City of Rocks State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the City of Rocks State Park clear sky chart from 2005-11-06 to 2024-12-24.

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 3 1 4 3 3 4 3 5% 7% 64%	105365
	Night	3 3 1 4 3 3 4 3 5% 7% 63%	103515
Transparency	Day	19% 4 7% 15% 28% 28%	105129
	Night	20% 4 6% 15% 28% 26%	103340
Seeing	Day	7% 11% 24% 30% 21% 7%	14616
	Night	5% 5% 25% 38% 23% 4	24679

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	3 6% 1 4 3 3 3 4 4 5% 64%	2858
	11th to 20th	Day	3 3 1 3 2 2 3 3 5% 6% 70%	2860
	21st to end	Day	8% 5% 2 5% 3 3 3 4 6% 7% 55%	3146
February	1st to 10th	Day	3 4 2 4 2 3 3 2 4 5% 68%	1710
	11th to 20th	Day	6% 3 1 3 3 3 3 3 3 6% 65%	1810
	21st to end	Day	4 4 1 3 2 2 3 2 4 5% 68%	1692
March	1st to 10th	Day	2 4 2 5% 3 3 2 3 4 6% 66%	3444
	11th to 20th	Day	5% 5% 2 5% 3 3 4 3 4 6% 60%	3490
	21st to end	Day	1 4 1 4 4 4 5% 5% 7% 9% 56%	3825
April	1st to 10th	Day	2 2 3 2 3 2 3 4 6% 73%	2232
	11th to 20th	Day	3 2 1 2 1 2 2 2 3 5% 78%	2251
	21st to end	Day	2 2 2 1 2 2 2 3 5% 79%	2280
May	1st to 10th	Day	1 1 1 2 1 2 1 2 4 84%	3800
	11th to 20th	Day	2 1 1 2 2 2 3 3 4 6% 74%	3930
	21st to end	Day	1 1 1 1 1 1 2 2 3 87%	4477
June	1st to 10th	Day	3 3 1 3 3 3 3 2 5% 8% 66%	2470
	11th to 20th	Day	2 2 1 2 2 2 3 2 4 6% 73%	2470
	21st to end	Day	3 4 2 4 4 4 5% 4 7% 8% 55%	2470
July	1st to 10th	Day	3 3 1 4 4 5% 5% 4 7% 9% 55%	4110
	11th to 20th	Day	2 2 1 5% 5% 5% 6% 5% 8% 9% 50%	4110
	21st to end	Day	4 4 2 6% 6% 7% 9% 7% 10% 11% 33%	4454
August	1st to 10th	Day	3 3 2 5% 4 5% 7% 5% 8% 11% 47%	4062
	11th to 20th	Day	3 3 1 4 4 4 5% 5% 7% 9% 55%	3726
	21st to end	Day	3 3 2 6% 5% 6% 7% 5% 8% 10% 44%	4180
September	1st to 10th	Day	8% 4 2 6% 4 4 5% 4 7% 8% 48%	2280
	11th to 20th	Day	5% 3 1 4 3 4 4 4 5% 7% 60%	2222
	21st to end	Day	3 2 1 4 2 2 3 3 5% 6% 69%	2024
October	1st to 10th	Day	2 1 1 2 2 2 2 2 4 5% 76%	3170
	11th to 20th	Day	2 3 1 3 2 2 2 2 3 4 75%	3150
	21st to end	Day	1 1 2 1 1 2 1 2 3 85%	3438
November	1st to 10th	Day	2 2 1 3 2 3 3 2 4 6% 73%	1959
	11th to 20th	Day	3 3 1 3 2 2 3 3 5% 6% 71%	2000
	21st to end	Day	5% 5% 2 4 4 3 3 3 5% 7% 61%	2000
December	1st to 10th	Day	5% 3 1 3 3 2 3 4 5% 7% 64%	1833
	11th to 20th	Day	6% 6% 2 6% 3 3 4 2 3 6% 58%	2259
	21st to end	Day	3 4 1 3 3 3 3 3 5% 8% 65%	3173
January	1st to 10th	Night	4 5% 2 4 3 3 3 3 5% 6% 62%	4097
	11th to 20th	Night	3 2 1 2 3 3 3 2 3 5% 73%	4110
	21st to end	Night	10% 6% 2 5% 3 3 4 4 6% 6% 52%	4521
February	1st to 10th	Night	3 3 1 3 2 3 3 4 4 8% 66%	2470
	11th to 20th	Night	5% 4 2 3 3 2 3 2 4 6% 66%	2256
	21st to end	Night	3 4 1 3 2 2 3 4 4 6% 67%	1759
March	1st to 10th	Night	2 3 1 3 2 2 3 3 5% 6% 69%	3430
	11th to 20th	Night	7% 4 2 3 2 3 3 2 4 5% 65%	3490
