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 2025-02-06.

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%	108616
	Night	14% 15% 6% 13% 6% 4 4 3 4 5% 24%	109624
Transparency	Day	57% 6% 10% 18% 9% 1	112254
	Night	60% 5% 10% 16% 8% 1	114149
Seeing	Day	26% 19% 29% 16% 8% 2	14812
	Night	25% 18% 28% 20% 8% 1	24350

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	11% 20% 12% 24% 7% 4 4 3 3 3 9%	3597
	11th to 20th	Day	8% 22% 10% 26% 9% 5% 2 2 2 3 9%	3914
	21st to end	Day	16% 15% 8% 19% 10% 5% 6% 3 4 4 9%	4466
February	1st to 10th	Day	14% 21% 8% 17% 10% 4 4 3 2 3 14%	1755
	11th to 20th	Day	11% 16% 9% 20% 9% 4 4 3 4 4 16%	1663
	21st to end	Day	17% 17% 5% 15% 7% 4 4 3 3 5% 19%	1494
March	1st to 10th	Day	17% 13% 8% 12% 5% 4 3 3 4 5% 27%	3430
	11th to 20th	Day	8% 23% 8% 11% 4 4 4 3 4 5% 27%	3480
	21st to end	Day	16% 16% 5% 12% 5% 4 4 3 5% 5% 25%	3815
April	1st to 10th	Day	16% 18% 5% 8% 5% 3 4 4 4 6% 27%	2276
	11th to 20th	Day	18% 16% 4 6% 3 4 4 4 5% 5% 32%	2254
	21st to end	Day	21% 14% 3 7% 4 4 4 2 4 5% 32%	2444
May	1st to 10th	Day	22% 10% 3 7% 5% 4 4 3 5% 6% 30%	4108
	11th to 20th	Day	18% 11% 3 8% 6% 6% 5% 4 6% 7% 26%	4388
	21st to end	Day	12% 7% 3 7% 5% 4 5% 3 6% 7% 40%	4837
June	1st to 10th	Day	18% 8% 3 7% 5% 4 4 4 5% 7% 35%	2660
	11th to 20th	Day	15% 7% 3 6% 5% 5% 5% 5% 7% 8% 33%	2660
	21st to end	Day	16% 7% 2 6% 5% 4 6% 4 6% 8% 36%	2660
July	1st to 10th	Day	11% 6% 2 7% 6% 6% 6% 5% 7% 10% 35%	4440
	11th to 20th	Day	11% 8% 2 7% 4 5% 5% 5% 7% 9% 36%	4440
	21st to end	Day	10% 6% 3 8% 6% 6% 6% 5% 7% 9% 35%	4506
August	1st to 10th	Day	18% 7% 3 7% 6% 4 5% 4 7% 7% 33%	4104
	11th to 20th	Day	15% 8% 3 9% 6% 7% 8% 5% 8% 8% 24%	4044
	21st to end	Day	14% 6% 3 7% 5% 5% 5% 4 6% 9% 37%	4245
September	1st to 10th	Day	16% 8% 2 8% 4 4 4 3 6% 8% 36%	2280
	11th to 20th	Day	15% 6% 3 5% 5% 4 4 3 6% 8% 40%	2228
	21st to end	Day	19% 9% 3 8% 5% 5% 5% 4 6% 7% 29%	2013
October	1st to 10th	Day	20% 9% 3 7% 5% 5% 5% 3 5% 7% 31%	1900
	11th to 20th	Day	20% 16% 3 8% 5% 4 3 3 4 5% 28%	1900
	21st to end	Day	23% 19% 4 7% 5% 4 4 3 4 5% 22%	2090
November	1st to 10th	Day	14% 19% 4 7% 5% 5% 4 3 4 5% 30%	1779
	11th to 20th	Day	15% 25% 6% 9% 4 3 4 3 5% 6% 20%	1600
	21st to end	Day	16% 26% 8% 11% 5% 3 4 2 4 5% 16%	1600
December	1st to 10th	Day	14% 27% 14% 21% 5% 3 3 2 2 2 7%	2600
	11th to 20th	Day	17% 21% 8% 17% 7% 4 4 4 4 3 12%	2986
	21st to end	Day	17% 25% 9% 12% 7% 4 3 3 4 5% 12%	3960
January	1st to 10th	Night	11% 19% 10% 27% 12% 4 3 2 2 3 7%	6349
	11th to 20th	Night	7% 18% 11% 27% 10% 5% 5% 3 3 3 7%	5969
	21st to end	Night	13% 17% 10% 18% 10% 6% 6% 3 3 4 10%	6490
February	1st to 10th	Night	14% 21% 7% 17% 10% 6% 3 2 3 4 14%	2536
	11th to 20th	Night	10% 15% 8% 20% 9% 6% 5% 3 3 5% 14%	2403
	21st to end	Night	15% 17% 6% 17% 9% 4 4 3 4 4 18%	1958
