Lake Warren State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lake Warren State Park clear sky chart from 2005-11-06 to 2024-11-11.

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	12% 6% 2 6% 5% 5% 5% 4 7% 8% 40%	101193
	Night	12% 6% 2 6% 4 4 5% 4 6% 8% 43%	97932
Transparency	Day	39% 9% 13% 17% 16% 6%	104909
	Night	36% 8% 13% 18% 17% 8%	102355
Seeing	Day	13% 9% 23% 25% 20% 10%	15412
	Night	13% 7% 23% 33% 20% 3	25470

By Month

Percentage Cloud Cover SE (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% 6% 2 6% 4 4 4 4 6% 7% 45%	2836
	11th to 20th	Day	12% 6% 2 5% 3 3 3 3 5% 7% 50%	2840
	21st to end	Day	14% 8% 3 6% 4 4 3 3 5% 6% 44%	3124
February	1st to 10th	Day	15% 6% 2 6% 5% 4 4 4 6% 7% 41%	1769
	11th to 20th	Day	18% 6% 2 5% 3 3 4 3 5% 7% 46%	1848
	21st to end	Day	15% 7% 2 5% 4 3 4 3 5% 7% 46%	1639
March	1st to 10th	Day	20% 9% 3 8% 4 4 4 3 5% 6% 35%	3435
	11th to 20th	Day	8% 4 2 4 4 4 3 4 6% 8% 53%	3480
	21st to end	Day	18% 7% 2 5% 4 3 4 3 4 6% 43%	3815
April	1st to 10th	Day	8% 4 2 5% 5% 4 5% 4 5% 7% 51%	2090
	11th to 20th	Day	10% 6% 2 6% 5% 4 5% 3 5% 7% 48%	2204
	21st to end	Day	6% 5% 2 4 4 4 4 4 7% 8% 52%	2361
May	1st to 10th	Day	7% 6% 2 7% 5% 5% 6% 4 7% 8% 42%	4082
	11th to 20th	Day	15% 8% 3 7% 4 5% 5% 4 6% 7% 37%	4081
	21st to end	Day	7% 4 2 5% 5% 5% 6% 5% 7% 11% 44%	4476
June	1st to 10th	Day	9% 7% 3 8% 7% 7% 7% 5% 7% 10% 30%	2470
	11th to 20th	Day	7% 5% 1 5% 6% 7% 6% 6% 10% 12% 35%	2470
	21st to end	Day	7% 4 2 7% 6% 7% 7% 6% 9% 11% 32%	2470
July	1st to 10th	Day	14% 7% 3 9% 6% 6% 6% 5% 9% 10% 24%	4120
	11th to 20th	Day	5% 4 3 8% 7% 7% 7% 7% 11% 14% 26%	4120
	21st to end	Day	7% 7% 3 10% 7% 7% 9% 7% 10% 12% 21%	4466
August	1st to 10th	Day	20% 6% 3 8% 7% 7% 7% 5% 8% 9% 20%	4104
	11th to 20th	Day	8% 5% 3 7% 5% 6% 7% 5% 10% 11% 33%	4044
	21st to end	Day	8% 6% 3 8% 7% 6% 7% 6% 7% 10% 34%	4097
September	1st to 10th	Day	9% 6% 2 7% 7% 6% 7% 6% 8% 8% 34%	2090
	11th to 20th	Day	13% 7% 2 8% 6% 5% 5% 5% 7% 7% 36%	2090
	21st to end	Day	16% 7% 2 6% 4 4 4 4 6% 8% 39%	2090
October	1st to 10th	Day	11% 6% 2 7% 4 5% 4 3 5% 7% 46%	2000
	11th to 20th	Day	9% 4 2 4 3 3 3 3 4 6% 59%	1900
	21st to end	Day	8% 5% 2 5% 3 3 3 3 4 6% 57%	2090
November	1st to 10th	Day	13% 5% 2 5% 3 4 3 4 6% 5% 52%	1957
	11th to 20th	Day	14% 6% 3 5% 3 3 3 2 4 6% 51%	1838
