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 2024-04-03.

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	15% 10% 4 7% 6% 4 5% 5% 5% 7% 32%	78792
	Night	16% 11% 5% 8% 6% 3 4 4 5% 6% 31%	81368
Transparency	Day	51% 6% 11% 19% 11% 1	78496
	Night	54% 6% 11% 18% 11% 1	81185
Seeing	Day	19% 15% 30% 21% 11% 4	14846
	Night	20% 12% 30% 26% 10% 1	24887

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% 11% 9% 4 4 4 4 4 19%	2527
	11th to 20th	Day	15% 16% 8% 14% 10% 9% 9% 4 3 4 9%	2530
	21st to end	Day	25% 20% 11% 13% 7% 3 3 3 3 4 10%	2828
February	1st to 10th	Day	15% 13% 6% 12% 11% 5% 5% 4 4 4 19%	1762
	11th to 20th	Day	15% 12% 6% 12% 9% 4 5% 4 4 5% 23%	1848
	21st to end	Day	16% 15% 7% 11% 6% 4 4 4 5% 6% 22%	1570
March	1st to 10th	Day	13% 12% 6% 7% 8% 5% 5% 6% 5% 6% 28%	1900
	11th to 20th	Day	12% 10% 5% 8% 7% 3 5% 4 5% 6% 34%	2052
	21st to end	Day	20% 12% 4 7% 5% 3 5% 4 5% 7% 28%	2346
April	1st to 10th	Day	20% 13% 4 6% 5% 3 4 5% 5% 6% 28%	2184
	11th to 20th	Day	17% 11% 3 5% 5% 3 5% 4 5% 6% 36%	2197
	21st to end	Day	18% 8% 3 7% 5% 3 5% 4 5% 7% 34%	2340
May	1st to 10th	Day	18% 8% 3 7% 7% 4 5% 4 6% 8% 32%	2340
	11th to 20th	Day	19% 7% 3 6% 6% 4 4 4 5% 7% 36%	2301
	21st to end	Day	12% 6% 3 5% 5% 3 5% 6% 6% 9% 40%	2655
June	1st to 10th	Day	10% 5% 2 6% 6% 3 5% 6% 6% 9% 42%	2520
	11th to 20th	Day	11% 5% 2 5% 6% 3 6% 5% 6% 8% 44%	2520
	21st to end	Day	11% 5% 3 5% 6% 4 6% 6% 7% 9% 37%	2520
July	1st to 10th	Day	7% 4 2 4 5% 3 5% 6% 7% 10% 47%	2520
	11th to 20th	Day	10% 4 2 4 5% 4 6% 4 7% 9% 44%	2520
	21st to end	Day	8% 5% 2 5% 5% 4 5% 6% 7% 10% 44%	2712
August	1st to 10th	Day	9% 4 2 5% 5% 4 6% 7% 6% 11% 41%	2327
	11th to 20th	Day	10% 4 3 5% 6% 4 6% 6% 6% 8% 42%	2303
	21st to end	Day	10% 5% 2 6% 5% 3 5% 6% 6% 8% 44%	2425
September	1st to 10th	Day	12% 6% 2 6% 6% 4 6% 5% 5% 7% 41%	2106
	11th to 20th	Day	11% 4 2 4 4 3 5% 5% 6% 9% 46%	1980
	21st to end	Day	12% 6% 3 6% 6% 3 4 5% 5% 9% 41%	1980
October	1st to 10th	Day	15% 7% 3 5% 6% 3 4 5% 5% 7% 40%	1980
	11th to 20th	Day	20% 9% 3 6% 6% 5% 5% 5% 6% 8% 28%	1780
	21st to end	Day	22% 11% 3 7% 6% 4 5% 4 4 6% 26%	1782
November	1st to 10th	Day	12% 11% 4 6% 4 2 5% 4 5% 7% 38%	1672
	11th to 20th	Day	16% 15% 6% 9% 7% 4 5% 4 4 7% 24%	1710
	21st to end	Day	20% 14% 7% 8% 5% 3 4 4 5% 6% 24%	1710
December	1st to 10th	Day	14% 19% 10% 10% 7% 3 4 5% 4 5% 18%	1644
	11th to 20th	Day	15% 17% 9% 12% 7% 3 5% 5% 4 6% 17%	1918
	21st to end	Day	22% 23% 8% 11% 8% 3 4 3 3 5% 10%	2783
January	1st to 10th	Night	17% 19% 9% 11% 7% 3 4 4 5% 5% 17%	4428
	11th to 20th	Night	15% 18% 9% 14% 8% 4 8% 5% 4 3 11%	4440
	21st to end	Night	26% 16% 9% 12% 8% 3 4 4 4 4 11%	4823
February	1st to 10th	Night	15% 16% 6% 11% 9% 5% 5% 5% 4 5% 21%	2413
	11th to 20th	Night	13% 14% 6% 10% 9% 4 6% 4 4 5% 26%	2218
	21st to end	Night	18% 10% 5% 10% 7% 3 4 4 5% 7% 26%	1884
March	1st to 10th	Night	16% 11% 4 7% 6% 4 4 4 4 6% 34%	2280
	11th to 20th	Night	13% 9% 3 7% 5% 2 4 4 5% 6% 40%	2126
	21st to end	Night	20% 10% 4 7% 5% 3 4 3 5% 6% 33%	2269
April	1st to 10th	Night	15% 10% 4 6% 5% 3 5% 4 5% 7% 35%	1820
