Potawatomi Wildlife Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Potawatomi Wildlife Park clear sky chart from 2005-11-06 to 2024-04-10.

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	14% 10% 4 7% 6% 3 5% 5% 5% 7% 33%	83007
	Night	16% 10% 4 7% 6% 3 4 4 5% 6% 34%	85816
Transparency	Day	50% 6% 12% 20% 11% 2	82710
	Night	50% 5% 11% 20% 12% 2	85634
Seeing	Day	17% 10% 27% 24% 16% 6%	14820
	Night	19% 9% 29% 29% 13% 1	24851

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	16% 13% 10% 11% 7% 3 4 6% 6% 6% 18%	2527
	11th to 20th	Day	14% 15% 8% 12% 8% 5% 6% 8% 7% 5% 11%	2530
	21st to end	Day	27% 22% 7% 11% 4 3 3 3 3 4 14%	2793
February	1st to 10th	Day	15% 14% 7% 9% 8% 4 5% 5% 4 5% 24%	1850
	11th to 20th	Day	15% 11% 5% 10% 8% 4 5% 4 5% 6% 26%	1848
	21st to end	Day	17% 14% 7% 9% 5% 3 4 4 5% 6% 26%	1570
March	1st to 10th	Day	19% 15% 6% 7% 6% 4 4 3 4 5% 27%	3120
	11th to 20th	Day	12% 9% 5% 7% 6% 3 5% 4 5% 8% 36%	3352
	21st to end	Day	19% 11% 6% 9% 7% 4 5% 5% 4 6% 25%	3994
April	1st to 10th	Day	16% 12% 5% 7% 6% 3 4 5% 4 6% 31%	2269
	11th to 20th	Day	18% 10% 3 4 5% 4 5% 5% 4 6% 35%	2137
	21st to end	Day	19% 9% 4 6% 5% 3 4 5% 5% 7% 33%	2340
May	1st to 10th	Day	17% 9% 3 8% 5% 3 6% 4 6% 9% 30%	2340
	11th to 20th	Day	19% 8% 3 6% 6% 3 5% 4 5% 7% 35%	2301
	21st to end	Day	12% 6% 3 6% 6% 4 5% 5% 6% 10% 39%	2664
June	1st to 10th	Day	11% 5% 3 5% 6% 4 5% 5% 6% 8% 44%	2520
	11th to 20th	Day	9% 6% 2 4 6% 3 6% 5% 7% 8% 44%	2520
	21st to end	Day	11% 5% 3 5% 6% 3 7% 6% 6% 9% 40%	2520
July	1st to 10th	Day	8% 5% 3 5% 5% 3 5% 5% 7% 9% 46%	2520
	11th to 20th	Day	8% 5% 2 4 5% 3 6% 6% 7% 10% 45%	2520
	21st to end	Day	7% 4 2 6% 5% 4 6% 6% 6% 10% 44%	2727
August	1st to 10th	Day	7% 4 2 5% 5% 4 6% 5% 6% 9% 45%	2327
	11th to 20th	Day	9% 4 2 6% 5% 4 6% 6% 7% 9% 42%	2256
	21st to end	Day	8% 4 2 5% 5% 3 5% 5% 7% 10% 46%	2376
September	1st to 10th	Day	11% 6% 2 5% 5% 3 5% 5% 5% 7% 45%	2138
	11th to 20th	Day	11% 5% 2 4 5% 3 5% 5% 7% 8% 46%	1980
	21st to end	Day	12% 6% 3 5% 5% 3 4 5% 6% 7% 45%	1980
October	1st to 10th	Day	13% 7% 2 5% 4 3 5% 4 6% 7% 43%	1980
	11th to 20th	Day	17% 8% 3 6% 5% 3 4 5% 6% 6% 37%	1794
	21st to end	Day	21% 11% 3 7% 7% 4 4 5% 5% 6% 28%	1782
November	1st to 10th	Day	11% 8% 3 5% 5% 3 4 4 4 7% 45%	1672
	11th to 20th	Day	17% 13% 4 8% 6% 2 3 4 4 7% 31%	1710
	21st to end	Day	20% 12% 5% 8% 5% 3 5% 4 5% 5% 28%	1710
December	1st to 10th	Day	15% 15% 6% 10% 7% 3 5% 4 4 6% 24%	1639
	11th to 20th	Day	13% 16% 9% 10% 7% 3 4 3 4 6% 23%	1918
	21st to end	Day	23% 21% 8% 12% 7% 3 3 4 3 4 11%	2783
January	1st to 10th	Night	18% 15% 7% 11% 7% 3 5% 5% 5% 5% 20%	4428
	11th to 20th	Night	15% 20% 8% 14% 8% 3 4 5% 5% 4 15%	4440
	21st to end	Night	26% 16% 9% 9% 6% 3 3 3 3 4 17%	4871
February	1st to 10th	Night	20% 12% 6% 9% 7% 3 4 4 5% 5% 26%	2328
	11th to 20th	Night	13% 12% 5% 6% 8% 4 4 4 5% 6% 33%	2218
