5% 5% 4 6% 7% 26%	2660
July	1st to 10th	Day	14% 6% 3 7% 5% 5% 6% 5% 7% 10% 33%	4440
	11th to 20th	Day	13% 8% 3 7% 5% 5% 6% 5% 8% 10% 31%	4440
	21st to end	Day	15% 7% 3 7% 6% 5% 6% 5% 7% 8% 32%	4814
August	1st to 10th	Day	15% 8% 3 8% 6% 5% 6% 5% 8% 7% 30%	2646
	11th to 20th	Day	16% 7% 3 9% 5% 5% 6% 4 7% 9% 29%	2311
	21st to end	Day	15% 6% 4 7% 6% 5% 5% 5% 7% 8% 33%	2486
September	1st to 10th	Day	17% 6% 2 6% 5% 5% 4 4 5% 7% 38%	2160
	11th to 20th	Day	17% 6% 2 5% 4 3 4 4 5% 7% 43%	2095
	21st to end	Day	20% 7% 2 6% 3 5% 4 4 6% 7% 36%	1980
October	1st to 10th	Day	25% 12% 3 6% 5% 5% 3 3 3 5% 29%	1848
	11th to 20th	Day	19% 14% 3 7% 3 6% 4 4 6% 6% 28%	1800
	21st to end	Day	25% 15% 5% 9% 4 5% 4 2 5% 5% 21%	1785
November	1st to 10th	Day	15% 14% 4 9% 6% 5% 5% 3 5% 5% 28%	1671
	11th to 20th	Day	17% 15% 7% 9% 6% 4 4 4 4 5% 25%	1676
	21st to end	Day	17% 17% 6% 11% 7% 4 5% 3 4 5% 21%	1520
December	1st to 10th	Day	20% 21% 8% 12% 8% 4 3 3 3 4 14%	1520
	11th to 20th	Day	20% 16% 6% 13% 6% 4 4 3 4 6% 19%	1906
	21st to end	Day	20% 17% 7% 15% 6% 4 3 3 4 5% 16%	2772
January	1st to 10th	Night	15% 16% 8% 18% 6% 4 4 4 4 4 17%	4429
	11th to 20th	Night	11% 16% 8% 20% 12% 6% 5% 4 4 3 11%	4440
	21st to end	Night	16% 18% 7% 16% 6% 6% 6% 3 3 4 16%	4824
February	1st to 10th	Night	13% 16% 5% 15% 10% 7% 6% 4 5% 4 16%	2470
	11th to 20th	Night	11% 12% 5% 15% 10% 7% 5% 4 5% 6% 19%	2291
	21st to end	Night	13% 14% 6% 13% 7% 6% 5% 4 5% 6% 21%	1884
March	1st to 10th	Night	20% 16% 4 8% 8% 5% 5% 3 4 5% 23%	3724
	11th to 20th	Night	13% 16% 8% 13% 5% 4 3 3 3 5% 27%	3621
	21st to end	Night	15% 13% 5% 10% 6% 5% 3 3 3 4 31%	3498
April	1st to 10th	Night	20% 11% 5% 9% 6% 4 5% 4 4 5% 27%	1900
	11th to 20th	Night	19% 13% 4 8% 5% 4 4 3 5% 5% 29%	1875
	21st to end	Night	19% 10% 5% 9% 5% 4 4 3 5% 6% 31%	1800
May	1st to 10th	Night	23% 12% 3 9% 4 5% 4 3 5% 6% 26%	2654
	11th to 20th	Night	23% 13% 3 8% 4 4 4 3 4 5% 30%	2495
	21st to end	Night	14% 8% 3 7% 4 4 5% 4 6% 7% 36%	2738
June	1st to 10th	Night	20% 8% 2 7% 5% 4 4 4 5% 8% 34%	1520
	11th to 20th	Night	18% 7% 2 6% 5% 4 4 4 6% 8% 37%	1520
	21st to end	Night	19% 8% 2 6% 5% 5% 5% 4 7% 7% 33%	1520
July	1st to 10th	Night	13% 6% 3 7% 6% 6% 6% 4 6% 7% 37%	2520
	11th to 20th	Night	14% 8% 3 7% 4 4 5% 3 5% 8% 39%	2520
	21st to end	Night	11% 8% 3 6% 5% 4 4 4 6% 9% 39%	2739
August	1st to 10th	Night	14% 6% 2 7% 4 4 4 3 5% 7% 43%	1512
	11th to 20th	Night	16% 8% 3 7% 4 4 4 4 6% 7% 37%	1786
	21st to end	Night	14% 6% 2 6% 4 5% 4 5% 6% 8% 41%	2080
