Cuivre River State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Cuivre River State Park clear sky chart from 2005-11-06 to 2024-01-14.

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	13% 7% 3 5% 5% 3 4 4 5% 7% 43%	74740
	Night	13% 8% 3 5% 5% 3 4 4 5% 7% 44%	75033
Transparency	Day	41% 3 11% 26% 16% 2	74450
	Night	41% 3 10% 25% 17% 3	74844
Seeing	Day	15% 7% 24% 28% 20% 7%	14494
	Night	16% 7% 27% 33% 15% 1	24448

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	11% 12% 5% 8% 6% 3 4 5% 4 7% 36%	1517
	11th to 20th	Day	16% 12% 5% 9% 5% 3 4 3 4 6% 33%	1594
	21st to end	Day	13% 11% 5% 7% 6% 3 4 4 5% 6% 36%	1782
February	1st to 10th	Day	17% 9% 6% 8% 4 3 4 4 4 6% 34%	1620
	11th to 20th	Day	15% 9% 4 6% 5% 4 5% 5% 5% 7% 37%	1693
	21st to end	Day	17% 12% 3 6% 5% 3 3 3 4 5% 39%	1480
March	1st to 10th	Day	15% 10% 3 6% 5% 4 4 3 3 6% 41%	1854
	11th to 20th	Day	18% 11% 3 6% 5% 3 4 4 5% 5% 35%	1980
	21st to end	Day	22% 9% 4 6% 7% 4 5% 4 5% 5% 29%	2271
April	1st to 10th	Day	13% 7% 2 6% 5% 3 5% 4 5% 7% 43%	2160
	11th to 20th	Day	18% 9% 2 6% 5% 2 4 4 4 5% 41%	2134
	21st to end	Day	19% 7% 3 6% 6% 2 3 5% 6% 7% 37%	2160
May	1st to 10th	Day	16% 6% 3 5% 6% 3 5% 4 6% 8% 37%	2215
	11th to 20th	Day	16% 6% 3 5% 6% 3 4 5% 6% 7% 39%	2479
	21st to end	Day	12% 6% 3 5% 6% 3 5% 5% 6% 8% 40%	2725
June	1st to 10th	Day	7% 4 2 4 4 3 5% 6% 7% 9% 48%	2520
	11th to 20th	Day	8% 4 2 4 4 3 5% 5% 7% 8% 49%	2520
	21st to end	Day	6% 3 2 4 5% 4 6% 6% 7% 9% 47%	2520
July	1st to 10th	Day	9% 4 1 4 5% 3 5% 5% 7% 11% 45%	2520
	11th to 20th	Day	6% 3 2 5% 5% 3 5% 5% 6% 10% 51%	2520
	21st to end	Day	8% 4 2 5% 5% 3 5% 5% 6% 10% 47%	2590
August	1st to 10th	Day	8% 4 2 5% 5% 4 6% 6% 8% 9% 42%	2328
	11th to 20th	Day	9% 5% 2 6% 6% 4 5% 5% 6% 9% 43%	2155
	21st to end	Day	8% 4 2 4 5% 2 4 5% 6% 9% 51%	2376
September	1st to 10th	Day	13% 5% 2 4 4 2 3 3 4 7% 51%	2160
	11th to 20th	Day	10% 4 2 4 5% 2 4 4 6% 8% 52%	2159
	21st to end	Day	7% 4 2 4 5% 3 4 4 5% 8% 54%	1936
October	1st to 10th	Day	11% 4 2 5% 4 2 3 3 5% 7% 54%	1800
	11th to 20th	Day	16% 7% 2 4 4 2 2 3 4 5% 51%	1800
	21st to end	Day	18% 9% 2 5% 4 2 3 4 3 4 47%	1980
November	1st to 10th	Day	11% 5% 2 4 3 2 3 3 5% 7% 55%	1674
	11th to 20th	Day	15% 6% 3 5% 5% 3 3 4 4 7% 46%	1710
	21st to end	Day	16% 9% 4 6% 5% 2 4 3 4 7% 41%	1587
December	1st to 10th	Day	12% 11% 4 7% 5% 3 3 4 4 6% 42%	1520
	11th to 20th	Day	14% 8% 4 6% 5% 3 5% 4 6% 6% 40%	1918
	21st to end	Day	19% 13% 5% 9% 7% 4 4 5% 4 5% 25%	2783
January	1st to 10th	Night	13% 9% 5% 7% 5% 3 4 5% 5% 5% 39%	2648
	11th to 20th	Night	16% 9% 5% 8% 5% 3 3 4 4 5% 38%	2434
	21st to end	Night	13% 11% 5% 7% 5% 3 5% 4 5% 7% 36%	2574
February	1st to 10th	Night	16% 11% 6% 8% 6% 3 5% 4 4 5% 34%	2340
	11th to 20th	Night	16% 7% 4 6% 5% 4 4 4 5% 6% 40%	2151
