Animal Park at the Conservators Center
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Animal Park at the Conservators Center clear sky chart from 2005-11-06 to 2024-11-28.

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% 6% 2 6% 4 4 4 4 6% 8% 43%	101063
	Night	14% 7% 2 6% 4 4 4 4 5% 7% 44%	98411
Transparency	Day	38% 6% 12% 22% 17% 5%	104713
	Night	38% 5% 10% 21% 19% 6%	102900
Seeing	Day	16% 8% 23% 25% 19% 8%	15380
	Night	16% 8% 26% 32% 17% 2	25635

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	18% 6% 1 4 3 3 3 3 4 5% 51%	2836
	11th to 20th	Day	13% 6% 2 6% 3 3 3 3 4 5% 52%	2840
	21st to end	Day	19% 11% 3 6% 4 3 4 3 3 4 41%	3124
February	1st to 10th	Day	13% 6% 2 7% 4 5% 4 4 6% 7% 43%	1710
	11th to 20th	Day	20% 7% 2 5% 4 4 3 3 4 5% 44%	1673
	21st to end	Day	19% 9% 2 6% 4 4 4 3 5% 6% 39%	1703
March	1st to 10th	Day	21% 7% 2 6% 4 4 3 2 5% 7% 38%	3435
	11th to 20th	Day	10% 5% 1 4 4 3 4 3 4 7% 54%	3480
	21st to end	Day	20% 7% 1 6% 4 3 3 3 4 6% 42%	3815
April	1st to 10th	Day	10% 5% 1 3 3 3 4 3 6% 7% 53%	2188
	11th to 20th	Day	11% 5% 2 5% 4 4 4 3 5% 7% 49%	2254
	21st to end	Day	14% 5% 2 5% 4 4 5% 3 5% 7% 45%	2309
May	1st to 10th	Day	11% 7% 3 8% 6% 6% 5% 4 8% 9% 34%	4082
	11th to 20th	Day	18% 7% 2 8% 4 4 5% 4 6% 8% 33%	4081
	21st to end	Day	7% 4 2 5% 4 5% 5% 4 7% 11% 47%	4476
June	1st to 10th	Day	9% 5% 2 5% 5% 5% 5% 6% 7% 11% 41%	2470
	11th to 20th	Day	8% 5% 2 6% 4 4 5% 4 6% 10% 44%	2470
	21st to end	Day	7% 4 2 6% 6% 5% 6% 5% 7% 10% 42%	2470
July	1st to 10th	Day	7% 5% 2 7% 5% 6% 6% 6% 9% 10% 37%	4120
	11th to 20th	Day	9% 6% 2 7% 6% 5% 5% 5% 8% 12% 34%	4120
	21st to end	Day	10% 8% 4 9% 6% 6% 7% 5% 8% 9% 28%	4466
August	1st to 10th	Day	17% 8% 3 8% 5% 5% 5% 5% 8% 10% 26%	4104
	11th to 20th	Day	8% 5% 2 7% 6% 6% 6% 5% 7% 12% 35%	3980
	21st to end	Day	6% 4 2 5% 4 4 4 4 7% 10% 50%	4180
September	1st to 10th	Day	10% 5% 2 5% 4 4 4 4 6% 8% 48%	2280
	11th to 20th	Day	14% 6% 3 7% 4 4 4 5% 5% 7% 42%	2112
	21st to end	Day	20% 8% 3 6% 3 3 3 3 6% 7% 38%	2070
October	1st to 10th	Day	15% 5% 2 5% 3 3 3 2 3 6% 52%	1900
	11th to 20th	Day	13% 4 2 4 3 3 4 2 5% 5% 55%	1900
	21st to end	Day	11% 5% 2 5% 4 3 3 2 3 5% 57%	2090
November	1st to 10th	Day	13% 6% 2 5% 3 3 3 3 4 5% 53%	1957
	11th to 20th	Day	13% 5% 2 4 4 3 3 3 5% 6% 52%	1939
	21st to end	Day	13% 5% 2 5% 4 3 4 3 6% 7% 49%	1704
December	1st to 10th	Day	16% 7% 2 6% 4 4 4 4 5% 6% 40%	1520
	11th to 20th	Day	15% 5% 2 4 2 2 3 3 4 6% 55%	2081
	21st to end	Day	17% 6% 2 5% 4 4 4 4 5% 8% 41%	3124
January	1st to 10th	Night	14% 7% 2 5% 3 4 4 3 5% 5% 48%	4109
	11th to 20th	Night	14% 8% 2 5% 4 3 3 3 5% 5% 48%	4120
	21st to end	Night	18% 8% 2 6% 4 3 3 3 4 5% 44%	4532
February	1st to 10th	Night	16% 6% 2 5% 4 3 5% 4 5% 6% 44%	2470
	11th to 20th	Night	19% 7% 2 5% 4 2 3 3 4 6% 43%	2389
	21st to end	Night	14% 7% 2 4 4 4 5% 3 5% 7% 45%	1750
