Red Feather Lakes
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Red Feather Lakes clear sky chart from 2005-11-06 to 2024-10-25.

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	3 6% 2 6% 4 4 5% 4 7% 8% 50%	101340
	Night	2 5% 2 5% 3 3 4 3 6% 8% 59%	97672
Transparency	Day	28% 7% 12% 23% 21% 8%	101085
	Night	22% 6% 14% 28% 22% 8%	97518
Seeing	Day	17% 25% 31% 19% 7% 2	15628
	Night	16% 27% 26% 21% 9% 1	25617

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	2 2 7% 5% 4 4 3 5% 8% 59%	2538
	11th to 20th	Day	3 2 7% 4 5% 5% 5% 7% 12% 51%	2586
	21st to end	Day	5% 3 6% 4 3 4 3 5% 8% 58%	3146
February	1st to 10th	Day	5% 3 7% 5% 3 4 4 7% 8% 53%	1710
	11th to 20th	Day	4 2 6% 5% 3 5% 4 7% 10% 54%	1771
	21st to end	Day	6% 3 6% 4 4 4 4 7% 8% 55%	1570
March	1st to 10th	Day	1 6% 4 8% 4 3 5% 4 6% 8% 51%	3130
	11th to 20th	Day	1 12% 4 8% 4 5% 5% 4 7% 7% 44%	3490
	21st to end	Day	2 9% 2 6% 4 4 6% 5% 8% 10% 45%	4028
April	1st to 10th	Day	3 7% 3 6% 4 4 4 4 7% 8% 50%	2280
	11th to 20th	Day	7% 10% 4 8% 4 4 5% 3 8% 8% 40%	2251
	21st to end	Day	6% 10% 3 8% 6% 5% 5% 4 7% 8% 38%	2280
May	1st to 10th	Day	7% 13% 3 7% 5% 5% 5% 4 7% 8% 36%	4135
	11th to 20th	Day	7% 8% 3 6% 5% 6% 6% 5% 7% 9% 40%	4388
	21st to end	Day	4 5% 1 5% 4 5% 6% 6% 9% 9% 45%	4825
June	1st to 10th	Day	4 4 2 4 4 6% 6% 7% 8% 9% 45%	2660
	11th to 20th	Day	6% 4 2 5% 3 5% 5% 5% 6% 8% 52%	2660
	21st to end	Day	2 4 2 5% 5% 5% 5% 5% 7% 9% 50%	2660
July	1st to 10th	Day	4 3 2 5% 4 5% 6% 5% 7% 7% 52%	4430
	11th to 20th	Day	2 3 2 6% 6% 7% 7% 6% 8% 9% 46%	4430
	21st to end	Day	4 4 2 6% 4 5% 5% 5% 7% 9% 48%	4740
August	1st to 10th	Day	5% 6% 2 6% 5% 6% 6% 6% 8% 10% 39%	4092
	11th to 20th	Day	3 4 2 7% 4 5% 6% 5% 7% 9% 49%	3818
	21st to end	Day	4 4 2 5% 5% 4 5% 4 6% 8% 52%	4180
September	1st to 10th	Day	5% 5% 2 4 4 4 4 3 5% 6% 58%	2280
	11th to 20th	Day	6% 3 2 5% 3 4 4 4 5% 7% 56%	2280
	21st to end	Day	6% 6% 2 4 2 3 2 2 4 6% 62%	2066
October	1st to 10th	Day	5% 7% 2 4 3 3 5% 4 5% 6% 57%	1900
	11th to 20th	Day	2 4 1 4 3 3 3 3 5% 7% 62%	1900
	21st to end	Day	3 6% 2 4 3 3 4 3 5% 6% 61%	1963
November	1st to 10th	Day	2 4 1 3 4 2 4 3 6% 7% 66%	1673
	11th to 20th	Day	1 5% 2 3 2 3 3 3 5% 9% 63%	1710
	21st to end	Day	4 2 5% 5% 4 5% 2 5% 8% 59%	1530
December	1st to 10th	Day	4 2 5% 3 3 3 3 6% 9% 59%	1520
	11th to 20th	Day	2 6% 3 4 3 3 3 3 8% 10% 55%	1926
	21st to end	Day	1 5% 4 9% 4 4 4 3 5% 7% 55%	2794
January	1st to 10th	Night	3 2 7% 4 3 4 4 6% 8% 56%	4417
	11th to 20th	Night	2 1 4 3 4 4 4 6% 8% 63%	4398
	21st to end	Night	1 5% 3 6% 3 3 3 3 4 8% 61%	4521
February	1st to 10th	Night	4 2 6% 3 4 4 3 6% 8% 59%	2470
	11th to 20th	Night	4 2 5% 4 3 3 3 6% 8% 61%	2295
	21st to end	Night	7% 3 5% 3 4 3 3 5% 7% 60%	1884
March	1st to 10th	Night	5% 3 7% 4 3 3 3 6% 7% 58%	3718
