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 2024-11-02.

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% 3 8% 5% 5% 5% 4 6% 7% 33%	100727
	Night	15% 10% 4 8% 5% 4 4 4 5% 7% 35%	98215
Transparency	Day	48% 7% 13% 20% 11% 1	100526
	Night	48% 6% 12% 20% 12% 1	98087
Seeing	Day	17% 12% 29% 23% 13% 5%	15458
	Night	19% 10% 29% 29% 12% 1	25482

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% 18% 6% 11% 6% 4 5% 4 5% 5% 21%	2527
	11th to 20th	Day	16% 17% 6% 12% 8% 7% 7% 4 5% 5% 12%	2530
	21st to end	Day	26% 22% 6% 10% 5% 3 4 3 3 5% 13%	3061
February	1st to 10th	Day	14% 14% 5% 13% 8% 6% 5% 4 4 5% 22%	1710
	11th to 20th	Day	14% 12% 5% 12% 9% 5% 5% 3 5% 5% 24%	1803
	21st to end	Day	15% 16% 4 10% 6% 5% 4 4 4 6% 26%	1570
March	1st to 10th	Day	17% 16% 5% 9% 6% 4 4 3 4 5% 27%	3181
	11th to 20th	Day	13% 12% 4 9% 6% 5% 4 3 5% 7% 32%	3480
	21st to end	Day	19% 12% 4 9% 6% 5% 4 3 5% 5% 27%	3815
April	1st to 10th	Day	16% 13% 4 7% 4 5% 5% 4 5% 7% 31%	2218
	11th to 20th	Day	17% 10% 3 7% 5% 5% 4 3 6% 6% 35%	2399
	21st to end	Day	18% 10% 3 8% 4 4 5% 3 5% 7% 34%	2470
May	1st to 10th	Day	17% 9% 3 6% 5% 5% 5% 3 5% 7% 35%	4082
	11th to 20th	Day	16% 7% 3 7% 5% 5% 5% 4 7% 8% 34%	4081
	21st to end	Day	10% 6% 2 7% 5% 5% 4 3 6% 8% 45%	4476
June	1st to 10th	Day	10% 6% 2 7% 6% 5% 5% 5% 6% 9% 40%	2655
	11th to 20th	Day	10% 6% 2 6% 6% 5% 6% 4 6% 9% 40%	2660
	21st to end	Day	10% 6% 3 6% 5% 5% 5% 5% 9% 9% 37%	2660
July	1st to 10th	Day	10% 6% 2 7% 5% 5% 5% 5% 7% 9% 37%	4440
	11th to 20th	Day	7% 4 2 5% 4 5% 5% 4 7% 11% 46%	4440
	21st to end	Day	7% 6% 2 7% 5% 6% 5% 4 7% 9% 41%	4543
August	1st to 10th	Day	11% 5% 2 6% 4 5% 5% 5% 6% 8% 43%	4104
	11th to 20th	Day	10% 6% 2 7% 5% 6% 5% 5% 8% 9% 38%	4044
	21st to end	Day	8% 6% 3 6% 6% 6% 6% 5% 7% 9% 39%	4468
September	1st to 10th	Day	10% 7% 2 6% 4 5% 6% 4 6% 9% 39%	2153
	11th to 20th	Day	9% 5% 2 6% 4 4 5% 4 7% 9% 46%	2090
	21st to end	Day	15% 7% 2 7% 5% 4 5% 3 7% 7% 37%	2090
October	1st to 10th	Day	13% 6% 2 6% 6% 5% 4 5% 6% 7% 41%	2045
	11th to 20th	Day	18% 9% 3 7% 5% 5% 5% 3 5% 7% 33%	1900
	21st to end	Day	19% 10% 3 8% 4 5% 4 3 6% 6% 31%	1929
November	1st to 10th	Day	12% 9% 3 8% 5% 5% 4 4 5% 6% 39%	1681
	11th to 20th	Day	15% 13% 3 9% 6% 5% 5% 3 5% 6% 31%	1710
	21st to end	Day	18% 14% 4 8% 4 4 4 4 4 6% 28%	1647
December	1st to 10th	Day	15% 15% 6% 12% 6% 6% 4 4 4 5% 23%	1520
	11th to 20th	Day	16% 16% 6% 10% 5% 6% 5% 4 6% 6% 21%	1762
	21st to end	Day	27% 20% 7% 12% 5% 4 4 4 3 5% 10%	2783
January	1st to 10th	Night	16% 15% 7% 11% 6% 5% 4 3 5% 5% 24%	4428
	11th to 20th	Night	15% 17% 8% 14% 6% 5% 6% 4 6% 5% 15%	4440
	21st to end	Night	24% 17% 8% 12% 5% 4 3 3 4 4 17%	4595
February	1st to 10th	Night	16% 15% 4 11% 8% 5% 5% 3 5% 5% 24%	2470
	11th to 20th	Night	14% 13% 5% 10% 6% 4 5% 4 5% 6% 27%	2261