	21st to end	Night	1 3 1 3 3 3 4 4 6% 9% 62%	3828
April	1st to 10th	Night	2 2 1 2 3 2 3 3 4 7% 73%	1947
	11th to 20th	Night	2 3 1 3 2 2 1 2 4 5% 74%	1877
	21st to end	Night	1 2 1 2 3 2 3 2 4 5% 76%	1900
May	1st to 10th	Night	1 2 1 1 2 2 1 3 4 83%	3170
	11th to 20th	Night	2 2 1 3 2 3 3 3 3 6% 73%	2971
	21st to end	Night	1 1 1 1 1 1 2 2 3 86%	3110
June	1st to 10th	Night	4 3 1 4 3 3 4 3 5% 6% 66%	1710
	11th to 20th	Night	2 2 1 3 3 3 3 3 5% 6% 71%	1710
	21st to end	Night	4 4 1 5% 6% 5% 5% 5% 7% 8% 50%	1710
July	1st to 10th	Night	3 3 2 4 5% 5% 5% 6% 9% 12% 45%	2860
	11th to 20th	Night	2 3 1 6% 6% 6% 8% 6% 9% 13% 40%	2860
	21st to end	Night	4 4 3 9% 6% 7% 7% 6% 10% 14% 31%	3109
August	1st to 10th	Night	2 4 2 6% 6% 6% 8% 6% 10% 14% 36%	2874
	11th to 20th	Night	3 4 2 6% 5% 7% 7% 6% 9% 12% 40%	3113
	21st to end	Night	4 5% 3 9% 7% 7% 8% 7% 8% 11% 31%	3487
September	1st to 10th	Night	5% 4 2 6% 5% 5% 5% 4 7% 9% 48%	1900
	11th to 20th	Night	4 3 1 4 3 4 5% 4 7% 8% 57%	1952
	21st to end	Night	3 3 1 3 2 2 3 3 5% 6% 68%	2154
October	1st to 10th	Night	3 2 1 3 2 2 3 2 4 6% 74%	3800
	11th to 20th	Night	3 2 1 3 2 2 3 2 3 5% 74%	3778
	21st to end	Night	2 1 2 1 2 2 1 3 5% 82%	4120
November	1st to 10th	Night	2 2 1 2 2 2 3 2 4 6% 74%	2340
	11th to 20th	Night	3 2 1 2 2 3 3 2 4 6% 73%	2400
	21st to end	Night	5% 4 1 4 3 3 3 3 4 6% 64%	2400
December	1st to 10th	Night	5% 3 1 3 2 2 3 3 6% 6% 64%	2565
	11th to 20th	Night	4 3 2 6% 4 4 4 3 6% 7% 58%	3171
	21st to end	Night	6% 4 1 4 3 3 3 3 4 5% 65%	4566

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	21% 3 4 14% 39% 19%	2859
	11th to 20th	Day	15% 2 5% 20% 42% 16%	2860
	21st to end	Day	26% 4 5% 24% 27% 14%	3146
February	1st to 10th	Day	19% 2 5% 16% 26% 33%	1710
	11th to 20th	Day	21% 2 4 13% 31% 28%	1820
	21st to end	Day	19% 2 3 9% 30% 37%	1692
March	1st to 10th	Day	21% 2 3 8% 37% 29%	3444
	11th to 20th	Day	24% 4 4 17% 29% 22%	3490
	21st to end	Day	21% 5% 4 13% 36% 21%	3825
April	1st to 10th	Day	13% 2 4 10% 36% 36%	2232
	11th to 20th	Day	12% 1 2 8% 28% 49%	2254
	21st to end	Day	10% 1 3 10% 32% 43%	2280
May	1st to 10th	Day	7% 1 2 6% 23% 60%	3800
	11th to 20th	Day	11% 3 4 8% 28% 46%	3933
	21st to end	Day	5% 1 2 5% 15% 71%	4477
June	1st to 10th	Day	18% 3 3 9% 28% 39%	2470
	11th to 20th	Day	12% 2 2 6% 21% 56%	2470
	21st to end	Day	24% 5% 8% 14% 19% 30%	2470
July	1st to 10th	Day	22% 6% 13% 14% 21% 24%	4046
	11th to 20th	Day	25% 7% 12% 23% 26% 6%	4041
	21st to end	Day	35% 11% 18% 26% 9% 1	4314
August	1st to 10th	Day	26% 8% 13% 30% 19% 4	4048
	11th to 20th	Day	21% 6% 10% 18% 36% 8%	3762
	21st to end	Day	30% 8% 15% 20% 20% 8%	4179
September	1st to 10th	Day	30% 5% 11% 17% 22% 15%	2280
	11th to 20th	Day	22% 5% 8% 17% 28% 21%	2222
	21st to end	Day	16% 4 4 16% 34% 26%	2024
