Coyote Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Coyote Lake clear sky chart from 2005-11-06 to 2024-04-10.

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	8% 5% 2 4 3 2 4 4 4 7% 58%	83371
	Night	10% 6% 2 4 4 2 4 4 5% 8% 51%	85503
Transparency	Day	28% 5% 9% 20% 23% 17%	83090
	Night	33% 6% 9% 18% 20% 14%	85305
Seeing	Day	8% 7% 21% 32% 23% 8%	14595
	Night	10% 4 12% 34% 32% 8%	24129

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	15% 12% 3 4 5% 2 3 3 5% 5% 43%	2671
	11th to 20th	Day	16% 8% 3 6% 6% 4 5% 5% 5% 6% 36%	2860
	21st to end	Day	21% 8% 3 5% 5% 3 4 4 5% 7% 33%	3146
February	1st to 10th	Day	18% 6% 3 4 4 2 3 2 5% 6% 47%	1710
	11th to 20th	Day	12% 7% 3 5% 5% 3 5% 4 4 7% 45%	1798
	21st to end	Day	15% 6% 3 5% 4 3 4 4 5% 5% 46%	1570
March	1st to 10th	Day	13% 12% 4 7% 7% 4 7% 7% 6% 6% 27%	3320
	11th to 20th	Day	10% 6% 2 3 3 2 3 4 4 8% 55%	3490
	21st to end	Day	12% 9% 4 7% 6% 3 6% 6% 5% 7% 35%	3934
April	1st to 10th	Day	12% 7% 3 4 4 4 4 3 4 7% 48%	2270
	11th to 20th	Day	9% 5% 2 4 3 2 3 4 4 7% 56%	2129
	21st to end	Day	7% 4 1 4 4 2 3 3 4 8% 60%	2160
May	1st to 10th	Day	4 5% 3 4 3 1 3 4 5% 8% 61%	2160
	11th to 20th	Day	4 3 2 3 3 2 3 4 4 7% 64%	2369
	21st to end	Day	4 4 2 5% 4 3 4 4 5% 7% 58%	2723
June	1st to 10th	Day	3 3 2 3 3 2 3 4 4 8% 64%	2520
	11th to 20th	Day	1 2 1 2 2 1 2 2 4 7% 76%	2520
	21st to end	Day	2 2 1 2 2 2 2 3 3 5% 77%	2520
July	1st to 10th	Day	1 1 1 2 2 2 3 2 4 6% 77%	2520
	11th to 20th	Day	1 1 1 2 2 1 3 3 3 6% 77%	2381
	21st to end	Day	1 1 1 2 1 3 3 4 6% 79%	2546
August	1st to 10th	Day	1 2 1 3 2 2 3 3 4 8% 72%	2328
	11th to 20th	Day	1 1 1 1 2 1 2 3 3 6% 80%	2137
	21st to end	Day	1 1 2 2 1 2 3 4 7% 77%	2376
September	1st to 10th	Day	2 2 1 1 1 1 1 1 2 5% 82%	2160
	11th to 20th	Day	2 1 1 2 2 2 3 4 4 8% 71%	2160
	21st to end	Day	3 2 1 2 1 1 2 2 3 5% 78%	1933
October	1st to 10th	Day	3 3 1 3 2 1 3 4 4 6% 70%	1800
	11th to 20th	Day	4 2 1 3 2 2 3 3 5% 6% 69%	1800
	21st to end	Day	6% 4 2 3 3 2 3 3 4 6% 64%	1980
November	1st to 10th	Day	8% 4 1 3 3 3 5% 4 5% 8% 56%	1798
	11th to 20th	Day	9% 4 1 4 4 2 5% 5% 5% 7% 55%	1710
	21st to end	Day	11% 4 2 3 2 2 3 3 5% 7% 57%	1630
December	1st to 10th	Day	13% 6% 2 4 4 3 4 5% 5% 7% 48%	1520
	11th to 20th	Day	28% 8% 3 5% 4 2 3 4 4 5% 33%	1928
	21st to end	Day	14% 10% 3 6% 6% 3 4 5% 5% 7% 37%	2794
January	1st to 10th	Night	12% 7% 3 4 4 2 4 4 5% 6% 48%	4273
	11th to 20th	Night	19% 8% 3 5% 5% 3 5% 5% 5% 7% 36%	4110
	21st to end	Night	21% 11% 3 5% 5% 3 4 4 4 6% 34%	4521
February	1st to 10th	Night	17% 6% 2 4 3 2 3 3 4 6% 50%	2470
	11th to 20th	Night	12% 7% 2 4 4 2 4 5% 6% 8% 47%	2268
	21st to end	Night	13% 7% 2 5% 3 2 2 3 4 7% 52%	1884
March	1st to 10th	Night	18% 12% 4 7% 5% 2 4 4 4 7% 32%	3550
	11th to 20th	Night	11% 6% 2 3 4 2 3 3 4 8% 54%	3490