	11th to 20th	Night	1 11% 4 6% 3 2 2 2 4 6% 57%	3490
	21st to end	Night	2 7% 3 6% 4 4 4 3 6% 9% 54%	3617
April	1st to 10th	Night	2 6% 2 5% 5% 4 4 3 6% 7% 56%	1900
	11th to 20th	Night	5% 8% 2 7% 3 3 3 4 5% 8% 52%	1877
	21st to end	Night	8% 9% 2 5% 3 3 3 3 6% 8% 49%	1900
May	1st to 10th	Night	6% 9% 2 5% 4 5% 5% 3 5% 7% 50%	2815
	11th to 20th	Night	7% 8% 2 4 4 3 4 4 6% 8% 50%	2517
	21st to end	Night	4 5% 2 4 3 4 4 3 7% 8% 57%	2762
June	1st to 10th	Night	3 3 1 3 2 3 4 4 7% 9% 59%	1520
	11th to 20th	Night	4 3 1 3 2 3 5% 4 5% 8% 61%	1520
	21st to end	Night	4 3 2 3 2 3 3 4 6% 8% 62%	1520
July	1st to 10th	Night	3 3 1 4 3 4 3 3 5% 7% 62%	2540
	11th to 20th	Night	1 3 1 3 3 3 5% 4 7% 11% 58%	2540
	21st to end	Night	2 3 2 4 3 4 4 4 7% 7% 60%	2819
August	1st to 10th	Night	5% 7% 1 4 3 3 4 4 7% 11% 50%	2847
	11th to 20th	Night	2 3 2 5% 4 4 5% 4 7% 9% 54%	3021
	21st to end	Night	3 3 1 3 4 4 4 3 7% 9% 59%	3487
September	1st to 10th	Night	5% 4 1 4 3 3 4 3 4 7% 61%	1900
	11th to 20th	Night	6% 3 1 3 2 3 3 2 5% 7% 65%	1900
	21st to end	Night	5% 3 1 3 3 3 3 3 4 7% 65%	2112
October	1st to 10th	Night	4 6% 2 5% 2 2 3 2 5% 6% 62%	2280
	11th to 20th	Night	3 4 1 3 3 2 2 2 5% 7% 68%	2280
	21st to end	Night	3 7% 3 5% 3 3 2 2 4 8% 60%	2480
November	1st to 10th	Night	2 3 1 3 3 3 3 3 6% 7% 68%	2405
	11th to 20th	Night	1 4 2 3 3 2 3 3 5% 8% 66%	2470
	21st to end	Night	1 4 2 6% 3 3 3 4 5% 7% 61%	2646
December	1st to 10th	Night	1 3 2 4 2 3 4 3 6% 7% 64%	2660
	11th to 20th	Night	1 6% 2 4 3 3 3 4 6% 9% 59%	3271
	21st to end	Night	1 5% 3 6% 4 3 4 3 6% 8% 57%	4873

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	24% 5% 17% 24% 25% 5%	2539
	11th to 20th	Day	23% 8% 21% 26% 19% 3	2586
	21st to end	Day	22% 8% 15% 31% 19% 5%	3146
February	1st to 10th	Day	27% 7% 18% 26% 19% 4	1710
	11th to 20th	Day	23% 6% 16% 28% 21% 5%	1780
	21st to end	Day	25% 6% 14% 26% 23% 6%	1570
March	1st to 10th	Day	30% 5% 9% 27% 25% 4	3130
	11th to 20th	Day	34% 10% 12% 29% 12% 2	3490
	21st to end	Day	29% 8% 15% 34% 13% 2	4028
April	1st to 10th	Day	29% 7% 15% 25% 17% 7%	2280
	11th to 20th	Day	39% 5% 13% 23% 17% 4	2254
	21st to end	Day	40% 7% 10% 28% 14% 1	2280
May	1st to 10th	Day	41% 7% 10% 20% 17% 5%	4135
	11th to 20th	Day	36% 11% 11% 25% 15% 3	4392
	21st to end	Day	27% 7% 11% 25% 24% 5%	4825
June	1st to 10th	Day	29% 10% 18% 21% 16% 6%	2660
	11th to 20th	Day	28% 7% 10% 19% 24% 12%	2660
	21st to end	Day	26% 8% 11% 21% 23% 12%	2660
July	1st to 10th	Day	26% 6% 11% 13% 22% 22%	4361
	11th to 20th	Day	28% 8% 10% 19% 19% 16%	4355
	21st to end	Day	29% 7% 10% 17% 19% 19%	4591
August	1st to 10th	Day	33% 11% 14% 18% 15% 8%	4078
	11th to 20th	Day	28% 8% 12% 16% 21% 15%	3856
	21st to end	Day	27% 6% 11% 17% 25% 14%	4179
September	1st to 10th	Day	25% 6% 9% 18% 27% 14%	2280
