Bucyrus
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bucyrus clear sky chart from 2005-11-06 to 2024-01-31.

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% 3 5% 5% 5% 7% 32%	75584
	Night	15% 10% 4 7% 6% 3 4 4 5% 7% 34%	74547
Transparency	Day	51% 6% 12% 19% 11% 1	75300
	Night	50% 5% 11% 19% 12% 2	74351
Seeing	Day	19% 11% 27% 23% 14% 6%	14268
	Night	20% 9% 28% 29% 13% 2	23901

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	18% 16% 8% 12% 8% 5% 4 4 4 5% 16%	1703
	11th to 20th	Day	19% 19% 8% 13% 8% 4 5% 3 4 4 14%	1710
	21st to end	Day	18% 17% 9% 12% 10% 4 4 4 4 4 15%	1872
February	1st to 10th	Day	19% 16% 5% 11% 10% 4 4 3 4 5% 18%	1620
	11th to 20th	Day	14% 12% 7% 14% 8% 4 5% 5% 4 6% 21%	1712
	21st to end	Day	17% 14% 6% 11% 5% 3 5% 5% 4 5% 26%	1480
March	1st to 10th	Day	18% 12% 7% 8% 7% 4 4 4 4 5% 26%	1869
	11th to 20th	Day	16% 14% 6% 8% 6% 3 5% 4 4 7% 26%	1980
	21st to end	Day	23% 12% 6% 8% 7% 3 4 4 3 7% 24%	2178
April	1st to 10th	Day	13% 13% 5% 7% 6% 3 5% 5% 6% 6% 31%	2039
	11th to 20th	Day	17% 10% 3 6% 7% 3 5% 4 5% 6% 34%	2276
	21st to end	Day	21% 9% 3 6% 6% 3 4 4 5% 7% 32%	2340
May	1st to 10th	Day	17% 9% 4 7% 6% 4 5% 6% 6% 6% 32%	2340
	11th to 20th	Day	19% 8% 3 6% 6% 3 5% 5% 6% 7% 31%	2301
	21st to end	Day	9% 5% 2 7% 7% 4 6% 6% 7% 10% 38%	2531
June	1st to 10th	Day	14% 6% 3 5% 6% 4 5% 6% 6% 8% 37%	2340
	11th to 20th	Day	11% 6% 3 6% 6% 4 5% 6% 6% 8% 38%	2480
	21st to end	Day	11% 4 3 6% 6% 4 5% 6% 8% 10% 38%	2520
July	1st to 10th	Day	10% 6% 3 6% 5% 4 6% 6% 7% 10% 39%	2520
	11th to 20th	Day	10% 4 2 5% 5% 3 5% 6% 7% 11% 43%	2386
	21st to end	Day	9% 5% 3 6% 5% 4 6% 6% 8% 10% 40%	2547
August	1st to 10th	Day	9% 4 2 5% 6% 4 6% 6% 7% 9% 42%	2327
	11th to 20th	Day	10% 5% 2 6% 5% 4 6% 7% 7% 10% 37%	2303
	21st to end	Day	9% 6% 3 5% 6% 4 5% 5% 7% 10% 41%	2547
September	1st to 10th	Day	13% 6% 2 5% 5% 3 5% 5% 5% 7% 45%	1998
	11th to 20th	Day	10% 5% 3 7% 5% 3 5% 4 5% 8% 45%	1980
	21st to end	Day	17% 7% 3 5% 4 2 3 4 5% 6% 44%	1980
October	1st to 10th	Day	14% 8% 3 6% 5% 3 5% 4 5% 7% 40%	1926
	11th to 20th	Day	15% 9% 3 7% 6% 3 4 5% 6% 7% 36%	1800
	21st to end	Day	21% 11% 4 6% 6% 3 5% 4 5% 7% 28%	1900
November	1st to 10th	Day	11% 9% 4 6% 5% 3 5% 3 5% 6% 43%	1672
	11th to 20th	Day	18% 13% 4 7% 4 3 4 4 5% 6% 32%	1710
