Battle Creek
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Battle Creek clear sky chart from 2005-11-06 to 2024-11-04.

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 8% 5% 5% 5% 4 5% 7% 33%	101169
	Night	15% 11% 4 8% 5% 4 4 3 5% 6% 33%	97858
Transparency	Day	48% 6% 11% 21% 12% 1	104769
	Night	50% 5% 11% 20% 13% 1	102399
Seeing	Day	18% 15% 30% 22% 11% 4	15755
	Night	20% 12% 30% 27% 10% 1	25591

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% 19% 6% 12% 8% 5% 5% 3 4 4 19%	2527
	11th to 20th	Day	15% 17% 7% 15% 8% 12% 7% 3 3 4 9%	2530
	21st to end	Day	25% 21% 10% 13% 6% 4 3 2 3 4 10%	2828
February	1st to 10th	Day	14% 15% 6% 13% 11% 6% 4 3 5% 4 19%	1762
	11th to 20th	Day	14% 13% 6% 14% 8% 5% 4 4 4 5% 23%	1848
	21st to end	Day	15% 18% 5% 12% 5% 5% 4 4 5% 5% 22%	1570
March	1st to 10th	Day	15% 16% 5% 7% 6% 5% 4 4 4 6% 28%	3120
	11th to 20th	Day	11% 9% 5% 9% 7% 6% 6% 4 6% 6% 32%	3416
	21st to end	Day	20% 13% 5% 9% 5% 5% 5% 3 5% 6% 25%	3899
April	1st to 10th	Day	18% 14% 3 7% 5% 5% 4 4 5% 6% 29%	2280
	11th to 20th	Day	17% 11% 3 6% 4 4 5% 3 5% 6% 36%	2321
	21st to end	Day	17% 8% 3 8% 5% 4 5% 3 6% 7% 34%	2470
May	1st to 10th	Day	19% 8% 2 7% 5% 5% 4 3 6% 8% 33%	4082
	11th to 20th	Day	15% 8% 3 6% 5% 4 4 4 7% 9% 36%	4081
	21st to end	Day	11% 6% 2 6% 4 4 4 4 6% 8% 44%	4698
June	1st to 10th	Day	10% 6% 2 7% 5% 4 5% 5% 6% 9% 42%	2660
	11th to 20th	Day	10% 5% 2 6% 5% 4 5% 5% 6% 8% 44%	2660
	21st to end	Day	10% 6% 3 6% 5% 5% 6% 5% 7% 9% 37%	2660
July	1st to 10th	Day	11% 6% 2 7% 5% 5% 5% 5% 7% 9% 37%	4440
	11th to 20th	Day	8% 4 2 4 4 4 6% 3 7% 10% 49%	4440
	21st to end	Day	7% 5% 2 7% 5% 5% 6% 4 7% 9% 43%	4756
August	1st to 10th	Day	12% 5% 2 5% 4 4 5% 5% 6% 9% 42%	4104
	11th to 20th	Day	11% 5% 2 6% 4 5% 4 4 6% 7% 45%	4044
	21st to end	Day	8% 5% 2 7% 5% 5% 5% 5% 6% 8% 45%	4257
September	1st to 10th	Day	11% 6% 2 6% 5% 5% 5% 4 5% 7% 43%	2223
	11th to 20th	Day	11% 4 2 5% 3 3 5% 4 6% 9% 48%	2090
	21st to end	Day	13% 7% 3 7% 5% 4 4 3 5% 8% 40%	2090
October	1st to 10th	Day	14% 8% 3 6% 5% 4 3 4 5% 7% 42%	2090
	11th to 20th	Day	19% 9% 3 8% 5% 5% 5% 3 5% 8% 30%	1878
	21st to end	Day	21% 12% 3 8% 5% 5% 5% 4 5% 7% 27%	1881
November	1st to 10th	Day	12% 12% 3 7% 3 3 5% 4 5% 7% 38%	1699
	11th to 20th	Day	15% 16% 5% 10% 6% 5% 5% 3 4 6% 24%	1710
	21st to end	Day	20% 15% 6% 8% 5% 4 4 3 5% 6% 24%	1710
December	1st to 10th	Day	14% 21% 8% 11% 7% 4 4 4 4 5% 18%	1644
	11th to 20th	Day	14% 18% 8% 12% 6% 4 4 4 5% 6% 17%	1918
	21st to end	Day	21% 24% 7% 13% 6% 4 3 3 3 5% 10%	2783
January	1st to 10th	Night	17% 19% 8% 13% 6% 4 4 3 4 5% 17%	4428
	11th to 20th	Night	15% 19% 9% 16% 6% 6% 7% 4 4 3 11%	4440
	21st to end	Night	25% 18% 8% 14% 6% 4 3 3 4 4 11%	4823
February	1st to 10th	Night	15% 18% 5% 12% 9% 5% 4 4 4 4 21%	2413
	11th to 20th	Night	13% 15% 5% 11% 7% 5% 5% 3 5% 5% 26%	2218