September	1st to 10th	Night	14% 7% 3 6% 4 3 5% 4 4 8% 42%	1800
	11th to 20th	Night	14% 7% 2 6% 3 4 3 3 5% 7% 45%	1863
	21st to end	Night	18% 8% 2 5% 4 3 4 3 5% 7% 40%	1980
October	1st to 10th	Night	22% 11% 4 7% 5% 4 4 3 5% 6% 29%	2110
	11th to 20th	Night	18% 13% 3 8% 5% 5% 4 4 5% 7% 28%	2160
	21st to end	Night	22% 15% 5% 9% 6% 5% 5% 4 4 5% 20%	2569
November	1st to 10th	Night	14% 14% 5% 11% 5% 4 5% 4 6% 6% 27%	2407
	11th to 20th	Night	18% 14% 5% 10% 5% 4 5% 4 4 5% 26%	2503
	21st to end	Night	17% 16% 6% 13% 6% 5% 4 4 6% 5% 19%	2660
December	1st to 10th	Night	19% 19% 8% 13% 7% 4 4 4 4 4 12%	2660
	11th to 20th	Night	20% 16% 5% 13% 7% 4 4 3 5% 5% 19%	3288
	21st to end	Night	22% 18% 5% 16% 5% 4 4 3 4 5% 14%	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	67% 5% 11% 13% 4	2518
	11th to 20th	Day	74% 4 8% 8% 4 2	2520
	21st to end	Day	69% 5% 11% 9% 4 2	2818
February	1st to 10th	Day	65% 5% 10% 14% 4 2	1710
	11th to 20th	Day	65% 5% 9% 12% 8% 1	1783
	21st to end	Day	63% 5% 10% 11% 9% 1	1570
March	1st to 10th	Day	65% 7% 8% 9% 9% 1	3119
	11th to 20th	Day	65% 5% 10% 11% 8% 2	3320
	21st to end	Day	53% 6% 7% 15% 17% 2	4133
April	1st to 10th	Day	58% 3 10% 16% 11% 2	2280
	11th to 20th	Day	54% 5% 8% 19% 13% 1	2254
	21st to end	Day	59% 5% 9% 13% 11% 3	2380
May	1st to 10th	Day	56% 8% 9% 19% 8% 1	4330
	11th to 20th	Day	53% 9% 12% 18% 7% 1	4402
	21st to end	Day	44% 8% 13% 24% 10% 1	4837
June	1st to 10th	Day	55% 8% 12% 15% 9% 1	2660
	11th to 20th	Day	50% 8% 12% 20% 10% 1	2660
	21st to end	Day	55% 8% 12% 17% 8% 1	2660
July	1st to 10th	Day	41% 9% 16% 23% 10%	4370
	11th to 20th	Day	41% 10% 17% 26% 6%	4365
	21st to end	Day	45% 9% 13% 26% 7%	4661
August	1st to 10th	Day	48% 9% 15% 19% 9%	2632
	11th to 20th	Day	46% 9% 16% 21% 8%	2311
	21st to end	Day	44% 8% 13% 25% 9% 1	2486
September	1st to 10th	Day	44% 6% 11% 27% 11% 1	2160
	11th to 20th	Day	40% 5% 11% 27% 16% 1	2095
	21st to end	Day	47% 6% 13% 22% 12% 1	1980
October	1st to 10th	Day	58% 5% 8% 18% 10% 1	1848
	11th to 20th	Day	53% 8% 15% 17% 7% 1	1800
	21st to end	Day	64% 6% 11% 11% 7% 1	1785
November	1st to 10th	Day	55% 7% 12% 17% 8%	1671
	11th to 20th	Day	59% 5% 10% 15% 8% 3	1676
	21st to end	Day	65% 5% 13% 13% 5% 1	1520
December	1st to 10th	Day	74% 3 10% 9% 3 1	1520
	11th to 20th	Day	65% 6% 13% 10% 5% 1	1906
	21st to end	Day	69% 6% 7% 8% 9%	2772
January	1st to 10th	Night	68% 6% 10% 10% 5%	4429
	11th to 20th	Night	75% 5% 9% 7% 3 1	4440
