Novi Community Sports Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Novi Community Sports Park clear sky chart from 2005-11-06 to 2026-10-14.

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% 9% 3 8% 5% 5% 5% 4 6% 7% 34%	148311
	Night	14% 10% 4 8% 5% 5% 4 4 5% 7% 35%	143552
Transparency	Day	47% 6% 12% 21% 13% 1	151881
	Night	48% 5% 12% 21% 13% 1	148055
Seeing	Day	18% 13% 30% 22% 13% 5%	18098
	Night	19% 11% 29% 29% 11% 1	28097

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	13% 16% 7% 16% 7% 5% 4 3 4 5% 21%	4691
	11th to 20th	Day	13% 15% 7% 17% 10% 10% 6% 3 4 4 11%	4710
	21st to end	Day	17% 16% 5% 12% 9% 5% 7% 3 5% 5% 15%	5665
February	1st to 10th	Day	14% 14% 6% 13% 8% 6% 5% 4 4 5% 22%	1890
	11th to 20th	Day	14% 12% 6% 12% 9% 6% 5% 3 4 5% 24%	1999
	21st to end	Day	15% 15% 4 11% 6% 5% 4 4 5% 6% 26%	1730
March	1st to 10th	Day	15% 12% 5% 11% 6% 4 4 3 4 5% 31%	4671
	11th to 20th	Day	12% 11% 4 8% 5% 5% 4 4 5% 8% 34%	5090
	21st to end	Day	18% 13% 4 9% 6% 5% 4 3 5% 5% 28%	5586
April	1st to 10th	Day	16% 13% 4 8% 4 5% 5% 4 5% 7% 30%	2452
	11th to 20th	Day	16% 10% 3 8% 5% 5% 4 3 6% 6% 35%	2655
	21st to end	Day	17% 9% 3 8% 5% 4 5% 3 5% 7% 34%	2730
May	1st to 10th	Day	16% 9% 3 8% 5% 6% 5% 4 6% 6% 34%	7616
	11th to 20th	Day	14% 7% 3 8% 5% 5% 5% 4 7% 8% 33%	7626
	21st to end	Day	14% 5% 2 6% 4 4 4 3 5% 7% 44%	8391
June	1st to 10th	Day	9% 6% 2 7% 5% 5% 5% 5% 6% 9% 41%	2935
	11th to 20th	Day	10% 6% 2 6% 6% 5% 6% 5% 7% 9% 39%	2940
	21st to end	Day	9% 6% 3 6% 5% 5% 6% 5% 9% 9% 37%	2940
July	1st to 10th	Day	9% 5% 2 7% 5% 5% 5% 5% 7% 10% 40%	8280
	11th to 20th	Day	5% 4 2 5% 4 5% 5% 4 7% 12% 48%	8280
	21st to end	Day	7% 6% 2 6% 4 5% 5% 4 7% 10% 45%	8499
August	1st to 10th	Day	13% 6% 2 6% 4 5% 5% 4 5% 7% 42%	6014
	11th to 20th	Day	9% 7% 3 7% 5% 6% 6% 5% 8% 9% 35%	5951
	21st to end	Day	6% 5% 2 7% 6% 6% 6% 6% 8% 10% 39%	6500
September	1st to 10th	Day	10% 7% 2 6% 4 5% 6% 4 6% 9% 40%	2379
	11th to 20th	Day	9% 5% 2 6% 4 4 5% 4 7% 9% 46%	2310
	21st to end	Day	14% 7% 2 7% 5% 5% 5% 3 6% 7% 38%	2310
October	1st to 10th	Day	13% 6% 2 6% 5% 4 4 4 6% 7% 44%	2260
	11th to 20th	Day	18% 8% 3 7% 5% 5% 5% 3 5% 7% 33%	2030
	21st to end	Day	19% 10% 3 8% 4 5% 4 4 5% 6% 32%	2030
November	1st to 10th	Day	12% 10% 3 8% 5% 5% 4 4 5% 6% 39%	1852
	11th to 20th	Day	16% 13% 3 9% 6% 5% 5% 3 5% 6% 30%	1890
	21st to end	Day	17% 15% 5% 9% 5% 4 4 4 4 6% 27%	1819
December	1st to 10th	Day	13% 14% 6% 14% 7% 6% 6% 4 5% 6% 20%	2680
	11th to 20th	Day	19% 20% 6% 9% 6% 5% 4 3 5% 5% 18%	2840
	21st to end	Day	27% 20% 7% 12% 4 4 3 3 3 4 13%	4070
January	1st to 10th	Night	14% 15% 6% 13% 6% 5% 5% 3 5% 5% 24%	8232
	11th to 20th	Night	9% 16% 7% 14% 8% 8% 6% 4 6% 6% 16%	8280
	21st to end	Night	14% 14% 7% 12% 5% 5% 5% 4 5% 5% 22%	8506
February	1st to 10th	Night	15% 14% 4 11% 8% 5% 4 3 5% 5% 25%	2730
