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 2024-02-25.

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	4 5% 3 5% 5% 3 5% 5% 6% 8% 50%	78478
	Night	3 4 2 4 4 2 4 4 5% 8% 59%	80872
Transparency	Day	29% 7% 13% 24% 20% 7%	78184
	Night	22% 6% 14% 28% 22% 7%	80689
Seeing	Day	17% 25% 30% 18% 8% 2	14616
	Night	16% 27% 25% 21% 9% 1	24831

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 6% 6% 3 4 4 5% 9% 59%	2538
	11th to 20th	Day	3 2 7% 5% 3 5% 6% 7% 12% 51%	2586
	21st to end	Day	5% 3 6% 4 3 4 4 5% 8% 59%	3146
February	1st to 10th	Day	5% 3 6% 5% 2 4 5% 7% 8% 53%	1710
	11th to 20th	Day	4 2 5% 5% 3 5% 5% 6% 11% 55%	1771
	21st to end	Day	6% 4 5% 4 3 4 4 6% 9% 55%	1520
March	1st to 10th	Day	1 6% 3 6% 5% 2 5% 5% 6% 9% 51%	1800
	11th to 20th	Day	2 8% 4 5% 5% 3 5% 4 6% 8% 50%	1980
	21st to end	Day	3 8% 3 7% 4 3 6% 7% 7% 10% 43%	2291
April	1st to 10th	Day	4 6% 3 6% 5% 2 5% 5% 6% 9% 49%	2160
	11th to 20th	Day	7% 10% 3 7% 5% 3 5% 4 7% 8% 40%	2131
	21st to end	Day	6% 10% 3 7% 7% 4 5% 6% 7% 8% 38%	2160
May	1st to 10th	Day	10% 10% 3 5% 5% 4 5% 6% 5% 8% 38%	2345
	11th to 20th	Day	11% 11% 3 6% 5% 4 6% 5% 6% 8% 36%	2478
	21st to end	Day	8% 6% 3 6% 6% 4 6% 7% 8% 9% 37%	2724
June	1st to 10th	Day	5% 4 3 4 5% 4 6% 8% 8% 10% 45%	2520
	11th to 20th	Day	6% 4 2 5% 4 3 5% 6% 5% 9% 52%	2520
	21st to end	Day	2 4 2 4 6% 4 6% 6% 7% 9% 51%	2520
July	1st to 10th	Day	6% 4 2 5% 5% 4 7% 7% 8% 8% 44%	2520
	11th to 20th	Day	3 3 2 5% 5% 4 6% 6% 8% 9% 48%	2520
	21st to end	Day	7% 5% 3 6% 6% 4 6% 7% 8% 9% 40%	2706
August	1st to 10th	Day	6% 5% 2 5% 6% 4 7% 8% 7% 9% 40%	2328
	11th to 20th	Day	5% 5% 2 6% 6% 3 6% 5% 6% 8% 49%	2179
	21st to end	Day	4 5% 2 5% 6% 4 6% 6% 7% 9% 46%	2376
September	1st to 10th	Day	5% 5% 2 4 4 3 3 4 5% 6% 58%	2160
	11th to 20th	Day	6% 3 1 4 4 3 5% 5% 6% 7% 55%	2160
	21st to end	Day	6% 6% 3 4 3 2 2 3 4 5% 62%	1958
October	1st to 10th	Day	5% 6% 2 4 4 3 5% 5% 5% 7% 55%	1800
	11th to 20th	Day	2 4 2 4 4 2 3 4 5% 7% 63%	1800
	21st to end	Day	4 6% 2 4 3 2 4 4 6% 6% 60%	1918
November	1st to 10th	Day	2 3 2 3 4 1 3 4 5% 7% 66%	1673
	11th to 20th	Day	1 4 3 3 2 2 3 4 5% 9% 64%	1710
	21st to end	Day	4 2 5% 5% 4 5% 3 5% 8% 59%	1530
December	1st to 10th	Day	4 2 4 4 2 3 4 5% 10% 60%	1520
	11th to 20th	Day	2 5% 3 4 4 2 3 4 8% 11% 55%	1926
	21st to end	Day	1 5% 4 8% 6% 2 4 4 4 7% 55%	2794
January	1st to 10th	Night	3 2 6% 5% 3 4 5% 6% 8% 57%	4417
	11th to 20th	Night	2 2 3 4 3 4 5% 6% 8% 64%	4398
	21st to end	Night	1 5% 3 5% 4 2 3 4 4 8% 61%	4521
February	1st to 10th	Night	4 2 5% 4 3 5% 4 6% 8% 60%	2470
	11th to 20th	Night	4 2 4 4 2 4 4 5% 8% 61%	2295
	21st to end	Night	1 6% 3 5% 4 3 3 4 4 8% 60%	1830
March	1st to 10th	Night	1 4 2 5% 4 2 4 5% 6% 9% 58%	2157
	11th to 20th	Night	2 6% 3 5% 3 2 3 4 6% 7% 60%	1980
	21st to end	Night	3 6% 3 5% 3 2 4 5% 5% 9% 55%	2064
April	1st to 10th	Night	2 6% 2 4 5% 3 4 4 6% 8% 56%	1800
	11th to 20th	Night	6% 7% 3 6% 4 2 3 4 5% 8% 52%	1777
	21st to end	Night	9% 9% 2 4 4 2 3 4 6% 8% 49%	1800
May	1st to 10th	Night	8% 8% 2 5% 5% 4 4 5% 4 8% 46%	1608
