Camp Floyd State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Camp Floyd State Park clear sky chart from 2005-11-06 to 2025-04-26.

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 6% 2 6% 5% 4 5% 4 6% 8% 51%	117833
	Night	4 6% 2 6% 4 4 5% 4 6% 7% 51%	119724
Transparency	Day	27% 8% 11% 20% 20% 14%	117599
	Night	28% 8% 12% 22% 19% 11%	119547
Seeing	Day	7% 8% 20% 31% 24% 9%	15362
	Night	7% 5% 16% 42% 27% 3	25932

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 8% 3 12% 7% 7% 8% 6% 9% 9% 29%	4098
	11th to 20th	Day	3 9% 4 13% 9% 7% 8% 6% 7% 6% 27%	4100
	21st to end	Day	4 12% 4 8% 6% 4 4 4 6% 8% 39%	4510
February	1st to 10th	Day	5% 10% 4 11% 7% 6% 6% 4 6% 9% 32%	1800
	11th to 20th	Day	5% 9% 4 9% 8% 6% 6% 5% 6% 9% 34%	1853
	21st to end	Day	4 11% 4 9% 7% 5% 4 4 7% 9% 36%	1650
March	1st to 10th	Day	3 10% 4 9% 6% 5% 6% 4 6% 7% 40%	4815
	11th to 20th	Day	3 8% 3 8% 6% 6% 6% 5% 7% 8% 40%	5000
	21st to end	Day	5% 10% 4 11% 8% 7% 7% 5% 6% 7% 30%	5486
April	1st to 10th	Day	5% 7% 3 8% 5% 4 5% 5% 6% 7% 44%	2200
	11th to 20th	Day	6% 7% 3 7% 6% 5% 5% 4 6% 7% 46%	2537
	21st to end	Day	5% 6% 4 7% 5% 3 4 4 5% 8% 49%	2537
May	1st to 10th	Day	7% 7% 2 7% 5% 6% 6% 5% 7% 8% 41%	4110
	11th to 20th	Day	4 3 1 4 3 4 4 4 7% 9% 57%	4071
	21st to end	Day	5% 4 2 6% 4 4 5% 4 7% 9% 52%	4477
June	1st to 10th	Day	3 2 2 3 4 4 4 4 6% 8% 59%	2470
	11th to 20th	Day	4 3 1 4 3 3 3 3 5% 6% 64%	2470
	21st to end	Day	2 1 1 3 2 3 4 3 5% 5% 72%	2470
July	1st to 10th	Day	1 2 1 1 2 2 2 3 4 5% 78%	4110
	11th to 20th	Day	2 2 1 4 4 5% 5% 5% 8% 10% 54%	4110
	21st to end	Day	2 2 1 3 3 3 4 4 6% 9% 64%	4454
August	1st to 10th	Day	1 2 1 3 3 4 5% 4 7% 8% 61%	4092
	11th to 20th	Day	2 1 1 3 4 4 5% 4 5% 7% 65%	4028
	21st to end	Day	2 2 1 3 3 2 3 3 5% 6% 71%	4498
September	1st to 10th	Day	2 2 1 3 2 3 4 3 5% 7% 70%	2117
	11th to 20th	Day	3 2 1 3 3 2 3 3 5% 7% 66%	2090
	21st to end	Day	4 2 1 4 2 2 3 3 4 6% 69%	2090
October	1st to 10th	Day	3 3 1 3 3 2 3 2 4 5% 70%	3348
	11th to 20th	Day	5% 5% 2 5% 3 3 3 3 4 7% 59%	3150
	21st to end	Day	5% 6% 2 5% 2 2 3 2 4 6% 62%	3414
November	1st to 10th	Day	6% 6% 2 6% 4 4 5% 3 5% 8% 49%	1764
	11th to 20th	Day	7% 6% 2 7% 4 5% 4 3 6% 8% 48%	1800
	21st to end	Day	4 8% 3 7% 6% 5% 6% 5% 7% 7% 41%	1761
December	1st to 10th	Day	3 6% 2 5% 4 3 3 3 5% 10% 55%	2620
	11th to 20th	Day	4 9% 3 7% 5% 5% 6% 5% 7% 10% 38%	3223
	21st to end	Day	5% 11% 4 9% 7% 7% 7% 5% 8% 8% 28%	4510
January	1st to 10th	Night	4 9% 4 10% 6% 5% 5% 5% 7% 10% 35%	5867
	11th to 20th	Night	3 9% 4 10% 8% 8% 8% 5% 7% 8% 31%	5880
	21st to end	Night	4 10% 4 9% 5% 4 4 3 5% 8% 44%	6468
February	1st to 10th	Night	5% 9% 4 8% 5% 5% 5% 6% 7% 9% 37%	2600
	11th to 20th	Night	5% 9% 3 8% 5% 6% 5% 4 6% 7% 44%	2432
	21st to end	Night	3 9% 3 8% 6% 4 5% 4 7% 6% 44%	1980