	21st to end	Night	17% 9% 4 6% 5% 2 3 4 4 5% 41%	1776
March	1st to 10th	Night	16% 10% 3 6% 4 2 4 3 4 5% 43%	2120
	11th to 20th	Night	19% 7% 3 6% 5% 3 5% 3 5% 7% 36%	1980
	21st to end	Night	21% 11% 4 6% 5% 2 4 5% 5% 7% 29%	2084
April	1st to 10th	Night	12% 6% 3 6% 5% 3 4 4 4 7% 46%	1800
	11th to 20th	Night	14% 7% 2 5% 5% 2 5% 4 5% 7% 44%	1775
	21st to end	Night	18% 8% 3 5% 4 3 3 4 4 7% 41%	1800
May	1st to 10th	Night	16% 5% 2 4 6% 3 4 4 6% 9% 42%	1742
	11th to 20th	Night	15% 8% 2 5% 5% 4 3 4 4 6% 44%	1416
	21st to end	Night	11% 5% 2 5% 5% 4 5% 6% 6% 8% 44%	1551
June	1st to 10th	Night	7% 4 1 4 4 3 4 4 5% 10% 53%	1440
	11th to 20th	Night	6% 4 2 4 4 3 5% 4 6% 8% 53%	1440
	21st to end	Night	5% 3 2 4 4 3 5% 5% 7% 10% 53%	1440
July	1st to 10th	Night	9% 3 2 5% 4 2 4 5% 6% 10% 51%	1440
	11th to 20th	Night	6% 3 2 3 4 3 4 4 6% 9% 56%	1440
	21st to end	Night	7% 4 2 5% 4 3 5% 4 6% 11% 51%	1724
August	1st to 10th	Night	7% 4 1 4 3 3 6% 6% 6% 8% 53%	1611
	11th to 20th	Night	7% 4 3 5% 5% 2 4 5% 4 8% 53%	1746
	21st to end	Night	6% 2 2 4 5% 3 4 5% 5% 8% 57%	1980
September	1st to 10th	Night	13% 4 2 3 4 2 4 4 4 7% 54%	1800
	11th to 20th	Night	8% 4 1 5% 4 3 4 4 5% 7% 54%	1800
	21st to end	Night	7% 4 2 4 4 3 4 3 5% 7% 57%	2002
October	1st to 10th	Night	8% 4 2 5% 4 2 4 3 5% 6% 57%	2160
	11th to 20th	Night	14% 5% 2 4 4 2 3 3 5% 7% 51%	2160
	21st to end	Night	18% 8% 2 4 3 2 4 4 4 4 47%	2376
November	1st to 10th	Night	10% 5% 2 4 3 2 4 4 4 5% 56%	2402
	11th to 20th	Night	14% 6% 3 4 4 2 3 4 5% 6% 50%	2470
	21st to end	Night	17% 9% 3 5% 3 3 3 4 4 6% 44%	2588
December	1st to 10th	Night	15% 10% 4 6% 5% 3 5% 5% 4 6% 35%	2660
	11th to 20th	Night	16% 9% 4 6% 5% 3 4 3 5% 6% 41%	3279
	21st to end	Night	19% 21% 5% 8% 7% 3 4 3 3 4 22%	4884

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	49% 3 10% 22% 14% 2	1518
	11th to 20th	Day	53% 3 11% 25% 8%	1594
	21st to end	Day	49% 2 13% 23% 11% 2	1782
February	1st to 10th	Day	52% 3 11% 22% 10% 1	1620
	11th to 20th	Day	48% 3 12% 21% 15% 2	1703
	21st to end	Day	50% 2 9% 24% 12% 3	1480
March	1st to 10th	Day	46% 3 9% 26% 14% 2	1854
	11th to 20th	Day	51% 3 11% 19% 14% 2	1980
	21st to end	Day	57% 3 11% 19% 9% 1	2271
April	1st to 10th	Day	42% 3 11% 27% 17% 1	2160
	11th to 20th	Day	46% 3 8% 26% 14% 3	2134
	21st to end	Day	47% 3 12% 24% 14% 1	2160
May	1st to 10th	Day	46% 4 14% 26% 10% 1	2215
	11th to 20th	Day	43% 4 13% 23% 15% 1	2483
	21st to end	Day	42% 5% 13% 23% 14% 2	2725
June	1st to 10th	Day	32% 4 14% 32% 16% 2	2520
	11th to 20th	Day	31% 4 13% 27% 22% 4	2520
	21st to end	Day	29% 5% 18% 26% 16% 5%	2520
July	1st to 10th	Day	34% 4 15% 30% 14% 4	2451
	11th to 20th	Day	28% 4 15% 30% 20% 3	2445
	21st to end	Day	33% 4 13% 32% 16% 2	2446
August	1st to 10th	Day	36% 5% 14% 29% 16% 1	2314
	11th to 20th	Day	37% 5% 13% 29% 14% 1	2155
	21st to end	Day	31% 4 12% 27% 21% 6%	2376