	11th to 20th	Night	11% 10% 2 4 3 3 4 4 4 7% 47%	1417
	21st to end	Night	5% 5% 2 4 4 4 4 5% 7% 9% 51%	1552
June	1st to 10th	Night	4 3 1 3 3 2 4 5% 7% 9% 59%	1440
	11th to 20th	Night	5% 3 1 3 3 2 5% 5% 5% 8% 61%	1440
	21st to end	Night	4 3 2 2 3 2 3 4 7% 8% 62%	1440
July	1st to 10th	Night	5% 3 2 4 4 3 5% 4 6% 10% 55%	1440
	11th to 20th	Night	2 3 1 3 3 2 4 5% 6% 10% 61%	1440
	21st to end	Night	3 4 2 4 4 3 5% 6% 8% 8% 53%	1608
August	1st to 10th	Night	4 3 2 5% 5% 3 4 5% 7% 9% 53%	1611
	11th to 20th	Night	3 4 2 3 4 2 4 4 6% 9% 60%	1722
	21st to end	Night	3 3 2 3 4 3 5% 5% 7% 8% 58%	1980
September	1st to 10th	Night	5% 4 2 3 4 2 3 4 4 7% 61%	1800
	11th to 20th	Night	6% 3 1 3 3 2 3 3 5% 7% 64%	1800
	21st to end	Night	5% 3 1 3 3 2 3 3 4 7% 65%	2000
October	1st to 10th	Night	4 6% 3 4 3 2 3 3 5% 7% 60%	2160
	11th to 20th	Night	3 4 1 2 3 2 2 3 4 7% 69%	2160
	21st to end	Night	3 7% 3 5% 3 3 3 3 4 8% 59%	2420
November	1st to 10th	Night	2 3 1 2 3 1 4 4 5% 7% 69%	2405
	11th to 20th	Night	1 4 2 3 3 2 3 4 5% 8% 67%	2470
	21st to end	Night	1 4 2 5% 4 2 4 4 5% 7% 61%	2646
December	1st to 10th	Night	1 3 2 4 2 2 4 3 5% 8% 65%	2660
	11th to 20th	Night	1 5% 2 4 3 2 3 5% 6% 9% 59%	3271
	21st to end	Night	1 5% 3 5% 4 2 4 4 6% 8% 58%	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	26% 6% 14% 27% 22% 6%	1520
March	1st to 10th	Day	29% 5% 15% 29% 20% 2	1800
	11th to 20th	Day	31% 5% 15% 27% 18% 4	1980
	21st to end	Day	33% 6% 15% 28% 14% 3	2291
April	1st to 10th	Day	30% 7% 15% 25% 16% 8%	2160
	11th to 20th	Day	39% 5% 14% 22% 16% 4	2134
	21st to end	Day	41% 7% 9% 27% 14% 1	2160
May	1st to 10th	Day	43% 8% 12% 21% 14% 2	2345
	11th to 20th	Day	45% 7% 12% 24% 10% 1	2482
	21st to end	Day	38% 10% 13% 21% 14% 3	2724
June	1st to 10th	Day	30% 10% 18% 21% 15% 6%	2520
	11th to 20th	Day	29% 7% 10% 19% 23% 13%	2520
	21st to end	Day	26% 8% 11% 21% 23% 11%	2520
July	1st to 10th	Day	32% 9% 12% 16% 21% 9%	2451
	11th to 20th	Day	28% 9% 10% 21% 19% 13%	2445
	21st to end	Day	37% 9% 13% 20% 15% 7%	2556
August	1st to 10th	Day	37% 11% 13% 17% 15% 7%	2313
	11th to 20th	Day	32% 8% 10% 17% 22% 11%	2179
	21st to end	Day	32% 8% 11% 16% 25% 9%	2376
September	1st to 10th	Day	26% 6% 9% 18% 27% 15%	2160
	11th to 20th	Day	26% 7% 10% 22% 24% 12%	2160
	21st to end	Day	25% 4 8% 21% 34% 8%	1958
October	1st to 10th	Day	29% 6% 8% 26% 23% 8%	1800
	11th to 20th	Day	19% 5% 10% 29% 29% 8%	1800
	21st to end	Day	23% 5% 11% 29% 25% 7%	1918
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% 23% 8%	1830
March	1st to 10th	Night	22% 5% 14% 32% 24% 3	2157
	11th to 20th	Night	23% 4 13% 30% 24% 6%	1980
	21st to end	Night	26% 7% 16% 32% 17% 3	2064
April	1st to 10th	Night	26% 6% 14% 28% 18% 8%	1800
	11th to 20th	Night	30% 5% 15% 29% 17% 4	1777
	21st to end	Night	32% 7% 10% 31% 19% 1	1800
May	1st to 10th	Night	36% 8% 13% 27% 15% 2	1608
	11th to 20th	Night	36% 7% 15% 29% 13%	1418
	21st to end	Night	28% 7% 16% 26% 19% 3	1552
June	1st to 10th	Night	19% 9% 22% 28% 16% 7%	1440
	11th to 20th	Night	20% 7% 12% 23% 23% 15%	1440