	21st to end	Day	18% 15% 6% 8% 5% 4 3 3 3 7% 28%	1710
December	1st to 10th	Day	17% 18% 8% 11% 7% 3 4 4 4 5% 17%	1710
	11th to 20th	Day	16% 16% 7% 10% 7% 4 5% 4 5% 6% 20%	2153
	21st to end	Day	22% 23% 9% 11% 7% 4 4 4 3 4 10%	3124
January	1st to 10th	Night	17% 17% 6% 10% 7% 4 4 5% 4 4 21%	2459
	11th to 20th	Night	19% 17% 6% 11% 8% 4 4 4 3 4 19%	2470
	21st to end	Night	17% 18% 7% 10% 8% 3 4 4 4 5% 20%	2711
February	1st to 10th	Night	20% 13% 7% 10% 6% 3 5% 4 4 5% 21%	2340
	11th to 20th	Night	16% 14% 5% 10% 7% 4 4 4 5% 5% 24%	2130
	21st to end	Night	21% 14% 5% 9% 8% 3 4 4 3 4 26%	1776
March	1st to 10th	Night	17% 12% 4 7% 8% 3 4 4 4 4 32%	2089
	11th to 20th	Night	15% 10% 3 6% 6% 3 4 5% 5% 7% 36%	1980
	21st to end	Night	19% 10% 4 8% 6% 2 4 4 5% 6% 32%	2178
April	1st to 10th	Night	15% 10% 4 7% 6% 3 5% 5% 5% 7% 34%	1936
	11th to 20th	Night	17% 8% 4 6% 5% 3 3 5% 6% 7% 36%	1632
	21st to end	Night	16% 8% 3 6% 6% 4 4 5% 5% 7% 36%	1620
May	1st to 10th	Night	19% 8% 3 7% 7% 4 6% 5% 5% 6% 30%	1620
	11th to 20th	Night	20% 7% 2 5% 5% 3 4 4 4 8% 37%	1592
	21st to end	Night	9% 5% 2 4 5% 3 5% 6% 9% 11% 41%	1744
June	1st to 10th	Night	9% 6% 3 5% 4 3 4 6% 5% 7% 46%	1620
	11th to 20th	Night	8% 7% 2 5% 4 3 5% 5% 7% 10% 44%	1474
	21st to end	Night	9% 4 2 4 5% 3 5% 6% 6% 11% 45%	1440
July	1st to 10th	Night	8% 5% 2 4 6% 3 3 5% 7% 7% 48%	1440
	11th to 20th	Night	8% 4 2 5% 4 3 5% 6% 5% 10% 49%	1570
	21st to end	Night	7% 5% 2 5% 4 4 5% 5% 5% 9% 48%	1771
August	1st to 10th	Night	5% 4 2 5% 4 4 5% 7% 8% 9% 45%	1611
	11th to 20th	Night	9% 6% 2 5% 5% 3 4 5% 7% 9% 45%	1598
	21st to end	Night	7% 3 2 4 5% 3 6% 4 6% 8% 51%	1806
September	1st to 10th	Night	10% 6% 3 5% 5% 2 4 4 4 7% 50%	1944
	11th to 20th	Night	11% 5% 2 3 4 3 4 4 4 7% 54%	1980
	21st to end	Night	14% 6% 3 4 4 3 4 5% 5% 6% 47%	1980
October	1st to 10th	Night	11% 6% 2 5% 5% 4 4 4 5% 7% 47%	2034
	11th to 20th	Night	18% 9% 3 6% 5% 3 4 4 4 6% 38%	2160
	21st to end	Night	23% 8% 3 5% 5% 3 4 4 4 5% 34%	2452
November	1st to 10th	Night	14% 8% 3 6% 4 3 3 3 5% 6% 43%	2406
	11th to 20th	Night	16% 13% 4 7% 4 3 4 4 4 7% 34%	2470
	21st to end	Night	19% 14% 5% 7% 5% 3 4 5% 5% 6% 27%	2470
December	1st to 10th	Night	19% 16% 6% 10% 6% 3 3 4 5% 6% 21%	2470
	11th to 20th	Night	18% 15% 7% 9% 6% 2 4 4 4 5% 24%	3042
