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 2024-01-27.

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	18% 11% 5% 8% 7% 4 5% 5% 5% 6% 27%	74873
	Night	17% 11% 5% 9% 7% 3 5% 5% 5% 6% 27%	75171
Transparency	Day	55% 6% 11% 17% 9% 1	74578
	Night	55% 6% 12% 17% 8% 1	75000
Seeing	Day	26% 17% 27% 18% 9% 3	13596
	Night	24% 17% 25% 23% 9% 1	22787

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	13% 17% 8% 13% 9% 4 6% 4 5% 5% 16%	1517
	11th to 20th	Day	15% 15% 7% 11% 9% 4 4 5% 5% 5% 20%	1520
	21st to end	Day	10% 13% 9% 14% 9% 5% 6% 6% 5% 5% 19%	1664
February	1st to 10th	Day	14% 16% 8% 11% 10% 4 5% 6% 5% 5% 16%	1620
	11th to 20th	Day	12% 13% 7% 14% 11% 4 4 4 5% 5% 20%	1678
	21st to end	Day	16% 16% 6% 12% 7% 5% 4 4 3 5% 20%	1480
March	1st to 10th	Day	13% 11% 6% 12% 10% 4 5% 5% 5% 5% 25%	1797
	11th to 20th	Day	15% 15% 6% 10% 8% 3 5% 4 5% 4 25%	1890
	21st to end	Day	19% 11% 4 7% 7% 3 4 3 4 5% 32%	2357
April	1st to 10th	Day	20% 12% 6% 8% 6% 3 5% 4 4 5% 29%	2160
	11th to 20th	Day	18% 12% 4 7% 5% 3 5% 4 4 5% 33%	2134
	21st to end	Day	22% 12% 4 9% 5% 3 4 4 4 5% 26%	2254
May	1st to 10th	Day	21% 13% 4 6% 6% 3 4 4 4 6% 29%	2452
	11th to 20th	Day	20% 10% 4 5% 5% 3 4 4 5% 6% 34%	2478
	21st to end	Day	17% 8% 4 7% 6% 4 5% 5% 5% 7% 31%	2725
June	1st to 10th	Day	21% 7% 4 6% 8% 4 6% 5% 6% 7% 26%	2520
	11th to 20th	Day	19% 7% 3 6% 7% 4 5% 6% 6% 8% 30%	2520
	21st to end	Day	21% 8% 3 7% 6% 4 6% 5% 5% 7% 26%	2520
July	1st to 10th	Day	16% 6% 4 6% 5% 4 6% 5% 6% 8% 34%	2520
	11th to 20th	Day	16% 7% 3 6% 6% 4 5% 6% 7% 8% 31%	2520
	21st to end	Day	16% 6% 3 6% 7% 4 7% 7% 6% 9% 28%	2744
August	1st to 10th	Day	14% 7% 3 7% 7% 4 6% 7% 7% 7% 30%	2506
	11th to 20th	Day	15% 7% 3 8% 6% 3 6% 5% 7% 9% 29%	2188
	21st to end	Day	15% 5% 4 6% 7% 4 5% 6% 7% 8% 33%	2376
September	1st to 10th	Day	17% 6% 3 6% 6% 3 4 5% 5% 7% 38%	2160
	11th to 20th	Day	17% 6% 2 5% 5% 2 4 4 5% 7% 43%	2095
	21st to end	Day	20% 7% 2 6% 4 3 4 5% 5% 7% 36%	1980
October	1st to 10th	Day	25% 12% 4 5% 6% 4 4 3 3 5% 29%	1848
	11th to 20th	Day	20% 13% 4 6% 5% 4 4 5% 6% 7% 28%	1800
	21st to end	Day	26% 14% 5% 8% 5% 3 4 3 5% 5% 21%	1785
November	1st to 10th	Day	15% 13% 5% 8% 7% 3 6% 4 5% 6% 28%	1671
	11th to 20th	Day	17% 14% 7% 8% 7% 3 5% 4 4 5% 26%	1676
	21st to end	Day	18% 16% 7% 10% 8% 3 5% 4 4 5% 21%	1520
December	1st to 10th	Day	20% 19% 9% 11% 9% 3 3 3 3 4 15%	1520
	11th to 20th	Day	20% 15% 7% 12% 6% 3 4 4 3 7% 19%	1906
	21st to end	Day	21% 16% 8% 13% 8% 3 3 3 4 5% 16%	2772
January	1st to 10th	Night	15% 13% 9% 14% 9% 4 6% 6% 5% 5% 15%	2649
	11th to 20th	Night	15% 17% 7% 13% 8% 4 5% 6% 5% 5% 15%	2660
	21st to end	Night	11% 13% 7% 14% 8% 5% 6% 6% 5% 6% 20%	2836
February	1st to 10th	Night	14% 14% 6% 13% 11% 5% 8% 5% 5% 4 15%	2340
	11th to 20th	Night	12% 11% 6% 13% 11% 5% 6% 5% 5% 7% 19%	2167
	21st to end	Night	13% 13% 7% 12% 9% 4 6% 5% 5% 6% 20%	1776
March	1st to 10th	Night	13% 11% 5% 10% 10% 4 7% 5% 5% 5% 25%	2150
	11th to 20th	Night	13% 15% 6% 9% 7% 4 4 4 3 6% 27%	2065