	11th to 20th	Night	18% 9% 4 5% 5% 3 3 4 5% 6% 37%	1711
	21st to end	Night	18% 9% 3 5% 5% 3 5% 4 5% 7% 38%	1620
May	1st to 10th	Night	16% 10% 4 6% 7% 3 5% 5% 5% 7% 33%	1620
	11th to 20th	Night	21% 5% 3 4 5% 3 5% 4 5% 8% 39%	1592
	21st to end	Night	11% 5% 3 5% 6% 2 5% 5% 6% 10% 42%	1617
June	1st to 10th	Night	10% 4 2 5% 4 3 3 5% 5% 10% 48%	1440
	11th to 20th	Night	10% 5% 3 4 6% 3 4 5% 6% 10% 45%	1440
	21st to end	Night	9% 4 3 5% 6% 3 5% 5% 5% 10% 45%	1440
July	1st to 10th	Night	6% 4 2 5% 4 2 5% 5% 7% 10% 52%	1440
	11th to 20th	Night	8% 3 2 3 5% 3 3 4 6% 8% 54%	1440
	21st to end	Night	5% 3 3 5% 4 3 5% 6% 6% 8% 51%	1605
August	1st to 10th	Night	8% 4 2 4 5% 3 4 4 6% 8% 52%	1611
	11th to 20th	Night	8% 4 2 5% 4 3 4 5% 6% 10% 47%	1598
	21st to end	Night	9% 4 2 4 5% 3 4 4 5% 7% 51%	1928
September	1st to 10th	Night	10% 7% 2 5% 5% 3 4 4 5% 7% 48%	1835
	11th to 20th	Night	11% 5% 2 5% 4 2 3 4 4 7% 53%	1980
	21st to end	Night	14% 6% 3 5% 4 3 4 4 5% 7% 44%	1980
October	1st to 10th	Night	16% 7% 2 5% 5% 3 3 3 4 7% 45%	1980
	11th to 20th	Night	19% 10% 3 7% 6% 3 4 4 4 6% 34%	2176
	21st to end	Night	23% 11% 3 6% 5% 3 4 5% 4 6% 31%	2574
November	1st to 10th	Night	14% 10% 4 6% 5% 3 5% 4 5% 5% 40%	2406
	11th to 20th	Night	15% 14% 5% 7% 7% 3 5% 5% 6% 6% 27%	2470
	21st to end	Night	18% 14% 7% 7% 5% 3 4 4 4 6% 26%	2470
December	1st to 10th	Night	17% 18% 8% 11% 7% 4 5% 3 4 5% 18%	2531
	11th to 20th	Night	15% 17% 8% 12% 8% 4 4 4 4 5% 18%	3279
	21st to end	Night	27% 21% 6% 9% 6% 3 4 4 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	55% 7% 11% 19% 7% 1	1900
	11th to 20th	Day	51% 6% 10% 19% 12% 2	2052
	21st to end	Day	57% 5% 10% 18% 8% 1	2346
April	1st to 10th	Day	56% 5% 10% 19% 11%	2184
	11th to 20th	Day	49% 6% 10% 19% 13% 2	2197
	21st to end	Day	50% 6% 12% 16% 15% 2	2340
May	1st to 10th	Day	51% 6% 12% 20% 10% 1	2340
	11th to 20th	Day	48% 6% 10% 20% 15% 1	2305
	21st to end	Day	40% 7% 14% 24% 14% 1	2655
June	1st to 10th	Day	38% 7% 11% 27% 16% 2	2520
	11th to 20th	Day	36% 8% 12% 24% 19% 2	2520
	21st to end	Day	40% 8% 13% 21% 15% 2	2520
July	1st to 10th	Day	32% 8% 11% 26% 19% 4	2451
	11th to 20th	Day	35% 7% 12% 26% 18% 2	2445
	21st to end	Day	33% 8% 13% 24% 19% 2	2561
August	1st to 10th	Day	35% 10% 14% 26% 13% 2	2314
	11th to 20th	Day	37% 7% 14% 26% 12% 2	2303
	21st to end	Day	37% 7% 11% 25% 16% 3	2425
September	1st to 10th	Day	41% 7% 14% 21% 15% 2	2106
	11th to 20th	Day	34% 6% 13% 30% 17%	1980
	21st to end	Day	41% 6% 12% 24% 17%	1980
October	1st to 10th	Day	43% 7% 9% 26% 13% 1	1980
	11th to 20th	Day	54% 6% 11% 20% 9%	1780
	21st to end	Day	59% 6% 11% 16% 7% 1	1782
November	1st to 10th	Day	45% 5% 14% 22% 13% 1	1672
	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	53% 4 12% 21% 9% 1	2280
	11th to 20th	Night	44% 6% 12% 21% 15% 2	2126
	21st to end	Night	53% 4 10% 22% 10% 2	2269
April	1st to 10th	Night	49% 6% 11% 21% 13% 1	1820
	11th to 20th	Night	48% 4 10% 19% 17% 3	1711
	21st to end	Night	46% 7% 11% 20% 15% 3	1620
May	1st to 10th	Night	51% 5% 10% 21% 11% 2	1620
	11th to 20th	Night	44% 6% 11% 19% 18% 2	1593