March	1st to 10th	Night	19% 16% 6% 10% 5% 4 3 2 3 5% 27%	3408
	11th to 20th	Night	15% 19% 8% 13% 5% 3 3 2 4 5% 22%	3479
	21st to end	Night	13% 14% 5% 12% 5% 4 4 3 5% 5% 31%	3817
April	1st to 10th	Night	16% 17% 5% 8% 5% 4 4 2 5% 6% 28%	1902
	11th to 20th	Night	18% 14% 3 6% 5% 4 4 3 4 5% 34%	1875
	21st to end	Night	16% 13% 4 8% 4 5% 4 4 5% 8% 31%	1752
May	1st to 10th	Night	23% 12% 2 7% 4 4 4 3 4 6% 30%	2833
	11th to 20th	Night	16% 10% 3 8% 5% 5% 5% 4 5% 7% 32%	2503
	21st to end	Night	13% 8% 2 5% 4 3 4 4 6% 8% 43%	2738
June	1st to 10th	Night	14% 7% 3 7% 5% 6% 6% 4 6% 9% 33%	1520
	11th to 20th	Night	13% 6% 2 6% 6% 4 4 4 6% 8% 40%	1520
	21st to end	Night	15% 7% 3 6% 4 5% 5% 3 6% 6% 40%	1520
July	1st to 10th	Night	13% 8% 3 8% 5% 4 3 3 6% 8% 40%	2520
	11th to 20th	Night	11% 6% 3 7% 4 4 5% 4 6% 8% 43%	2520
	21st to end	Night	11% 7% 3 6% 4 4 5% 4 6% 7% 44%	3044
August	1st to 10th	Night	13% 9% 3 7% 4 5% 5% 4 6% 7% 37%	2825
	11th to 20th	Night	16% 9% 3 9% 5% 5% 4 4 5% 8% 32%	2785
	21st to end	Night	9% 7% 3 6% 5% 4 5% 4 7% 8% 43%	3378
September	1st to 10th	Night	16% 7% 2 5% 4 3 4 4 5% 7% 43%	1900
	11th to 20th	Night	14% 6% 2 6% 4 4 4 3 4 7% 46%	1947
	21st to end	Night	19% 9% 3 8% 5% 4 4 4 6% 6% 33%	2166
October	1st to 10th	Night	19% 7% 3 8% 4 4 5% 4 5% 6% 36%	2280
	11th to 20th	Night	21% 13% 4 7% 4 5% 4 3 4 6% 29%	2280
	21st to end	Night	26% 15% 3 7% 4 4 4 3 4 6% 25%	2508
November	1st to 10th	Night	15% 17% 3 7% 5% 4 4 3 4 5% 32%	2515
	11th to 20th	Night	15% 21% 5% 9% 5% 5% 4 4 5% 6% 21%	2800
	21st to end	Night	14% 23% 9% 13% 5% 4 3 3 4 5% 17%	2800
December	1st to 10th	Night	13% 23% 12% 21% 7% 5% 4 3 3 3 7%	4580
	11th to 20th	Night	16% 23% 10% 17% 6% 4 4 2 3 3 12%	5208
	21st to end	Night	15% 22% 9% 15% 8% 5% 4 3 3 4 11%	6996

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	80% 5% 5% 5% 5%	3598
	11th to 20th	Day	83% 2 6% 6% 3	3948
	21st to end	Day	78% 5% 7% 7% 2	4466
February	1st to 10th	Day	77% 4 8% 7% 3	1755
	11th to 20th	Day	73% 3 6% 12% 5%	1672
	21st to end	Day	68% 4 10% 13% 5% 1	1494
March	1st to 10th	Day	60% 5% 8% 22% 5%	3433
	11th to 20th	Day	59% 5% 14% 14% 6% 1	3480
	21st to end	Day	61% 4 7% 19% 8% 1	3815
April	1st to 10th	Day	59% 4 10% 17% 10% 1	2276
	11th to 20th	Day	53% 5% 10% 20% 11% 2	2254
	21st to end	Day	56% 4 10% 16% 13% 1	2444
May	1st to 10th	Day	54% 5% 9% 20% 10% 2	4120
	11th to 20th	Day	54% 9% 10% 19% 7% 1	4392
	21st to end	Day	41% 8% 12% 23% 14% 2	4837
June	1st to 10th	Day	48% 6% 12% 20% 13% 1	2660
	11th to 20th	Day	46% 8% 12% 21% 12%	2660
	21st to end	Day	45% 8% 12% 22% 12%	2660
July	1st to 10th	Day	42% 7% 12% 25% 13% 1	4370
	11th to 20th	Day	41% 7% 12% 22% 17%	4365
	21st to end	Day	44% 8% 12% 22% 14% 1	4362
August	1st to 10th	Day	48% 7% 12% 22% 12%	4091
	11th to 20th	Day	52% 10% 12% 20% 5%	4083
