Lesterville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lesterville clear sky chart from 2005-11-06 to 2024-11-10.

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	11% 7% 3 7% 4 4 4 4 5% 7% 45%	105118
	Night	10% 7% 2 6% 4 4 4 3 5% 7% 47%	102654
Transparency	Day	38% 7% 14% 25% 15% 2	104871
	Night	36% 6% 14% 25% 17% 2	102491
Seeing	Day	14% 9% 30% 31% 14% 2	15926
	Night	13% 8% 34% 35% 10% 1	25805

By Month

Percentage Cloud Cover SW (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	9% 13% 5% 11% 7% 7% 6% 5% 5% 4 28%	2538
	11th to 20th	Day	6% 14% 5% 11% 6% 5% 7% 5% 6% 6% 30%	2571
	21st to end	Day	6% 11% 6% 13% 7% 4 5% 4 5% 5% 34%	3135
February	1st to 10th	Day	10% 12% 4 8% 7% 6% 6% 4 5% 6% 32%	1710
	11th to 20th	Day	9% 11% 5% 8% 5% 5% 4 4 4 7% 39%	1740
	21st to end	Day	10% 11% 3 8% 6% 5% 5% 3 5% 7% 36%	1570
March	1st to 10th	Day	10% 8% 4 8% 4 3 3 3 4 6% 46%	3254
	11th to 20th	Day	10% 7% 3 7% 4 4 3 3 4 7% 48%	3480
	21st to end	Day	24% 11% 4 11% 5% 4 4 3 4 5% 24%	3814
April	1st to 10th	Day	16% 7% 3 7% 4 4 4 4 5% 6% 40%	2154
	11th to 20th	Day	19% 8% 3 5% 4 4 4 3 5% 6% 40%	2439
	21st to end	Day	20% 8% 2 6% 3 4 4 3 4 6% 39%	2470
May	1st to 10th	Day	15% 7% 3 6% 5% 4 5% 4 6% 7% 37%	4120
	11th to 20th	Day	11% 5% 2 6% 4 4 4 3 5% 6% 50%	4082
	21st to end	Day	17% 6% 2 6% 4 4 4 3 5% 7% 41%	4616
June	1st to 10th	Day	11% 4 2 4 4 4 4 4 5% 7% 50%	2802
	11th to 20th	Day	13% 6% 2 4 3 3 4 4 6% 8% 47%	2850
	21st to end	Day	7% 5% 2 5% 3 4 5% 4 6% 9% 51%	2850
July	1st to 10th	Day	10% 5% 2 5% 4 4 5% 4 7% 9% 45%	4507
	11th to 20th	Day	7% 4 2 4 3 4 3 4 5% 7% 57%	4430
	21st to end	Day	4 3 1 4 3 4 3 4 6% 9% 57%	4475
August	1st to 10th	Day	8% 5% 2 5% 4 5% 4 4 6% 9% 48%	4103
	11th to 20th	Day	17% 8% 2 6% 4 4 4 4 5% 7% 40%	4041
	21st to end	Day	7% 4 2 5% 3 4 4 3 5% 7% 55%	4532
September	1st to 10th	Day	14% 5% 1 5% 2 4 3 3 4 5% 54%	2180
	11th to 20th	Day	8% 4 1 4 4 3 3 3 5% 7% 58%	2090
	21st to end	Day	11% 4 2 4 3 3 3 3 5% 6% 57%	2090
October	1st to 10th	Day	9% 3 1 3 3 2 3 2 4 4 66%	3322
	11th to 20th	Day	7% 4 2 4 3 3 4 3 4 7% 59%	3140
	21st to end	Day	10% 7% 2 6% 3 4 4 3 6% 8% 46%	3228
November	1st to 10th	Day	9% 7% 2 5% 4 4 5% 4 6% 7% 46%	1754
	11th to 20th	Day	9% 6% 2 8% 6% 4 4 3 5% 7% 45%	1669
