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 2024-11-05.

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% 10% 4 8% 5% 5% 5% 4 6% 7% 35%	101127
	Night	15% 10% 4 8% 5% 4 4 3 5% 7% 35%	97954
Transparency	Day	46% 6% 12% 21% 13% 1	104739
	Night	47% 5% 11% 21% 14% 2	102483
Seeing	Day	17% 10% 27% 24% 16% 6%	15703
	Night	19% 9% 29% 29% 13% 1	25535

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	15% 14% 10% 13% 6% 4 4 5% 6% 6% 18%	2527
	11th to 20th	Day	14% 16% 8% 14% 7% 6% 5% 7% 8% 5% 10%	2530
	21st to end	Day	27% 23% 6% 12% 4 3 3 2 3 4 14%	2793
February	1st to 10th	Day	15% 16% 5% 11% 7% 5% 6% 4 4 4 24%	1850
	11th to 20th	Day	15% 13% 4 12% 7% 6% 4 3 5% 5% 26%	1848
	21st to end	Day	16% 15% 6% 10% 4 4 4 3 5% 6% 26%	1570
March	1st to 10th	Day	19% 16% 5% 9% 5% 4 4 3 4 5% 27%	3120
	11th to 20th	Day	11% 10% 5% 8% 5% 4 5% 3 6% 8% 36%	3352
	21st to end	Day	19% 12% 5% 10% 6% 5% 5% 4 4 6% 25%	3994
April	1st to 10th	Day	16% 13% 4 8% 5% 4 4 4 4 6% 31%	2280
	11th to 20th	Day	17% 10% 3 5% 5% 5% 4 5% 5% 6% 35%	2258
	21st to end	Day	18% 9% 3 7% 4 5% 4 4 6% 7% 33%	2470
May	1st to 10th	Day	18% 8% 2 7% 4 4 5% 4 7% 9% 31%	4082
	11th to 20th	Day	15% 7% 2 6% 5% 4 5% 3 5% 8% 38%	4081
	21st to end	Day	10% 6% 2 6% 4 5% 5% 3 6% 9% 44%	4721
June	1st to 10th	Day	10% 6% 3 6% 5% 5% 6% 4 6% 7% 43%	2660
	11th to 20th	Day	9% 6% 2 5% 5% 5% 5% 4 7% 8% 45%	2660
	21st to end	Day	11% 5% 2 6% 5% 5% 6% 5% 6% 9% 40%	2660
July	1st to 10th	Day	13% 6% 3 7% 5% 5% 6% 4 6% 9% 37%	4440
	11th to 20th	Day	6% 5% 2 5% 4 4 5% 4 7% 11% 46%	4440
	21st to end	Day	7% 7% 3 8% 5% 6% 5% 4 6% 8% 41%	4784
August	1st to 10th	Day	8% 5% 2 6% 4 5% 5% 4 6% 9% 46%	4104
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 4 7% 8% 46%	3955
	21st to end	Day	6% 5% 2 5% 4 4 5% 4 6% 10% 48%	4180
September	1st to 10th	Day	10% 6% 2 6% 5% 4 4 4 5% 7% 47%	2256
	11th to 20th	Day	10% 5% 2 5% 4 4 5% 4 7% 8% 47%	2090
	21st to end	Day	13% 7% 2 6% 4 4 4 4 6% 7% 43%	2090
October	1st to 10th	Day	13% 7% 2 6% 4 4 4 3 5% 7% 45%	2090
	11th to 20th	Day	16% 8% 2 7% 4 4 4 4 6% 6% 38%	1893
	21st to end	Day	19% 11% 3 8% 5% 5% 4 4 5% 7% 28%	1881
November	1st to 10th	Day	11% 9% 3 6% 4 4 4 4 5% 7% 45%	1708
	11th to 20th	Day	17% 14% 3 9% 5% 3 4 3 4 7% 31%	1710
	21st to end	Day	20% 13% 4 9% 4 3 4 4 5% 5% 28%	1710
December	1st to 10th	Day	15% 16% 6% 12% 5% 5% 4 3 4 6% 24%	1639
	11th to 20th	Day	13% 17% 8% 12% 6% 4 4 2 4 6% 23%	1918
	21st to end	Day	23% 22% 8% 13% 6% 5% 3 3 3 4 11%	2783
January	1st to 10th	Night	17% 16% 7% 12% 6% 4 5% 4 5% 5% 20%	4428
	11th to 20th	Night	15% 20% 8% 15% 6% 4 5% 3 5% 4 15%	4440
	21st to end	Night	25% 17% 9% 11% 5% 4 3 3 3 4 17%	4871
February	1st to 10th	Night	19% 13% 5% 9% 6% 4 4 3 5% 5% 26%	2328
	11th to 20th	Night	13% 13% 4 7% 7% 5% 4 3 5% 6% 32%	2218
	21st to end	Night	21% 12% 3 9% 5% 5% 3 3 4 5% 29%	1884
March	1st to 10th	Night	16% 12% 4 8% 5% 4 4 3 4 7% 34%	3733
	11th to 20th	Night	11% 7% 3 7% 4 5% 4 4 5% 7% 43%	3593