	21st to end	Day	43% 7% 10% 30% 10% 1	4245
September	1st to 10th	Day	46% 7% 9% 25% 11% 1	2280
	11th to 20th	Day	41% 7% 11% 26% 14% 1	2228
	21st to end	Day	53% 6% 10% 20% 10% 1	2013
October	1st to 10th	Day	45% 6% 12% 23% 13% 1	3160
	11th to 20th	Day	51% 4 13% 14% 15% 4	3140
	21st to end	Day	51% 4 14% 22% 8% 1	3428
November	1st to 10th	Day	56% 5% 11% 16% 10% 2	1779
	11th to 20th	Day	65% 5% 9% 14% 5% 2	1600
	21st to end	Day	72% 4 9% 10% 4 1	1600
December	1st to 10th	Day	85% 3 5% 6% 2	2600
	11th to 20th	Day	76% 5% 9% 9% 2	2986
	21st to end	Day	76% 4 9% 7% 4	3960
January	1st to 10th	Night	84% 3 5% 5% 3	6349
	11th to 20th	Night	82% 4 8% 4 2	6010
	21st to end	Night	78% 4 6% 7% 4	6490
February	1st to 10th	Night	77% 3 8% 9% 3	2536
	11th to 20th	Night	73% 4 7% 11% 5%	2405
	21st to end	Night	70% 4 8% 12% 6% 1	1958
March	1st to 10th	Night	60% 6% 8% 19% 6%	3418
	11th to 20th	Night	64% 5% 11% 15% 5% 1	3480
	21st to end	Night	53% 5% 8% 18% 13% 2	3817
April	1st to 10th	Night	58% 5% 9% 17% 10%	1902
	11th to 20th	Night	52% 5% 11% 17% 13% 1	1875
	21st to end	Night	51% 7% 10% 18% 12% 2	1752
May	1st to 10th	Night	55% 6% 8% 19% 9% 2	2840
	11th to 20th	Night	48% 10% 14% 20% 7% 1	2504
	21st to end	Night	37% 8% 13% 23% 16% 4	2739
June	1st to 10th	Night	46% 7% 11% 23% 13% 1	1520
	11th to 20th	Night	41% 6% 14% 24% 14% 2	1520
	21st to end	Night	43% 8% 12% 25% 10% 2	1520
July	1st to 10th	Night	44% 5% 12% 22% 15% 2	2480
	11th to 20th	Night	39% 6% 14% 26% 14% 1	2472
	21st to end	Night	39% 6% 14% 24% 15% 2	2947
August	1st to 10th	Night	45% 5% 14% 28% 8% 1	2814
	11th to 20th	Night	50% 7% 13% 23% 7%	2812
	21st to end	Night	36% 8% 14% 32% 9% 1	3378
September	1st to 10th	Night	39% 7% 12% 26% 13% 2	1900
	11th to 20th	Night	38% 6% 12% 26% 17% 2	1947
	21st to end	Night	49% 8% 11% 20% 11% 1	2166
October	1st to 10th	Night	48% 6% 8% 22% 16%	3800
	11th to 20th	Night	50% 5% 11% 16% 14% 4	3779
	21st to end	Night	47% 5% 15% 23% 9% 1	4120
November	1st to 10th	Night	54% 5% 10% 20% 10% 3	2515
	11th to 20th	Night	63% 5% 11% 12% 6% 3	2800
	21st to end	Night	70% 5% 11% 11% 3	2800
December	1st to 10th	Night	82% 4 7% 5% 2	4580
	11th to 20th	Night	78% 4 6% 9% 3	5208
	21st to end	Night	77% 6% 7% 8% 3	6996

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	32% 32% 25% 9% 3	200
	11th to 20th	Day	34% 36% 22% 6% 1 1	277
	21st to end	Day	32% 29% 28% 8% 2	330
February	1st to 10th	Day	36% 32% 25% 6% 1	285
	11th to 20th	Day	34% 34% 29% 3 1	270
	21st to end	Day	41% 27% 26% 5% 1	306
March	1st to 10th	Day	33% 25% 29% 10% 3	460
	11th to 20th	Day	31% 27% 32% 7% 3	460
	21st to end	Day	37% 21% 26% 12% 3 1	506
April	1st to 10th	Day	33% 23% 27% 12% 4 1	460
	11th to 20th	Day	33% 24% 26% 8% 6% 2	452
	21st to end	Day	31% 21% 30% 14% 3 1	460
May	1st to 10th	Day	32% 18% 28% 14% 6% 1	463