	21st to end	Night	71% 5% 8% 11% 5% 1	4824
February	1st to 10th	Night	67% 5% 11% 10% 6% 1	2470
	11th to 20th	Night	62% 5% 11% 14% 7% 1	2293
	21st to end	Night	59% 6% 13% 13% 8% 1	1884
March	1st to 10th	Night	58% 8% 11% 12% 9% 2	3734
	11th to 20th	Night	59% 5% 13% 14% 8% 1	3622
	21st to end	Night	55% 4 8% 16% 14% 3	3498
April	1st to 10th	Night	57% 4 11% 18% 9% 2	1900
	11th to 20th	Night	53% 6% 12% 17% 11%	1875
	21st to end	Night	53% 6% 10% 18% 11% 3	1800
May	1st to 10th	Night	56% 8% 10% 16% 9% 1	2660
	11th to 20th	Night	53% 9% 12% 17% 8% 1	2496
	21st to end	Night	43% 9% 14% 20% 14% 1	2739
June	1st to 10th	Night	48% 7% 14% 22% 8% 1	1520
	11th to 20th	Night	44% 7% 16% 20% 12% 1	1520
	21st to end	Night	47% 8% 15% 21% 8%	1520
July	1st to 10th	Night	43% 9% 16% 20% 12% 1	2480
	11th to 20th	Night	39% 10% 15% 28% 7%	2472
	21st to end	Night	39% 9% 17% 26% 8% 1	2651
August	1st to 10th	Night	39% 7% 20% 26% 8%	1502
	11th to 20th	Night	42% 6% 19% 24% 9%	1786
	21st to end	Night	38% 8% 17% 27% 10% 1	2080
September	1st to 10th	Night	40% 8% 16% 26% 10% 1	1800
	11th to 20th	Night	37% 7% 12% 30% 13% 1	1863
	21st to end	Night	43% 6% 13% 25% 12% 2	1980
October	1st to 10th	Night	55% 6% 12% 16% 11% 1	2110
	11th to 20th	Night	52% 6% 15% 19% 6% 1	2160
	21st to end	Night	64% 5% 11% 12% 7% 1	2569
November	1st to 10th	Night	55% 7% 13% 15% 9% 2	2407
	11th to 20th	Night	57% 6% 11% 15% 8% 3	2503
	21st to end	Night	62% 6% 13% 13% 5% 1	2660
December	1st to 10th	Night	72% 5% 10% 9% 3	2660
	11th to 20th	Night	66% 5% 11% 11% 7% 1	3288
	21st to end	Night	71% 6% 9% 8% 6%	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	27% 19% 37% 11% 7%	180
	11th to 20th	Day	29% 23% 34% 11% 2 1	180
	21st to end	Day	22% 30% 31% 13% 4 1	213
February	1st to 10th	Day	36% 30% 27% 6% 1	270
	11th to 20th	Day	35% 24% 30% 9% 1	382
	21st to end	Day	35% 23% 26% 14% 2	382
March	1st to 10th	Day	29% 21% 31% 15% 4	460
	11th to 20th	Day	31% 24% 28% 13% 4 1	460
	21st to end	Day	32% 25% 23% 12% 6% 2	506
April	1st to 10th	Day	36% 19% 25% 13% 6% 1	460
	11th to 20th	Day	36% 20% 21% 15% 6% 2	452
	21st to end	Day	33% 18% 28% 11% 7% 3	460
May	1st to 10th	Day	34% 17% 27% 11% 8% 4	463
	11th to 20th	Day	23% 19% 26% 21% 9% 2	487
	21st to end	Day	21% 17% 33% 17% 10% 3	529
June	1st to 10th	Day	26% 16% 29% 20% 8% 1	490
	11th to 20th	Day	21% 16% 30% 21% 11% 2	490
	21st to end	Day	25% 19% 28% 19% 8% 2	490
July	1st to 10th	Day	18% 10% 29% 27% 13% 3	485
	11th to 20th	Day	13% 12% 36% 26% 12% 2	484