March	1st to 10th	Night	5% 9% 3 8% 6% 5% 5% 4 5% 6% 42%	5078
	11th to 20th	Night	4 8% 3 9% 5% 5% 5% 4 6% 8% 43%	5000
	21st to end	Night	4 9% 3 8% 5% 5% 6% 4 6% 6% 45%	5489
April	1st to 10th	Night	7% 9% 2 6% 4 4 4 3 5% 6% 52%	2199
	11th to 20th	Night	4 5% 2 5% 5% 4 5% 5% 6% 6% 52%	1807
	21st to end	Night	6% 5% 2 5% 4 4 4 4 6% 8% 51%	1759
May	1st to 10th	Night	8% 6% 2 6% 4 4 6% 5% 6% 6% 47%	2860
	11th to 20th	Night	4 3 1 4 3 4 4 3 6% 7% 62%	2834
	21st to end	Night	5% 4 2 5% 4 4 4 3 6% 7% 56%	3110
June	1st to 10th	Night	3 3 2 4 3 4 4 4 5% 9% 59%	1710
	11th to 20th	Night	3 4 1 3 2 2 3 3 4 5% 68%	1710
	21st to end	Night	2 2 1 3 3 4 4 4 5% 7% 66%	1710
July	1st to 10th	Night	2 2 1 3 2 2 3 2 4 4 73%	2860
	11th to 20th	Night	2 3 2 5% 4 6% 5% 5% 8% 10% 50%	2860
	21st to end	Night	2 3 2 6% 4 4 4 3 5% 7% 59%	3109
August	1st to 10th	Night	2 2 1 4 3 5% 4 4 6% 8% 59%	2847
	11th to 20th	Night	2 2 2 5% 3 3 4 4 6% 6% 63%	2811
	21st to end	Night	3 2 1 2 2 3 3 3 4 5% 71%	3168
September	1st to 10th	Night	3 2 1 3 2 3 3 3 4 6% 70%	2060
	11th to 20th	Night	3 3 1 4 3 4 3 2 5% 7% 66%	2090
	21st to end	Night	4 3 1 4 2 2 2 2 3 4 72%	2090
October	1st to 10th	Night	3 2 1 3 2 2 3 2 4 5% 72%	3614
	11th to 20th	Night	6% 5% 2 4 3 3 4 3 4 5% 61%	3778
	21st to end	Night	5% 5% 2 4 3 3 3 3 6% 7% 58%	4140
November	1st to 10th	Night	6% 7% 2 5% 3 3 3 3 5% 8% 55%	2535
	11th to 20th	Night	5% 4 2 5% 4 4 4 4 6% 7% 54%	2600
	21st to end	Night	5% 7% 3 6% 4 4 4 5% 6% 7% 50%	2611
December	1st to 10th	Night	3 5% 2 5% 4 3 4 3 6% 7% 60%	4570
	11th to 20th	Night	6% 9% 4 6% 5% 4 4 4 7% 9% 43%	5020
	21st to end	Night	5% 10% 4 10% 7% 7% 7% 5% 7% 8% 31%	6468

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	40% 15% 22% 16% 8% 1	4099
	11th to 20th	Day	43% 12% 18% 18% 6% 3	4100
	21st to end	Day	38% 8% 17% 18% 18% 1	4510
February	1st to 10th	Day	46% 9% 15% 17% 12% 2	1800
	11th to 20th	Day	42% 11% 14% 20% 12% 1	1862
	21st to end	Day	38% 12% 13% 22% 13% 2	1650
March	1st to 10th	Day	33% 11% 13% 23% 14% 5%	4815
	11th to 20th	Day	31% 11% 14% 28% 15% 2	5000
	21st to end	Day	42% 15% 15% 19% 9% 1	5486
April	1st to 10th	Day	35% 8% 13% 21% 16% 7%	2200
	11th to 20th	Day	34% 9% 10% 23% 20% 5%	2540
	21st to end	Day	30% 7% 11% 24% 23% 4	2537
May	1st to 10th	Day	30% 11% 11% 21% 21% 6%	4110
	11th to 20th	Day	19% 7% 9% 27% 32% 6%	4074
	21st to end	Day	23% 9% 10% 24% 27% 7%	4477
June	1st to 10th	Day	20% 6% 8% 19% 31% 14%	2470
	11th to 20th	Day	19% 6% 6% 15% 30% 25%	2470
	21st to end	Day	13% 4 4 11% 27% 41%	2470
July	1st to 10th	Day	10% 3 3 7% 14% 63%	4046
	11th to 20th	Day	17% 7% 8% 13% 23% 32%	4041
	21st to end	Day	14% 7% 7% 11% 23% 38%	4314
August	1st to 10th	Day	16% 6% 7% 18% 25% 27%	4078
	11th to 20th	Day	16% 6% 6% 13% 31% 28%	4067
	21st to end	Day	13% 5% 5% 13% 26% 37%	4497
September	1st to 10th	Day	13% 6% 6% 14% 28% 33%	2117