October	1st to 10th	Day	11% 2 6% 10% 27% 43%	3170
	11th to 20th	Day	15% 2 4 11% 34% 35%	3150
	21st to end	Day	8% 1 2 10% 32% 48%	3438
November	1st to 10th	Day	14% 2 5% 16% 35% 28%	1959
	11th to 20th	Day	15% 3 4 16% 30% 31%	2000
	21st to end	Day	23% 3 6% 16% 31% 22%	2000
December	1st to 10th	Day	21% 3 5% 20% 30% 20%	1833
	11th to 20th	Day	29% 2 6% 19% 28% 17%	2258
	21st to end	Day	17% 4 6% 16% 36% 21%	3173
January	1st to 10th	Night	22% 3 4 15% 41% 15%	4097
	11th to 20th	Night	15% 1 4 20% 45% 15%	4110
	21st to end	Night	30% 4 6% 20% 28% 12%	4521
February	1st to 10th	Night	17% 3 5% 17% 27% 30%	2470
	11th to 20th	Night	21% 2 3 16% 31% 28%	2256
	21st to end	Night	19% 3 4 12% 30% 33%	1759
March	1st to 10th	Night	15% 3 3 12% 43% 24%	3430
	11th to 20th	Night	22% 3 3 16% 35% 21%	3490
	21st to end	Night	15% 6% 4 21% 35% 19%	3828
April	1st to 10th	Night	13% 2 4 12% 38% 32%	1947
	11th to 20th	Night	14% 2 3 8% 29% 44%	1877
	21st to end	Night	12% 2 3 12% 33% 38%	1900
May	1st to 10th	Night	8% 1 1 5% 25% 59%	3170
	11th to 20th	Night	13% 4 3 8% 23% 48%	2972
	21st to end	Night	7% 1 2 4 16% 70%	3110
June	1st to 10th	Night	19% 3 4 10% 26% 38%	1710
	11th to 20th	Night	15% 2 3 7% 20% 53%	1710
	21st to end	Night	28% 6% 8% 15% 14% 29%	1710
July	1st to 10th	Night	27% 7% 15% 17% 17% 18%	2815
	11th to 20th	Night	30% 9% 13% 21% 22% 5%	2806
	21st to end	Night	38% 8% 21% 24% 6% 2	3011
August	1st to 10th	Night	31% 10% 16% 29% 10% 4	2865
	11th to 20th	Night	31% 7% 13% 13% 29% 6%	3143
	21st to end	Night	41% 8% 16% 16% 15% 4	3487
September	1st to 10th	Night	30% 7% 11% 17% 18% 16%	1900
	11th to 20th	Night	23% 6% 9% 17% 25% 21%	1952
	21st to end	Night	17% 4 6% 16% 32% 25%	2154
October	1st to 10th	Night	13% 2 6% 9% 29% 41%	3800
	11th to 20th	Night	14% 2 4 13% 30% 37%	3778
	21st to end	Night	9% 1 2 10% 30% 48%	4120
November	1st to 10th	Night	13% 2 4 15% 36% 30%	2340
	11th to 20th	Night	14% 2 4 16% 32% 33%	2400
	21st to end	Night	21% 3 5% 17% 31% 23%	2400
December	1st to 10th	Night	19% 4 5% 21% 29% 21%	2565
	11th to 20th	Night	25% 3 8% 18% 30% 17%	3171
	21st to end	Night	22% 2 5% 16% 34% 21%	4566

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	12% 12% 32% 30% 12% 2	270
	11th to 20th	Day	12% 9% 29% 31% 16% 4	270
	21st to end	Day	7% 12% 29% 32% 14% 4	297
February	1st to 10th	Day	6% 15% 32% 28% 15% 4	270
	11th to 20th	Day	15% 14% 30% 33% 7% 1	270
	21st to end	Day	16% 30% 30% 17% 6% 1	347
March	1st to 10th	Day	12% 25% 33% 22% 7% 1	460
	11th to 20th	Day	15% 20% 27% 27% 10% 2	460
	21st to end	Day	12% 27% 34% 19% 7% 1	506
April	1st to 10th	Day	8% 19% 37% 24% 9% 3	460
	11th to 20th	Day	8% 26% 35% 21% 8% 1	452
	21st to end	Day	9% 19% 38% 22% 10% 2	460
May	1st to 10th	Day	4 20% 39% 24% 11% 1	463