	21st to end	Night	16% 12% 5% 6% 6% 4 5% 4 4 6% 33%	1998
April	1st to 10th	Night	20% 9% 5% 9% 7% 4 5% 5% 4 5% 27%	1800
	11th to 20th	Night	18% 11% 6% 8% 5% 3 4 4 5% 6% 30%	1775
	21st to end	Night	19% 10% 5% 8% 5% 3 5% 4 5% 6% 30%	1706
May	1st to 10th	Night	21% 12% 3 7% 5% 4 4 3 5% 6% 30%	1524
	11th to 20th	Night	17% 10% 3 6% 4 3 4 5% 5% 7% 36%	1415
	21st to end	Night	14% 7% 4 6% 5% 3 4 7% 6% 7% 36%	1550
June	1st to 10th	Night	21% 7% 2 6% 6% 3 4 5% 5% 7% 34%	1440
	11th to 20th	Night	19% 6% 3 5% 6% 3 5% 5% 5% 8% 37%	1440
	21st to end	Night	18% 7% 3 6% 5% 4 5% 5% 7% 8% 34%	1440
July	1st to 10th	Night	15% 5% 3 4 5% 3 5% 5% 5% 7% 43%	1440
	11th to 20th	Night	12% 5% 3 5% 6% 3 5% 5% 6% 8% 40%	1440
	21st to end	Night	11% 5% 4 6% 5% 2 4 5% 6% 11% 40%	1574
August	1st to 10th	Night	13% 6% 2 6% 5% 3 5% 4 5% 7% 44%	1432
	11th to 20th	Night	15% 8% 3 6% 5% 3 4 5% 6% 7% 38%	1690
	21st to end	Night	15% 5% 2 5% 5% 3 5% 5% 5% 8% 41%	1980
September	1st to 10th	Night	14% 7% 3 6% 4 3 4 5% 5% 8% 42%	1800
	11th to 20th	Night	14% 6% 2 6% 4 3 3 4 5% 7% 45%	1863
	21st to end	Night	18% 7% 2 4 5% 3 4 4 5% 6% 41%	1980
October	1st to 10th	Night	22% 10% 5% 6% 5% 4 4 4 5% 6% 29%	2110
	11th to 20th	Night	18% 12% 4 7% 6% 4 5% 5% 5% 7% 29%	2160
	21st to end	Night	23% 14% 5% 9% 7% 3 5% 5% 4 5% 20%	2569
November	1st to 10th	Night	14% 13% 6% 10% 6% 3 4 5% 6% 6% 27%	2407
	11th to 20th	Night	18% 12% 6% 9% 6% 3 5% 5% 4 6% 26%	2503
	21st to end	Night	17% 14% 6% 11% 7% 4 4 5% 5% 5% 19%	2660
December	1st to 10th	Night	19% 17% 9% 13% 8% 4 5% 5% 4 5% 12%	2660
	11th to 20th	Night	20% 15% 6% 12% 8% 3 4 4 4 5% 19%	3288
	21st to end	Night	23% 17% 6% 15% 7% 3 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	69% 4 9% 13% 5%	1518
	11th to 20th	Day	65% 4 9% 12% 7% 3	1520
	21st to end	Day	64% 4 11% 11% 7% 3	1664
February	1st to 10th	Day	67% 5% 9% 13% 4 2	1620
	11th to 20th	Day	65% 5% 9% 11% 8% 1	1687
	21st to end	Day	65% 5% 10% 10% 9% 1	1480
March	1st to 10th	Day	61% 5% 11% 14% 8% 2	1800
	11th to 20th	Day	61% 4 10% 11% 11% 2	1890
	21st to end	Day	55% 4 8% 15% 14% 4	2357
April	1st to 10th	Day	57% 3 10% 16% 11% 2	2160
	11th to 20th	Day	53% 5% 8% 19% 13% 1	2134
	21st to end	Day	59% 5% 10% 13% 10% 3	2254
May	1st to 10th	Day	56% 5% 8% 18% 11% 1	2452
	11th to 20th	Day	49% 5% 10% 22% 12% 2	2482
	21st to end	Day	50% 7% 13% 18% 10% 1	2725
June	1st to 10th	Day	55% 8% 13% 15% 9% 1	2520
	11th to 20th	Day	50% 7% 12% 20% 10% 1	2520
	21st to end	Day	54% 8% 12% 17% 8% 1	2520
July	1st to 10th	Day	45% 8% 12% 23% 11%	2450
	11th to 20th	Day	46% 9% 15% 23% 6%	2445
	21st to end	Day	48% 9% 14% 19% 9%	2591
August	1st to 10th	Day	47% 9% 16% 20% 8%	2492
	11th to 20th	Day	47% 9% 15% 21% 8%	2188
	21st to end	Day	45% 8% 13% 24% 9% 1	2376
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	69% 5% 11% 10% 6%	2649
	11th to 20th	Night	68% 5% 10% 11% 5% 2	2660
	21st to end	Night	61% 5% 9% 14% 8% 2	2836
February	1st to 10th	Night	68% 5% 11% 9% 5% 1	2340
	11th to 20th	Night	62% 5% 12% 14% 7% 1	2169