	11th to 20th	Day	16% 6% 8% 19% 27% 25%	2090
	21st to end	Day	16% 5% 5% 20% 31% 23%	2090
October	1st to 10th	Day	18% 4 5% 12% 37% 23%	3348
	11th to 20th	Day	24% 5% 7% 24% 28% 11%	3150
	21st to end	Day	24% 4 10% 28% 28% 5%	3414
November	1st to 10th	Day	32% 8% 11% 25% 20% 5%	1764
	11th to 20th	Day	32% 8% 13% 29% 17% 1	1800
	21st to end	Day	36% 11% 13% 24% 14% 2	1761
December	1st to 10th	Day	24% 6% 15% 45% 9% 1	2620
	11th to 20th	Day	34% 11% 19% 26% 10%	3222
	21st to end	Day	44% 11% 16% 19% 11%	4510
January	1st to 10th	Night	36% 12% 22% 20% 9%	5867
	11th to 20th	Night	40% 12% 18% 21% 8% 2	5880
	21st to end	Night	34% 9% 17% 25% 15% 1	6468
February	1st to 10th	Night	38% 10% 19% 22% 9% 2	2600
	11th to 20th	Night	37% 7% 15% 24% 16% 1	2433
	21st to end	Night	35% 9% 12% 27% 14% 3	1980
March	1st to 10th	Night	35% 9% 11% 27% 15% 3	5078
	11th to 20th	Night	31% 10% 11% 27% 18% 2	5000
	21st to end	Night	33% 10% 18% 23% 16% 2	5489
April	1st to 10th	Night	32% 6% 10% 26% 19% 7%	2199
	11th to 20th	Night	28% 7% 10% 26% 24% 5%	1807
	21st to end	Night	28% 8% 13% 25% 23% 3	1759
May	1st to 10th	Night	27% 10% 10% 22% 24% 6%	2860
	11th to 20th	Night	19% 6% 9% 27% 31% 8%	2835
	21st to end	Night	24% 6% 10% 27% 29% 4	3110
June	1st to 10th	Night	22% 7% 8% 20% 29% 14%	1710
	11th to 20th	Night	17% 6% 6% 16% 31% 24%	1710
	21st to end	Night	15% 6% 4 9% 26% 40%	1710
July	1st to 10th	Night	14% 4 4 7% 10% 62%	2815
	11th to 20th	Night	23% 8% 7% 9% 22% 31%	2806
	21st to end	Night	23% 5% 8% 10% 21% 34%	3011
August	1st to 10th	Night	19% 7% 8% 15% 22% 29%	2838
	11th to 20th	Night	18% 7% 7% 13% 26% 27%	2838
	21st to end	Night	15% 5% 6% 10% 25% 39%	3168
September	1st to 10th	Night	16% 4 5% 14% 26% 34%	2060
	11th to 20th	Night	18% 6% 7% 17% 26% 26%	2090
	21st to end	Night	18% 3 4 17% 32% 27%	2090
October	1st to 10th	Night	14% 4 6% 14% 35% 28%	3614
	11th to 20th	Night	24% 4 6% 26% 28% 12%	3778
	21st to end	Night	22% 6% 8% 30% 28% 6%	4140
November	1st to 10th	Night	28% 7% 10% 27% 23% 6%	2535
	11th to 20th	Night	26% 7% 13% 33% 18% 3	2600
	21st to end	Night	30% 7% 13% 30% 17% 3	2611
December	1st to 10th	Night	23% 5% 18% 39% 13% 1	4570
	11th to 20th	Night	34% 7% 24% 25% 9%	5020
	21st to end	Night	42% 12% 18% 19% 9%	6468

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	15% 6% 18% 35% 18% 8%	300
	11th to 20th	Day	7% 4 23% 36% 23% 7%	300
	21st to end	Day	8% 6% 15% 40% 24% 8%	330
February	1st to 10th	Day	11% 11% 27% 33% 13% 5%	300
	11th to 20th	Day	9% 8% 27% 34% 19% 3	398
	21st to end	Day	7% 10% 26% 37% 16% 3	414
March	1st to 10th	Day	10% 12% 22% 34% 17% 4	500
	11th to 20th	Day	9% 11% 29% 28% 19% 4	500
	21st to end	Day	14% 14% 27% 29% 13% 3	550
April	1st to 10th	Day	10% 16% 24% 25% 19% 6%	500
	11th to 20th	Day	10% 17% 28% 25% 16% 4	492
