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 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	16% 13% 5% 9% 6% 3 5% 4 5% 6% 27%	74792
	Night	15% 14% 6% 10% 7% 3 4 4 4 6% 26%	75246
Transparency	Day	57% 6% 10% 17% 9% 1	74507
	Night	59% 6% 10% 16% 8% 1	75065
Seeing	Day	26% 19% 29% 16% 8% 2	13497
	Night	25% 18% 28% 20% 8% 1	23044

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% 20% 11% 15% 10% 4 4 4 4 5% 11%	1517
	11th to 20th	Day	13% 22% 9% 17% 10% 4 3 3 3 4 13%	1665
	21st to end	Day	11% 15% 13% 18% 13% 4 6% 4 3 3 9%	1836
February	1st to 10th	Day	15% 20% 9% 15% 11% 4 5% 3 2 3 12%	1620
	11th to 20th	Day	12% 15% 10% 17% 10% 4 4 4 4 4 15%	1573
	21st to end	Day	18% 17% 6% 13% 10% 3 4 4 3 4 19%	1408
March	1st to 10th	Day	14% 14% 7% 15% 8% 4 3 3 4 4 22%	1975
	11th to 20th	Day	13% 17% 9% 9% 6% 3 4 3 4 5% 27%	1980
	21st to end	Day	18% 16% 6% 8% 7% 3 4 4 4 5% 25%	2178
April	1st to 10th	Day	16% 16% 6% 7% 5% 3 4 5% 4 6% 28%	2156
	11th to 20th	Day	18% 14% 4 5% 4 3 4 5% 5% 5% 33%	2134
	21st to end	Day	21% 13% 4 7% 5% 3 4 3 4 5% 32%	2315
May	1st to 10th	Day	20% 11% 4 7% 6% 3 5% 4 4 6% 29%	2340
	11th to 20th	Day	19% 10% 3 6% 6% 5% 5% 4 5% 6% 32%	2468
	21st to end	Day	13% 7% 3 6% 5% 4 5% 5% 6% 8% 38%	2725
June	1st to 10th	Day	18% 7% 4 6% 5% 3 5% 5% 5% 7% 36%	2520
	11th to 20th	Day	16% 7% 3 5% 5% 3 5% 5% 7% 8% 34%	2520
	21st to end	Day	16% 7% 3 5% 5% 3 5% 5% 6% 8% 37%	2520
July	1st to 10th	Day	11% 6% 3 6% 5% 4 6% 6% 6% 8% 39%	2520
	11th to 20th	Day	13% 8% 3 6% 5% 3 5% 6% 7% 10% 33%	2520
	21st to end	Day	13% 6% 3 6% 7% 5% 6% 6% 7% 9% 31%	2573
August	1st to 10th	Day	12% 6% 3 6% 6% 4 5% 6% 8% 9% 36%	2327
	11th to 20th	Day	13% 8% 4 7% 6% 5% 7% 6% 7% 9% 29%	2303
	21st to end	Day	15% 7% 3 6% 6% 4 5% 5% 5% 8% 35%	2413
September	1st to 10th	Day	18% 7% 3 7% 5% 3 4 4 6% 8% 35%	2160
	11th to 20th	Day	16% 6% 3 5% 6% 3 4 4 6% 8% 39%	2111
	21st to end	Day	18% 8% 4 6% 6% 4 5% 6% 6% 7% 30%	1908
October	1st to 10th	Day	21% 9% 4 6% 6% 3 5% 4 4 7% 31%	1800
	11th to 20th	Day	21% 15% 3 7% 7% 3 4 4 4 5% 26%	1800
	21st to end	Day	25% 19% 4 7% 5% 3 5% 3 4 5% 21%	1980
November	1st to 10th	Day	14% 18% 5% 6% 6% 4 4 4 4 5% 29%	1689
	11th to 20th	Day	16% 23% 7% 8% 5% 3 4 3 5% 7% 20%	1520
	21st to end	Day	16% 23% 9% 11% 6% 2 4 3 4 5% 17%	1520
December	1st to 10th	Day	15% 24% 13% 16% 6% 2 3 3 3 3 10%	1520
	11th to 20th	Day	16% 20% 9% 17% 7% 3 4 4 4 4 13%	1906
	21st to end	Day	20% 27% 10% 12% 7% 3 3 3 3 3 10%	2772
January	1st to 10th	Night	12% 20% 11% 16% 11% 4 5% 4 3 3 11%	2649
	11th to 20th	Night	14% 20% 10% 15% 11% 4 4 3 3 3 12%	2513
	21st to end	Night	11% 17% 11% 16% 13% 5% 6% 5% 2 3 12%	2664
February	1st to 10th	Night	15% 18% 9% 16% 12% 5% 4 3 3 4 12%	2340
	11th to 20th	Night	11% 14% 9% 18% 11% 4 6% 4 3 5% 14%	2273