	11th to 20th	Night	14% 13% 5% 10% 6% 4 5% 4 5% 6% 27%	2505
	21st to end	Night	18% 12% 5% 9% 5% 4 4 3 5% 6% 28%	2076
March	1st to 10th	Night	15% 11% 4 8% 5% 4 4 3 5% 7% 35%	5400
	11th to 20th	Night	10% 7% 3 7% 4 4 5% 4 6% 8% 42%	5090
	21st to end	Night	17% 9% 3 8% 5% 4 4 3 4 5% 36%	5588
April	1st to 10th	Night	16% 11% 3 7% 6% 4 4 3 6% 6% 35%	2186
	11th to 20th	Night	17% 8% 3 5% 5% 4 4 4 6% 7% 37%	1913
	21st to end	Night	16% 9% 2 6% 4 4 5% 4 4 6% 39%	1890
May	1st to 10th	Night	17% 9% 4 8% 4 4 4 3 5% 8% 33%	5237
	11th to 20th	Night	15% 7% 3 6% 4 5% 4 3 4 7% 41%	5234
	21st to end	Night	13% 6% 2 6% 4 4 4 3 6% 8% 45%	5761
June	1st to 10th	Night	11% 5% 2 6% 3 4 5% 3 6% 9% 48%	1680
	11th to 20th	Night	10% 6% 2 6% 4 4 4 4 7% 10% 43%	1680
	21st to end	Night	9% 6% 2 4 4 3 4 3 6% 9% 49%	1680
July	1st to 10th	Night	7% 5% 2 6% 4 4 5% 4 7% 9% 46%	4708
	11th to 20th	Night	6% 5% 2 5% 4 4 4 4 7% 9% 52%	4707
	21st to end	Night	7% 5% 2 7% 4 5% 4 3 5% 8% 49%	5569
August	1st to 10th	Night	15% 7% 2 6% 4 4 4 2 5% 8% 45%	4135
	11th to 20th	Night	10% 7% 3 8% 4 5% 4 4 6% 8% 42%	4095
	21st to end	Night	7% 5% 2 7% 5% 5% 5% 4 6% 8% 47%	4621
September	1st to 10th	Night	10% 5% 2 6% 4 4 4 3 5% 7% 49%	2219
	11th to 20th	Night	10% 5% 2 4 2 4 4 3 5% 7% 55%	2310
	21st to end	Night	13% 7% 3 6% 4 3 5% 3 5% 7% 44%	2310
October	1st to 10th	Night	13% 7% 3 6% 3 3 4 3 5% 6% 48%	2359
	11th to 20th	Night	17% 9% 3 6% 5% 4 5% 3 5% 5% 37%	2437
	21st to end	Night	20% 8% 3 7% 4 5% 4 4 5% 6% 35%	2807
November	1st to 10th	Night	12% 8% 3 6% 4 4 4 3 5% 6% 43%	2666
	11th to 20th	Night	15% 11% 4 7% 5% 5% 5% 4 6% 6% 31%	2730
	21st to end	Night	19% 13% 5% 8% 5% 5% 4 3 5% 5% 27%	2795
December	1st to 10th	Night	12% 13% 4 13% 7% 6% 5% 4 6% 6% 23%	4720
	11th to 20th	Night	16% 19% 6% 13% 6% 4 4 3 4 5% 19%	5546
	21st to end	Night	26% 22% 7% 9% 5% 3 3 3 3 4 14%	7150

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% 5% 11% 14% 5% 1	4692
	11th to 20th	Day	75% 4 8% 7% 5%	4710
	21st to end	Day	71% 4 9% 10% 5%	5665
February	1st to 10th	Day	63% 6% 9% 14% 7%	1890
	11th to 20th	Day	61% 5% 10% 15% 7% 1	2009
	21st to end	Day	58% 6% 12% 15% 7% 1	1730
March	1st to 10th	Day	56% 5% 12% 17% 9% 1	4671
	11th to 20th	Day	47% 6% 16% 22% 8% 2	5090
	21st to end	Day	57% 6% 10% 15% 11% 1	5586
April	1st to 10th	Day	52% 6% 11% 18% 12%	2452
	11th to 20th	Day	49% 6% 11% 20% 12% 2	2655
	21st to end	Day	48% 6% 13% 19% 13% 1	2730
May	1st to 10th	Day	48% 6% 11% 22% 11% 2	7651
	11th to 20th	Day	46% 7% 13% 21% 13% 1	7630
	21st to end	Day	39% 5% 10% 20% 23% 4	8405
June	1st to 10th	Day	37% 8% 12% 26% 14% 3	2935
	11th to 20th	Day	39% 7% 14% 22% 16% 2	2940
	21st to end	Day	38% 9% 14% 22% 15% 2	2940
July	1st to 10th	Day	37% 5% 14% 26% 16% 1	8211
	11th to 20th	Day	28% 5% 14% 32% 20% 1	8205
	21st to end	Day	33% 5% 13% 24% 22% 1	8313
August	1st to 10th	Day	40% 5% 12% 22% 18% 1	6001