	21st to end	Night	60% 5% 13% 13% 8% 1	1776
March	1st to 10th	Night	58% 6% 12% 16% 7% 2	2160
	11th to 20th	Night	59% 4 11% 15% 9% 2	2066
	21st to end	Night	53% 4 10% 16% 13% 3	1998
April	1st to 10th	Night	56% 4 10% 18% 9% 2	1800
	11th to 20th	Night	52% 6% 13% 17% 11% 1	1775
	21st to end	Night	53% 6% 10% 18% 10% 3	1706
May	1st to 10th	Night	55% 6% 8% 15% 15% 2	1524
	11th to 20th	Night	45% 6% 12% 20% 14% 2	1416
	21st to end	Night	44% 7% 16% 19% 11% 2	1551
June	1st to 10th	Night	48% 6% 15% 22% 8% 1	1440
	11th to 20th	Night	45% 7% 15% 20% 12% 1	1440
	21st to end	Night	46% 8% 16% 22% 8%	1440
July	1st to 10th	Night	37% 9% 17% 24% 13% 1	1400
	11th to 20th	Night	38% 9% 16% 29% 8%	1392
	21st to end	Night	36% 9% 20% 24% 10% 1	1486
August	1st to 10th	Night	37% 7% 20% 27% 8%	1422
	11th to 20th	Night	42% 7% 18% 24% 9%	1690
	21st to end	Night	39% 8% 16% 27% 10%	1980
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% 12% 4 1	202
February	1st to 10th	Day	39% 32% 26% 3	240
	11th to 20th	Day	36% 23% 30% 9% 1	346
	21st to end	Day	35% 24% 26% 13% 2	346
March	1st to 10th	Day	28% 21% 32% 15% 3	420
	11th to 20th	Day	30% 24% 28% 13% 4 1	420
	21st to end	Day	32% 23% 23% 12% 7% 2	462
April	1st to 10th	Day	35% 19% 25% 14% 6% 1	420
	11th to 20th	Day	33% 19% 22% 16% 7% 3	412
	21st to end	Day	34% 17% 28% 11% 7% 3	420
May	1st to 10th	Day	33% 18% 26% 10% 8% 4	423
	11th to 20th	Day	24% 20% 27% 20% 7% 2	447
	21st to end	Day	22% 16% 32% 16% 11% 3	485
June	1st to 10th	Day	26% 15% 29% 21% 8% 1	450
	11th to 20th	Day	22% 16% 29% 20% 10% 2	450
	21st to end	Day	23% 18% 29% 19% 8% 2	450
July	1st to 10th	Day	19% 9% 28% 28% 13% 3	445
	11th to 20th	Day	14% 11% 35% 26% 12% 2	444
	21st to end	Day	16% 11% 35% 26% 9% 2	488
August	1st to 10th	Day	14% 12% 25% 26% 16% 7%	446
	11th to 20th	Day	18% 10% 28% 21% 15% 8%	439
	21st to end	Day	15% 16% 25% 23% 14% 7%	495
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	19% 26% 30% 21% 5%	820
February	1st to 10th	Night	26% 26% 31% 16% 2	720
	11th to 20th	Night	24% 27% 31% 16% 2	703
	21st to end	Night	26% 23% 30% 18% 3	592
March	1st to 10th	Night	27% 20% 31% 21% 1	720
	11th to 20th	Night	27% 23% 27% 18% 5%	720
	21st to end	Night	27% 19% 26% 20% 7% 1	792
April	1st to 10th	Night	27% 19% 29% 20% 5%	720
	11th to 20th	Night	27% 19% 26% 20% 7% 1	711
	21st to end	Night	28% 17% 25% 23% 8%	626
May	1st to 10th	Night	29% 15% 21% 23% 11%	444
	11th to 20th	Night	18% 17% 24% 33% 8% 1	354
	21st to end	Night	16% 10% 28% 30% 15% 1	389
June	1st to 10th	Night	23% 10% 23% 30% 13% 1	360
	11th to 20th	Night	21% 7% 23% 35% 14%	360
	21st to end	Night	18% 9% 25% 36% 11% 1	360
July	1st to 10th	Night	14% 5% 24% 35% 20% 1	350
	11th to 20th	Night	15% 6% 23% 37% 18% 2	348
	21st to end	Night	11% 9% 21% 43% 15% 1	394
August	1st to 10th	Night	16% 5% 18% 41% 20% 1	358
	11th to 20th	Night	16% 6% 21% 32% 21% 4	626
	21st to end	Night	16% 8% 20% 33% 21% 1	792
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

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