	21st to end	Night	15% 15% 7% 14% 12% 3 4 3 3 4 18%	1846
March	1st to 10th	Night	11% 14% 10% 13% 9% 4 5% 4 4 5% 22%	1970
	11th to 20th	Night	15% 16% 6% 9% 7% 3 4 3 4 5% 27%	1979
	21st to end	Night	14% 16% 6% 9% 7% 3 5% 4 5% 5% 26%	2178
April	1st to 10th	Night	16% 14% 7% 7% 5% 4 4 3 5% 6% 28%	1802
	11th to 20th	Night	18% 13% 3 6% 6% 3 4 3 4 5% 35%	1775
	21st to end	Night	16% 13% 4 6% 5% 3 5% 4 5% 8% 31%	1660
May	1st to 10th	Night	18% 11% 2 5% 6% 4 5% 5% 4 7% 31%	1620
	11th to 20th	Night	13% 8% 4 7% 7% 4 5% 6% 6% 6% 36%	1423
	21st to end	Night	11% 7% 2 6% 5% 2 4 5% 6% 8% 45%	1550
June	1st to 10th	Night	13% 6% 3 6% 6% 5% 6% 5% 6% 9% 34%	1440
	11th to 20th	Night	13% 6% 3 5% 6% 4 4 5% 6% 8% 41%	1440
	21st to end	Night	14% 6% 3 6% 5% 3 6% 4 6% 6% 42%	1440
July	1st to 10th	Night	9% 5% 3 7% 5% 2 4 5% 6% 9% 45%	1440
	11th to 20th	Night	11% 4 3 6% 5% 3 5% 4 6% 9% 44%	1440
	21st to end	Night	12% 5% 2 4 5% 3 5% 6% 6% 7% 44%	1742
August	1st to 10th	Night	10% 5% 2 5% 5% 4 5% 5% 6% 7% 46%	1611
	11th to 20th	Night	13% 6% 2 6% 6% 4 5% 6% 7% 9% 37%	1598
	21st to end	Night	12% 7% 3 5% 6% 3 5% 4 6% 8% 42%	1924
September	1st to 10th	Night	16% 7% 2 5% 5% 2 4 5% 5% 7% 42%	1800
	11th to 20th	Night	14% 6% 2 5% 5% 2 4 4 4 7% 45%	1844
	21st to end	Night	18% 8% 2 6% 6% 3 4 5% 6% 6% 35%	2052
October	1st to 10th	Night	19% 7% 3 7% 5% 4 4 5% 5% 6% 36%	2160
	11th to 20th	Night	21% 12% 4 6% 6% 4 4 4 5% 7% 27%	2160
	21st to end	Night	28% 14% 4 6% 4 3 4 4 4 6% 23%	2376
November	1st to 10th	Night	15% 16% 4 6% 6% 3 4 4 4 5% 32%	2385
	11th to 20th	Night	15% 19% 6% 8% 6% 4 5% 5% 5% 6% 21%	2660
	21st to end	Night	14% 20% 9% 12% 6% 3 4 4 4 5% 18%	2660
December	1st to 10th	Night	18% 22% 11% 14% 7% 3 4 3 3 3 11%	2660
	11th to 20th	Night	16% 21% 11% 17% 7% 3 4 3 3 4 12%	3288
	21st to end	Night	20% 22% 11% 12% 9% 3 4 4 4 4 8%	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	77% 5% 7% 8% 3	1518
	11th to 20th	Day	78% 3 8% 7% 4	1665
	21st to end	Day	79% 4 7% 6% 3 1	1836
February	1st to 10th	Day	80% 4 8% 6% 2	1620
	11th to 20th	Day	74% 3 7% 12% 5%	1582
	21st to end	Day	69% 4 9% 12% 5% 1	1408
March	1st to 10th	Day	66% 4 10% 15% 6%	1978
	11th to 20th	Day	60% 4 10% 15% 8% 2	1980
	21st to end	Day	62% 4 6% 16% 10% 2	2178
April	1st to 10th	Day	58% 4 10% 17% 11% 1	2156
	11th to 20th	Day	52% 5% 10% 20% 11% 2	2134
	21st to end	Day	56% 4 10% 17% 12% 1	2315
May	1st to 10th	Day	55% 5% 9% 19% 9% 2	2340
	11th to 20th	Day	53% 6% 9% 19% 12% 1	2472
	21st to end	Day	43% 8% 15% 20% 12% 1	2725
June	1st to 10th	Day	48% 6% 12% 20% 13% 1	2520
	11th to 20th	Day	46% 8% 12% 22% 12%	2520
	21st to end	Day	45% 8% 12% 22% 13%	2520
July	1st to 10th	Day	41% 9% 11% 25% 12% 2	2450
	11th to 20th	Day	44% 8% 14% 22% 12%	2445
	21st to end	Day	47% 8% 12% 19% 12% 1	2429
August	1st to 10th	Day	42% 8% 13% 26% 10% 1	2314
