Lime Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lime Lake clear sky chart from 2005-11-06 to 2026-06-01.

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	15% 13% 5% 11% 6% 5% 5% 3 5% 6% 26%	132396
	Night	14% 15% 6% 13% 7% 5% 4 3 4 5% 24%	130748
Transparency	Day	58% 5% 10% 17% 9% 1	135989
	Night	61% 5% 9% 15% 8% 1	135241
Seeing	Day	27% 19% 29% 16% 8% 2	16536
	Night	26% 18% 28% 20% 8% 1	26014

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% 21% 10% 26% 9% 3 3 2 2 3 9%	4661
	11th to 20th	Day	8% 21% 10% 25% 10% 8% 3 2 3 3 9%	5106
	21st to end	Day	13% 13% 7% 17% 12% 11% 9% 3 4 3 8%	5780
February	1st to 10th	Day	13% 20% 8% 17% 10% 5% 4 3 2 3 15%	1890
	11th to 20th	Day	11% 16% 9% 20% 9% 4 4 3 4 4 15%	1843
	21st to end	Day	16% 18% 6% 14% 8% 4 4 4 4 5% 19%	1647
March	1st to 10th	Day	14% 13% 9% 14% 6% 5% 3 2 3 4 27%	5040
	11th to 20th	Day	10% 18% 7% 11% 4 4 4 3 4 5% 30%	5090
	21st to end	Day	17% 16% 6% 12% 5% 4 4 3 4 4 24%	5586
April	1st to 10th	Day	16% 19% 5% 9% 5% 3 4 4 4 6% 26%	2516
	11th to 20th	Day	17% 16% 4 7% 3 4 4 4 5% 5% 31%	2494
	21st to end	Day	20% 13% 3 7% 4 4 4 2 4 5% 32%	2702
May	1st to 10th	Day	25% 11% 3 8% 5% 4 4 3 5% 6% 26%	6018
	11th to 20th	Day	18% 11% 4 9% 6% 5% 5% 3 5% 7% 28%	6447
	21st to end	Day	19% 9% 3 7% 5% 5% 5% 4 5% 6% 31%	7103
June	1st to 10th	Day	18% 8% 3 7% 5% 4 4 4 5% 7% 35%	2800
	11th to 20th	Day	16% 7% 3 7% 5% 5% 5% 5% 7% 8% 32%	2800
	21st to end	Day	16% 7% 2 6% 5% 4 6% 4 6% 9% 36%	2800
July	1st to 10th	Day	10% 6% 2 7% 5% 5% 5% 5% 7% 9% 38%	6360
	11th to 20th	Day	11% 8% 3 8% 5% 5% 6% 5% 7% 9% 35%	6360
	21st to end	Day	11% 6% 3 7% 5% 5% 5% 4 6% 8% 41%	6478
August	1st to 10th	Day	17% 7% 3 7% 5% 4 5% 4 7% 7% 34%	4234
	11th to 20th	Day	15% 8% 3 9% 6% 7% 7% 5% 8% 8% 24%	4174
	21st to end	Day	14% 6% 3 7% 5% 5% 5% 4 6% 9% 37%	4379
September	1st to 10th	Day	16% 8% 2 8% 4 4 4 3 6% 8% 37%	2400
	11th to 20th	Day	14% 6% 2 5% 5% 4 5% 3 6% 8% 41%	2345
	21st to end	Day	19% 9% 3 8% 5% 5% 5% 4 6% 7% 29%	2119
October	1st to 10th	Day	20% 9% 3 7% 5% 4 5% 3 5% 7% 34%	2000
	11th to 20th	Day	20% 16% 3 8% 5% 4 4 3 4 5% 28%	2000
	21st to end	Day	23% 19% 4 7% 5% 4 4 3 5% 5% 22%	2200
November	1st to 10th	Day	14% 19% 4 7% 5% 5% 4 3 4 5% 29%	1870
	11th to 20th	Day	14% 26% 6% 10% 4 3 4 3 5% 6% 20%	1680
	21st to end	Day	15% 26% 9% 11% 5% 3 4 2 4 5% 16%	1680
December	1st to 10th	Day	14% 27% 14% 21% 5% 3 3 2 2 3 8%	2680
	11th to 20th	Day	17% 21% 8% 17% 7% 4 4 3 4 3 12%	3066
	21st to end	Day	17% 25% 9% 13% 7% 4 3 3 4 5% 12%	4048
January	1st to 10th	Night	11% 20% 10% 28% 12% 4 3 2 2 2 6%	8234
	11th to 20th	Night	7% 18% 11% 26% 12% 6% 5% 2 3 3 6%	7777
	21st to end	Night	10% 15% 9% 17% 11% 10% 8% 3 3 3 10%	8401
February	1st to 10th	Night	13% 20% 7% 18% 9% 7% 4 2 3 4 14%	2730
	11th to 20th	Night	10% 15% 8% 21% 9% 7% 5% 3 3 5% 14%	2663