	21st to end	Night	21% 11% 4 8% 6% 3 4 3 4 5% 30%	1884
March	1st to 10th	Night	17% 11% 4 7% 6% 3 4 4 4 7% 34%	3733
	11th to 20th	Night	11% 7% 3 6% 5% 3 4 5% 6% 7% 43%	3593
	21st to end	Night	19% 9% 4 7% 5% 3 4 4 5% 6% 32%	3667
April	1st to 10th	Night	15% 8% 3 5% 6% 3 5% 5% 6% 7% 36%	1900
	11th to 20th	Night	20% 7% 3 5% 5% 4 4 4 6% 6% 38%	1771
	21st to end	Night	19% 7% 4 6% 5% 3 4 5% 5% 7% 36%	1620
May	1st to 10th	Night	18% 8% 3 6% 7% 3 5% 5% 6% 7% 32%	1620
	11th to 20th	Night	19% 8% 2 5% 5% 3 4 4 6% 7% 37%	1592
	21st to end	Night	10% 5% 2 5% 5% 3 5% 6% 7% 9% 42%	1608
June	1st to 10th	Night	9% 4 3 4 5% 4 4 4 5% 9% 50%	1440
	11th to 20th	Night	9% 5% 3 6% 5% 3 5% 4 5% 8% 48%	1440
	21st to end	Night	10% 5% 2 5% 6% 3 4 6% 7% 10% 43%	1440
July	1st to 10th	Night	5% 5% 3 4 6% 3 4 4 7% 8% 50%	1440
	11th to 20th	Night	9% 4 2 4 3 2 5% 4 6% 10% 51%	1440
	21st to end	Night	5% 5% 2 4 4 3 5% 6% 7% 9% 50%	1588
August	1st to 10th	Night	7% 3 2 5% 4 3 5% 5% 7% 10% 50%	1611
	11th to 20th	Night	7% 4 2 5% 4 4 4 5% 7% 8% 50%	1642
	21st to end	Night	8% 4 2 4 4 3 4 5% 6% 8% 52%	1980
September	1st to 10th	Night	12% 5% 2 4 4 3 4 4 4 8% 50%	1804
	11th to 20th	Night	9% 4 2 4 3 3 3 4 5% 8% 55%	1980
	21st to end	Night	12% 7% 2 5% 4 3 4 4 5% 6% 49%	1980
October	1st to 10th	Night	12% 5% 2 6% 4 3 4 4 4 6% 49%	1980
	11th to 20th	Night	17% 9% 3 5% 5% 3 3 4 4 6% 41%	2159
	21st to end	Night	21% 9% 3 5% 5% 3 4 4 4 6% 36%	2574
November	1st to 10th	Night	13% 8% 3 6% 5% 2 4 4 6% 6% 43%	2406
	11th to 20th	Night	15% 12% 3 7% 6% 3 3 5% 5% 7% 34%	2470
	21st to end	Night	18% 12% 5% 7% 5% 4 4 4 5% 6% 28%	2470
December	1st to 10th	Night	17% 13% 6% 7% 6% 5% 5% 4 5% 6% 26%	2536
	11th to 20th	Night	16% 15% 9% 10% 6% 4 4 4 4 5% 23%	3279
	21st to end	Night	26% 19% 7% 9% 6% 4 5% 3 4 5% 13%	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	65% 6% 11% 13% 5%	2528
	11th to 20th	Day	70% 5% 10% 9% 6%	2530
	21st to end	Day	76% 3 7% 11% 3	2793
February	1st to 10th	Day	64% 4 9% 13% 8% 1	1850
	11th to 20th	Day	59% 5% 10% 18% 8% 1	1858
	21st to end	Day	59% 4 12% 17% 6% 1	1570
March	1st to 10th	Day	61% 5% 8% 18% 8%	3120
	11th to 20th	Day	45% 5% 13% 27% 8% 1	3352
	21st to end	Day	59% 7% 14% 17% 3	3994
April	1st to 10th	Day	54% 5% 11% 20% 11%	2269
	11th to 20th	Day	49% 6% 9% 21% 12% 3	2137
	21st to end	Day	50% 6% 12% 17% 12% 3	2340
May	1st to 10th	Day	51% 6% 12% 22% 8% 1	2340
	11th to 20th	Day	50% 6% 10% 20% 13% 1	2305
	21st to end	Day	41% 6% 12% 23% 15% 2	2664
June	1st to 10th	Day	38% 7% 11% 26% 16% 2	2520
	11th to 20th	Day	36% 6% 11% 25% 19% 3	2520
	21st to end	Day	41% 7% 15% 19% 16% 2	2520
July	1st to 10th	Day	34% 8% 13% 24% 18% 4	2451
	11th to 20th	Day	33% 8% 15% 25% 17% 2	2445
	21st to end	Day	35% 8% 14% 25% 17% 3	2575
August	1st to 10th	Day	35% 7% 15% 28% 13% 2	2314
	11th to 20th	Day	35% 9% 15% 24% 15% 2	2256