	21st to end	Night	37% 9% 14% 25% 14% 2	1618
June	1st to 10th	Night	32% 7% 11% 30% 18% 3	1440
	11th to 20th	Night	34% 8% 14% 24% 18% 2	1440
	21st to end	Night	34% 7% 16% 24% 16% 2	1440
July	1st to 10th	Night	27% 8% 13% 26% 22% 4	1400
	11th to 20th	Night	28% 8% 13% 28% 21% 2	1392
	21st to end	Night	30% 7% 14% 24% 22% 4	1516
August	1st to 10th	Night	29% 7% 13% 32% 17% 2	1600
	11th to 20th	Night	31% 7% 16% 27% 17% 2	1598
	21st to end	Night	31% 6% 11% 26% 22% 3	1928
September	1st to 10th	Night	35% 8% 9% 27% 19% 3	1835
	11th to 20th	Night	32% 5% 10% 32% 20% 1	1980
	21st to end	Night	40% 6% 11% 26% 16% 1	1980
October	1st to 10th	Night	41% 4 10% 26% 17% 1	1980
	11th to 20th	Night	52% 5% 12% 19% 12% 1	2176
	21st to end	Night	55% 6% 9% 20% 9% 1	2574
November	1st to 10th	Night	47% 5% 10% 23% 15% 1	2406
	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	26% 18% 33% 17% 5% 1	428
	11th to 20th	Day	28% 21% 27% 13% 8% 3	412
	21st to end	Day	25% 20% 29% 18% 6% 1	420
May	1st to 10th	Day	25% 16% 31% 19% 7% 2	423
	11th to 20th	Day	22% 13% 30% 19% 11% 5%	447
	21st to end	Day	14% 13% 27% 25% 15% 5%	609
June	1st to 10th	Day	12% 11% 32% 31% 10% 4	630
	11th to 20th	Day	14% 10% 32% 28% 13% 3	630
	21st to end	Day	13% 12% 33% 28% 11% 3	630
July	1st to 10th	Day	7% 6% 25% 32% 20% 10%	621
	11th to 20th	Day	12% 7% 29% 28% 17% 7%	618
	21st to end	Day	10% 6% 28% 30% 19% 6%	653
August	1st to 10th	Day	8% 5% 25% 27% 22% 13%	446
	11th to 20th	Day	11% 7% 22% 31% 22% 8%	439
	21st to end	Day	11% 7% 25% 29% 21% 8%	495
September	1st to 10th	Day	17% 9% 21% 24% 21% 8%	450
	11th to 20th	Day	9% 6% 21% 32% 24% 7%	450
	21st to end	Day	16% 15% 22% 27% 14% 7%	450
October	1st to 10th	Day	18% 11% 28% 24% 13% 6%	450
	11th to 20th	Day	24% 19% 30% 22% 4	401
	21st to end	Day	29% 24% 35% 9% 3	297
November	1st to 10th	Day	22% 18% 35% 19% 6% 1	270
	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	23% 14% 33% 22% 7%	806
April	1st to 10th	Night	18% 15% 37% 24% 5% 1	546
	11th to 20th	Night	22% 14% 34% 24% 5% 1	533
	21st to end	Night	23% 9% 35% 26% 6% 1	540
May	1st to 10th	Night	22% 8% 33% 29% 7% 1	540
	11th to 20th	Night	23% 8% 29% 29% 11% 1	531
	21st to end	Night	14% 5% 30% 32% 17% 2	584
June	1st to 10th	Night	12% 5% 29% 39% 15% 1	540
	11th to 20th	Night	14% 3 27% 41% 15%	540
	21st to end	Night	11% 3 26% 38% 20% 2	540
July	1st to 10th	Night	8% 2 20% 38% 27% 4	525
	11th to 20th	Night	8% 2 23% 42% 21% 3	522
	21st to end	Night	7% 3 22% 43% 25% 1	591
August	1st to 10th	Night	10% 2 16% 42% 27% 3	537
	11th to 20th	Night	9% 2 17% 41% 26% 4	534
	21st to end	Night	11% 3 20% 34% 28% 4	594
September	1st to 10th	Night	12% 5% 21% 34% 22% 5%	575
	11th to 20th	Night	13% 5% 19% 35% 25% 3	720
	21st to end	Night	18% 7% 22% 30% 18% 5%	720
October	1st to 10th	Night	19% 8% 26% 28% 18% 2	720
	11th to 20th	Night	24% 14% 30% 25% 7% 1	720
	21st to end	Night	28% 16% 30% 20% 5%	792
November	1st to 10th	Night	21% 14% 28% 27% 9% 1	740
	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 2024-03-31 06:08:55. Version ac07

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