	11th to 20th	Day	48% 10% 12% 22% 7%	2303
	21st to end	Day	46% 8% 11% 23% 10% 1	2413
September	1st to 10th	Day	47% 7% 10% 24% 11% 1	2160
	11th to 20th	Day	43% 7% 11% 25% 14% 1	2111
	21st to end	Day	51% 6% 10% 21% 11% 1	1908
October	1st to 10th	Day	54% 6% 11% 16% 11% 2	1800
	11th to 20th	Day	60% 5% 12% 15% 8% 1	1800
	21st to end	Day	66% 4 9% 12% 7% 1	1980
November	1st to 10th	Day	57% 5% 11% 15% 10% 2	1689
	11th to 20th	Day	65% 5% 9% 13% 6% 2	1520
	21st to end	Day	71% 4 9% 11% 4 1	1520
December	1st to 10th	Day	80% 4 6% 8% 3	1520
	11th to 20th	Day	76% 4 10% 8% 2 1	1906
	21st to end	Day	80% 5% 7% 7% 1	2772
January	1st to 10th	Night	78% 4 7% 7% 4	2649
	11th to 20th	Night	78% 4 9% 6% 3 1	2513
	21st to end	Night	78% 4 6% 8% 3 1	2664
February	1st to 10th	Night	78% 3 8% 7% 3	2340
	11th to 20th	Night	73% 4 7% 10% 5%	2275
	21st to end	Night	71% 3 7% 12% 6% 1	1846
March	1st to 10th	Night	66% 4 8% 16% 5% 1	1980
	11th to 20th	Night	60% 5% 9% 16% 8% 1	1980
	21st to end	Night	60% 4 7% 14% 12% 3	2178
April	1st to 10th	Night	58% 5% 10% 17% 10%	1802
	11th to 20th	Night	52% 5% 11% 17% 14% 1	1775
	21st to end	Night	52% 7% 9% 18% 12% 2	1660
May	1st to 10th	Night	53% 7% 9% 19% 11% 2	1620
	11th to 20th	Night	47% 7% 9% 23% 12% 1	1424
	21st to end	Night	37% 8% 15% 23% 15% 2	1551
June	1st to 10th	Night	45% 7% 11% 23% 13% 1	1440
	11th to 20th	Night	41% 6% 13% 23% 14% 2	1440
	21st to end	Night	42% 8% 12% 26% 10% 2	1440
July	1st to 10th	Night	36% 7% 13% 23% 18% 2	1400
	11th to 20th	Night	37% 7% 12% 27% 16% 1	1392
	21st to end	Night	37% 8% 15% 24% 15% 1	1645
August	1st to 10th	Night	36% 7% 16% 31% 9% 1	1600
	11th to 20th	Night	41% 9% 15% 25% 10%	1598
	21st to end	Night	38% 9% 14% 26% 11% 2	1924
September	1st to 10th	Night	40% 8% 13% 25% 12% 2	1800
	11th to 20th	Night	38% 6% 12% 27% 16% 2	1844
	21st to end	Night	47% 8% 12% 21% 12% 1	2052
October	1st to 10th	Night	49% 6% 11% 19% 14% 1	2160
	11th to 20th	Night	56% 7% 13% 16% 9% 1	2160
	21st to end	Night	63% 5% 10% 14% 6% 2	2376
November	1st to 10th	Night	54% 5% 10% 19% 10% 3	2385
	11th to 20th	Night	62% 5% 11% 12% 6% 3	2660
	21st to end	Night	69% 5% 11% 12% 3	2660
December	1st to 10th	Night	80% 4 7% 8% 2	2660
	11th to 20th	Night	78% 4 8% 8% 2	3288
	21st to end	Night	80% 6% 8% 6% 1	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	31% 32% 26% 9% 3	180
	11th to 20th	Day	32% 37% 22% 6% 2 1	249
	21st to end	Day	29% 33% 27% 7% 3	282
February	1st to 10th	Day	39% 34% 24% 4	240
	11th to 20th	Day	35% 35% 28% 3	240
	21st to end	Day	42% 27% 26% 5% 1	274
March	1st to 10th	Day	34% 26% 28% 9% 3	420
	11th to 20th	Day	29% 27% 33% 7% 3	420
	21st to end	Day	36% 21% 26% 13% 3 1	462
April	1st to 10th	Day	33% 23% 27% 12% 4 1	420
	11th to 20th	Day	32% 23% 26% 9% 7% 2	412
	21st to end	Day	30% 21% 30% 14% 4 1	420