	21st to end	Day	32% 8% 13% 23% 19% 6%	2376
September	1st to 10th	Day	38% 6% 15% 21% 17% 3	2138
	11th to 20th	Day	35% 6% 11% 26% 20% 2	1980
	21st to end	Day	38% 5% 11% 24% 20% 2	1980
October	1st to 10th	Day	40% 5% 12% 23% 18% 2	1980
	11th to 20th	Day	46% 6% 10% 21% 16% 1	1794
	21st to end	Day	56% 6% 10% 18% 9% 1	1782
November	1st to 10th	Day	39% 6% 13% 24% 16% 1	1672
	11th to 20th	Day	55% 4 11% 19% 11% 1	1710
	21st to end	Day	57% 4 14% 18% 7% 1	1710
December	1st to 10th	Day	62% 5% 11% 15% 7%	1639
	11th to 20th	Day	64% 4 10% 19% 3	1915
	21st to end	Day	79% 3 7% 6% 4	2783
January	1st to 10th	Night	64% 6% 11% 13% 6%	4428
	11th to 20th	Night	73% 3 9% 11% 4	4440
	21st to end	Night	72% 3 9% 12% 4	4871
February	1st to 10th	Night	60% 5% 11% 14% 8% 2	2328
	11th to 20th	Night	53% 5% 10% 20% 11% 1	2219
	21st to end	Night	57% 4 11% 15% 10% 2	1884
March	1st to 10th	Night	51% 5% 12% 24% 8% 1	3733
	11th to 20th	Night	39% 6% 12% 26% 15% 2	3593
	21st to end	Night	52% 6% 13% 22% 7% 1	3667
April	1st to 10th	Night	45% 7% 12% 21% 14% 1	1900
	11th to 20th	Night	46% 5% 10% 20% 17% 3	1771
	21st to end	Night	46% 5% 11% 21% 13% 3	1620
May	1st to 10th	Night	51% 7% 9% 20% 11% 1	1620
	11th to 20th	Night	46% 7% 11% 20% 15% 2	1593
	21st to end	Night	39% 8% 14% 21% 16% 3	1609
June	1st to 10th	Night	31% 6% 12% 28% 19% 4	1440
	11th to 20th	Night	35% 6% 12% 24% 20% 3	1440
	21st to end	Night	37% 7% 16% 22% 15% 3	1440
July	1st to 10th	Night	33% 5% 14% 25% 18% 5%	1400
	11th to 20th	Night	30% 6% 14% 26% 21% 3	1392
	21st to end	Night	28% 7% 16% 24% 20% 5%	1500
August	1st to 10th	Night	28% 8% 13% 30% 20% 2	1600
	11th to 20th	Night	30% 7% 14% 26% 20% 2	1642
	21st to end	Night	29% 7% 12% 24% 23% 5%	1980
September	1st to 10th	Night	34% 5% 13% 24% 18% 6%	1804
	11th to 20th	Night	28% 5% 9% 30% 26% 2	1980
	21st to end	Night	36% 6% 10% 24% 22% 3	1980
October	1st to 10th	Night	36% 5% 9% 27% 21% 1	1980
	11th to 20th	Night	44% 4 8% 23% 18% 2	2159
	21st to end	Night	49% 4 11% 21% 13% 1	2574
November	1st to 10th	Night	41% 5% 11% 23% 18% 2	2406
	11th to 20th	Night	50% 4 11% 20% 12% 2	2470
	21st to end	Night	56% 5% 12% 20% 8%	2470
December	1st to 10th	Night	58% 6% 11% 16% 8%	2536
	11th to 20th	Night	63% 4 12% 14% 6% 1	3281
	21st to end	Night	74% 5% 10% 8% 4	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	21% 16% 36% 20% 6% 1	270
	11th to 20th	Day	23% 14% 41% 17% 3 1	270
	21st to end	Day	31% 14% 30% 21% 4	297
February	1st to 10th	Day	23% 17% 37% 18% 4 1	270
	11th to 20th	Day	27% 17% 34% 17% 5%	270
	21st to end	Day	25% 20% 41% 9% 5%	225
March	1st to 10th	Day	20% 21% 37% 20% 2	270
	11th to 20th	Day	23% 14% 32% 23% 7% 1	384
	21st to end	Day	30% 16% 27% 20% 6% 1	506
April	1st to 10th	Day	24% 12% 34% 21% 7% 2	457
	11th to 20th	Day	21% 16% 30% 19% 10% 4	412
	21st to end	Day	27% 14% 30% 19% 9% 2	420