	21st to end	Day	14% 6% 2 5% 4 3 3 3 5% 6% 50%	1710
December	1st to 10th	Day	14% 5% 2 7% 4 4 4 4 5% 7% 43%	1710
	11th to 20th	Day	15% 6% 2 4 3 3 3 3 4 6% 50%	2153
	21st to end	Day	18% 9% 3 6% 3 3 3 2 4 5% 43%	3124
January	1st to 10th	Night	15% 7% 2 5% 4 4 4 4 5% 6% 44%	4109
	11th to 20th	Night	9% 7% 2 6% 4 5% 6% 4 6% 7% 44%	4120
	21st to end	Night	14% 8% 3 6% 5% 4 4 3 4 5% 44%	4532
February	1st to 10th	Night	16% 6% 1 4 4 4 4 4 6% 6% 44%	2409
	11th to 20th	Night	16% 7% 2 6% 4 4 4 3 5% 5% 46%	2218
	21st to end	Night	12% 6% 3 6% 5% 4 3 3 6% 7% 46%	1813
March	1st to 10th	Night	21% 11% 4 7% 4 4 3 4 4 5% 34%	3418
	11th to 20th	Night	11% 5% 2 5% 4 3 4 3 5% 7% 51%	3480
	21st to end	Night	16% 5% 2 6% 4 4 4 3 5% 7% 44%	3817
April	1st to 10th	Night	10% 5% 2 4 4 3 5% 4 5% 7% 50%	2090
	11th to 20th	Night	11% 4 2 5% 3 3 3 4 6% 8% 50%	1923
	21st to end	Night	8% 4 1 4 4 3 5% 4 5% 8% 54%	1834
May	1st to 10th	Night	7% 5% 2 6% 4 4 5% 4 7% 12% 45%	2813
	11th to 20th	Night	11% 6% 2 6% 4 5% 5% 4 6% 8% 43%	2812
	21st to end	Night	6% 4 2 5% 4 4 4 4 6% 9% 53%	3079
June	1st to 10th	Night	10% 6% 2 7% 5% 5% 6% 5% 9% 13% 33%	1710
	11th to 20th	Night	7% 5% 2 6% 5% 5% 7% 5% 8% 12% 37%	1710
	21st to end	Night	6% 5% 2 6% 6% 5% 6% 6% 10% 11% 37%	1710
July	1st to 10th	Night	13% 8% 3 8% 5% 5% 6% 5% 7% 10% 28%	2840
	11th to 20th	Night	6% 6% 3 8% 7% 7% 7% 6% 9% 12% 30%	2840
	21st to end	Night	9% 8% 3 9% 7% 7% 7% 6% 9% 11% 23%	3087
August	1st to 10th	Night	20% 6% 2 6% 5% 6% 7% 5% 8% 11% 23%	2825
	11th to 20th	Night	8% 5% 3 7% 5% 6% 7% 5% 8% 11% 36%	2785
	21st to end	Night	6% 4 2 5% 3 5% 5% 5% 8% 11% 45%	3520
September	1st to 10th	Night	10% 6% 2 7% 5% 4 5% 4 8% 9% 38%	2090
	11th to 20th	Night	11% 7% 3 9% 5% 4 5% 4 6% 8% 39%	2090
	21st to end	Night	14% 6% 3 6% 5% 4 5% 4 6% 9% 39%	2090
October	1st to 10th	Night	13% 6% 2 5% 4 3 3 3 5% 6% 48%	2178
	11th to 20th	Night	11% 5% 2 5% 2 2 3 2 4 5% 58%	2280
	21st to end	Night	9% 5% 2 5% 4 4 3 3 4 6% 57%	2508
November	1st to 10th	Night	12% 6% 2 4 3 3 3 4 5% 7% 51%	2341
	11th to 20th	Night	14% 7% 2 5% 4 2 3 3 5% 5% 51%	2347
	21st to end	Night	12% 5% 2 6% 3 4 4 3 5% 7% 48%	2470
December	1st to 10th	Night	15% 5% 3 6% 4 4 5% 4 6% 7% 43%	2470
	11th to 20th	Night	17% 7% 2 5% 3 3 3 2 4 5% 49%	3042
	21st to end	Night	17% 8% 2 6% 4 4 4 3 5% 6% 40%	4532