	21st to end	Night	19% 10% 4 8% 4 4 4 3 5% 6% 32%	3667
April	1st to 10th	Night	15% 9% 2 6% 5% 5% 4 4 6% 7% 37%	1900
	11th to 20th	Night	20% 8% 3 5% 4 4 3 3 6% 6% 38%	1870
	21st to end	Night	18% 8% 3 7% 4 4 4 4 6% 6% 36%	1710
May	1st to 10th	Night	17% 8% 3 7% 6% 5% 5% 4 6% 8% 32%	2813
	11th to 20th	Night	19% 8% 2 6% 4 3 4 3 6% 8% 38%	2812
	21st to end	Night	12% 6% 2 6% 4 4 4 4 5% 8% 44%	2839
June	1st to 10th	Night	9% 5% 3 5% 4 5% 4 2 6% 9% 49%	1520
	11th to 20th	Night	8% 6% 3 6% 4 4 4 4 5% 9% 47%	1520
	21st to end	Night	10% 5% 2 6% 5% 4 5% 4 7% 10% 42%	1520
July	1st to 10th	Night	9% 5% 2 6% 5% 5% 4 4 7% 8% 45%	2530
	11th to 20th	Night	7% 4 2 5% 3 4 4 3 6% 10% 53%	2530
	21st to end	Night	7% 6% 2 7% 4 5% 5% 5% 8% 8% 43%	2775
August	1st to 10th	Night	10% 5% 2 6% 4 4 4 5% 7% 9% 44%	2825
	11th to 20th	Night	7% 5% 2 6% 4 5% 5% 4 7% 8% 49%	2871
	21st to end	Night	8% 5% 2 6% 3 4 4 4 6% 8% 51%	3476
September	1st to 10th	Night	11% 5% 2 5% 3 4 4 3 4 8% 52%	1905
	11th to 20th	Night	9% 4 2 4 2 3 3 3 5% 8% 56%	2090
	21st to end	Night	12% 8% 3 5% 3 4 4 3 5% 6% 47%	2090
October	1st to 10th	Night	12% 5% 2 6% 3 4 4 3 5% 6% 50%	2090
	11th to 20th	Night	16% 9% 3 6% 4 3 4 3 4 6% 42%	2280
	21st to end	Night	19% 9% 3 6% 4 4 4 4 5% 6% 37%	2717
November	1st to 10th	Night	12% 9% 3 7% 4 4 3 3 6% 6% 43%	2470
	11th to 20th	Night	14% 13% 3 9% 4 4 3 4 6% 7% 33%	2470
	21st to end	Night	18% 14% 4 8% 4 5% 4 3 5% 6% 28%	2470
December	1st to 10th	Night	16% 14% 6% 8% 6% 5% 4 3 6% 6% 25%	2536
	11th to 20th	Night	16% 16% 8% 11% 5% 5% 4 3 4 4 23%	3279
	21st to end	Night	26% 19% 7% 10% 5% 5% 4 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	53% 5% 11% 19% 11%	2280
	11th to 20th	Day	49% 6% 10% 21% 12% 3	2258
	21st to end	Day	49% 6% 12% 18% 12% 3	2470
May	1st to 10th	Day	49% 8% 12% 23% 8%	4120
	11th to 20th	Day	43% 7% 14% 25% 9% 1	4085
	21st to end	Day	34% 7% 13% 24% 21% 2	4734
June	1st to 10th	Day	38% 7% 11% 26% 16% 3	2660
	11th to 20th	Day	35% 6% 11% 26% 19% 3	2660
	21st to end	Day	41% 7% 15% 19% 16% 3	2660
July	1st to 10th	Day	42% 6% 13% 20% 16% 3	4371
	11th to 20th	Day	29% 7% 17% 28% 18% 1	4365
	21st to end	Day	39% 7% 14% 17% 20% 3	4633
August	1st to 10th	Day	34% 7% 15% 27% 15% 1	4091
	11th to 20th	Day	32% 8% 13% 28% 17% 1	3994
	21st to end	Day	30% 7% 14% 25% 20% 4	4179
September	1st to 10th	Day	36% 6% 14% 23% 18% 3	2256
	11th to 20th	Day	33% 6% 11% 26% 22% 2	2090
	21st to end	Day	40% 5% 10% 23% 19% 2	2090
October	1st to 10th	Day	28% 4 10% 33% 24% 1	3480
	11th to 20th	Day	37% 6% 9% 21% 26% 1	3122
	21st to end	Day	45% 5% 10% 26% 12% 2	3081
November	1st to 10th	Day	39% 6% 13% 24% 16% 1	1708
	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% 2	1870
	21st to end	Night	46% 5% 11% 21% 13% 3	1710
May	1st to 10th	Night	49% 7% 10% 22% 11% 1	2840
	11th to 20th	Night	43% 8% 12% 26% 11% 1	2813
	21st to end	Night	37% 6% 12% 20% 22% 3	2847
June	1st to 10th	Night	32% 6% 12% 28% 18% 4	1520