	21st to end	Night	19% 11% 5% 9% 6% 4 4 3 5% 6% 28%	1884
March	1st to 10th	Night	16% 12% 4 8% 5% 4 3 3 4 6% 35%	3670
	11th to 20th	Night	9% 8% 2 6% 4 4 5% 4 6% 8% 42%	3480
	21st to end	Night	17% 9% 3 8% 5% 5% 4 4 4 5% 36%	3817
April	1st to 10th	Night	15% 11% 3 6% 6% 4 4 4 6% 7% 36%	1978
	11th to 20th	Night	18% 8% 3 5% 5% 4 3 4 6% 6% 37%	1729
	21st to end	Night	17% 9% 3 6% 4 3 5% 4 5% 5% 39%	1710
May	1st to 10th	Night	17% 9% 3 7% 4 4 4 3 5% 8% 35%	2813
	11th to 20th	Night	15% 7% 3 6% 4 5% 4 3 4 8% 41%	2812
	21st to end	Night	10% 6% 2 5% 4 4 4 3 5% 8% 48%	3079
June	1st to 10th	Night	11% 5% 2 6% 3 4 5% 3 6% 9% 47%	1520
	11th to 20th	Night	9% 6% 2 6% 4 5% 4 4 7% 9% 44%	1520
	21st to end	Night	9% 6% 2 4 4 3 4 4 6% 9% 48%	1520
July	1st to 10th	Night	8% 3 2 5% 5% 4 6% 5% 7% 10% 46%	2530
	11th to 20th	Night	8% 4 1 4 4 3 4 3 6% 8% 54%	2530
	21st to end	Night	5% 4 2 6% 5% 6% 4 5% 6% 10% 47%	2996
August	1st to 10th	Night	11% 6% 2 6% 4 4 5% 3 5% 9% 47%	2825
	11th to 20th	Night	8% 5% 2 6% 4 4 5% 4 5% 7% 49%	2785
	21st to end	Night	8% 5% 2 7% 4 5% 4 4 5% 8% 48%	3183
September	1st to 10th	Night	10% 6% 2 6% 4 4 4 3 5% 7% 49%	2007
	11th to 20th	Night	9% 5% 2 4 2 3 4 3 5% 7% 55%	2090
	21st to end	Night	14% 7% 2 6% 4 4 4 3 5% 7% 43%	2090
October	1st to 10th	Night	13% 7% 3 6% 3 3 3 3 4 6% 47%	2134
	11th to 20th	Night	18% 9% 3 6% 5% 4 5% 4 5% 5% 37%	2280
	21st to end	Night	21% 8% 3 7% 4 5% 4 4 5% 6% 33%	2666
November	1st to 10th	Night	12% 8% 3 6% 5% 4 4 3 5% 7% 43%	2420
	11th to 20th	Night	16% 11% 4 7% 5% 5% 5% 4 6% 6% 31%	2470
	21st to end	Night	19% 13% 4 8% 5% 4 3 3 6% 5% 29%	2528
December	1st to 10th	Night	17% 16% 5% 10% 6% 5% 4 4 5% 5% 21%	2660
	11th to 20th	Night	15% 15% 4 12% 5% 5% 5% 4 5% 6% 24%	3411
	21st to end	Night	28% 23% 6% 9% 5% 3 3 3 4 4 12%	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	64% 7% 11% 12% 5%	2528
	11th to 20th	Day	71% 7% 12% 7% 3	2530
	21st to end	Day	77% 5% 8% 6% 3 1	3061
February	1st to 10th	Day	63% 7% 9% 14% 7%	1710
	11th to 20th	Day	61% 5% 10% 16% 7% 1	1813
	21st to end	Day	58% 6% 12% 15% 7% 2	1570
March	1st to 10th	Day	59% 6% 11% 17% 6% 1	3181
	11th to 20th	Day	49% 8% 14% 20% 8% 2	3480
	21st to end	Day	56% 8% 11% 14% 9% 2	3815
April	1st to 10th	Day	51% 7% 11% 18% 12%	2218
	11th to 20th	Day	48% 6% 12% 20% 13% 2	2399
	21st to end	Day	49% 7% 13% 17% 13% 1	2470
May	1st to 10th	Day	46% 8% 12% 23% 10% 2	4120
	11th to 20th	Day	44% 10% 14% 22% 9% 1	4085
	21st to end	Day	36% 7% 12% 18% 23% 5%	4489
June	1st to 10th	Day	38% 8% 12% 26% 13% 3	2655
	11th to 20th	Day	39% 7% 14% 22% 16% 2	2660
	21st to end	Day	38% 9% 14% 21% 16% 2	2660
July	1st to 10th	Day	41% 6% 15% 20% 16% 2	4371
	11th to 20th	Day	30% 6% 13% 32% 17% 1	4365
	21st to end	Day	37% 7% 15% 19% 21% 2	4399
August	1st to 10th	Day	37% 7% 13% 26% 15% 1	4091
	11th to 20th	Day	40% 8% 11% 30% 11% 1	4083