	21st to end	Night	17% 7% 9% 26% 25% 15%	1440
July	1st to 10th	Night	25% 7% 13% 25% 21% 9%	1400
	11th to 20th	Night	18% 5% 14% 27% 21% 14%	1392
	21st to end	Night	24% 8% 16% 28% 16% 7%	1519
August	1st to 10th	Night	24% 9% 18% 26% 16% 7%	1602
	11th to 20th	Night	20% 6% 13% 24% 26% 11%	1722
	21st to end	Night	22% 6% 11% 24% 28% 9%	1980
September	1st to 10th	Night	22% 5% 10% 20% 26% 17%	1800
	11th to 20th	Night	21% 4 9% 27% 25% 14%	1800
	21st to end	Night	21% 4 8% 28% 30% 9%	2000
October	1st to 10th	Night	24% 5% 10% 27% 25% 8%	2160
	11th to 20th	Night	16% 5% 10% 32% 25% 12%	2160
	21st to end	Night	25% 5% 12% 27% 25% 7%	2420
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	31% 42% 22% 4	210
March	1st to 10th	Day	28% 35% 28% 8% 1	240
	11th to 20th	Day	24% 33% 30% 10% 3	420
	21st to end	Day	22% 37% 29% 9% 2	462
April	1st to 10th	Day	28% 35% 27% 8% 1	420
	11th to 20th	Day	33% 33% 27% 6% 1	412
	21st to end	Day	22% 34% 28% 11% 4 1	420
May	1st to 10th	Day	20% 32% 27% 14% 6% 1	536
	11th to 20th	Day	20% 18% 34% 17% 9% 2	625
	21st to end	Day	14% 19% 30% 26% 9% 2	679
June	1st to 10th	Day	8% 17% 31% 26% 14% 3	630
	11th to 20th	Day	10% 21% 39% 20% 8% 3	630
	21st to end	Day	6% 17% 37% 24% 13% 3	630
July	1st to 10th	Day	7% 6% 30% 35% 19% 3	621
	11th to 20th	Day	4 8% 36% 31% 16% 5%	618
	21st to end	Day	6% 7% 33% 31% 19% 4	648
August	1st to 10th	Day	9% 11% 40% 31% 7% 2	447
	11th to 20th	Day	6% 10% 39% 30% 12% 2	437
	21st to end	Day	7% 14% 35% 34% 8% 2	495
September	1st to 10th	Day	8% 18% 37% 27% 9% 2	450
	11th to 20th	Day	9% 20% 39% 22% 9% 2	450
	21st to end	Day	15% 19% 32% 21% 10% 3	275
October	1st to 10th	Day	13% 23% 29% 21% 10% 3	270
	11th to 20th	Day	24% 32% 25% 12% 5% 2	270
	21st to end	Day	19% 39% 28% 10% 4	297
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	24% 42% 24% 9% 1	610
March	1st to 10th	Night	17% 38% 29% 12% 4	720
	11th to 20th	Night	16% 32% 27% 20% 4 1	720
	21st to end	Night	14% 35% 30% 16% 4 1	678
April	1st to 10th	Night	15% 32% 35% 16% 2	540
	11th to 20th	Night	16% 32% 31% 14% 7%	533
	21st to end	Night	17% 25% 28% 23% 6% 1	540
May	1st to 10th	Night	14% 19% 35% 21% 9% 1	540
	11th to 20th	Night	18% 10% 28% 28% 14% 1	531
	21st to end	Night	11% 11% 30% 28% 18% 2	584
June	1st to 10th	Night	5% 8% 31% 36% 18% 2	540
	11th to 20th	Night	7% 14% 36% 32% 11%	540
	21st to end	Night	5% 6% 28% 37% 21% 1	540
July	1st to 10th	Night	6% 2 18% 42% 28% 3	525
	11th to 20th	Night	2 3 25% 41% 25% 4	522
	21st to end	Night	5% 2 15% 46% 28% 3	591
August	1st to 10th	Night	6% 4 19% 48% 22% 2	537
	11th to 20th	Night	4 4 24% 43% 23% 3	534
	21st to end	Night	4 5% 20% 42% 24% 4	594
September	1st to 10th	Night	8% 7% 24% 39% 19% 4	540
	11th to 20th	Night	9% 9% 26% 37% 16% 3	540
	21st to end	Night	8% 16% 27% 33% 14% 2	565
October	1st to 10th	Night	12% 20% 30% 25% 11% 2	720
	11th to 20th	Night	18% 31% 25% 20% 7% 1	720
	21st to end	Night	15% 35% 32% 12% 5% 1	836
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 2024-02-22 04:05:41. Version ac07

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