	11th to 20th	Day	42% 6% 15% 28% 8% 1	5990
	21st to end	Day	37% 6% 18% 28% 10% 1	6499
September	1st to 10th	Day	39% 8% 16% 23% 14% 2	2379
	11th to 20th	Day	32% 7% 14% 31% 15% 1	2310
	21st to end	Day	43% 7% 12% 23% 14% 1	2310
October	1st to 10th	Day	30% 5% 11% 32% 20% 1	3611
	11th to 20th	Day	39% 5% 12% 26% 18%	3270
	21st to end	Day	44% 5% 13% 23% 13% 1	3254
November	1st to 10th	Day	46% 6% 11% 23% 12% 1	1852
	11th to 20th	Day	54% 5% 13% 19% 8% 2	1890
	21st to end	Day	58% 7% 11% 18% 6%	1819
December	1st to 10th	Day	63% 6% 15% 11% 4	2680
	11th to 20th	Day	68% 5% 10% 12% 5%	2836
	21st to end	Day	76% 4 8% 7% 5%	4070
January	1st to 10th	Night	61% 5% 10% 16% 7% 1	8233
	11th to 20th	Night	66% 5% 11% 11% 6%	8280
	21st to end	Night	63% 4 10% 16% 7%	8506
February	1st to 10th	Night	60% 7% 10% 16% 7% 1	2730
	11th to 20th	Night	57% 5% 11% 17% 9% 1	2506
	21st to end	Night	56% 5% 14% 17% 8% 1	2076
March	1st to 10th	Night	48% 5% 14% 22% 10% 1	5400
	11th to 20th	Night	38% 6% 14% 26% 15% 1	5090
	21st to end	Night	49% 5% 11% 20% 14% 1	5588
April	1st to 10th	Night	48% 6% 10% 20% 13% 2	2186
	11th to 20th	Night	44% 7% 12% 18% 18% 1	1913
	21st to end	Night	45% 6% 12% 19% 16% 3	1890
May	1st to 10th	Night	49% 6% 11% 17% 14% 3	5264
	11th to 20th	Night	43% 5% 11% 26% 13% 2	5235
	21st to end	Night	37% 5% 12% 22% 20% 5%	5771
June	1st to 10th	Night	34% 6% 11% 26% 20% 3	1680
	11th to 20th	Night	36% 8% 13% 25% 17% 2	1680
	21st to end	Night	32% 6% 14% 26% 20% 1	1680
July	1st to 10th	Night	33% 5% 13% 30% 15% 3	4670
	11th to 20th	Night	28% 5% 13% 31% 22% 1	4662
	21st to end	Night	33% 5% 13% 22% 26% 2	5442
August	1st to 10th	Night	39% 5% 11% 22% 21% 2	4124
	11th to 20th	Night	39% 6% 16% 30% 8% 1	4122
	21st to end	Night	35% 5% 16% 31% 12% 1	4621
September	1st to 10th	Night	33% 7% 13% 28% 17% 2	2219
	11th to 20th	Night	28% 6% 11% 31% 21% 2	2310
	21st to end	Night	39% 6% 12% 27% 15% 1	2310
October	1st to 10th	Night	26% 4 9% 33% 27% 1	3788
	11th to 20th	Night	42% 4 11% 23% 19%	3936
	21st to end	Night	39% 5% 11% 31% 14% 1	4533
November	1st to 10th	Night	41% 6% 12% 26% 15% 1	2666
	11th to 20th	Night	50% 6% 14% 20% 9% 1	2730
	21st to end	Night	57% 6% 12% 17% 7%	2795
December	1st to 10th	Night	59% 6% 16% 15% 4	4720
	11th to 20th	Night	65% 5% 11% 13% 5% 1	5549
	21st to end	Night	74% 5% 9% 7% 6%	7150

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	22% 21% 38% 14% 4 1	330
	11th to 20th	Day	25% 19% 43% 11% 1 1	330
	21st to end	Day	27% 19% 35% 15% 4 1	363
February	1st to 10th	Day	25% 21% 36% 14% 2 1	330
	11th to 20th	Day	25% 22% 38% 14% 2	330
	21st to end	Day	25% 30% 35% 10% 1	273
March	1st to 10th	Day	27% 22% 34% 14% 3	369
	11th to 20th	Day	26% 16% 33% 20% 6% 1	540
	21st to end	Day	25% 18% 34% 18% 5% 1	594
April	1st to 10th	Day	23% 18% 33% 18% 7% 1	540
	11th to 20th	Day	26% 19% 31% 14% 6% 4	532
	21st to end	Day	24% 15% 30% 18% 10% 2	540