March	1st to 10th	Night	21% 9% 3 8% 4 4 4 3 4 5% 36%	3418
	11th to 20th	Night	13% 6% 2 5% 4 3 4 3 4 6% 52%	3480
	21st to end	Night	17% 6% 2 5% 4 3 3 3 4 6% 48%	3817
April	1st to 10th	Night	12% 7% 2 5% 4 4 4 3 5% 7% 48%	1990
	11th to 20th	Night	12% 5% 2 5% 4 4 3 3 6% 6% 49%	1875
	21st to end	Night	12% 5% 2 5% 5% 4 5% 4 6% 6% 46%	1886
May	1st to 10th	Night	11% 8% 3 7% 5% 4 4 3 5% 8% 41%	2813
	11th to 20th	Night	18% 9% 3 7% 3 4 3 3 4 7% 40%	2812
	21st to end	Night	8% 5% 2 5% 3 3 4 4 7% 11% 47%	3079
June	1st to 10th	Night	9% 5% 2 5% 4 5% 5% 6% 8% 11% 40%	1710
	11th to 20th	Night	8% 5% 2 7% 6% 5% 4 4 6% 12% 42%	1710
	21st to end	Night	6% 6% 2 5% 5% 5% 5% 5% 8% 12% 40%	1710
July	1st to 10th	Night	7% 4 3 9% 6% 7% 8% 5% 8% 10% 34%	2840
	11th to 20th	Night	10% 7% 3 8% 5% 5% 6% 5% 7% 10% 34%	2840
	21st to end	Night	13% 9% 4 9% 6% 5% 5% 4 7% 9% 30%	3087
August	1st to 10th	Night	19% 8% 3 7% 5% 5% 6% 5% 9% 10% 24%	2825
	11th to 20th	Night	8% 5% 2 6% 5% 6% 5% 5% 7% 10% 41%	2816
	21st to end	Night	6% 4 2 5% 4 5% 5% 4 7% 8% 50%	3476
September	1st to 10th	Night	10% 6% 2 7% 4 3 4 4 6% 8% 46%	1900
	11th to 20th	Night	14% 7% 3 6% 4 4 4 4 5% 7% 43%	2063
	21st to end	Night	18% 8% 3 6% 4 4 4 4 5% 5% 39%	2109
October	1st to 10th	Night	15% 6% 2 5% 4 4 4 3 4 6% 48%	2280
	11th to 20th	Night	13% 6% 2 4 4 3 3 3 4 5% 55%	2280
	21st to end	Night	11% 5% 2 4 3 4 4 2 4 4 57%	2508
November	1st to 10th	Night	14% 6% 2 5% 4 3 3 3 4 5% 53%	2341
	11th to 20th	Night	13% 6% 2 5% 4 4 4 3 5% 6% 51%	2458
	21st to end	Night	13% 4 2 5% 3 3 3 4 5% 6% 52%	2622
December	1st to 10th	Night	16% 8% 3 7% 4 4 4 3 5% 5% 42%	2660
	11th to 20th	Night	16% 7% 2 5% 4 3 3 3 4 5% 49%	3104
	21st to end	Night	18% 6% 2 5% 3 3 3 4 5% 8% 43%	4532

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	35% 4 5% 29% 22% 6%	2837
	11th to 20th	Day	36% 3 6% 19% 31% 5%	2840
	21st to end	Day	47% 4 6% 18% 21% 4	3124
February	1st to 10th	Day	40% 5% 10% 21% 20% 5%	1710
	11th to 20th	Day	44% 3 6% 21% 19% 6%	1682
	21st to end	Day	45% 5% 11% 15% 18% 6%	1703
March	1st to 10th	Day	46% 5% 8% 20% 14% 8%	3435
	11th to 20th	Day	30% 5% 8% 21% 23% 13%	3480
	21st to end	Day	44% 4 9% 20% 19% 3	3815
April	1st to 10th	Day	29% 5% 11% 23% 24% 8%	2188
	11th to 20th	Day	34% 5% 12% 21% 22% 7%	2254
	21st to end	Day	38% 5% 12% 24% 17% 4	2309
May	1st to 10th	Day	44% 8% 16% 20% 10% 2	4120
	11th to 20th	Day	46% 7% 11% 24% 9% 1	4085
	21st to end	Day	30% 7% 18% 24% 19% 3	4489
June	1st to 10th	Day	34% 9% 17% 24% 15% 1	2470
	11th to 20th	Day	34% 6% 18% 24% 15% 2	2470
	21st to end	Day	34% 9% 18% 24% 14% 2	2470
July	1st to 10th	Day	39% 9% 20% 18% 11% 4	4055
	11th to 20th	Day	41% 7% 24% 21% 5% 1	4051
	21st to end	Day	50% 9% 14% 18% 10%	4324
August	1st to 10th	Day	51% 6% 19% 19% 5%	4091
	11th to 20th	Day	40% 6% 22% 22% 9% 1	4019
	21st to end	Day	29% 5% 16% 34% 14% 2	4180