	21st to end	Day	16% 11% 35% 26% 10% 2	532
August	1st to 10th	Day	16% 12% 24% 26% 15% 7%	486
	11th to 20th	Day	19% 11% 27% 21% 14% 8%	479
	21st to end	Day	14% 15% 26% 23% 14% 8%	532
September	1st to 10th	Day	18% 10% 27% 20% 15% 9%	450
	11th to 20th	Day	17% 12% 25% 18% 17% 11%	450
	21st to end	Day	20% 12% 28% 20% 15% 5%	450
October	1st to 10th	Day	32% 13% 20% 17% 13% 4	450
	11th to 20th	Day	26% 19% 24% 20% 9% 1	450
	21st to end	Day	34% 18% 23% 20% 6%	397
November	1st to 10th	Day	29% 18% 21% 22% 10%	365
	11th to 20th	Day	31% 23% 21% 18% 6% 1	336
	21st to end	Day	31% 23% 31% 14% 2	180
December	1st to 10th	Day	31% 20% 30% 15% 3 1	180
	11th to 20th	Day	36% 24% 26% 11% 3 1	180
	21st to end	Day	34% 22% 28% 13% 3 1	198
January	1st to 10th	Night	27% 23% 32% 16% 2	760
	11th to 20th	Night	28% 23% 29% 16% 3	760
	21st to end	Night	18% 25% 30% 22% 5%	836
February	1st to 10th	Night	25% 25% 31% 18% 2	760
	11th to 20th	Night	25% 27% 31% 16% 2	743
	21st to end	Night	26% 22% 30% 19% 3	628
March	1st to 10th	Night	27% 20% 30% 20% 2	760
	11th to 20th	Night	27% 23% 26% 19% 4	760
	21st to end	Night	27% 20% 26% 20% 7% 1	836
April	1st to 10th	Night	27% 19% 29% 20% 4	760
	11th to 20th	Night	29% 18% 25% 20% 7% 1	751
	21st to end	Night	28% 18% 24% 22% 8%	660
May	1st to 10th	Night	28% 15% 21% 24% 11%	468
	11th to 20th	Night	18% 16% 23% 34% 8% 1	374
	21st to end	Night	15% 9% 28% 31% 15% 1	411
June	1st to 10th	Night	22% 11% 23% 31% 13% 1	380
	11th to 20th	Night	20% 7% 22% 37% 14%	380
	21st to end	Night	19% 10% 24% 34% 11% 1	380
July	1st to 10th	Night	14% 6% 24% 36% 19% 1	370
	11th to 20th	Night	15% 7% 22% 37% 17% 2	368
	21st to end	Night	11% 9% 20% 44% 15% 1	416
August	1st to 10th	Night	18% 5% 18% 40% 19% 1	378
	11th to 20th	Night	17% 6% 20% 32% 21% 4	662
	21st to end	Night	16% 8% 20% 33% 22% 1	832
September	1st to 10th	Night	16% 9% 23% 33% 17% 3	720
	11th to 20th	Night	15% 10% 22% 28% 22% 4	720
	21st to end	Night	23% 11% 20% 24% 18% 3	720
October	1st to 10th	Night	27% 14% 22% 20% 14% 2	720
	11th to 20th	Night	25% 17% 19% 28% 10% 1	720
	21st to end	Night	31% 19% 24% 20% 6%	792
November	1st to 10th	Night	24% 18% 26% 24% 8% 1	740
	11th to 20th	Night	30% 18% 23% 20% 8% 1	760
	21st to end	Night	29% 21% 26% 18% 6% 1	760
December	1st to 10th	Night	30% 25% 26% 14% 4	760
	11th to 20th	Night	30% 23% 22% 19% 4 1	760
	21st to end	Night	32% 23% 24% 17% 3	836

Page generated at 2024-08-27 09:49:42. Version ac07

Copyright © 2024 Attilla Danko.