	11th to 20th	Day	26% 6% 9% 21% 26% 12%	2280
	21st to end	Day	24% 4 8% 21% 34% 9%	2066
October	1st to 10th	Day	27% 6% 8% 25% 25% 9%	1900
	11th to 20th	Day	20% 6% 10% 29% 28% 7%	1900
	21st to end	Day	23% 5% 11% 29% 26% 7%	1963
November	1st to 10th	Day	18% 4 14% 28% 30% 6%	1673
	11th to 20th	Day	18% 5% 14% 31% 25% 6%	1710
	21st to end	Day	23% 5% 13% 30% 21% 9%	1530
December	1st to 10th	Day	21% 7% 20% 29% 18% 5%	1520
	11th to 20th	Day	22% 8% 13% 32% 21% 3	1924
	21st to end	Day	27% 8% 10% 27% 20% 8%	2794
January	1st to 10th	Night	23% 6% 14% 32% 20% 5%	4417
	11th to 20th	Night	17% 4 21% 30% 20% 7%	4398
	21st to end	Night	22% 6% 16% 31% 20% 5%	4521
February	1st to 10th	Night	22% 6% 20% 28% 19% 5%	2470
	11th to 20th	Night	21% 5% 16% 32% 22% 4	2296
	21st to end	Night	24% 3 12% 28% 25% 8%	1884
March	1st to 10th	Night	24% 5% 9% 27% 26% 8%	3718
	11th to 20th	Night	28% 6% 13% 29% 21% 3	3490
	21st to end	Night	26% 7% 15% 35% 16% 2	3617
April	1st to 10th	Night	26% 6% 13% 28% 19% 7%	1900
	11th to 20th	Night	30% 5% 14% 29% 17% 4	1877
	21st to end	Night	32% 6% 10% 31% 19% 1	1900
May	1st to 10th	Night	32% 7% 9% 25% 21% 6%	2815
	11th to 20th	Night	29% 10% 13% 31% 15% 2	2518
	21st to end	Night	23% 6% 13% 27% 27% 4	2762
June	1st to 10th	Night	19% 9% 22% 28% 17% 6%	1520
	11th to 20th	Night	19% 7% 12% 24% 24% 14%	1520
	21st to end	Night	18% 7% 10% 25% 25% 15%	1520
July	1st to 10th	Night	20% 5% 10% 21% 24% 20%	2500
	11th to 20th	Night	19% 5% 13% 28% 22% 13%	2492
	21st to end	Night	21% 5% 12% 26% 19% 17%	2731
August	1st to 10th	Night	26% 7% 18% 23% 19% 7%	2838
	11th to 20th	Night	23% 7% 19% 20% 20% 11%	3049
	21st to end	Night	20% 5% 13% 23% 30% 8%	3487
September	1st to 10th	Night	22% 5% 10% 21% 27% 16%	1900
	11th to 20th	Night	20% 4 9% 27% 26% 14%	1900
	21st to end	Night	21% 4 8% 27% 31% 9%	2112
October	1st to 10th	Night	23% 5% 10% 27% 26% 10%	2280
	11th to 20th	Night	17% 5% 10% 32% 25% 11%	2280
	21st to end	Night	24% 4 12% 28% 25% 7%	2480
November	1st to 10th	Night	16% 5% 15% 28% 28% 8%	2405
	11th to 20th	Night	17% 4 16% 31% 25% 6%	2470
	21st to end	Night	22% 5% 12% 30% 25% 7%	2646
December	1st to 10th	Night	18% 6% 20% 29% 20% 6%	2660
	11th to 20th	Night	21% 8% 14% 30% 23% 4	3272
	21st to end	Night	23% 8% 13% 24% 22% 9%	4873

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	28% 32% 23% 10% 6% 2	270
	11th to 20th	Day	31% 38% 19% 11% 1	270
	21st to end	Day	26% 41% 24% 5% 3	297
February	1st to 10th	Day	38% 39% 17% 4 1 1	270
	11th to 20th	Day	37% 35% 23% 4 2	270
	21st to end	Day	34% 42% 20% 4	225
March	1st to 10th	Day	28% 35% 26% 9% 1	270
	11th to 20th	Day	22% 32% 31% 11% 3	460
	21st to end	Day	22% 38% 30% 8% 2	506
April	1st to 10th	Day	28% 35% 27% 9% 2	460
	11th to 20th	Day	31% 35% 27% 6% 1	452
	21st to end	Day	22% 33% 29% 11% 3 1	460