	21st to end	Night	14% 17% 6% 18% 10% 4 3 3 4 4 17%	2157
March	1st to 10th	Night	15% 15% 6% 12% 8% 5% 4 3 4 5% 23%	5018
	11th to 20th	Night	12% 16% 7% 11% 5% 3 3 3 4 6% 30%	5089
	21st to end	Night	13% 15% 6% 13% 5% 5% 4 3 4 5% 27%	5588
April	1st to 10th	Night	17% 16% 6% 9% 5% 5% 4 2 5% 5% 27%	2102
	11th to 20th	Night	18% 15% 3 6% 5% 4 4 3 4 5% 33%	2075
	21st to end	Night	16% 13% 4 8% 4 5% 4 4 5% 8% 31%	1936
May	1st to 10th	Night	25% 14% 3 8% 4 4 4 3 4 5% 27%	4143
	11th to 20th	Night	17% 11% 3 8% 5% 5% 4 4 4 6% 33%	3663
	21st to end	Night	17% 13% 3 6% 4 3 4 4 5% 8% 34%	4014
June	1st to 10th	Night	14% 7% 3 7% 5% 6% 5% 4 6% 9% 34%	1600
	11th to 20th	Night	13% 6% 2 6% 5% 5% 4 4 7% 8% 39%	1600
	21st to end	Night	14% 7% 3 6% 4 5% 5% 3 6% 6% 41%	1600
July	1st to 10th	Night	12% 8% 3 8% 5% 4 4 3 6% 9% 39%	3600
	11th to 20th	Night	11% 6% 3 7% 4 4 5% 4 6% 9% 41%	3600
	21st to end	Night	11% 6% 2 6% 4 4 5% 4 5% 7% 46%	4371
August	1st to 10th	Night	13% 9% 3 7% 4 5% 5% 4 6% 7% 38%	2915
	11th to 20th	Night	16% 8% 3 9% 5% 5% 4 4 5% 8% 32%	2875
	21st to end	Night	9% 7% 3 6% 5% 4 5% 4 7% 8% 43%	3485
September	1st to 10th	Night	15% 7% 2 5% 4 3 4 4 5% 7% 44%	2000
	11th to 20th	Night	13% 6% 2 6% 4 4 4 3 4 7% 47%	2050
	21st to end	Night	19% 9% 3 8% 5% 4 4 4 6% 6% 33%	2280
October	1st to 10th	Night	18% 7% 3 8% 4 4 4 4 5% 6% 37%	2400
	11th to 20th	Night	20% 12% 4 7% 4 5% 4 3 5% 6% 29%	2400
	21st to end	Night	25% 15% 3 7% 4 4 3 3 4 6% 25%	2640
November	1st to 10th	Night	15% 18% 3 7% 6% 4 4 3 4 5% 31%	2644
	11th to 20th	Night	14% 21% 5% 9% 5% 5% 4 4 5% 5% 21%	2940
	21st to end	Night	14% 23% 9% 13% 6% 4 3 3 4 5% 17%	2940
December	1st to 10th	Night	13% 22% 12% 21% 7% 5% 4 3 3 3 8%	4720
	11th to 20th	Night	15% 23% 10% 18% 6% 4 4 2 3 3 12%	5348
	21st to end	Night	15% 22% 9% 15% 8% 5% 4 3 3 4 11%	7150

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	82% 4 4 6% 4	4662
	11th to 20th	Day	83% 2 5% 6% 3	5140
	21st to end	Day	80% 5% 6% 6% 2	5780
February	1st to 10th	Day	77% 4 7% 8% 3	1890
	11th to 20th	Day	74% 3 6% 12% 5%	1852
	21st to end	Day	68% 4 9% 13% 5% 1	1647
March	1st to 10th	Day	62% 4 10% 18% 6%	5043
	11th to 20th	Day	56% 4 16% 16% 6% 2	5090
	21st to end	Day	62% 4 5% 17% 9% 1	5586
April	1st to 10th	Day	60% 4 9% 16% 10%	2516
	11th to 20th	Day	54% 5% 9% 20% 10% 2	2494
	21st to end	Day	55% 4 10% 17% 13% 1	2702
May	1st to 10th	Day	59% 5% 8% 17% 9% 3	6027
	11th to 20th	Day	54% 7% 8% 19% 10% 1	6451
	21st to end	Day	52% 7% 10% 19% 11% 2	7103
June	1st to 10th	Day	48% 6% 11% 20% 14% 1	2800
	11th to 20th	Day	47% 8% 12% 21% 12%	2800
	21st to end	Day	44% 8% 12% 22% 13%	2800
July	1st to 10th	Day	41% 6% 12% 25% 14% 1	6290
	11th to 20th	Day	43% 6% 13% 21% 17%	6285
	21st to end	Day	41% 6% 11% 26% 16%	6292
August	1st to 10th	Day	47% 7% 12% 22% 12%	4221