	21st to end	Night	14% 14% 4 6% 5% 3 3 4 4 7% 35%	3719
April	1st to 10th	Night	11% 6% 3 3 4 2 5% 5% 5% 6% 49%	1900
	11th to 20th	Night	8% 7% 2 4 4 2 4 3 4 8% 55%	1779
	21st to end	Night	4 5% 3 3 3 2 4 4 5% 10% 57%	1800
May	1st to 10th	Night	3 6% 3 5% 4 2 4 5% 5% 8% 55%	1800
	11th to 20th	Night	3 4 2 4 4 2 6% 5% 5% 11% 53%	1515
	21st to end	Night	3 7% 4 6% 4 2 4 4 5% 8% 52%	1552
June	1st to 10th	Night	3 4 3 4 5% 2 5% 4 5% 8% 58%	1440
	11th to 20th	Night	1 3 2 5% 4 2 4 4 3 7% 64%	1440
	21st to end	Night	1 3 3 5% 4 2 4 3 4 7% 65%	1440
July	1st to 10th	Night	1 1 1 4 6% 4 6% 4 5% 11% 59%	1440
	11th to 20th	Night	1 1 2 3 3 3 5% 4 5% 12% 61%	1574
	21st to end	Night	1 1 2 5% 6% 3 6% 6% 6% 12% 53%	1773
August	1st to 10th	Night	1 4 3 6% 5% 3 6% 5% 6% 12% 49%	1611
	11th to 20th	Night	2 2 4 4 2 5% 4 6% 10% 62%	1763
	21st to end	Night	1 1 1 4 5% 3 4 3 5% 10% 63%	1980
September	1st to 10th	Night	1 2 1 3 3 2 3 3 4 8% 71%	1800
	11th to 20th	Night	3 3 2 4 4 2 3 3 4 8% 64%	1800
	21st to end	Night	2 3 1 3 2 1 2 2 3 7% 72%	2020
October	1st to 10th	Night	4 4 2 2 3 1 2 2 4 8% 68%	2160
	11th to 20th	Night	4 5% 1 3 3 2 3 3 4 8% 63%	2160
	21st to end	Night	5% 3 1 4 4 2 4 3 3 6% 66%	2376
November	1st to 10th	Night	7% 5% 2 3 3 2 3 3 4 8% 60%	2281
	11th to 20th	Night	8% 5% 2 4 2 2 3 4 6% 10% 55%	2470
	21st to end	Night	8% 5% 2 3 4 2 3 4 4 7% 58%	2546
December	1st to 10th	Night	15% 6% 1 4 4 2 3 4 4 7% 50%	2660
	11th to 20th	Night	27% 7% 3 5% 4 2 4 3 4 6% 34%	3276
	21st to end	Night	18% 7% 3 6% 6% 3 5% 4 5% 7% 36%	4862

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	42% 5% 12% 30% 8% 3	2671
	11th to 20th	Day	49% 3 14% 15% 11% 8%	2860
	21st to end	Day	50% 5% 10% 18% 13% 5%	3146
February	1st to 10th	Day	39% 2 7% 22% 18% 11%	1710
	11th to 20th	Day	39% 4 8% 19% 22% 8%	1808
	21st to end	Day	40% 4 8% 23% 20% 5%	1570
March	1st to 10th	Day	54% 5% 12% 13% 14% 3	3320
	11th to 20th	Day	29% 4 12% 31% 13% 11%	3490
	21st to end	Day	44% 8% 16% 20% 10% 3	3934
April	1st to 10th	Day	37% 4 12% 22% 20% 5%	2270
	11th to 20th	Day	30% 5% 13% 24% 21% 7%	2132
	21st to end	Day	25% 5% 11% 29% 24% 6%	2160
May	1st to 10th	Day	23% 4 11% 25% 30% 7%	2160
	11th to 20th	Day	21% 4 7% 32% 27% 9%	2372
	21st to end	Day	26% 7% 11% 28% 23% 5%	2724
June	1st to 10th	Day	21% 5% 11% 26% 27% 10%	2520
	11th to 20th	Day	13% 4 8% 21% 35% 18%	2520
	21st to end	Day	14% 4 4 13% 33% 33%	2520
July	1st to 10th	Day	12% 5% 3 9% 24% 47%	2451
	11th to 20th	Day	13% 5% 5% 10% 23% 44%	2309
	21st to end	Day	9% 4 3 9% 32% 42%	2405
August	1st to 10th	Day	17% 5% 3 10% 30% 36%	2312
	11th to 20th	Day	11% 5% 2 11% 32% 39%	2137
	21st to end	Day	12% 6% 2 10% 32% 38%	2376
September	1st to 10th	Day	10% 2 2 8% 30% 47%	2160
	11th to 20th	Day	15% 6% 4 22% 35% 19%	2160
	21st to end	Day	11% 3 2 23% 37% 24%	1933
