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 2024-11-25.

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	12% 7% 3 6% 4 4 4 4 6% 7% 43%	101454
	Night	13% 8% 3 6% 4 4 4 3 5% 7% 43%	98105
Transparency	Day	40% 3 11% 27% 17% 2	105086
	Night	41% 2 10% 26% 18% 3	102614
Seeing	Day	14% 8% 24% 28% 19% 6%	15723
	Night	16% 7% 27% 33% 15% 1	25546

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% 6% 11% 5% 4 4 4 5% 7% 31%	2527
	11th to 20th	Day	12% 10% 4 9% 6% 7% 4 3 5% 6% 34%	2758
	21st to end	Day	20% 16% 8% 7% 5% 3 3 2 4 4 28%	3135
February	1st to 10th	Day	16% 11% 5% 8% 4 4 4 3 5% 6% 35%	1710
	11th to 20th	Day	14% 9% 3 7% 4 5% 4 4 5% 6% 38%	1790
	21st to end	Day	16% 12% 3 7% 4 3 3 3 4 5% 40%	1570
March	1st to 10th	Day	17% 12% 2 6% 3 3 3 2 3 4 43%	3230
	11th to 20th	Day	11% 8% 2 4 3 4 4 3 6% 6% 48%	3480
	21st to end	Day	18% 9% 3 7% 5% 4 5% 4 5% 7% 33%	3990
April	1st to 10th	Day	13% 8% 2 6% 5% 4 5% 3 5% 6% 43%	2280
	11th to 20th	Day	16% 10% 2 6% 4 3 4 3 5% 5% 42%	2254
	21st to end	Day	19% 7% 3 7% 5% 4 3 4 5% 7% 37%	2280
May	1st to 10th	Day	13% 7% 3 8% 6% 4 5% 5% 7% 9% 33%	3876
	11th to 20th	Day	17% 8% 3 7% 4 4 4 3 5% 7% 38%	4399
	21st to end	Day	11% 6% 3 5% 4 4 4 4 6% 7% 46%	4824
June	1st to 10th	Day	7% 4 2 5% 3 5% 5% 5% 7% 9% 48%	2660
	11th to 20th	Day	8% 4 1 4 4 5% 4 4 7% 8% 51%	2660
	21st to end	Day	6% 4 1 5% 5% 5% 6% 5% 8% 9% 47%	2660
July	1st to 10th	Day	13% 6% 2 6% 4 5% 5% 4 7% 9% 40%	4440
	11th to 20th	Day	5% 4 2 5% 4 4 5% 4 7% 10% 49%	4440
	21st to end	Day	7% 5% 2 6% 5% 6% 6% 5% 8% 11% 40%	4537
August	1st to 10th	Day	5% 4 2 5% 3 5% 5% 5% 7% 9% 50%	4104
	11th to 20th	Day	14% 4 2 6% 4 4 4 4 6% 8% 43%	3772
	21st to end	Day	6% 4 2 5% 4 4 5% 3 6% 11% 50%	4180
September	1st to 10th	Day	13% 5% 1 5% 4 3 3 3 4 7% 53%	2280
	11th to 20th	Day	10% 4 2 5% 4 3 4 3 6% 8% 51%	2278
	21st to end	Day	7% 5% 2 6% 4 4 4 3 5% 8% 52%	2043
October	1st to 10th	Day	11% 4 2 5% 3 3 3 2 4 6% 56%	1900
	11th to 20th	Day	15% 7% 2 5% 3 3 2 3 3 5% 53%	1900
	21st to end	Day	17% 9% 2 6% 3 3 3 3 4 4 47%	2090
November	1st to 10th	Day	12% 6% 2 4 3 3 3 3 5% 6% 53%	1764
	11th to 20th	Day	15% 7% 4 5% 4 4 3 3 4 7% 46%	1800
	21st to end	Day	15% 9% 3 7% 4 3 3 2 4 7% 41%	1622
December	1st to 10th	Day	12% 12% 4 7% 4 3 3 3 4 6% 41%	1520
	11th to 20th	Day	14% 9% 4 6% 4 4 4 3 6% 6% 39%	1918
	21st to end	Day	19% 14% 5% 11% 5% 4 5% 4 4 5% 25%	2783
January	1st to 10th	Night	14% 10% 7% 10% 5% 4 4 3 4 5% 34%	4428
	11th to 20th	Night	13% 11% 4 11% 6% 6% 6% 4 4 4 30%	4207
	21st to end	Night	22% 17% 5% 7% 4 4 3 2 5% 6% 26%	4532
February	1st to 10th	Night	15% 12% 5% 9% 5% 5% 4 3 4 5% 35%	2470