May	1st to 10th	Day	33% 18% 27% 14% 6% 1	423
	11th to 20th	Day	26% 16% 29% 20% 7% 2	447
	21st to end	Day	19% 16% 28% 22% 10% 4	485
June	1st to 10th	Day	22% 18% 30% 22% 8% 1	450
	11th to 20th	Day	21% 13% 31% 22% 12% 1	450
	21st to end	Day	19% 15% 37% 20% 8% 2	450
July	1st to 10th	Day	13% 10% 32% 23% 18% 5%	445
	11th to 20th	Day	15% 10% 28% 29% 14% 5%	444
	21st to end	Day	13% 11% 37% 24% 10% 3	488
August	1st to 10th	Day	12% 9% 29% 27% 16% 7%	446
	11th to 20th	Day	16% 8% 31% 25% 16% 5%	439
	21st to end	Day	17% 10% 29% 25% 13% 7%	495
September	1st to 10th	Day	18% 13% 26% 21% 15% 6%	450
	11th to 20th	Day	16% 10% 26% 22% 19% 8%	450
	21st to end	Day	20% 16% 28% 19% 13% 4	450
October	1st to 10th	Day	25% 14% 26% 18% 13% 4	450
	11th to 20th	Day	32% 21% 27% 16% 4 1	450
	21st to end	Day	39% 20% 25% 14% 2	495
November	1st to 10th	Day	25% 23% 29% 14% 6% 2	353
	11th to 20th	Day	38% 23% 27% 10% 1 1	180
	21st to end	Day	34% 28% 32% 6% 1	180
December	1st to 10th	Day	36% 30% 26% 4 3 1	180
	11th to 20th	Day	41% 24% 28% 6% 1	180
	21st to end	Day	41% 25% 30% 4 1	198
January	1st to 10th	Night	29% 29% 28% 11% 3	760
	11th to 20th	Night	32% 26% 29% 11% 2	760
	21st to end	Night	25% 29% 31% 14% 2	820
February	1st to 10th	Night	30% 30% 28% 11% 1	720
	11th to 20th	Night	28% 29% 32% 9% 1	703
	21st to end	Night	33% 27% 27% 11% 1	592
March	1st to 10th	Night	27% 27% 30% 14% 3	720
	11th to 20th	Night	32% 22% 27% 16% 3	720
	21st to end	Night	25% 21% 33% 16% 5% 1	792
April	1st to 10th	Night	27% 21% 31% 18% 3	720
	11th to 20th	Night	29% 17% 29% 18% 6% 1	711
	21st to end	Night	26% 12% 32% 24% 6%	580
May	1st to 10th	Night	24% 12% 26% 28% 9% 1	540
	11th to 20th	Night	15% 13% 32% 33% 6%	362
	21st to end	Night	13% 11% 29% 31% 15% 2	389
June	1st to 10th	Night	15% 8% 34% 29% 12% 1	360
	11th to 20th	Night	18% 7% 30% 35% 10%	360
	21st to end	Night	15% 6% 37% 33% 10%	360
July	1st to 10th	Night	13% 3 25% 41% 17% 2	350
	11th to 20th	Night	12% 4 28% 35% 19% 2	348
	21st to end	Night	14% 4 25% 37% 18% 1	562
August	1st to 10th	Night	13% 5% 24% 35% 21% 2	537
	11th to 20th	Night	15% 4 21% 31% 26% 3	534
	21st to end	Night	14% 7% 27% 30% 20% 2	736
September	1st to 10th	Night	20% 7% 24% 30% 17% 2	720
	11th to 20th	Night	16% 8% 22% 28% 23% 3	720
	21st to end	Night	21% 13% 23% 25% 16% 3	720
October	1st to 10th	Night	22% 14% 27% 21% 15% 1	720
	11th to 20th	Night	31% 15% 31% 18% 5%	720
	21st to end	Night	37% 16% 29% 15% 3	792
November	1st to 10th	Night	26% 17% 30% 20% 7%	740
	11th to 20th	Night	30% 24% 26% 13% 5% 1	760
	21st to end	Night	31% 24% 28% 12% 4	760
December	1st to 10th	Night	35% 28% 27% 7% 3	760
	11th to 20th	Night	32% 27% 28% 11% 2	760
	21st to end	Night	34% 27% 29% 9% 1	836

Page generated at 2024-01-24 09:37:29. Version ac07

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