October	1st to 10th	Day	16% 4 8% 18% 28% 27%	1800
	11th to 20th	Day	18% 4 7% 21% 24% 26%	1800
	21st to end	Day	23% 3 7% 20% 24% 23%	1980
November	1st to 10th	Day	26% 4 8% 23% 25% 14%	1798
	11th to 20th	Day	29% 4 9% 23% 26% 9%	1710
	21st to end	Day	28% 3 10% 18% 30% 11%	1630
December	1st to 10th	Day	35% 4 12% 19% 18% 12%	1520
	11th to 20th	Day	53% 3 9% 16% 13% 6%	1928
	21st to end	Day	46% 3 14% 21% 12% 4	2794
January	1st to 10th	Night	37% 4 18% 25% 12% 3	4273
	11th to 20th	Night	47% 3 17% 16% 10% 8%	4110
	21st to end	Night	50% 5% 11% 16% 11% 6%	4521
February	1st to 10th	Night	37% 2 7% 21% 21% 12%	2470
	11th to 20th	Night	35% 5% 9% 21% 22% 8%	2269
	21st to end	Night	33% 3 11% 29% 18% 7%	1884
March	1st to 10th	Night	51% 5% 13% 13% 13% 3	3550
	11th to 20th	Night	32% 7% 7% 25% 19% 11%	3490
	21st to end	Night	45% 8% 13% 20% 10% 4	3719
April	1st to 10th	Night	34% 5% 13% 22% 20% 6%	1900
	11th to 20th	Night	29% 6% 11% 27% 19% 7%	1779
	21st to end	Night	23% 7% 10% 30% 23% 6%	1800
May	1st to 10th	Night	29% 6% 8% 22% 24% 11%	1800
	11th to 20th	Night	27% 10% 8% 21% 26% 7%	1515
	21st to end	Night	30% 10% 10% 21% 25% 4	1552
June	1st to 10th	Night	24% 8% 10% 23% 24% 11%	1440
	11th to 20th	Night	22% 5% 6% 14% 30% 22%	1440
	21st to end	Night	20% 10% 2 11% 25% 32%	1440
July	1st to 10th	Night	21% 11% 3 5% 20% 41%	1400
	11th to 20th	Night	20% 8% 6% 8% 20% 38%	1523
	21st to end	Night	26% 10% 6% 7% 20% 31%	1674
August	1st to 10th	Night	31% 9% 3 8% 19% 29%	1602
	11th to 20th	Night	22% 7% 3 9% 25% 35%	1763
	21st to end	Night	20% 10% 3 7% 28% 32%	1980
September	1st to 10th	Night	16% 3 5% 6% 25% 46%	1800
	11th to 20th	Night	21% 9% 3 16% 30% 21%	1800
	21st to end	Night	16% 5% 3 15% 38% 23%	2020
October	1st to 10th	Night	19% 5% 7% 18% 24% 28%	2160
	11th to 20th	Night	23% 5% 6% 18% 23% 25%	2160
	21st to end	Night	22% 4 5% 20% 24% 24%	2376
November	1st to 10th	Night	25% 4 8% 23% 23% 17%	2281
	11th to 20th	Night	26% 3 11% 22% 28% 10%	2470
	21st to end	Night	27% 4 8% 21% 25% 15%	2546
December	1st to 10th	Night	35% 4 9% 20% 19% 13%	2660
	11th to 20th	Night	51% 4 10% 16% 16% 4	3276
	21st to end	Night	48% 5% 15% 17% 12% 5%	4862

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% 7% 23% 23% 17% 3	260
	11th to 20th	Day	18% 6% 19% 29% 22% 5%	370
	21st to end	Day	16% 8% 17% 29% 24% 5%	407
February	1st to 10th	Day	21% 9% 20% 25% 18% 7%	370
	11th to 20th	Day	14% 15% 23% 29% 15% 3	430
	21st to end	Day	14% 13% 24% 32% 15% 3	382
March	1st to 10th	Day	20% 14% 23% 30% 11% 2	460
	11th to 20th	Day	19% 11% 23% 26% 15% 5%	460
	21st to end	Day	16% 14% 30% 25% 13% 2	506
April	1st to 10th	Day	16% 10% 29% 27% 13% 4	457
	11th to 20th	Day	12% 14% 30% 25% 15% 4	412
	21st to end	Day	6% 13% 29% 27% 16% 7%	420
May	1st to 10th	Day	7% 12% 31% 30% 15% 5%	423