September	1st to 10th	Day	34% 4 9% 29% 20% 5%	2160
	11th to 20th	Day	30% 3 8% 30% 25% 4	2159
	21st to end	Day	29% 4 8% 30% 25% 3	1936
October	1st to 10th	Day	32% 3 9% 28% 24% 4	1800
	11th to 20th	Day	37% 2 8% 26% 23% 5%	1800
	21st to end	Day	43% 2 9% 26% 18% 3	1980
November	1st to 10th	Day	31% 2 13% 27% 21% 5%	1674
	11th to 20th	Day	39% 2 8% 27% 20% 4	1710
	21st to end	Day	46% 2 9% 27% 15%	1587
December	1st to 10th	Day	46% 2 13% 26% 13%	1520
	11th to 20th	Day	46% 2 11% 27% 12% 2	1915
	21st to end	Day	63% 2 9% 16% 8% 1	2783
January	1st to 10th	Night	47% 3 8% 26% 14% 1	2648
	11th to 20th	Night	51% 2 8% 27% 11% 1	2434
	21st to end	Night	49% 2 13% 23% 11% 1	2574
February	1st to 10th	Night	54% 3 10% 21% 11% 2	2340
	11th to 20th	Night	46% 3 9% 22% 17% 3	2152
	21st to end	Night	47% 1 12% 24% 13% 3	1776
March	1st to 10th	Night	45% 3 8% 26% 16% 3	2120
	11th to 20th	Night	50% 3 9% 23% 13% 3	1980
	21st to end	Night	55% 3 11% 21% 9% 1	2084
April	1st to 10th	Night	39% 3 9% 26% 19% 4	1800
	11th to 20th	Night	40% 2 10% 24% 19% 4	1775
	21st to end	Night	44% 3 9% 24% 18% 2	1800
May	1st to 10th	Night	39% 5% 16% 22% 17% 1	1742
	11th to 20th	Night	42% 5% 11% 24% 16% 2	1417
	21st to end	Night	38% 5% 15% 22% 17% 3	1552
June	1st to 10th	Night	29% 3 15% 30% 20% 3	1440
	11th to 20th	Night	29% 4 10% 27% 25% 4	1440
	21st to end	Night	26% 4 15% 29% 19% 7%	1440
July	1st to 10th	Night	30% 4 13% 35% 14% 4	1400
	11th to 20th	Night	25% 3 13% 31% 23% 3	1392
	21st to end	Night	29% 4 12% 34% 20% 2	1628
August	1st to 10th	Night	28% 4 15% 35% 16% 2	1601
	11th to 20th	Night	31% 4 11% 31% 22% 2	1746
	21st to end	Night	26% 4 14% 27% 24% 6%	1980
September	1st to 10th	Night	32% 2 9% 27% 23% 6%	1800
	11th to 20th	Night	30% 3 9% 27% 26% 5%	1800
	21st to end	Night	28% 3 8% 28% 29% 4	2002
October	1st to 10th	Night	30% 3 10% 26% 26% 5%	2160
	11th to 20th	Night	34% 2 6% 29% 22% 6%	2160
	21st to end	Night	42% 2 8% 22% 22% 4	2376
November	1st to 10th	Night	31% 2 11% 27% 21% 6%	2402
	11th to 20th	Night	36% 1 7% 29% 22% 4	2470
	21st to end	Night	43% 2 10% 26% 17% 2	2588
December	1st to 10th	Night	50% 3 10% 25% 11% 1	2660
	11th to 20th	Night	46% 2 9% 26% 16% 1	3281
	21st to end	Night	68% 2 8% 14% 7% 1	4884

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	18% 19% 33% 25% 6%	270
	11th to 20th	Day	29% 14% 35% 19% 3	249
	21st to end	Day	14% 16% 45% 20% 4	264
February	1st to 10th	Day	27% 13% 39% 16% 5%	240
	11th to 20th	Day	23% 15% 37% 17% 8%	240
	21st to end	Day	30% 11% 37% 18% 5%	198
March	1st to 10th	Day	20% 13% 45% 20% 3	240
	11th to 20th	Day	31% 10% 32% 22% 4 1	240
	21st to end	Day	32% 11% 34% 16% 6% 1	357
April	1st to 10th	Day	17% 10% 37% 25% 11% 2	420
	11th to 20th	Day	23% 12% 28% 23% 13% 1	412
	21st to end	Day	21% 11% 30% 28% 8% 2	420