	21st to end	Day	11% 8% 2 7% 3 4 3 4 5% 8% 45%	1520
December	1st to 10th	Day	8% 10% 3 8% 6% 4 4 4 6% 8% 40%	1520
	11th to 20th	Day	8% 11% 4 8% 4 5% 5% 4 5% 6% 40%	1812
	21st to end	Day	15% 11% 5% 15% 6% 4 3 3 5% 5% 29%	2510
January	1st to 10th	Night	9% 12% 4 12% 10% 6% 6% 5% 5% 6% 26%	4417
	11th to 20th	Night	4 12% 5% 8% 5% 7% 8% 5% 8% 6% 32%	4396
	21st to end	Night	5% 11% 6% 12% 5% 5% 5% 4 5% 7% 35%	4532
February	1st to 10th	Night	10% 10% 4 9% 6% 5% 4 3 5% 6% 39%	2470
	11th to 20th	Night	8% 11% 4 8% 4 3 4 4 5% 6% 43%	2343
	21st to end	Night	10% 8% 3 6% 5% 5% 4 3 6% 4 45%	1884
March	1st to 10th	Night	10% 7% 2 5% 4 3 4 3 5% 7% 51%	3606
	11th to 20th	Night	10% 7% 2 5% 4 4 3 3 4 8% 51%	3480
	21st to end	Night	20% 10% 2 9% 6% 5% 4 3 5% 6% 30%	3817
April	1st to 10th	Night	14% 8% 2 6% 3 4 4 3 6% 7% 42%	2023
	11th to 20th	Night	15% 8% 3 5% 4 3 4 4 5% 6% 43%	1689
	21st to end	Night	16% 6% 2 6% 4 4 4 4 6% 6% 42%	1710
May	1st to 10th	Night	17% 6% 2 5% 4 4 4 3 5% 7% 46%	2850
	11th to 20th	Night	10% 4 2 5% 3 3 5% 4 6% 9% 51%	2823
	21st to end	Night	15% 7% 2 5% 4 3 4 3 5% 9% 44%	2956
June	1st to 10th	Night	7% 4 2 4 4 4 4 3 6% 9% 55%	1374
	11th to 20th	Night	8% 5% 1 5% 4 3 3 4 6% 9% 52%	1330
	21st to end	Night	6% 2 2 4 3 3 3 4 6% 8% 58%	1330
July	1st to 10th	Night	8% 4 2 5% 4 3 3 4 6% 8% 52%	2458
	11th to 20th	Night	5% 3 1 4 3 3 3 3 5% 8% 63%	2540
	21st to end	Night	2 3 1 4 3 3 4 3 7% 10% 60%	3087
August	1st to 10th	Night	7% 5% 2 5% 4 4 4 4 6% 9% 50%	2836
	11th to 20th	Night	10% 6% 2 5% 3 4 4 4 6% 7% 48%	2798
	21st to end	Night	6% 4 2 4 3 4 4 4 5% 9% 55%	3135
September	1st to 10th	Night	8% 4 1 5% 4 3 4 3 4 6% 59%	1996
	11th to 20th	Night	8% 4 2 4 3 3 3 3 5% 7% 60%	2090
	21st to end	Night	8% 4 1 4 3 2 3 3 3 6% 62%	2090
October	1st to 10th	Night	10% 3 1 2 2 1 1 2 3 4 71%	3605
	11th to 20th	Night	8% 4 1 3 3 3 3 2 5% 7% 62%	3779
	21st to end	Night	11% 6% 2 5% 4 4 4 3 5% 8% 48%	4323
November	1st to 10th	Night	9% 4 2 5% 4 3 4 3 5% 7% 54%	2529
	11th to 20th	Night	8% 7% 2 7% 5% 4 4 3 6% 7% 48%	2508
	21st to end	Night	9% 7% 2 6% 3 4 3 4 6% 7% 49%	2660
December	1st to 10th	Night	9% 9% 3 8% 5% 5% 3 4 4 7% 43%	2660
	11th to 20th	Night	7% 8% 3 8% 4 4 4 4 6% 7% 45%	3378
	21st to end	Night	17% 11% 4 13% 5% 4 4 3 4 5% 31%	5152