	11th to 20th	Night	15% 7% 4 6% 4 5% 4 3 5% 6% 41%	2274
	21st to end	Night	16% 9% 4 7% 4 3 4 3 4 4 42%	1884
March	1st to 10th	Night	21% 11% 2 5% 3 3 3 2 4 4 43%	3651
	11th to 20th	Night	14% 6% 2 5% 3 3 3 2 4 7% 50%	3480
	21st to end	Night	18% 10% 4 8% 5% 4 4 4 4 6% 33%	3640
April	1st to 10th	Night	12% 6% 3 7% 5% 3 4 3 4 7% 46%	1900
	11th to 20th	Night	14% 7% 2 5% 4 3 4 3 6% 7% 45%	1875
	21st to end	Night	18% 9% 2 6% 3 4 3 3 4 6% 42%	1900
May	1st to 10th	Night	17% 7% 2 6% 4 3 4 3 5% 10% 38%	3018
	11th to 20th	Night	14% 9% 2 6% 5% 4 4 3 6% 7% 41%	2506
	21st to end	Night	9% 5% 2 5% 4 4 5% 4 6% 9% 47%	2743
June	1st to 10th	Night	7% 5% 1 5% 3 4 4 4 6% 9% 51%	1520
	11th to 20th	Night	6% 5% 2 5% 3 4 4 3 6% 8% 53%	1520
	21st to end	Night	5% 3 2 5% 4 4 5% 4 8% 9% 51%	1520
July	1st to 10th	Night	12% 5% 2 6% 4 4 4 4 6% 9% 45%	2530
	11th to 20th	Night	4 2 1 4 3 3 4 3 6% 9% 58%	2530
	21st to end	Night	8% 6% 2 7% 5% 4 5% 4 7% 11% 42%	3022
August	1st to 10th	Night	5% 3 1 4 2 4 4 4 5% 8% 61%	2836
	11th to 20th	Night	12% 5% 2 6% 4 3 4 4 4 7% 50%	3058
	21st to end	Night	5% 3 1 4 3 3 4 4 6% 10% 56%	3476
September	1st to 10th	Night	12% 4 2 3 3 3 4 3 4 6% 56%	1900
	11th to 20th	Night	8% 5% 2 6% 3 3 4 3 6% 7% 53%	1900
	21st to end	Night	8% 4 2 5% 4 4 4 3 5% 7% 55%	2114
October	1st to 10th	Night	8% 4 2 5% 3 2 4 3 5% 6% 59%	2280
	11th to 20th	Night	13% 5% 2 5% 3 3 3 2 5% 7% 53%	2280
	21st to end	Night	17% 8% 2 4 3 3 4 3 4 5% 47%	2508
November	1st to 10th	Night	11% 5% 2 5% 3 3 4 3 4 5% 55%	2532
	11th to 20th	Night	13% 6% 3 5% 3 3 3 3 5% 6% 50%	2600
	21st to end	Night	17% 9% 2 5% 3 3 3 3 4 6% 43%	2648
December	1st to 10th	Night	15% 12% 3 6% 5% 4 5% 4 5% 6% 35%	2660
	11th to 20th	Night	16% 10% 3 6% 4 4 3 3 5% 6% 41%	3279
	21st to end	Night	19% 21% 5% 10% 6% 5% 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	53% 2 9% 25% 9% 1	2528
	11th to 20th	Day	51% 2 13% 21% 12%	2758
	21st to end	Day	61% 1 9% 16% 12% 1	3135
February	1st to 10th	Day	52% 3 11% 22% 11% 1	1710
	11th to 20th	Day	46% 3 11% 22% 16% 2	1800
	21st to end	Day	48% 2 8% 24% 14% 4	1570
March	1st to 10th	Day	47% 2 7% 23% 18% 3	3230
	11th to 20th	Day	37% 2 12% 26% 18% 5%	3480
	21st to end	Day	51% 2 15% 23% 8% 1	3990
April	1st to 10th	Day	42% 3 10% 27% 17% 1	2280
	11th to 20th	Day	44% 3 8% 27% 15% 3	2254
	21st to end	Day	46% 3 12% 24% 14% 1	2280
May	1st to 10th	Day	47% 3 14% 26% 10% 1	3911
	11th to 20th	Day	47% 2 11% 27% 12% 1	4403
	21st to end	Day	38% 3 9% 28% 21% 1	4837
June	1st to 10th	Day	32% 4 14% 32% 16% 3	2660
	11th to 20th	Day	30% 4 12% 29% 22% 4	2660
	21st to end	Day	29% 5% 18% 27% 16% 4	2660
July	1st to 10th	Day	40% 4 11% 29% 14% 2	4371