	11th to 20th	Day	52% 9% 12% 20% 6%	4213
	21st to end	Day	43% 7% 10% 31% 9% 1	4379
September	1st to 10th	Day	45% 7% 9% 26% 12% 1	2400
	11th to 20th	Day	41% 6% 11% 27% 14% 1	2345
	21st to end	Day	52% 6% 10% 20% 10% 1	2119
October	1st to 10th	Day	44% 6% 11% 23% 14% 1	3260
	11th to 20th	Day	51% 4 13% 14% 15% 4	3240
	21st to end	Day	51% 4 14% 22% 8% 1	3538
November	1st to 10th	Day	57% 5% 10% 16% 10% 2	1870
	11th to 20th	Day	65% 4 9% 14% 5% 2	1680
	21st to end	Day	73% 4 9% 10% 4 1	1680
December	1st to 10th	Day	84% 3 5% 6% 2	2680
	11th to 20th	Day	76% 4 8% 9% 2	3066
	21st to end	Day	76% 4 9% 7% 4	4048
January	1st to 10th	Night	86% 3 5% 5% 2	8234
	11th to 20th	Night	84% 3 6% 4 2	7818
	21st to end	Night	78% 4 5% 8% 3	8401
February	1st to 10th	Night	77% 3 8% 9% 4	2730
	11th to 20th	Night	74% 4 7% 10% 4	2665
	21st to end	Night	71% 4 8% 11% 6% 1	2157
March	1st to 10th	Night	64% 5% 10% 15% 6%	5028
	11th to 20th	Night	56% 4 13% 18% 5% 3	5090
	21st to end	Night	57% 6% 8% 15% 12% 2	5588
April	1st to 10th	Night	60% 5% 9% 16% 9% 1	2102
	11th to 20th	Night	53% 5% 11% 17% 12% 1	2075
	21st to end	Night	51% 6% 10% 20% 11% 2	1936
May	1st to 10th	Night	60% 5% 7% 15% 10% 3	4150
	11th to 20th	Night	50% 8% 12% 20% 9% 1	3664
	21st to end	Night	48% 7% 11% 20% 12% 2	4015
June	1st to 10th	Night	46% 6% 10% 23% 13% 1	1600
	11th to 20th	Night	41% 7% 14% 23% 13% 2	1600
	21st to end	Night	42% 8% 13% 24% 11% 2	1600
July	1st to 10th	Night	43% 5% 13% 24% 14% 1	3560
	11th to 20th	Night	39% 6% 14% 25% 14% 1	3552
	21st to end	Night	36% 5% 13% 24% 19% 2	4242
August	1st to 10th	Night	44% 5% 14% 27% 8% 2	2904
	11th to 20th	Night	49% 7% 13% 23% 7%	2902
	21st to end	Night	36% 8% 13% 32% 9% 1	3485
September	1st to 10th	Night	38% 7% 12% 27% 13% 2	2000
	11th to 20th	Night	37% 6% 12% 28% 16% 1	2050
	21st to end	Night	49% 7% 11% 20% 11% 1	2280
October	1st to 10th	Night	47% 5% 8% 22% 17%	3920
	11th to 20th	Night	49% 5% 11% 16% 14% 4	3899
	21st to end	Night	48% 4 14% 23% 10% 1	4252
November	1st to 10th	Night	54% 5% 10% 20% 9% 2	2644
	11th to 20th	Night	63% 5% 11% 12% 6% 3	2940
	21st to end	Night	70% 5% 11% 11% 3	2940
December	1st to 10th	Night	82% 4 7% 5% 2	4720
	11th to 20th	Night	78% 4 6% 9% 3	5348
	21st to end	Night	77% 5% 7% 8% 3	7150

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	34% 31% 25% 8% 2	220
	11th to 20th	Day	36% 37% 20% 5% 1 1	305
	21st to end	Day	36% 27% 27% 8% 2	363
February	1st to 10th	Day	37% 29% 25% 8% 1	330
	11th to 20th	Day	36% 31% 31% 2 1	330
	21st to end	Day	39% 30% 26% 4 1	363
March	1st to 10th	Day	33% 26% 29% 10% 3	540
	11th to 20th	Day	34% 26% 30% 7% 2	540
	21st to end	Day	38% 21% 27% 11% 3 1	594
April	1st to 10th	Day	35% 24% 26% 11% 4 1	540
	11th to 20th	Day	34% 24% 26% 8% 6% 2	532
	21st to end	Day	31% 21% 30% 15% 3 1	540