	11th to 20th	Night	35% 6% 12% 24% 20% 3	1520
	21st to end	Night	37% 7% 16% 21% 16% 4	1520
July	1st to 10th	Night	36% 6% 13% 25% 14% 6%	2490
	11th to 20th	Night	27% 6% 15% 26% 24% 2	2482
	21st to end	Night	35% 7% 16% 17% 22% 4	2687
August	1st to 10th	Night	34% 8% 14% 29% 14% 1	2814
	11th to 20th	Night	30% 7% 13% 30% 19% 1	2898
	21st to end	Night	31% 6% 11% 27% 22% 3	3476
September	1st to 10th	Night	32% 5% 12% 25% 20% 5%	1905
	11th to 20th	Night	27% 5% 8% 30% 27% 3	2090
	21st to end	Night	38% 6% 10% 23% 21% 2	2090
October	1st to 10th	Night	23% 4 8% 33% 30% 1	3480
	11th to 20th	Night	35% 4 8% 23% 29% 1	3790
	21st to end	Night	37% 4 10% 27% 21% 1	4467
November	1st to 10th	Night	41% 5% 10% 24% 18% 2	2470
	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	23% 13% 34% 21% 7% 2	460
	11th to 20th	Day	21% 17% 31% 19% 9% 3	452
	21st to end	Day	26% 14% 30% 20% 8% 2	460
May	1st to 10th	Day	23% 13% 30% 21% 10% 3	463
	11th to 20th	Day	22% 6% 28% 23% 17% 5%	487
	21st to end	Day	13% 5% 28% 27% 18% 9%	670
June	1st to 10th	Day	12% 8% 28% 27% 20% 6%	680
	11th to 20th	Day	10% 7% 30% 27% 21% 6%	680
	21st to end	Day	16% 6% 26% 29% 16% 7%	680
July	1st to 10th	Day	12% 3 18% 27% 23% 17%	671
	11th to 20th	Day	8% 3 24% 30% 23% 13%	668
	21st to end	Day	8% 4 20% 30% 28% 10%	722
August	1st to 10th	Day	8% 2 15% 27% 31% 17%	486
	11th to 20th	Day	11% 3 19% 29% 26% 12%	479
	21st to end	Day	9% 2 14% 29% 32% 14%	539
September	1st to 10th	Day	13% 4 18% 27% 26% 11%	490
	11th to 20th	Day	9% 5% 14% 26% 29% 17%	490
	21st to end	Day	16% 10% 21% 23% 23% 7%	490
October	1st to 10th	Day	13% 6% 28% 28% 18% 7%	490
	11th to 20th	Day	18% 18% 25% 28% 9% 2	395
	21st to end	Day	29% 12% 34% 21% 4 1	330
November	1st to 10th	Day	12% 15% 33% 26% 11% 4	282
	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% 12% 36% 26% 6% 1	570
	11th to 20th	Night	21% 9% 36% 26% 7% 1	563
	21st to end	Night	21% 11% 33% 25% 10% 1	570
May	1st to 10th	Night	21% 7% 34% 29% 9% 1	570
	11th to 20th	Night	21% 4 28% 32% 15% 1	561
	21st to end	Night	13% 4 23% 41% 18% 1	617
June	1st to 10th	Night	11% 4 23% 45% 16% 1	570
	11th to 20th	Night	10% 3 26% 41% 19% 1	570
	21st to end	Night	12% 2 24% 36% 23% 1	570
July	1st to 10th	Night	7% 1 15% 43% 28% 5%	555
	11th to 20th	Night	11% 3 15% 40% 28% 4	552
	21st to end	Night	6% 2 13% 44% 32% 2	624
August	1st to 10th	Night	8% 1 10% 44% 32% 5%	567
	11th to 20th	Night	9% 2 14% 41% 30% 4	564
	21st to end	Night	9% 2 14% 36% 35% 4	627
September	1st to 10th	Night	12% 3 16% 37% 28% 4	575
	11th to 20th	Night	10% 4 15% 35% 32% 4	760
	21st to end	Night	15% 6% 24% 32% 21% 3	760
October	1st to 10th	Night	13% 4 26% 35% 19% 3	760
	11th to 20th	Night	21% 12% 28% 28% 10%	760
	21st to end	Night	25% 11% 30% 26% 7%	836
November	1st to 10th	Night	17% 11% 34% 25% 11% 1	760
	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 2024-11-03 02:11:07. Version ac07

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