	11th to 20th	Day	30% 3 13% 32% 20% 2	4365
	21st to end	Day	36% 5% 20% 27% 11% 1	4394
August	1st to 10th	Day	29% 4 14% 39% 14% 1	4090
	11th to 20th	Day	39% 4 12% 27% 17% 1	3808
	21st to end	Day	30% 3 15% 34% 15% 3	4179
September	1st to 10th	Day	33% 3 9% 28% 22% 5%	2280
	11th to 20th	Day	32% 3 8% 29% 25% 4	2278
	21st to end	Day	31% 4 8% 29% 24% 3	2043
October	1st to 10th	Day	18% 2 5% 20% 47% 7%	3160
	11th to 20th	Day	24% 1 6% 22% 39% 8%	3140
	21st to end	Day	35% 1 7% 29% 26% 2	3428
November	1st to 10th	Day	32% 2 13% 27% 21% 5%	1764
	11th to 20th	Day	39% 2 8% 26% 20% 5%	1800
	21st to end	Day	46% 2 9% 27% 15%	1622
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	53% 2 9% 26% 9% 1	4428
	11th to 20th	Night	58% 1 8% 22% 10% 1	4207
	21st to end	Night	62% 1 8% 21% 7% 1	4532
February	1st to 10th	Night	53% 3 10% 21% 12% 2	2470
	11th to 20th	Night	46% 3 9% 23% 18% 3	2275
	21st to end	Night	46% 1 11% 23% 15% 3	1884
March	1st to 10th	Night	48% 2 7% 26% 16% 2	3651
	11th to 20th	Night	37% 2 11% 24% 22% 5%	3480
	21st to end	Night	54% 2 10% 28% 7%	3640
April	1st to 10th	Night	39% 3 9% 26% 19% 4	1900
	11th to 20th	Night	39% 2 9% 25% 20% 4	1875
	21st to end	Night	44% 3 9% 24% 18% 2	1900
May	1st to 10th	Night	43% 3 18% 21% 15% 1	3048
	11th to 20th	Night	44% 3 12% 28% 12% 1	2507
	21st to end	Night	35% 3 12% 26% 22% 2	2751
June	1st to 10th	Night	30% 3 15% 29% 20% 3	1520
	11th to 20th	Night	28% 4 10% 28% 26% 4	1520
	21st to end	Night	26% 4 15% 29% 19% 7%	1520
July	1st to 10th	Night	38% 3 10% 33% 13% 2	2490
	11th to 20th	Night	23% 3 11% 38% 22% 2	2482
	21st to end	Night	37% 4 17% 27% 13% 2	2926
August	1st to 10th	Night	23% 3 16% 38% 19% 1	2826
	11th to 20th	Night	36% 3 11% 28% 20% 2	3088
	21st to end	Night	25% 3 17% 35% 18% 3	3476
September	1st to 10th	Night	31% 2 9% 26% 25% 6%	1900
	11th to 20th	Night	31% 3 8% 26% 26% 5%	1900
	21st to end	Night	30% 3 8% 27% 27% 4	2114
October	1st to 10th	Night	18% 2 6% 21% 47% 7%	3800
	11th to 20th	Night	23% 2 6% 24% 37% 9%	3779
	21st to end	Night	32% 2 8% 27% 26% 5%	4120
November	1st to 10th	Night	32% 2 11% 27% 21% 6%	2532
	11th to 20th	Night	37% 2 7% 29% 22% 4	2600
	21st to end	Night	43% 2 10% 26% 16% 2	2648
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	27% 16% 34% 19% 3	270
	21st to end	Day	16% 14% 43% 21% 5%	297
February	1st to 10th	Day	24% 13% 39% 19% 5%	270
	11th to 20th	Day	21% 14% 37% 19% 8% 1	270
	21st to end	Day	27% 12% 39% 18% 4	225
March	1st to 10th	Day	20% 11% 46% 20% 3	270
	11th to 20th	Day	27% 12% 33% 22% 4 1	270
	21st to end	Day	31% 11% 35% 17% 6% 1	396
April	1st to 10th	Day	18% 10% 37% 24% 10% 2	460