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	54% 8% 14% 16% 8%	2539
	11th to 20th	Day	52% 5% 13% 22% 7%	2571
	21st to end	Day	50% 7% 19% 15% 8%	3135
February	1st to 10th	Day	51% 8% 14% 17% 9% 1	1710
	11th to 20th	Day	46% 6% 12% 22% 12% 2	1749
	21st to end	Day	47% 6% 14% 20% 11% 2	1570
March	1st to 10th	Day	38% 8% 11% 29% 14% 1	3254
	11th to 20th	Day	36% 7% 11% 29% 14% 3	3480
	21st to end	Day	62% 7% 15% 13% 3 1	3814
April	1st to 10th	Day	44% 5% 13% 25% 12% 1	2154
	11th to 20th	Day	44% 7% 12% 21% 14% 2	2442
	21st to end	Day	45% 7% 12% 23% 12%	2470
May	1st to 10th	Day	41% 9% 13% 23% 15%	4120
	11th to 20th	Day	33% 8% 12% 27% 17% 3	4086
	21st to end	Day	41% 7% 13% 25% 13% 1	4616
June	1st to 10th	Day	32% 7% 17% 29% 12% 2	2802
	11th to 20th	Day	35% 7% 15% 23% 16% 3	2850
	21st to end	Day	28% 8% 17% 30% 15% 3	2850
July	1st to 10th	Day	34% 7% 19% 26% 13% 1	4438
	11th to 20th	Day	26% 6% 12% 33% 19% 4	4355
	21st to end	Day	22% 7% 18% 28% 21% 4	4333
August	1st to 10th	Day	32% 7% 15% 30% 14% 3	4090
	11th to 20th	Day	44% 7% 13% 26% 10% 1	4080
	21st to end	Day	28% 7% 17% 26% 19% 3	4531
September	1st to 10th	Day	32% 6% 11% 28% 19% 3	2180
	11th to 20th	Day	26% 6% 16% 33% 18% 1	2090
	21st to end	Day	28% 6% 11% 31% 22% 3	2090
October	1st to 10th	Day	23% 3 8% 24% 38% 4	3322
	11th to 20th	Day	26% 4 15% 29% 20% 5%	3140
	21st to end	Day	35% 5% 13% 25% 19% 3	3228
November	1st to 10th	Day	35% 6% 18% 25% 14% 2	1754
	11th to 20th	Day	38% 6% 16% 24% 14% 1	1669
	21st to end	Day	39% 4 16% 26% 13% 1	1520
December	1st to 10th	Day	41% 6% 18% 23% 10% 2	1520
	11th to 20th	Day	44% 7% 20% 24% 6%	1809
	21st to end	Day	56% 6% 12% 21% 5% 1	2510
January	1st to 10th	Night	55% 7% 13% 17% 7% 1	4417
	11th to 20th	Night	47% 8% 15% 22% 7% 2	4396
	21st to end	Night	47% 8% 17% 20% 9% 1	4532
February	1st to 10th	Night	46% 6% 15% 21% 11% 1	2470
	11th to 20th	Night	42% 5% 15% 22% 12% 4	2344
	21st to end	Night	41% 5% 13% 25% 13% 3	1884
March	1st to 10th	Night	31% 6% 13% 25% 22% 2	3606
	11th to 20th	Night	32% 5% 10% 29% 20% 3	3480
	21st to end	Night	53% 9% 16% 17% 5% 1	3817
April	1st to 10th	Night	40% 7% 14% 24% 14% 1	2023
	11th to 20th	Night	41% 5% 10% 22% 20% 2	1689
	21st to end	Night	41% 8% 12% 24% 14% 2	1710
May	1st to 10th	Night	36% 7% 15% 20% 18% 3	2850
	11th to 20th	Night	29% 8% 13% 26% 22% 3	2824
	21st to end	Night	38% 6% 13% 26% 15% 1	2957
June	1st to 10th	Night	26% 8% 16% 28% 19% 3	1374
	11th to 20th	Night	28% 6% 16% 24% 21% 4	1330
	21st to end	Night	22% 7% 16% 32% 20% 3	1330
July	1st to 10th	Night	30% 5% 22% 26% 13% 4	2418
	11th to 20th	Night	20% 5% 14% 37% 19% 5%	2492
	21st to end	Night	17% 8% 18% 31% 22% 4	2990
August	1st to 10th	Night	29% 7% 16% 30% 16% 2	2826
	11th to 20th	Night	34% 7% 15% 28% 15% 2	2825
	21st to end	Night	27% 7% 17% 24% 22% 4	3135
September	1st to 10th	Night	26% 6% 12% 28% 23% 5%	1996
	11th to 20th	Night	25% 5% 13% 33% 21% 2	2090
	21st to end	Night	24% 5% 10% 31% 25% 4	2090
October	1st to 10th	Night	20% 3 6% 19% 47% 5%	3605
	11th to 20th	Night	23% 4 11% 32% 26% 5%	3779
	21st to end	Night	35% 4 13% 27% 19% 1	4323
November	1st to 10th	Night	30% 5% 14% 25% 21% 4	2529
	11th to 20th	Night	35% 6% 14% 25% 18% 3	2508
	21st to end	Night	33% 6% 15% 28% 17% 1	2660
December	1st to 10th	Night	41% 5% 15% 27% 11% 1	2660
	11th to 20th	Night	37% 7% 18% 31% 7%	3380
	21st to end	Night	55% 5% 13% 20% 7%	5152