May	1st to 10th	Day	24% 15% 28% 20% 10% 3	543
	11th to 20th	Day	21% 11% 30% 22% 11% 6%	567
	21st to end	Day	14% 9% 25% 27% 17% 7%	617
June	1st to 10th	Day	11% 9% 31% 31% 13% 3	775
	11th to 20th	Day	14% 9% 33% 27% 13% 3	780
	21st to end	Day	12% 9% 30% 32% 13% 4	780
July	1st to 10th	Day	10% 5% 25% 28% 22% 9%	771
	11th to 20th	Day	10% 7% 29% 29% 18% 7%	768
	21st to end	Day	8% 5% 27% 28% 23% 8%	677
August	1st to 10th	Day	8% 4 22% 28% 25% 12%	566
	11th to 20th	Day	13% 5% 22% 29% 21% 10%	559
	21st to end	Day	10% 5% 22% 28% 23% 11%	627
September	1st to 10th	Day	13% 7% 24% 24% 22% 10%	570
	11th to 20th	Day	11% 5% 18% 25% 27% 15%	570
	21st to end	Day	17% 10% 25% 22% 18% 8%	570
October	1st to 10th	Day	15% 11% 27% 23% 17% 7%	570
	11th to 20th	Day	20% 15% 31% 25% 8% 1	542
	21st to end	Day	27% 18% 34% 16% 6%	413
November	1st to 10th	Day	16% 20% 36% 19% 8% 1	330
	11th to 20th	Day	25% 22% 31% 16% 5% 1	330
	21st to end	Day	30% 20% 33% 13% 5%	291
December	1st to 10th	Day	21% 22% 36% 14% 7%	220
	11th to 20th	Day	31% 20% 35% 10% 4	228
	21st to end	Day	30% 24% 31% 13% 2	363
January	1st to 10th	Night	23% 15% 36% 21% 5% 1	1050
	11th to 20th	Night	26% 16% 33% 21% 4 1	1050
	21st to end	Night	20% 16% 34% 25% 5%	964
February	1st to 10th	Night	24% 13% 35% 25% 3	840
	11th to 20th	Night	23% 15% 33% 25% 3	823
	21st to end	Night	26% 15% 39% 19% 2	692
March	1st to 10th	Night	22% 14% 33% 26% 6%	840
	11th to 20th	Night	19% 18% 35% 23% 5% 1	840
	21st to end	Night	23% 13% 31% 26% 7% 1	924
April	1st to 10th	Night	21% 16% 34% 25% 4 1	716
	11th to 20th	Night	22% 11% 34% 25% 7% 1	623
	21st to end	Night	21% 9% 31% 32% 7%	630
May	1st to 10th	Night	19% 11% 32% 30% 8% 1	630
	11th to 20th	Night	21% 8% 27% 31% 12% 1	621
	21st to end	Night	12% 5% 26% 38% 18% 2	683
June	1st to 10th	Night	12% 5% 24% 45% 13% 1	630
	11th to 20th	Night	12% 5% 25% 42% 16%	630
	21st to end	Night	10% 4 24% 42% 19% 1	630
July	1st to 10th	Night	8% 2 19% 41% 26% 4	615
	11th to 20th	Night	9% 4 20% 38% 24% 4	612
	21st to end	Night	6% 2 19% 48% 22% 2	690
August	1st to 10th	Night	9% 3 18% 41% 27% 3	627
	11th to 20th	Night	9% 4 19% 36% 29% 3	624
	21st to end	Night	9% 3 18% 36% 31% 3	693
September	1st to 10th	Night	13% 5% 19% 34% 24% 4	749
	11th to 20th	Night	11% 5% 17% 33% 30% 5%	840
	21st to end	Night	15% 7% 22% 31% 21% 4	840
October	1st to 10th	Night	16% 6% 27% 31% 18% 3	840
	11th to 20th	Night	22% 13% 29% 26% 8% 2	813
	21st to end	Night	23% 12% 34% 26% 5%	880
November	1st to 10th	Night	18% 13% 31% 27% 11% 1	820
	11th to 20th	Night	23% 16% 32% 22% 6% 1	840
	21st to end	Night	27% 15% 33% 20% 5%	840
December	1st to 10th	Night	24% 17% 34% 20% 6%	840
	11th to 20th	Night	25% 15% 37% 20% 3	963
	21st to end	Night	32% 13% 34% 19% 2	1155

Page generated at 2026-10-11 05:06:29. Version ac07

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