	11th to 20th	Day	7% 10% 30% 33% 14% 6%	448
	21st to end	Day	6% 12% 26% 31% 18% 6%	485
June	1st to 10th	Day	5% 8% 27% 31% 19% 10%	450
	11th to 20th	Day	1 7% 27% 37% 22% 6%	450
	21st to end	Day	2 4 21% 38% 27% 9%	450
July	1st to 10th	Day	1 1 17% 39% 32% 9%	446
	11th to 20th	Day	1 10% 40% 34% 15%	444
	21st to end	Day	1 10% 40% 32% 15%	487
August	1st to 10th	Day	3 2 17% 38% 31% 9%	447
	11th to 20th	Day	1 1 16% 36% 30% 16%	437
	21st to end	Day	1 11% 40% 33% 14%	495
September	1st to 10th	Day	3 3 11% 36% 32% 16%	450
	11th to 20th	Day	2 4 22% 36% 26% 11%	450
	21st to end	Day	4 6% 12% 34% 33% 11%	450
October	1st to 10th	Day	4 7% 22% 28% 28% 11%	450
	11th to 20th	Day	5% 6% 19% 28% 30% 12%	450
	21st to end	Day	8% 5% 18% 28% 29% 10%	495
November	1st to 10th	Day	7% 8% 14% 28% 31% 11%	394
	11th to 20th	Day	7% 6% 11% 32% 32% 12%	270
	21st to end	Day	9% 4 17% 31% 31% 7%	232
December	1st to 10th	Day	13% 9% 17% 27% 24% 10%	180
	11th to 20th	Day	16% 10% 16% 27% 24% 8%	180
	21st to end	Day	17% 10% 17% 30% 22% 4	198
January	1st to 10th	Night	16% 5% 13% 36% 23% 7%	760
	11th to 20th	Night	14% 3 12% 38% 25% 9%	760
	21st to end	Night	19% 4 11% 36% 25% 6%	836
February	1st to 10th	Night	19% 4 13% 34% 24% 6%	760
	11th to 20th	Night	15% 5% 17% 33% 23% 7%	744
	21st to end	Night	17% 5% 16% 39% 20% 3	628
March	1st to 10th	Night	19% 7% 13% 34% 23% 4	760
	11th to 20th	Night	16% 5% 15% 34% 25% 6%	760
	21st to end	Night	14% 8% 18% 38% 19% 3	836
April	1st to 10th	Night	13% 7% 16% 37% 23% 4	760
	11th to 20th	Night	10% 8% 19% 36% 21% 5%	711
	21st to end	Night	7% 5% 22% 33% 25% 8%	720
May	1st to 10th	Night	7% 3 19% 38% 26% 6%	720
	11th to 20th	Night	7% 1 13% 37% 34% 7%	453
	21st to end	Night	8% 7% 13% 34% 32% 6%	389
June	1st to 10th	Night	5% 4 13% 37% 36% 5%	360
	11th to 20th	Night	2 4 13% 42% 37% 3	360
	21st to end	Night	2 3 6% 39% 46% 5%	360
July	1st to 10th	Night	2 1 5% 33% 53% 6%	350
	11th to 20th	Night	1 3 23% 57% 15%	479
	21st to end	Night	1 2 6% 25% 51% 16%	591
August	1st to 10th	Night	3 3 8% 29% 47% 10%	537
	11th to 20th	Night	2 2 6% 37% 43% 10%	695
	21st to end	Night	1 1 7% 29% 51% 12%	792
September	1st to 10th	Night	2 1 6% 30% 49% 13%	720
	11th to 20th	Night	4 2 9% 34% 42% 10%	720
	21st to end	Night	4 2 10% 29% 42% 12%	720
October	1st to 10th	Night	5% 3 9% 35% 34% 13%	720
	11th to 20th	Night	7% 4 10% 30% 38% 12%	720
	21st to end	Night	6% 2 11% 34% 29% 18%	792
November	1st to 10th	Night	9% 3 13% 32% 32% 11%	740
	11th to 20th	Night	11% 2 10% 36% 33% 8%	760
	21st to end	Night	9% 3 12% 40% 28% 8%	760
December	1st to 10th	Night	17% 4 12% 36% 24% 7%	760
	11th to 20th	Night	22% 5% 12% 34% 23% 4	760
	21st to end	Night	19% 6% 17% 34% 20% 4	836

Page generated at 2024-04-07 06:28:11. Version ac07

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