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	17% 11% 27% 31% 10% 3	270
	11th to 20th	Day	15% 13% 36% 29% 7%	270
	21st to end	Day	14% 9% 40% 24% 11% 2	297
February	1st to 10th	Day	11% 19% 37% 29% 5%	270
	11th to 20th	Day	15% 12% 41% 24% 7% 1	270
	21st to end	Day	16% 14% 37% 28% 4	225
March	1st to 10th	Day	14% 12% 41% 28% 3 2	270
	11th to 20th	Day	19% 9% 37% 23% 11% 1	270
	21st to end	Day	27% 11% 32% 23% 5% 2	297
April	1st to 10th	Day	22% 16% 38% 19% 4	334
	11th to 20th	Day	22% 18% 27% 27% 6%	640
	21st to end	Day	23% 13% 29% 23% 9% 3	650
May	1st to 10th	Day	17% 14% 30% 27% 10% 1	653
	11th to 20th	Day	17% 10% 30% 24% 17% 2	675
	21st to end	Day	18% 10% 29% 29% 12% 3	734
June	1st to 10th	Day	9% 8% 26% 32% 22% 5%	680
	11th to 20th	Day	13% 7% 34% 29% 15% 2	680
	21st to end	Day	10% 6% 28% 37% 18% 2	680
July	1st to 10th	Day	7% 3 22% 35% 28% 5%	671
	11th to 20th	Day	6% 3 24% 43% 20% 3	668
	21st to end	Day	5% 3 23% 45% 20% 4	739
August	1st to 10th	Day	8% 3 22% 41% 22% 3	676
	11th to 20th	Day	11% 3 22% 37% 22% 4	665
	21st to end	Day	7% 3 27% 36% 22% 4	748
September	1st to 10th	Day	14% 5% 27% 34% 17% 3	390
	11th to 20th	Day	7% 5% 36% 31% 17% 4	300
	21st to end	Day	15% 11% 29% 26% 14% 4	300
October	1st to 10th	Day	19% 6% 26% 29% 16% 3	300
	11th to 20th	Day	15% 15% 35% 24% 10% 2	300
	21st to end	Day	18% 15% 35% 22% 8% 2	330
November	1st to 10th	Day	18% 10% 34% 25% 9% 4	297
	11th to 20th	Day	14% 15% 38% 27% 6%	270
	21st to end	Day	19% 18% 28% 24% 11%	270
December	1st to 10th	Day	13% 10% 37% 30% 9% 2	270
	11th to 20th	Day	14% 11% 39% 27% 9%	270
	21st to end	Day	21% 13% 31% 29% 6%	297
January	1st to 10th	Night	12% 10% 36% 33% 7% 1	950
	11th to 20th	Night	11% 14% 34% 32% 7% 1	950
	21st to end	Night	14% 8% 39% 30% 8%	1045
February	1st to 10th	Night	14% 11% 39% 29% 6%	950
	11th to 20th	Night	12% 12% 38% 33% 5%	869
	21st to end	Night	14% 8% 38% 31% 9% 1	628
March	1st to 10th	Night	12% 9% 43% 30% 6%	684
	11th to 20th	Night	14% 9% 40% 30% 6%	570
	21st to end	Night	18% 9% 40% 27% 6%	627
April	1st to 10th	Night	16% 14% 38% 28% 3	570
	11th to 20th	Night	16% 14% 36% 27% 7%	563
	21st to end	Night	17% 10% 38% 27% 8% 1	570
May	1st to 10th	Night	17% 9% 35% 30% 9%	570
	11th to 20th	Night	15% 9% 29% 36% 12%	561
	21st to end	Night	17% 5% 34% 34% 9%	617
June	1st to 10th	Night	9% 5% 27% 41% 17% 1	570
	11th to 20th	Night	11% 3 32% 42% 12% 1	570
	21st to end	Night	7% 3 26% 47% 17%	570
July	1st to 10th	Night	5% 2 21% 46% 25% 1	555
	11th to 20th	Night	5% 1 20% 55% 17%	552
	21st to end	Night	4 2 23% 54% 17%	624
August	1st to 10th	Night	7% 3 22% 48% 18% 1	567
	11th to 20th	Night	9% 4 23% 44% 21%	564
	21st to end	Night	6% 2 28% 45% 18% 1	627
September	1st to 10th	Night	10% 4 27% 41% 16% 2	570
	11th to 20th	Night	8% 3 33% 39% 14% 3	570
	21st to end	Night	10% 6% 35% 35% 14% 1	570
October	1st to 10th	Night	20% 7% 29% 32% 11% 1	643
	11th to 20th	Night	15% 10% 36% 30% 8%	760
	21st to end	Night	16% 11% 33% 31% 9%	951
November	1st to 10th	Night	12% 9% 36% 34% 9% 1	973
	11th to 20th	Night	12% 11% 37% 32% 8%	950
	21st to end	Night	12% 10% 36% 33% 8%	950
December	1st to 10th	Night	13% 10% 39% 32% 6%	950
	11th to 20th	Night	14% 7% 37% 33% 9%	950
	21st to end	Night	21% 9% 34% 29% 6%	1045

Page generated at 2024-11-07 05:55:48. Version ac07

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