	21st to end	Day	8% 18% 23% 27% 19% 5%	481
May	1st to 10th	Day	7% 13% 27% 32% 16% 6%	463
	11th to 20th	Day	9% 9% 23% 30% 21% 9%	488
	21st to end	Day	7% 10% 19% 25% 27% 11%	529
June	1st to 10th	Day	3 9% 20% 30% 28% 10%	490
	11th to 20th	Day	5% 8% 27% 30% 21% 8%	490
	21st to end	Day	2 5% 26% 33% 27% 8%	490
July	1st to 10th	Day	1 2 19% 37% 28% 12%	486
	11th to 20th	Day	4 2 17% 33% 33% 10%	484
	21st to end	Day	3 1 13% 31% 39% 13%	531
August	1st to 10th	Day	5% 3 16% 35% 30% 11%	487
	11th to 20th	Day	3 4 13% 33% 32% 14%	477
	21st to end	Day	4 3 16% 29% 34% 14%	539
September	1st to 10th	Day	3 3 15% 33% 28% 19%	490
	11th to 20th	Day	5% 8% 19% 26% 29% 14%	490
	21st to end	Day	4 6% 17% 24% 33% 15%	490
October	1st to 10th	Day	6% 6% 19% 23% 27% 18%	413
	11th to 20th	Day	6% 4 17% 28% 29% 15%	300
	21st to end	Day	7% 8% 18% 35% 25% 7%	330
November	1st to 10th	Day	12% 11% 13% 32% 22% 12%	300
	11th to 20th	Day	7% 5% 18% 37% 23% 10%	300
	21st to end	Day	11% 8% 13% 32% 27% 10%	300
December	1st to 10th	Day	7% 5% 12% 40% 26% 10%	300
	11th to 20th	Day	10% 3 15% 43% 22% 6%	300
	21st to end	Day	12% 9% 18% 35% 22% 3	330
January	1st to 10th	Night	13% 4 15% 41% 23% 5%	800
	11th to 20th	Night	8% 4 19% 37% 27% 5%	800
	21st to end	Night	9% 4 16% 41% 25% 4	880
February	1st to 10th	Night	9% 5% 20% 47% 15% 4	800
	11th to 20th	Night	10% 4 19% 46% 19% 2	784
	21st to end	Night	7% 5% 23% 45% 20% 1	660
March	1st to 10th	Night	9% 7% 18% 46% 17% 3	800
	11th to 20th	Night	7% 6% 18% 46% 23% 2	800
	21st to end	Night	8% 8% 23% 44% 15% 2	880
April	1st to 10th	Night	11% 10% 19% 41% 18% 2	799
	11th to 20th	Night	6% 9% 25% 42% 16% 1	593
	21st to end	Night	9% 6% 22% 41% 21% 2	587
May	1st to 10th	Night	6% 7% 25% 38% 22% 2	570
	11th to 20th	Night	7% 5% 15% 40% 28% 4	561
	21st to end	Night	7% 7% 16% 38% 27% 4	617
June	1st to 10th	Night	4 8% 16% 40% 29% 2	570
	11th to 20th	Night	4 9% 20% 41% 25% 1	570
	21st to end	Night	3 4 17% 43% 31% 2	570
July	1st to 10th	Night	4 2 14% 38% 40% 3	555
	11th to 20th	Night	5% 2 11% 42% 37% 3	552
	21st to end	Night	4 1 8% 35% 50% 2	624
August	1st to 10th	Night	4 2 9% 43% 40% 2	567
	11th to 20th	Night	2 2 11% 45% 36% 4	564
	21st to end	Night	3 2 11% 41% 40% 3	627
September	1st to 10th	Night	4 2 10% 36% 41% 6%	730
	11th to 20th	Night	4 4 12% 38% 35% 7%	760
	21st to end	Night	6% 3 12% 35% 37% 8%	760
October	1st to 10th	Night	7% 3 14% 43% 30% 4	760
	11th to 20th	Night	6% 3 12% 43% 31% 5%	760
	21st to end	Night	6% 4 16% 41% 29% 4	836
November	1st to 10th	Night	9% 6% 15% 38% 29% 4	780
	11th to 20th	Night	7% 2 16% 48% 22% 5%	800
	21st to end	Night	8% 3 16% 42% 25% 6%	811
December	1st to 10th	Night	10% 4 14% 47% 22% 3	1000
	11th to 20th	Night	14% 3 15% 45% 21% 2	925
	21st to end	Night	13% 5% 18% 45% 17% 2	880

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