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	36% 8% 8% 18% 21% 10%	2837
	11th to 20th	Day	33% 5% 7% 18% 26% 11%	2840
	21st to end	Day	39% 7% 6% 15% 22% 11%	3124
February	1st to 10th	Day	41% 6% 9% 18% 19% 7%	1769
	11th to 20th	Day	39% 5% 8% 16% 23% 9%	1858
	21st to end	Day	39% 6% 8% 17% 20% 11%	1639
March	1st to 10th	Day	48% 8% 9% 13% 14% 8%	3435
	11th to 20th	Day	27% 7% 11% 17% 24% 14%	3480
	21st to end	Day	42% 5% 7% 17% 22% 7%	3815
April	1st to 10th	Day	31% 7% 12% 18% 22% 10%	2090
	11th to 20th	Day	35% 6% 9% 19% 19% 12%	2204
	21st to end	Day	27% 7% 12% 25% 24% 5%	2361
May	1st to 10th	Day	34% 11% 16% 23% 13% 4	4120
	11th to 20th	Day	43% 8% 13% 19% 16% 1	4085
	21st to end	Day	28% 11% 16% 20% 21% 2	4489
June	1st to 10th	Day	45% 12% 16% 15% 10% 1	2470
	11th to 20th	Day	36% 12% 21% 22% 8% 1	2470
	21st to end	Day	40% 14% 19% 16% 9% 1	2470
July	1st to 10th	Day	50% 12% 19% 14% 3 1	4055
	11th to 20th	Day	43% 15% 29% 11% 2	4051
	21st to end	Day	51% 15% 20% 11% 3	4324
August	1st to 10th	Day	57% 11% 20% 9% 3	4091
	11th to 20th	Day	38% 13% 18% 21% 10% 1	4083
	21st to end	Day	41% 11% 15% 26% 7% 1	4097
September	1st to 10th	Day	43% 13% 16% 12% 11% 5%	2090
	11th to 20th	Day	45% 9% 12% 15% 15% 4	2090
	21st to end	Day	43% 7% 12% 17% 17% 5%	2090
October	1st to 10th	Day	40% 6% 8% 12% 24% 10%	3325
	11th to 20th	Day	16% 4 6% 12% 30% 32%	3140
	21st to end	Day	23% 5% 7% 17% 34% 15%	3428
November	1st to 10th	Day	32% 6% 10% 15% 23% 14%	1957
	11th to 20th	Day	35% 4 7% 17% 23% 13%	1838
	21st to end	Day	36% 5% 8% 21% 21% 9%	1710
December	1st to 10th	Day	39% 8% 12% 16% 17% 7%	1710
	11th to 20th	Day	35% 5% 7% 20% 25% 8%	2150
	21st to end	Day	43% 5% 6% 17% 24% 5%	3124
January	1st to 10th	Night	37% 7% 9% 15% 21% 11%	4109
	11th to 20th	Night	36% 7% 8% 17% 25% 8%	4120
	21st to end	Night	41% 7% 6% 11% 23% 11%	4532
February	1st to 10th	Night	40% 6% 9% 18% 19% 9%	2409
	11th to 20th	Night	40% 6% 7% 15% 21% 11%	2219
	21st to end	Night	38% 6% 10% 18% 16% 13%	1813
March	1st to 10th	Night	50% 9% 9% 12% 12% 7%	3418
	11th to 20th	Night	31% 7% 10% 14% 22% 15%	3480
	21st to end	Night	38% 6% 11% 18% 18% 9%	3817
April	1st to 10th	Night	31% 8% 12% 19% 20% 10%	2090
	11th to 20th	Night	30% 6% 10% 21% 21% 12%	1923
	21st to end	Night	27% 6% 14% 25% 22% 6%	1834
May	1st to 10th	Night	27% 12% 19% 26% 13% 4	2840
	11th to 20th	Night	35% 12% 16% 22% 15% 1	2813
	21st to end	Night	25% 10% 16% 28% 18% 3	3087
June	1st to 10th	Night	37% 15% 20% 19% 9% 1	1710
	11th to 20th	Night	34% 13% 20% 25% 7%	1710
	21st to end	Night	33% 17% 24% 18% 7% 1	1710
July	1st to 10th	Night	49% 10% 17% 19% 3 1	2795
	11th to 20th	Night	42% 13% 29% 13% 3	2786
	21st to end	Night	49% 16% 20% 11% 3	2988
August	1st to 10th	Night	51% 12% 24% 11% 2	2814
	11th to 20th	Night	37% 13% 22% 22% 6%	2812
	21st to end	Night	31% 10% 20% 33% 6%	3520
September	1st to 10th	Night	39% 13% 18% 16% 11% 4	2090
	11th to 20th	Night	40% 11% 16% 16% 13% 3	2090
	21st to end	Night	40% 10% 14% 18% 15% 3	2090
October	1st to 10th	Night	35% 5% 10% 16% 25% 8%	3633
	11th to 20th	Night	18% 3 5% 12% 25% 37%	3779
	21st to end	Night	23% 4 7% 18% 30% 18%	4120
November	1st to 10th	Night	31% 6% 11% 14% 24% 14%	2341
	11th to 20th	Night	36% 5% 6% 17% 23% 13%	2347
	21st to end	Night	36% 6% 9% 18% 22% 10%	2470
December	1st to 10th	Night	39% 8% 13% 16% 18% 6%	2470
	11th to 20th	Night	38% 5% 7% 16% 27% 7%	3044
	21st to end	Night	43% 6% 7% 18% 21% 5%	4532