May	1st to 10th	Day	24% 13% 30% 21% 10% 3	423
	11th to 20th	Day	23% 6% 28% 23% 16% 4	447
	21st to end	Day	14% 4 28% 26% 18% 10%	618
June	1st to 10th	Day	12% 7% 28% 27% 20% 6%	630
	11th to 20th	Day	10% 6% 29% 27% 21% 7%	630
	21st to end	Day	16% 6% 24% 30% 17% 7%	630
July	1st to 10th	Day	11% 3 17% 27% 24% 18%	621
	11th to 20th	Day	8% 3 23% 30% 23% 13%	618
	21st to end	Day	9% 4 20% 29% 28% 10%	668
August	1st to 10th	Day	7% 2 13% 27% 33% 18%	446
	11th to 20th	Day	10% 3 18% 28% 27% 13%	439
	21st to end	Day	9% 3 15% 28% 31% 15%	495
September	1st to 10th	Day	14% 4 18% 27% 26% 11%	450
	11th to 20th	Day	10% 5% 15% 25% 29% 16%	450
	21st to end	Day	14% 9% 21% 24% 24% 8%	450
October	1st to 10th	Day	14% 5% 29% 27% 17% 8%	450
	11th to 20th	Day	20% 19% 25% 28% 8%	360
	21st to end	Day	32% 11% 33% 20% 3 1	297
November	1st to 10th	Day	11% 15% 34% 25% 11% 4	270
	11th to 20th	Day	24% 16% 31% 19% 10%	270
	21st to end	Day	30% 11% 35% 19% 6%	270
December	1st to 10th	Day	19% 18% 38% 16% 9%	270
	11th to 20th	Day	19% 17% 41% 16% 6% 1	270
	21st to end	Day	26% 20% 37% 16% 1	297
January	1st to 10th	Night	23% 15% 35% 21% 5%	950
	11th to 20th	Night	25% 13% 37% 21% 3 1	950
	21st to end	Night	22% 13% 35% 25% 4	1032
February	1st to 10th	Night	27% 9% 36% 25% 4	760
	11th to 20th	Night	21% 13% 38% 24% 3	743
	21st to end	Night	28% 13% 36% 18% 4	628
March	1st to 10th	Night	20% 12% 36% 26% 6% 1	760
	11th to 20th	Night	18% 12% 37% 27% 5% 1	760
	21st to end	Night	26% 9% 31% 28% 6%	750
April	1st to 10th	Night	18% 13% 36% 26% 6% 1	570
	11th to 20th	Night	21% 9% 35% 27% 7% 1	533
	21st to end	Night	22% 9% 32% 26% 10% 1	540
May	1st to 10th	Night	21% 7% 33% 29% 10% 1	540
	11th to 20th	Night	21% 4 28% 32% 14% 1	531
	21st to end	Night	13% 3 23% 41% 19% 1	584
June	1st to 10th	Night	11% 3 22% 46% 17% 1	540
	11th to 20th	Night	11% 3 25% 41% 19% 1	540
	21st to end	Night	12% 2 24% 36% 24% 1	540
July	1st to 10th	Night	7% 1 15% 42% 29% 6%	525
	11th to 20th	Night	11% 2 15% 40% 28% 4	522
	21st to end	Night	6% 2 13% 43% 33% 2	591
August	1st to 10th	Night	8% 10% 44% 32% 5%	537
	11th to 20th	Night	9% 2 13% 41% 30% 5%	534
	21st to end	Night	9% 2 15% 35% 35% 4	594
September	1st to 10th	Night	13% 3 16% 36% 28% 4	544
	11th to 20th	Night	11% 4 15% 34% 31% 5%	720
	21st to end	Night	14% 5% 24% 32% 22% 3	720
October	1st to 10th	Night	14% 5% 26% 33% 20% 3	720
	11th to 20th	Night	22% 12% 29% 28% 9%	720
	21st to end	Night	27% 11% 30% 25% 7%	792
November	1st to 10th	Night	17% 11% 34% 25% 11% 1	740
	11th to 20th	Night	22% 15% 33% 24% 5% 1	760
	21st to end	Night	26% 12% 32% 24% 6%	760
December	1st to 10th	Night	25% 15% 35% 21% 4	826
	11th to 20th	Night	24% 12% 36% 23% 5%	950
	21st to end	Night	31% 13% 32% 20% 3	1045

Page generated at 2024-04-07 09:28:14. Version ac07

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