May	1st to 10th	Day	22% 32% 26% 13% 5% 1	583
	11th to 20th	Day	19% 17% 35% 17% 8% 2	675
	21st to end	Day	14% 21% 30% 25% 9% 1	734
June	1st to 10th	Day	8% 18% 32% 26% 13% 3	680
	11th to 20th	Day	11% 20% 40% 19% 7% 2	680
	21st to end	Day	7% 17% 37% 24% 13% 3	680
July	1st to 10th	Day	8% 7% 31% 34% 18% 3	671
	11th to 20th	Day	4 9% 36% 32% 15% 4	668
	21st to end	Day	6% 7% 33% 32% 18% 4	701
August	1st to 10th	Day	9% 11% 40% 31% 7% 2	487
	11th to 20th	Day	6% 11% 40% 29% 12% 2	477
	21st to end	Day	7% 14% 36% 33% 8% 2	539
September	1st to 10th	Day	8% 17% 37% 27% 10% 2	490
	11th to 20th	Day	10% 20% 39% 22% 8% 1	490
	21st to end	Day	14% 20% 32% 20% 10% 3	305
October	1st to 10th	Day	13% 22% 30% 23% 10% 3	300
	11th to 20th	Day	22% 31% 27% 13% 5% 2	300
	21st to end	Day	19% 40% 27% 11% 4	311
November	1st to 10th	Day	25% 33% 24% 10% 6% 1	270
	11th to 20th	Day	25% 40% 23% 9% 2	270
	21st to end	Day	21% 42% 26% 9% 1	270
December	1st to 10th	Day	32% 36% 25% 6% 2	270
	11th to 20th	Day	28% 45% 21% 5% 1	270
	21st to end	Day	35% 33% 20% 9% 1 1	297
January	1st to 10th	Night	24% 38% 19% 14% 3 1	950
	11th to 20th	Night	28% 42% 17% 9% 4 1	931
	21st to end	Night	20% 44% 22% 10% 3	836
February	1st to 10th	Night	26% 41% 21% 9% 3	760
	11th to 20th	Night	22% 37% 27% 13% 1	744
	21st to end	Night	26% 41% 23% 8% 1	628
March	1st to 10th	Night	17% 38% 29% 12% 4	760
	11th to 20th	Night	16% 32% 28% 20% 4 1	760
	21st to end	Night	14% 35% 31% 16% 3 1	715
April	1st to 10th	Night	15% 32% 35% 16% 2	570
	11th to 20th	Night	16% 31% 32% 14% 6%	563
	21st to end	Night	17% 26% 28% 23% 6% 1	570
May	1st to 10th	Night	15% 19% 36% 20% 8% 1	570
	11th to 20th	Night	17% 11% 29% 29% 13% 1	561
	21st to end	Night	12% 12% 31% 28% 17% 2	617
June	1st to 10th	Night	6% 9% 31% 36% 17% 2	570
	11th to 20th	Night	7% 14% 37% 31% 11%	570
	21st to end	Night	5% 7% 30% 36% 20% 1	570
July	1st to 10th	Night	6% 3 19% 43% 26% 3	555
	11th to 20th	Night	2 3 25% 42% 24% 3	552
	21st to end	Night	5% 3 16% 46% 27% 3	624
August	1st to 10th	Night	7% 4 19% 48% 21% 2	567
	11th to 20th	Night	4 5% 25% 42% 22% 3	564
	21st to end	Night	4 6% 21% 42% 23% 4	627
September	1st to 10th	Night	8% 6% 23% 40% 18% 4	570
	11th to 20th	Night	8% 9% 28% 37% 16% 2	570
	21st to end	Night	8% 16% 27% 33% 14% 2	597
October	1st to 10th	Night	11% 20% 31% 26% 10% 2	760
	11th to 20th	Night	17% 29% 26% 21% 7% 1	760
	21st to end	Night	16% 34% 32% 12% 5% 1	856
November	1st to 10th	Night	15% 36% 30% 14% 4 1	925
	11th to 20th	Night	25% 38% 25% 10% 2 1	950
	21st to end	Night	16% 40% 29% 11% 3	950
December	1st to 10th	Night	27% 39% 23% 9% 2	950
	11th to 20th	Night	21% 45% 20% 11% 3 1	950
	21st to end	Night	27% 39% 20% 9% 4	1045

Page generated at 2024-10-22 18:21:05. Version ac07

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