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	14% 19% 46% 18% 3	270
	11th to 20th	Day	14% 18% 40% 19% 7% 2	270
	21st to end	Day	24% 23% 36% 13% 3	297
February	1st to 10th	Day	18% 21% 34% 21% 6%	270
	11th to 20th	Day	24% 18% 39% 16% 2	270
	21st to end	Day	18% 18% 39% 19% 5%	294
March	1st to 10th	Day	17% 16% 31% 23% 12% 1	460
	11th to 20th	Day	13% 17% 38% 22% 9% 1	460
	21st to end	Day	18% 13% 38% 21% 10% 1	506
April	1st to 10th	Day	14% 18% 30% 26% 12% 1	460
	11th to 20th	Day	12% 14% 29% 23% 16% 7%	452
	21st to end	Day	9% 10% 26% 26% 20% 9%	460
May	1st to 10th	Day	8% 13% 30% 25% 16% 9%	463
	11th to 20th	Day	13% 5% 20% 28% 23% 11%	487
	21st to end	Day	11% 4 16% 27% 25% 16%	529
June	1st to 10th	Day	10% 3 16% 30% 27% 14%	490
	11th to 20th	Day	9% 4 16% 24% 24% 22%	490
	21st to end	Day	8% 3 13% 30% 28% 19%	490
July	1st to 10th	Day	8% 3 7% 23% 34% 25%	485
	11th to 20th	Day	6% 2 5% 21% 41% 24%	484
	21st to end	Day	6% 3 9% 26% 38% 18%	532
August	1st to 10th	Day	10% 4 11% 23% 30% 21%	486
	11th to 20th	Day	9% 3 7% 22% 33% 26%	479
	21st to end	Day	13% 4 10% 24% 27% 22%	539
September	1st to 10th	Day	10% 3 12% 30% 29% 16%	490
	11th to 20th	Day	16% 5% 13% 29% 29% 8%	490
	21st to end	Day	18% 2 14% 28% 28% 10%	490
October	1st to 10th	Day	16% 5% 22% 29% 18% 10%	490
	11th to 20th	Day	10% 5% 23% 33% 20% 8%	490
	21st to end	Day	12% 7% 23% 31% 21% 5%	539
November	1st to 10th	Day	17% 8% 25% 27% 19% 5%	495
	11th to 20th	Day	20% 11% 34% 23% 10% 2	398
	21st to end	Day	14% 13% 31% 30% 11% 1	270
December	1st to 10th	Day	19% 13% 34% 25% 7% 1	270
	11th to 20th	Day	20% 15% 32% 22% 9% 1	270
	21st to end	Day	28% 11% 31% 18% 10% 2	297
January	1st to 10th	Night	16% 13% 34% 30% 6% 1	760
	11th to 20th	Night	15% 13% 32% 31% 9%	760
	21st to end	Night	20% 13% 38% 26% 3	836
February	1st to 10th	Night	18% 13% 31% 31% 7%	760
	11th to 20th	Night	19% 14% 37% 27% 3	743
	21st to end	Night	15% 15% 36% 31% 3	628
March	1st to 10th	Night	14% 11% 35% 34% 6%	760
	11th to 20th	Night	14% 13% 36% 30% 8%	760
	21st to end	Night	12% 12% 37% 31% 8%	836
April	1st to 10th	Night	12% 13% 33% 33% 9%	760
	11th to 20th	Night	12% 11% 32% 30% 14% 1	751
	21st to end	Night	9% 8% 30% 39% 14%	694
May	1st to 10th	Night	6% 8% 26% 42% 18% 1	570
	11th to 20th	Night	10% 5% 22% 39% 21% 3	561
	21st to end	Night	9% 2 16% 37% 32% 4	617
June	1st to 10th	Night	11% 2 14% 42% 27% 4	570
	11th to 20th	Night	7% 3 12% 36% 33% 9%	570
	21st to end	Night	6% 3 10% 39% 36% 6%	570
July	1st to 10th	Night	8% 2 8% 33% 41% 7%	555
	11th to 20th	Night	9% 1 4 34% 44% 8%	552
	21st to end	Night	6% 1 9% 35% 43% 5%	624
August	1st to 10th	Night	11% 2 5% 32% 42% 9%	567
	11th to 20th	Night	9% 2 6% 29% 46% 8%	564
	21st to end	Night	12% 2 9% 30% 38% 9%	807
September	1st to 10th	Night	10% 3 11% 28% 41% 6%	760
	11th to 20th	Night	14% 3 13% 32% 35% 3	760
	21st to end	Night	17% 3 13% 33% 31% 3	760
October	1st to 10th	Night	16% 5% 16% 34% 24% 5%	760
	11th to 20th	Night	12% 5% 23% 34% 24% 3	760
	21st to end	Night	11% 6% 21% 36% 25% 2	836
November	1st to 10th	Night	13% 7% 22% 36% 18% 4	780
	11th to 20th	Night	17% 9% 26% 33% 13% 1	763
	21st to end	Night	15% 7% 27% 32% 17% 1	760
December	1st to 10th	Night	17% 9% 30% 32% 11% 1	760
	11th to 20th	Night	19% 8% 29% 32% 11% 1	760
	21st to end	Night	22% 10% 29% 28% 10%	836

Page generated at 2024-11-08 06:44:51. Version ac07

Copyright © 2024 Attilla Danko.