	11th to 20th	Day	24% 17% 29% 21% 8% 2	487
	21st to end	Day	19% 16% 30% 22% 10% 4	529
June	1st to 10th	Day	22% 19% 29% 21% 7% 1	490
	11th to 20th	Day	19% 13% 31% 23% 13% 1	490
	21st to end	Day	20% 15% 37% 19% 7% 1	490
July	1st to 10th	Day	13% 11% 33% 23% 16% 4	485
	11th to 20th	Day	15% 10% 29% 28% 14% 4	484
	21st to end	Day	13% 11% 37% 24% 11% 4	532
August	1st to 10th	Day	14% 9% 29% 26% 15% 6%	486
	11th to 20th	Day	16% 9% 30% 24% 15% 5%	479
	21st to end	Day	17% 10% 28% 25% 13% 7%	539
September	1st to 10th	Day	18% 14% 26% 21% 15% 6%	490
	11th to 20th	Day	14% 9% 24% 23% 22% 8%	490
	21st to end	Day	22% 16% 29% 18% 12% 4	490
October	1st to 10th	Day	25% 15% 26% 18% 13% 3	490
	11th to 20th	Day	32% 20% 27% 16% 5% 1	490
	21st to end	Day	37% 20% 27% 14% 2	539
November	1st to 10th	Day	26% 23% 29% 14% 5% 2	383
	11th to 20th	Day	37% 24% 29% 9% 1 1	200
	21st to end	Day	36% 29% 30% 5% 1	200
December	1st to 10th	Day	37% 29% 28% 4 3 1	200
	11th to 20th	Day	41% 26% 28% 6% 1	200
	21st to end	Day	39% 23% 31% 5% 2	220
January	1st to 10th	Night	29% 29% 30% 11% 2	800
	11th to 20th	Night	32% 27% 29% 11% 2	800
	21st to end	Night	26% 29% 30% 14% 2	880
February	1st to 10th	Night	29% 30% 28% 12% 1	781
	11th to 20th	Night	28% 29% 32% 9% 1	743
	21st to end	Night	33% 27% 27% 11% 1	628
March	1st to 10th	Night	27% 27% 29% 14% 3	760
	11th to 20th	Night	32% 22% 26% 15% 3	760
	21st to end	Night	25% 22% 32% 16% 4 1	836
April	1st to 10th	Night	28% 21% 31% 18% 3	760
	11th to 20th	Night	29% 18% 29% 18% 5% 1	751
	21st to end	Night	25% 13% 31% 25% 6%	612
May	1st to 10th	Night	24% 13% 25% 28% 9% 1	570
	11th to 20th	Night	15% 13% 32% 33% 7%	382
	21st to end	Night	13% 11% 28% 31% 15% 1	411
June	1st to 10th	Night	16% 8% 34% 29% 12% 1	380
	11th to 20th	Night	18% 7% 30% 35% 10%	380
	21st to end	Night	17% 6% 35% 32% 10%	380
July	1st to 10th	Night	13% 4 25% 40% 16% 2	370
	11th to 20th	Night	12% 5% 28% 35% 19% 2	368
	21st to end	Night	15% 4 25% 37% 19% 1	594
August	1st to 10th	Night	13% 5% 24% 35% 21% 2	567
	11th to 20th	Night	15% 5% 21% 30% 26% 2	564
	21st to end	Night	13% 7% 27% 30% 20% 2	777
September	1st to 10th	Night	21% 6% 24% 30% 17% 2	760
	11th to 20th	Night	16% 8% 21% 28% 25% 3	760
	21st to end	Night	23% 13% 23% 24% 15% 3	760
October	1st to 10th	Night	22% 13% 27% 22% 15% 1	760
	11th to 20th	Night	30% 15% 30% 19% 6% 1	760
	21st to end	Night	35% 16% 29% 16% 3	836
November	1st to 10th	Night	26% 18% 30% 20% 7%	780
	11th to 20th	Night	31% 24% 26% 13% 5% 1	800
	21st to end	Night	32% 25% 27% 12% 4	800
December	1st to 10th	Night	35% 28% 27% 7% 3	800
	11th to 20th	Night	33% 27% 28% 11% 2	800
	21st to end	Night	34% 26% 29% 9% 1	880

Page generated at 2025-02-03 03:05:52. Version ac07

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