	21st to end	Day	38% 7% 14% 27% 13% 1	4467
September	1st to 10th	Day	39% 8% 15% 22% 14% 2	2153
	11th to 20th	Day	32% 7% 13% 32% 15% 1	2090
	21st to end	Day	43% 7% 13% 23% 13%	2090
October	1st to 10th	Day	40% 7% 12% 26% 13% 2	2045
	11th to 20th	Day	49% 6% 13% 20% 11%	1900
	21st to end	Day	52% 7% 13% 18% 10% 1	1929
November	1st to 10th	Day	45% 7% 12% 23% 13% 1	1681
	11th to 20th	Day	53% 5% 14% 18% 8% 1	1710
	21st to end	Day	56% 7% 12% 18% 7%	1647
December	1st to 10th	Day	63% 7% 13% 13% 4	1520
	11th to 20th	Day	61% 7% 12% 15% 5%	1758
	21st to end	Day	78% 5% 9% 5% 3	2783
January	1st to 10th	Night	61% 6% 12% 15% 5% 1	4428
	11th to 20th	Night	68% 7% 12% 8% 4	4440
	21st to end	Night	71% 5% 10% 11% 3	4595
February	1st to 10th	Night	61% 7% 11% 14% 6% 1	2470
	11th to 20th	Night	56% 5% 11% 17% 9% 1	2262
	21st to end	Night	56% 5% 13% 16% 8% 1	1884
March	1st to 10th	Night	50% 5% 14% 24% 7%	3670
	11th to 20th	Night	36% 8% 15% 21% 18% 1	3480
	21st to end	Night	48% 6% 12% 22% 11% 1	3817
April	1st to 10th	Night	46% 7% 11% 21% 13% 2	1978
	11th to 20th	Night	44% 8% 11% 18% 18% 2	1729
	21st to end	Night	45% 7% 12% 18% 16% 3	1710
May	1st to 10th	Night	46% 7% 11% 20% 13% 2	2840
	11th to 20th	Night	41% 8% 11% 26% 12% 2	2813
	21st to end	Night	32% 7% 14% 21% 21% 5%	3087
June	1st to 10th	Night	34% 6% 12% 28% 18% 3	1520
	11th to 20th	Night	36% 9% 12% 25% 17% 2	1520
	21st to end	Night	33% 7% 14% 26% 20% 1	1520
July	1st to 10th	Night	31% 6% 13% 30% 14% 6%	2490
	11th to 20th	Night	27% 5% 14% 31% 21% 1	2482
	21st to end	Night	31% 7% 19% 19% 22% 2	2900
August	1st to 10th	Night	35% 6% 13% 27% 17% 1	2814
	11th to 20th	Night	33% 7% 11% 36% 11% 2	2812
	21st to end	Night	34% 6% 13% 31% 15% 1	3183
September	1st to 10th	Night	33% 8% 13% 27% 17% 2	2007
	11th to 20th	Night	28% 6% 11% 31% 22% 2	2090
	21st to end	Night	40% 7% 12% 27% 14% 1	2090
October	1st to 10th	Night	38% 5% 11% 25% 20% 1	2134
	11th to 20th	Night	48% 5% 12% 20% 14% 1	2280
	21st to end	Night	50% 7% 11% 23% 9% 1	2666
November	1st to 10th	Night	41% 6% 12% 25% 15% 1	2420
	11th to 20th	Night	51% 6% 14% 19% 8% 1	2470
	21st to end	Night	55% 7% 13% 18% 7%	2528
December	1st to 10th	Night	63% 7% 11% 13% 5%	2660
	11th to 20th	Night	59% 7% 13% 14% 6% 1	3414
	21st to end	Night	76% 6% 10% 6% 2	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	22% 22% 34% 16% 5% 1	270
	11th to 20th	Day	24% 16% 45% 14% 1 1	270
	21st to end	Day	27% 16% 34% 16% 4 1	297
February	1st to 10th	Day	24% 21% 36% 14% 2 1	270
	11th to 20th	Day	23% 21% 39% 15% 1	270
	21st to end	Day	24% 30% 34% 10% 1	225
March	1st to 10th	Day	26% 23% 32% 16% 3	305
	11th to 20th	Day	24% 13% 35% 21% 7% 1	460
	21st to end	Day	25% 17% 33% 19% 5% 1	506
April	1st to 10th	Day	19% 18% 33% 21% 8% 1	460
	11th to 20th	Day	26% 17% 32% 14% 7% 4	452