September	1st to 10th	Day	34% 8% 15% 20% 19% 5%	2280
	11th to 20th	Day	40% 6% 10% 20% 20% 3	2112
	21st to end	Day	45% 6% 10% 20% 16% 4	2070
October	1st to 10th	Day	35% 3 6% 20% 26% 10%	3160
	11th to 20th	Day	21% 2 5% 22% 27% 23%	3140
	21st to end	Day	24% 2 9% 26% 25% 14%	3428
November	1st to 10th	Day	34% 4 7% 22% 26% 7%	1957
	11th to 20th	Day	34% 3 8% 22% 26% 7%	1939
	21st to end	Day	34% 4 9% 23% 26% 5%	1704
December	1st to 10th	Day	43% 6% 10% 19% 18% 4	1520
	11th to 20th	Day	32% 3 8% 24% 25% 8%	2078
	21st to end	Day	39% 6% 11% 24% 18% 2	3124
January	1st to 10th	Night	36% 5% 7% 21% 26% 5%	4109
	11th to 20th	Night	38% 5% 7% 19% 26% 6%	4120
	21st to end	Night	44% 4 6% 21% 20% 7%	4532
February	1st to 10th	Night	40% 5% 9% 22% 20% 5%	2470
	11th to 20th	Night	43% 4 8% 17% 21% 7%	2391
	21st to end	Night	39% 4 10% 21% 19% 7%	1750
March	1st to 10th	Night	51% 5% 7% 15% 17% 4	3418
	11th to 20th	Night	33% 5% 6% 16% 25% 15%	3480
	21st to end	Night	38% 4 8% 24% 21% 6%	3817
April	1st to 10th	Night	35% 5% 11% 18% 25% 6%	1990
	11th to 20th	Night	34% 4 9% 23% 22% 7%	1875
	21st to end	Night	37% 6% 12% 23% 18% 5%	1886
May	1st to 10th	Night	41% 8% 15% 22% 12% 2	2840
	11th to 20th	Night	46% 6% 10% 22% 16% 1	2813
	21st to end	Night	28% 8% 18% 27% 16% 3	3087
June	1st to 10th	Night	35% 9% 17% 22% 15% 1	1710
	11th to 20th	Night	35% 8% 17% 24% 14% 2	1710
	21st to end	Night	34% 10% 18% 21% 14% 3	1710
July	1st to 10th	Night	42% 11% 16% 17% 12% 2	2795
	11th to 20th	Night	44% 9% 23% 17% 5% 2	2786
	21st to end	Night	50% 9% 14% 18% 9%	2988
August	1st to 10th	Night	53% 7% 19% 16% 6%	2814
	11th to 20th	Night	37% 6% 21% 26% 10% 1	2843
	21st to end	Night	31% 6% 12% 30% 20% 2	3476
September	1st to 10th	Night	35% 8% 11% 22% 18% 5%	1900
	11th to 20th	Night	40% 7% 11% 18% 21% 3	2063
	21st to end	Night	47% 6% 10% 18% 15% 4	2109
October	1st to 10th	Night	40% 3 7% 19% 25% 6%	3800
	11th to 20th	Night	24% 3 6% 22% 28% 18%	3779
	21st to end	Night	24% 2 6% 28% 25% 16%	4120
November	1st to 10th	Night	35% 3 7% 20% 25% 8%	2341
	11th to 20th	Night	36% 4 7% 18% 26% 10%	2458
	21st to end	Night	33% 3 7% 23% 26% 6%	2622
December	1st to 10th	Night	45% 4 8% 21% 18% 4	2660
	11th to 20th	Night	38% 4 7% 20% 22% 8%	3106
	21st to end	Night	39% 4 8% 24% 22% 2	4532

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	26% 17% 36% 16% 5%	270
	11th to 20th	Day	23% 21% 35% 15% 5%	270
	21st to end	Day	22% 18% 41% 16% 3	297
February	1st to 10th	Day	19% 17% 42% 17% 5%	270
	11th to 20th	Day	35% 17% 35% 9% 4	270
	21st to end	Day	28% 16% 35% 17% 4	358
March	1st to 10th	Day	22% 14% 35% 22% 7%	460
	11th to 20th	Day	19% 15% 42% 17% 6%	460
	21st to end	Day	22% 13% 35% 24% 5% 1	506
April	1st to 10th	Day	18% 16% 33% 22% 10% 1	460
	11th to 20th	Day	13% 18% 27% 26% 12% 4	452
	21st to end	Day	18% 10% 29% 26% 15% 2	460