	21st to end	Night	18% 11% 5% 11% 6% 4 4 4 5% 6% 26%	1884
March	1st to 10th	Night	17% 11% 4 8% 4 4 4 3 4 7% 35%	3733
	11th to 20th	Night	10% 9% 3 7% 4 3 4 4 5% 7% 45%	3529
	21st to end	Night	18% 12% 5% 10% 5% 4 4 3 5% 5% 31%	3762
April	1st to 10th	Night	15% 12% 3 6% 5% 4 3 3 5% 7% 36%	1900
	11th to 20th	Night	19% 9% 3 6% 4 4 4 3 4 6% 37%	1807
	21st to end	Night	17% 9% 3 7% 4 4 4 3 5% 7% 38%	1710
May	1st to 10th	Night	15% 10% 3 7% 5% 4 5% 4 5% 9% 33%	2813
	11th to 20th	Night	19% 6% 3 5% 4 3 4 3 4 7% 42%	2812
	21st to end	Night	13% 7% 2 6% 4 4 4 4 6% 8% 43%	2848
June	1st to 10th	Night	11% 5% 2 5% 4 4 3 4 5% 10% 47%	1520
	11th to 20th	Night	10% 6% 2 5% 5% 4 4 4 7% 10% 44%	1520
	21st to end	Night	9% 4 2 6% 5% 4 5% 4 7% 9% 45%	1520
July	1st to 10th	Night	9% 5% 2 6% 4 4 5% 4 7% 11% 44%	2530
	11th to 20th	Night	8% 3 1 4 4 3 4 3 5% 7% 57%	2530
	21st to end	Night	7% 5% 3 6% 4 4 5% 5% 6% 9% 47%	2804
August	1st to 10th	Night	11% 5% 2 6% 4 4 4 3 6% 9% 48%	2825
	11th to 20th	Night	11% 6% 2 6% 3 4 4 4 6% 9% 44%	2785
	21st to end	Night	10% 6% 2 7% 5% 4 4 4 5% 7% 46%	3396
September	1st to 10th	Night	9% 7% 2 5% 4 3 4 4 6% 7% 49%	1937
	11th to 20th	Night	10% 5% 2 5% 3 3 4 3 4 7% 54%	2090
	21st to end	Night	15% 7% 2 6% 4 4 4 4 5% 6% 43%	2090
October	1st to 10th	Night	15% 7% 2 5% 4 3 3 3 4 6% 47%	2090
	11th to 20th	Night	18% 11% 3 8% 5% 4 4 3 4 6% 35%	2298
	21st to end	Night	21% 11% 3 7% 4 4 4 3 5% 6% 32%	2717
November	1st to 10th	Night	14% 11% 4 6% 5% 4 4 3 5% 5% 40%	2452
	11th to 20th	Night	14% 16% 4 9% 6% 4 4 4 6% 6% 27%	2470
	21st to end	Night	18% 15% 6% 8% 5% 5% 4 3 4 6% 26%	2470
December	1st to 10th	Night	17% 20% 6% 12% 6% 5% 4 2 5% 5% 17%	2531
	11th to 20th	Night	15% 19% 8% 13% 6% 5% 4 3 4 5% 18%	3279
	21st to end	Night	27% 21% 6% 10% 5% 4 4 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	70% 5% 10% 13% 2	2528
	11th to 20th	Day	81% 4 7% 5% 2	2530
	21st to end	Day	80% 3 8% 7% 2	2828
February	1st to 10th	Day	68% 5% 9% 12% 6%	1762
	11th to 20th	Day	64% 4 8% 15% 8% 1	1858
	21st to end	Day	64% 6% 11% 13% 6% 1	1570
March	1st to 10th	Day	57% 7% 10% 20% 7%	3120
	11th to 20th	Day	50% 7% 13% 20% 8% 1	3416
	21st to end	Day	61% 6% 9% 16% 7% 1	3899
April	1st to 10th	Day	55% 5% 10% 19% 11%	2280
	11th to 20th	Day	49% 6% 10% 20% 13% 2	2321
	21st to end	Day	50% 6% 11% 16% 15% 2	2470
May	1st to 10th	Day	48% 7% 11% 21% 13% 1	4120
	11th to 20th	Day	42% 9% 14% 24% 10% 1	4085
	21st to end	Day	37% 6% 11% 20% 23% 2	4711
June	1st to 10th	Day	38% 7% 11% 26% 16% 2	2660
	11th to 20th	Day	36% 8% 12% 25% 19% 2	2660
	21st to end	Day	41% 8% 12% 21% 15% 2	2660
July	1st to 10th	Day	42% 6% 13% 20% 16% 3	4371
	11th to 20th	Day	29% 7% 14% 31% 18% 2	4365
	21st to end	Day	35% 8% 15% 19% 22% 2	4606
August	1st to 10th	Day	37% 8% 13% 25% 16% 1	4091