	21st to end	Day	25% 16% 30% 17% 10% 2	460
May	1st to 10th	Day	24% 14% 27% 21% 11% 3	463
	11th to 20th	Day	20% 10% 29% 22% 13% 7%	487
	21st to end	Day	12% 9% 23% 29% 18% 8%	529
June	1st to 10th	Day	12% 8% 30% 31% 14% 4	675
	11th to 20th	Day	13% 8% 31% 29% 15% 4	680
	21st to end	Day	12% 10% 30% 29% 14% 5%	680
July	1st to 10th	Day	9% 5% 25% 28% 23% 10%	671
	11th to 20th	Day	10% 8% 28% 28% 19% 7%	668
	21st to end	Day	9% 4 26% 28% 23% 9%	583
August	1st to 10th	Day	8% 5% 23% 27% 25% 13%	486
	11th to 20th	Day	12% 5% 21% 29% 21% 11%	479
	21st to end	Day	10% 5% 21% 28% 24% 12%	539
September	1st to 10th	Day	13% 6% 23% 24% 24% 9%	490
	11th to 20th	Day	10% 5% 17% 27% 27% 14%	490
	21st to end	Day	17% 11% 24% 21% 18% 8%	490
October	1st to 10th	Day	17% 11% 26% 22% 17% 7%	490
	11th to 20th	Day	21% 16% 28% 24% 9% 1	490
	21st to end	Day	26% 17% 34% 17% 6%	378
November	1st to 10th	Day	12% 21% 36% 20% 9% 1	273
	11th to 20th	Day	22% 23% 31% 18% 6% 1	270
	21st to end	Day	28% 18% 35% 13% 5%	239
December	1st to 10th	Day	22% 22% 36% 14% 7% 1	180
	11th to 20th	Day	26% 20% 38% 11% 4 1	186
	21st to end	Day	28% 25% 32% 14% 2	297
January	1st to 10th	Night	23% 15% 35% 21% 6% 1	950
	11th to 20th	Night	26% 14% 33% 22% 4 1	950
	21st to end	Night	20% 14% 34% 26% 5%	873
February	1st to 10th	Night	24% 13% 36% 25% 3	760
	11th to 20th	Night	23% 14% 34% 25% 3	743
	21st to end	Night	26% 14% 38% 21% 2	628
March	1st to 10th	Night	21% 12% 34% 27% 6%	760
	11th to 20th	Night	17% 17% 35% 25% 5% 1	760
	21st to end	Night	23% 12% 31% 27% 7% 1	836
April	1st to 10th	Night	18% 15% 34% 27% 4 1	648
	11th to 20th	Night	21% 10% 35% 25% 7% 1	563
	21st to end	Night	21% 8% 31% 32% 7%	570
May	1st to 10th	Night	19% 9% 31% 31% 9% 1	570
	11th to 20th	Night	21% 6% 27% 32% 13% 1	561
	21st to end	Night	11% 4 24% 38% 19% 2	617
June	1st to 10th	Night	12% 4 24% 46% 13% 1	570
	11th to 20th	Night	11% 5% 23% 44% 17%	570
	21st to end	Night	11% 4 24% 42% 19% 1	570
July	1st to 10th	Night	8% 2 19% 40% 27% 4	555
	11th to 20th	Night	9% 4 19% 39% 24% 4	552
	21st to end	Night	5% 2 20% 48% 23% 3	624
August	1st to 10th	Night	8% 3 17% 41% 27% 3	567
	11th to 20th	Night	10% 3 19% 36% 30% 3	564
	21st to end	Night	10% 3 17% 35% 32% 3	627
September	1st to 10th	Night	13% 5% 19% 34% 25% 4	677
	11th to 20th	Night	11% 4 17% 33% 31% 5%	760
	21st to end	Night	16% 7% 21% 31% 21% 4	760
October	1st to 10th	Night	16% 6% 27% 30% 18% 3	760
	11th to 20th	Night	21% 14% 29% 26% 9% 2	760
	21st to end	Night	24% 12% 32% 26% 5%	836
November	1st to 10th	Night	18% 12% 31% 27% 12% 1	745
	11th to 20th	Night	22% 16% 33% 21% 7% 1	760
	21st to end	Night	26% 14% 33% 21% 6% 1	760
December	1st to 10th	Night	24% 16% 35% 19% 6%	760
	11th to 20th	Night	25% 14% 37% 21% 3	871
	21st to end	Night	32% 12% 35% 19% 2	1045

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