May	1st to 10th	Day	17% 12% 27% 27% 13% 4	463
	11th to 20th	Day	15% 6% 20% 30% 22% 7%	487
	21st to end	Day	15% 3 18% 25% 28% 10%	529
June	1st to 10th	Day	10% 4 18% 33% 25% 10%	490
	11th to 20th	Day	10% 3 17% 27% 29% 13%	490
	21st to end	Day	9% 3 15% 33% 29% 11%	490
July	1st to 10th	Day	10% 3 7% 28% 34% 19%	485
	11th to 20th	Day	6% 2 9% 26% 39% 18%	484
	21st to end	Day	9% 2 11% 32% 32% 14%	532
August	1st to 10th	Day	15% 3 12% 25% 29% 15%	486
	11th to 20th	Day	10% 3 9% 28% 30% 20%	479
	21st to end	Day	10% 1 9% 25% 33% 22%	539
September	1st to 10th	Day	14% 1 13% 24% 30% 19%	490
	11th to 20th	Day	17% 4 10% 24% 29% 16%	490
	21st to end	Day	28% 3 17% 30% 17% 6%	490
October	1st to 10th	Day	18% 4 20% 23% 24% 11%	490
	11th to 20th	Day	13% 7% 25% 27% 23% 5%	490
	21st to end	Day	12% 9% 27% 32% 15% 6%	539
November	1st to 10th	Day	18% 7% 29% 27% 16% 4	495
	11th to 20th	Day	17% 12% 31% 25% 14% 1	439
	21st to end	Day	12% 16% 29% 26% 14% 2	257
December	1st to 10th	Day	23% 12% 40% 18% 6% 2	180
	11th to 20th	Day	18% 12% 38% 22% 8% 1	236
	21st to end	Day	22% 15% 33% 18% 11% 2	297
January	1st to 10th	Night	20% 13% 38% 23% 5%	760
	11th to 20th	Night	19% 13% 38% 26% 5%	760
	21st to end	Night	19% 12% 42% 24% 3	836
February	1st to 10th	Night	19% 13% 38% 26% 4	760
	11th to 20th	Night	25% 15% 39% 19% 1	743
	21st to end	Night	18% 14% 39% 25% 4	628
March	1st to 10th	Night	17% 15% 35% 29% 5%	760
	11th to 20th	Night	20% 14% 35% 24% 7%	760
	21st to end	Night	18% 11% 39% 27% 5%	836
April	1st to 10th	Night	16% 17% 33% 27% 7%	760
	11th to 20th	Night	15% 11% 33% 30% 11% 1	751
	21st to end	Night	14% 6% 34% 38% 8%	746
May	1st to 10th	Night	10% 10% 32% 37% 11%	570
	11th to 20th	Night	17% 4 24% 34% 19% 1	561
	21st to end	Night	14% 1 14% 39% 28% 4	617
June	1st to 10th	Night	11% 1 17% 42% 26% 2	570
	11th to 20th	Night	10% 2 15% 38% 30% 5%	570
	21st to end	Night	8% 2 15% 41% 32% 3	570
July	1st to 10th	Night	10% 1 8% 37% 40% 5%	555
	11th to 20th	Night	8% 2 6% 37% 41% 7%	552
	21st to end	Night	7% 2 9% 40% 36% 5%	624
August	1st to 10th	Night	14% 2 7% 41% 31% 5%	567
	11th to 20th	Night	12% 2 10% 34% 37% 5%	582
	21st to end	Night	11% 3 7% 35% 37% 8%	836
September	1st to 10th	Night	13% 2 8% 34% 36% 6%	760
	11th to 20th	Night	19% 3 9% 31% 33% 5%	760
	21st to end	Night	23% 4 16% 32% 23% 3	760
October	1st to 10th	Night	18% 4 16% 30% 25% 6%	760
	11th to 20th	Night	16% 6% 25% 31% 20% 2	760
	21st to end	Night	13% 8% 26% 34% 17% 2	836
November	1st to 10th	Night	16% 7% 25% 33% 16% 2	780
	11th to 20th	Night	15% 10% 30% 34% 10%	800
	21st to end	Night	14% 9% 32% 33% 11% 1	789
December	1st to 10th	Night	20% 11% 34% 28% 6%	760
	11th to 20th	Night	19% 8% 36% 31% 6%	760
	21st to end	Night	23% 11% 28% 33% 5%	836

Page generated at 2024-11-25 00:22:20. Version ac07

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