	11th to 20th	Day	36% 7% 12% 30% 14% 1	4083
	21st to end	Day	35% 7% 12% 30% 14% 2	4256
September	1st to 10th	Day	39% 7% 13% 22% 16% 2	2223
	11th to 20th	Day	32% 6% 13% 29% 19% 1	2090
	21st to end	Day	42% 6% 12% 23% 17%	2090
October	1st to 10th	Day	30% 4 8% 38% 18% 1	3480
	11th to 20th	Day	41% 4 11% 25% 18%	3094
	21st to end	Day	49% 4 11% 24% 11% 2	3081
November	1st to 10th	Day	45% 5% 14% 22% 13% 1	1699
	11th to 20th	Day	62% 5% 9% 17% 6% 1	1710
	21st to end	Day	62% 5% 14% 14% 5%	1710
December	1st to 10th	Day	68% 5% 10% 13% 3 1	1644
	11th to 20th	Day	67% 6% 12% 12% 3	1915
	21st to end	Day	78% 5% 8% 6% 4	2783
January	1st to 10th	Night	69% 5% 10% 11% 5% 1	4428
	11th to 20th	Night	78% 4 8% 6% 4	4440
	21st to end	Night	77% 4 9% 7% 2	4823
February	1st to 10th	Night	66% 5% 10% 12% 6% 1	2413
	11th to 20th	Night	60% 6% 10% 17% 7%	2219
	21st to end	Night	59% 5% 12% 16% 7% 2	1884
March	1st to 10th	Night	49% 6% 12% 24% 8% 1	3733
	11th to 20th	Night	38% 6% 14% 21% 19% 2	3529
	21st to end	Night	55% 5% 12% 19% 9% 1	3762
April	1st to 10th	Night	48% 6% 10% 21% 13% 1	1900
	11th to 20th	Night	48% 4 10% 19% 17% 2	1807
	21st to end	Night	45% 7% 11% 19% 15% 3	1710
May	1st to 10th	Night	46% 8% 10% 22% 13% 1	2840
	11th to 20th	Night	42% 6% 10% 24% 17% 1	2813
	21st to end	Night	37% 8% 12% 21% 21% 2	2856
June	1st to 10th	Night	32% 7% 11% 30% 18% 2	1520
	11th to 20th	Night	35% 8% 14% 24% 18% 2	1520
	21st to end	Night	35% 7% 16% 24% 17% 2	1520
July	1st to 10th	Night	34% 6% 13% 26% 15% 7%	2490
	11th to 20th	Night	26% 7% 12% 30% 23% 2	2482
	21st to end	Night	33% 7% 16% 17% 25% 3	2715
August	1st to 10th	Night	33% 6% 12% 33% 14% 1	2814
	11th to 20th	Night	34% 6% 12% 30% 16% 1	2812
	21st to end	Night	36% 6% 10% 29% 16% 2	3396
September	1st to 10th	Night	33% 8% 9% 27% 20% 3	1937
	11th to 20th	Night	31% 5% 9% 32% 22% 1	2090
	21st to end	Night	41% 6% 10% 26% 16% 1	2090
October	1st to 10th	Night	28% 3 9% 35% 24% 1	3480
	11th to 20th	Night	43% 4 11% 21% 21%	3821
	21st to end	Night	41% 4 9% 29% 16% 1	4467
November	1st to 10th	Night	47% 5% 10% 23% 14% 1	2452
	11th to 20th	Night	57% 5% 13% 16% 8% 1	2470
	21st to end	Night	60% 5% 12% 17% 5%	2470
December	1st to 10th	Night	69% 5% 9% 11% 6%	2531
	11th to 20th	Night	69% 6% 10% 11% 4	3281
	21st to end	Night	76% 4 10% 7% 3	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% 26% 35% 13% 4	270
	11th to 20th	Day	24% 25% 39% 7% 4	270
	21st to end	Day	27% 25% 32% 14% 2	297
February	1st to 10th	Day	28% 23% 33% 13% 1 1	270
	11th to 20th	Day	29% 26% 32% 13% 1	270
	21st to end	Day	29% 32% 30% 8% 1	225
March	1st to 10th	Day	22% 30% 36% 10% 2	270
	11th to 20th	Day	23% 19% 35% 18% 5%	422
	21st to end	Day	30% 18% 32% 14% 4 1	506
April	1st to 10th	Day	24% 20% 34% 16% 5% 1	460
	11th to 20th	Day	28% 21% 29% 12% 7% 3	452
	21st to end	Day	25% 20% 29% 19% 6% 1	460