May	1st to 10th	Day	33% 20% 28% 13% 5% 1	543
	11th to 20th	Day	25% 17% 30% 19% 7% 2	567
	21st to end	Day	22% 16% 29% 21% 9% 3	617
June	1st to 10th	Day	23% 19% 30% 21% 7% 1	530
	11th to 20th	Day	20% 13% 31% 22% 12% 1	530
	21st to end	Day	20% 15% 37% 19% 8% 1	530
July	1st to 10th	Day	13% 11% 33% 23% 15% 4	525
	11th to 20th	Day	15% 10% 28% 29% 13% 5%	524
	21st to end	Day	13% 11% 36% 25% 12% 3	576
August	1st to 10th	Day	13% 9% 30% 27% 15% 6%	526
	11th to 20th	Day	18% 8% 30% 24% 15% 5%	519
	21st to end	Day	17% 11% 29% 24% 13% 7%	583
September	1st to 10th	Day	18% 14% 25% 20% 16% 6%	530
	11th to 20th	Day	14% 8% 24% 24% 21% 9%	530
	21st to end	Day	21% 15% 30% 18% 12% 4	530
October	1st to 10th	Day	24% 15% 25% 20% 13% 4	530
	11th to 20th	Day	32% 21% 27% 15% 5% 1	530
	21st to end	Day	37% 19% 27% 14% 2	583
November	1st to 10th	Day	29% 23% 28% 13% 5% 2	414
	11th to 20th	Day	38% 23% 28% 10% 1 1	220
	21st to end	Day	38% 28% 29% 5%	220
December	1st to 10th	Day	39% 26% 28% 4 3	220
	11th to 20th	Day	43% 25% 27% 5%	220
	21st to end	Day	40% 24% 30% 5% 2	242
January	1st to 10th	Night	30% 29% 29% 10% 2	840
	11th to 20th	Night	32% 28% 28% 10% 2	840
	21st to end	Night	27% 29% 29% 13% 2	924
February	1st to 10th	Night	29% 30% 28% 12% 1	840
	11th to 20th	Night	29% 30% 31% 9% 1	823
	21st to end	Night	33% 27% 28% 11% 1	692
March	1st to 10th	Night	29% 26% 29% 14% 3	840
	11th to 20th	Night	33% 22% 27% 15% 3	840
	21st to end	Night	27% 22% 32% 15% 4 1	924
April	1st to 10th	Night	30% 21% 30% 17% 3	840
	11th to 20th	Night	30% 18% 29% 18% 5% 1	831
	21st to end	Night	25% 13% 31% 26% 5%	676
May	1st to 10th	Night	24% 14% 27% 27% 8% 1	630
	11th to 20th	Night	16% 14% 33% 31% 6%	422
	21st to end	Night	16% 11% 28% 30% 13% 1	455
June	1st to 10th	Night	17% 8% 34% 29% 11% 1	400
	11th to 20th	Night	18% 7% 31% 35% 10%	400
	21st to end	Night	16% 6% 35% 33% 10%	400
July	1st to 10th	Night	13% 4 25% 41% 16% 2	390
	11th to 20th	Night	12% 5% 27% 35% 20% 2	388
	21st to end	Night	15% 4 24% 38% 18% 1	626
August	1st to 10th	Night	12% 5% 24% 36% 21% 2	597
	11th to 20th	Night	15% 5% 21% 31% 25% 3	594
	21st to end	Night	14% 7% 27% 31% 20% 2	818
September	1st to 10th	Night	20% 6% 24% 30% 18% 2	800
	11th to 20th	Night	15% 7% 20% 29% 26% 3	800
	21st to end	Night	23% 13% 22% 25% 15% 3	800
October	1st to 10th	Night	21% 13% 28% 22% 15% 1	800
	11th to 20th	Night	30% 15% 31% 18% 6% 1	800
	21st to end	Night	35% 16% 29% 16% 3	880
November	1st to 10th	Night	28% 18% 29% 19% 6%	820
	11th to 20th	Night	31% 23% 26% 14% 5% 1	840
	21st to end	Night	33% 25% 27% 12% 3	840
December	1st to 10th	Night	35% 28% 26% 8% 3	840
	11th to 20th	Night	33% 28% 27% 11% 1	840
	21st to end	Night	34% 27% 29% 9% 1	924

Page generated at 2026-05-29 01:53:26. Version ac07

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