May	1st to 10th	Day	16% 10% 30% 29% 12% 2	447
	11th to 20th	Day	19% 8% 24% 29% 17% 4	625
	21st to end	Day	14% 5% 25% 29% 17% 10%	679
June	1st to 10th	Day	8% 4 14% 32% 30% 12%	630
	11th to 20th	Day	9% 2 17% 33% 31% 7%	630
	21st to end	Day	5% 4 24% 37% 24% 7%	630
July	1st to 10th	Day	10% 1 9% 27% 36% 17%	621
	11th to 20th	Day	6% 3 15% 34% 32% 10%	618
	21st to end	Day	8% 2 12% 32% 35% 11%	684
August	1st to 10th	Day	10% 2 10% 35% 33% 11%	626
	11th to 20th	Day	12% 2 12% 28% 35% 12%	469
	21st to end	Day	8% 2 10% 29% 37% 14%	495
September	1st to 10th	Day	14% 2 12% 32% 28% 12%	450
	11th to 20th	Day	7% 2 12% 30% 32% 16%	450
	21st to end	Day	7% 5% 22% 32% 24% 11%	406
October	1st to 10th	Day	13% 7% 25% 33% 16% 7%	270
	11th to 20th	Day	16% 17% 33% 23% 10% 1	270
	21st to end	Day	26% 15% 28% 22% 9%	297
November	1st to 10th	Day	14% 7% 33% 28% 13% 5%	270
	11th to 20th	Day	16% 17% 30% 21% 14% 2	270
	21st to end	Day	23% 11% 32% 25% 9% 1	270
December	1st to 10th	Day	13% 14% 38% 24% 7% 4	270
	11th to 20th	Day	21% 10% 33% 29% 7%	270
	21st to end	Day	24% 16% 38% 17% 5%	297
January	1st to 10th	Night	18% 13% 36% 27% 7%	950
	11th to 20th	Night	21% 12% 36% 25% 5%	918
	21st to end	Night	18% 13% 38% 27% 3	990
February	1st to 10th	Night	22% 11% 37% 27% 3	900
	11th to 20th	Night	21% 12% 37% 27% 3	756
	21st to end	Night	23% 12% 41% 22% 3	592
March	1st to 10th	Night	20% 11% 39% 26% 4	680
	11th to 20th	Night	21% 9% 32% 29% 8%	540
	21st to end	Night	28% 8% 29% 30% 5%	594
April	1st to 10th	Night	16% 12% 34% 32% 6%	540
	11th to 20th	Night	16% 7% 35% 32% 10%	533
	21st to end	Night	20% 7% 37% 29% 7%	540
May	1st to 10th	Night	16% 6% 27% 40% 10% 1	540
	11th to 20th	Night	18% 5% 24% 35% 18% 1	531
	21st to end	Night	13% 2 19% 42% 22% 2	584
June	1st to 10th	Night	7% 2 18% 41% 30% 2	540
	11th to 20th	Night	8% 2 16% 47% 26% 1	540
	21st to end	Night	5% 2 18% 47% 26% 1	540
July	1st to 10th	Night	11% 2 6% 38% 39% 5%	525
	11th to 20th	Night	6% 1 11% 42% 37% 3	522
	21st to end	Night	8% 1 9% 42% 37% 3	591
August	1st to 10th	Night	7% 1 7% 41% 41% 3	537
	11th to 20th	Night	7% 1 10% 40% 37% 4	534
	21st to end	Night	6% 2 10% 37% 41% 5%	594
September	1st to 10th	Night	13% 3 11% 37% 29% 7%	540
	11th to 20th	Night	11% 2 10% 37% 35% 5%	540
	21st to end	Night	9% 4 21% 34% 28% 5%	702
October	1st to 10th	Night	10% 3 24% 35% 24% 4	720
	11th to 20th	Night	16% 8% 31% 32% 13% 1	720
	21st to end	Night	22% 9% 32% 29% 8%	792
November	1st to 10th	Night	12% 6% 34% 36% 11% 1	740
	11th to 20th	Night	18% 11% 33% 31% 8%	760
	21st to end	Night	21% 9% 34% 29% 7%	878
December	1st to 10th	Night	20% 10% 35% 28% 6% 1	950
	11th to 20th	Night	23% 9% 29% 33% 6%	950
	21st to end	Night	27% 12% 33% 25% 3	1045

Page generated at 2024-01-11 03:22:41. Version ac07

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