	11th to 20th	Day	3 13% 34% 33% 14% 2	488
	21st to end	Day	3 15% 36% 33% 11% 2	529
June	1st to 10th	Day	6% 6% 30% 39% 17% 3	490
	11th to 20th	Day	3 7% 28% 37% 21% 4	490
	21st to end	Day	3 2 20% 39% 28% 8%	490
July	1st to 10th	Day	6% 1 9% 33% 36% 14%	486
	11th to 20th	Day	6% 5% 27% 41% 20%	484
	21st to end	Day	4 2 5% 23% 44% 23%	531
August	1st to 10th	Day	6% 7% 25% 40% 22%	487
	11th to 20th	Day	4 1 10% 30% 40% 15%	477
	21st to end	Day	4 1 9% 23% 45% 17%	539
September	1st to 10th	Day	11% 2 10% 36% 33% 9%	490
	11th to 20th	Day	5% 1 16% 39% 31% 8%	490
	21st to end	Day	4 6% 18% 39% 26% 7%	424
October	1st to 10th	Day	6% 6% 21% 33% 27% 8%	300
	11th to 20th	Day	9% 7% 20% 35% 24% 5%	300
	21st to end	Day	5% 9% 18% 33% 28% 6%	330
November	1st to 10th	Day	6% 11% 27% 35% 18% 2	300
	11th to 20th	Day	5% 8% 25% 37% 22% 4	300
	21st to end	Day	10% 15% 25% 34% 14% 2	300
December	1st to 10th	Day	7% 12% 26% 36% 18% 2	300
	11th to 20th	Day	9% 12% 27% 35% 14% 3	300
	21st to end	Day	10% 15% 32% 30% 10% 3	306
January	1st to 10th	Night	7% 6% 28% 38% 17% 5%	760
	11th to 20th	Night	6% 6% 30% 37% 18% 4	760
	21st to end	Night	9% 7% 28% 37% 16% 2	836
February	1st to 10th	Night	4 7% 34% 35% 15% 4	760
	11th to 20th	Night	8% 8% 34% 37% 12% 2	744
	21st to end	Night	6% 11% 44% 29% 9% 1	628
March	1st to 10th	Night	6% 10% 39% 33% 11% 1	760
	11th to 20th	Night	7% 9% 32% 36% 14% 3	760
	21st to end	Night	4 12% 37% 35% 11% 1	836
April	1st to 10th	Night	3 8% 44% 35% 8% 1	617
	11th to 20th	Night	4 11% 43% 30% 11% 1	563
	21st to end	Night	3 13% 40% 34% 11% 1	570
May	1st to 10th	Night	3 8% 37% 44% 7% 1	570
	11th to 20th	Night	3 5% 33% 43% 16% 1	561
	21st to end	Night	3 5% 34% 46% 12%	617
June	1st to 10th	Night	4 2 26% 49% 16% 1	570
	11th to 20th	Night	2 3 26% 52% 17% 1	570
	21st to end	Night	5% 3 17% 39% 34% 2	570
July	1st to 10th	Night	7% 1 10% 36% 40% 7%	555
	11th to 20th	Night	4 1 7% 27% 53% 8%	552
	21st to end	Night	5% 5% 26% 53% 10%	624
August	1st to 10th	Night	4 1 4 23% 56% 11%	567
	11th to 20th	Night	4 1 7% 29% 50% 8%	564
	21st to end	Night	5% 1 6% 29% 52% 7%	627
September	1st to 10th	Night	6% 1 7% 38% 45% 4	570
	11th to 20th	Night	5% 1 9% 45% 35% 5%	622
	21st to end	Night	4 1 13% 45% 32% 5%	760
October	1st to 10th	Night	5% 2 18% 48% 24% 3	760
	11th to 20th	Night	5% 3 19% 48% 22% 4	760
	21st to end	Night	3 4 21% 41% 25% 7%	836
November	1st to 10th	Night	4 3 19% 43% 23% 7%	780
	11th to 20th	Night	4 4 22% 43% 24% 4	800
	21st to end	Night	7% 6% 25% 37% 19% 5%	800
December	1st to 10th	Night	6% 4 26% 43% 18% 4	800
	11th to 20th	Night	5% 6% 29% 43% 15% 3	800
	21st to end	Night	9% 7% 25% 39% 16% 3	850

Page generated at 2024-12-21 02:13:48. Version ac07

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