May	1st to 10th	Day	24% 16% 31% 20% 7% 2	463
	11th to 20th	Day	21% 13% 30% 20% 12% 5%	487
	21st to end	Day	13% 13% 28% 26% 15% 5%	660
June	1st to 10th	Day	12% 13% 31% 30% 10% 4	680
	11th to 20th	Day	13% 9% 34% 28% 13% 3	680
	21st to end	Day	13% 13% 33% 27% 11% 3	680
July	1st to 10th	Day	8% 7% 27% 31% 19% 9%	671
	11th to 20th	Day	11% 7% 29% 27% 18% 7%	668
	21st to end	Day	9% 6% 28% 30% 20% 7%	706
August	1st to 10th	Day	9% 5% 26% 26% 22% 13%	486
	11th to 20th	Day	11% 7% 22% 32% 21% 7%	479
	21st to end	Day	10% 6% 25% 29% 22% 8%	539
September	1st to 10th	Day	16% 9% 23% 23% 22% 8%	490
	11th to 20th	Day	9% 6% 20% 31% 27% 8%	490
	21st to end	Day	17% 14% 22% 26% 14% 7%	490
October	1st to 10th	Day	17% 11% 28% 25% 13% 5%	490
	11th to 20th	Day	23% 18% 31% 23% 5%	438
	21st to end	Day	28% 23% 36% 11% 3	330
November	1st to 10th	Day	22% 19% 35% 19% 5% 1	279
	11th to 20th	Day	26% 26% 31% 14% 4	270
	21st to end	Day	29% 21% 39% 11% 1	270
December	1st to 10th	Day	27% 32% 27% 10% 4	270
	11th to 20th	Day	22% 31% 34% 12% 2	270
	21st to end	Day	25% 30% 34% 9% 1	297
January	1st to 10th	Night	22% 20% 33% 20% 4	950
	11th to 20th	Night	25% 18% 32% 20% 4 1	950
	21st to end	Night	22% 15% 36% 24% 3	1010
February	1st to 10th	Night	24% 18% 34% 20% 3	760
	11th to 20th	Night	21% 19% 35% 22% 3	743
	21st to end	Night	25% 20% 37% 16% 3	628
March	1st to 10th	Night	22% 17% 32% 23% 5% 1	760
	11th to 20th	Night	18% 16% 38% 22% 6%	760
	21st to end	Night	24% 15% 33% 22% 7%	806
April	1st to 10th	Night	18% 16% 37% 24% 5% 1	570
	11th to 20th	Night	23% 15% 33% 23% 5% 1	563
	21st to end	Night	23% 10% 35% 25% 6% 1	570
May	1st to 10th	Night	22% 8% 32% 30% 7% 1	570
	11th to 20th	Night	22% 9% 29% 29% 10% 1	561
	21st to end	Night	14% 5% 30% 32% 16% 2	617
June	1st to 10th	Night	12% 6% 29% 39% 14% 1	570
	11th to 20th	Night	13% 3 28% 40% 15%	570
	21st to end	Night	11% 4 27% 38% 19% 2	570
July	1st to 10th	Night	8% 3 21% 38% 26% 4	555
	11th to 20th	Night	9% 2 24% 41% 21% 4	552
	21st to end	Night	7% 2 21% 43% 26% 1	624
August	1st to 10th	Night	10% 2 17% 42% 27% 3	567
	11th to 20th	Night	9% 2 18% 41% 25% 4	564
	21st to end	Night	11% 3 20% 34% 29% 4	627
September	1st to 10th	Night	12% 5% 22% 34% 22% 5%	607
	11th to 20th	Night	12% 5% 19% 35% 26% 3	760
	21st to end	Night	19% 7% 23% 30% 17% 4	760
October	1st to 10th	Night	18% 9% 27% 28% 17% 1	760
	11th to 20th	Night	23% 14% 29% 25% 8% 1	760
	21st to end	Night	27% 16% 31% 21% 6%	836
November	1st to 10th	Night	21% 14% 28% 27% 9% 1	755
	11th to 20th	Night	23% 17% 35% 20% 5% 1	760
	21st to end	Night	25% 16% 34% 20% 4	760
December	1st to 10th	Night	26% 20% 34% 16% 4	821
	11th to 20th	Night	24% 17% 39% 17% 3	950
	21st to end	Night	32% 17% 35% 15% 1	1045

Page generated at 2024-11-01 22:47:44. Version ac07

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