	11th to 20th	Day	21% 13% 29% 22% 13% 1	452
	21st to end	Day	20% 12% 31% 27% 8% 2	460
May	1st to 10th	Day	15% 11% 30% 29% 12% 2	489
	11th to 20th	Day	18% 8% 23% 29% 17% 4	675
	21st to end	Day	13% 6% 25% 29% 16% 10%	734
June	1st to 10th	Day	8% 4 16% 32% 28% 11%	680
	11th to 20th	Day	9% 2 17% 35% 30% 7%	680
	21st to end	Day	5% 4 25% 37% 23% 6%	680
July	1st to 10th	Day	11% 2 9% 29% 34% 15%	671
	11th to 20th	Day	6% 3 15% 35% 32% 10%	668
	21st to end	Day	8% 2 13% 32% 34% 11%	739
August	1st to 10th	Day	9% 2 11% 35% 33% 10%	676
	11th to 20th	Day	13% 3 14% 28% 32% 11%	510
	21st to end	Day	8% 2 10% 29% 37% 14%	539
September	1st to 10th	Day	12% 2 12% 31% 29% 13%	490
	11th to 20th	Day	8% 2 12% 30% 32% 16%	490
	21st to end	Day	9% 5% 22% 31% 22% 11%	443
October	1st to 10th	Day	11% 6% 24% 31% 18% 9%	300
	11th to 20th	Day	15% 16% 32% 23% 12% 2	300
	21st to end	Day	24% 16% 28% 23% 8%	330
November	1st to 10th	Day	16% 7% 32% 28% 12% 5%	300
	11th to 20th	Day	17% 17% 32% 19% 13% 2	300
	21st to end	Day	23% 10% 32% 25% 9% 1	282
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% 13% 36% 25% 5%	950
	21st to end	Night	20% 13% 37% 27% 3	1045
February	1st to 10th	Night	21% 11% 36% 28% 3	950
	11th to 20th	Night	20% 12% 37% 28% 3	799
	21st to end	Night	22% 12% 41% 22% 2	628
March	1st to 10th	Night	20% 11% 39% 26% 4	717
	11th to 20th	Night	20% 9% 33% 29% 8%	570
	21st to end	Night	27% 8% 30% 30% 5%	627
April	1st to 10th	Night	16% 12% 35% 31% 6%	570
	11th to 20th	Night	16% 7% 35% 32% 10%	563
	21st to end	Night	20% 7% 38% 29% 7%	570
May	1st to 10th	Night	16% 6% 28% 39% 10% 1	570
	11th to 20th	Night	17% 4 24% 35% 18% 1	561
	21st to end	Night	13% 2 19% 43% 21% 2	617
June	1st to 10th	Night	8% 2 18% 41% 29% 2	570
	11th to 20th	Night	8% 2 16% 48% 25% 1	570
	21st to end	Night	5% 2 18% 48% 26% 1	570
July	1st to 10th	Night	11% 2 7% 37% 38% 5%	555
	11th to 20th	Night	6% 1 11% 42% 38% 3	552
	21st to end	Night	8% 2 9% 41% 37% 3	624
August	1st to 10th	Night	8% 2 7% 41% 40% 3	567
	11th to 20th	Night	8% 2 10% 41% 36% 4	564
	21st to end	Night	6% 1 9% 37% 41% 5%	627
September	1st to 10th	Night	13% 3 11% 37% 30% 7%	570
	11th to 20th	Night	11% 2 10% 37% 36% 5%	570
	21st to end	Night	10% 5% 21% 33% 27% 5%	741
October	1st to 10th	Night	9% 3 23% 36% 24% 4	760
	11th to 20th	Night	16% 7% 31% 31% 14% 1	760
	21st to end	Night	21% 9% 32% 30% 8%	836
November	1st to 10th	Night	13% 6% 33% 36% 11% 1	780
	11th to 20th	Night	18% 11% 33% 31% 7%	800
	21st to end	Night	21% 10% 34% 29% 7%	898
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 2024-11-22 07:02:29. Version ac07

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