	21st to end	Night	24% 20% 8% 10% 6% 3 4 4 4 5% 13%	4532

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	71% 5% 9% 12% 4	1704
	11th to 20th	Day	75% 4 11% 8% 2	1710
	21st to end	Day	74% 4 7% 10% 4 1	1872
February	1st to 10th	Day	70% 5% 8% 12% 5%	1620
	11th to 20th	Day	66% 5% 7% 14% 7% 1	1722
	21st to end	Day	61% 5% 12% 14% 7% 2	1480
March	1st to 10th	Day	61% 5% 10% 18% 6%	1869
	11th to 20th	Day	59% 4 10% 16% 9% 1	1980
	21st to end	Day	62% 4 10% 18% 6% 1	2178
April	1st to 10th	Day	52% 7% 13% 17% 11% 1	2039
	11th to 20th	Day	50% 6% 12% 17% 13% 2	2276
	21st to end	Day	52% 5% 11% 20% 11% 2	2340
May	1st to 10th	Day	51% 8% 12% 18% 9% 1	2340
	11th to 20th	Day	51% 8% 11% 17% 12% 2	2305
	21st to end	Day	40% 9% 14% 23% 13% 1	2531
June	1st to 10th	Day	43% 7% 12% 24% 13% 1	2340
	11th to 20th	Day	42% 8% 13% 22% 14% 1	2480
	21st to end	Day	39% 9% 14% 21% 15% 3	2520
July	1st to 10th	Day	39% 8% 12% 22% 17% 2	2451
	11th to 20th	Day	34% 8% 14% 25% 17% 2	2314
	21st to end	Day	36% 9% 16% 24% 14% 3	2405
August	1st to 10th	Day	37% 7% 15% 26% 14% 1	2314
	11th to 20th	Day	39% 8% 15% 25% 12% 2	2303
	21st to end	Day	38% 7% 14% 19% 17% 5%	2547
September	1st to 10th	Day	39% 8% 12% 21% 17% 4	1998
	11th to 20th	Day	39% 6% 11% 25% 18% 2	1980
	21st to end	Day	42% 4 12% 22% 19%	1980
October	1st to 10th	Day	43% 6% 11% 22% 17% 1	1926
	11th to 20th	Day	46% 5% 12% 21% 14% 2	1800
	21st to end	Day	57% 4 13% 16% 10% 1	1900
November	1st to 10th	Day	43% 4 12% 23% 16% 2	1672
	11th to 20th	Day	54% 4 11% 20% 10% 2	1710
	21st to end	Day	59% 4 10% 17% 9% 1	1710
December	1st to 10th	Day	70% 4 8% 13% 3	1710
	11th to 20th	Day	65% 3 10% 16% 5%	2150
	21st to end	Day	80% 4 8% 6% 2	3124
January	1st to 10th	Night	67% 4 8% 14% 7%	2459
	11th to 20th	Night	70% 4 10% 11% 4	2470
	21st to end	Night	68% 4 9% 13% 5% 1	2711
February	1st to 10th	Night	67% 4 9% 14% 6%	2340
	11th to 20th	Night	62% 4 10% 15% 8% 1	2131
	21st to end	Night	63% 4 8% 15% 8% 1	1776
March	1st to 10th	Night	57% 4 10% 18% 11% 1	2089
	11th to 20th	Night	47% 5% 10% 22% 12% 3	1980
	21st to end	Night	53% 5% 9% 21% 11% 2	2178
April	1st to 10th	Night	49% 6% 13% 16% 14% 2	1936
	11th to 20th	Night	46% 5% 12% 17% 17% 3	1632
	21st to end	Night	47% 6% 10% 21% 13% 2	1620
May	1st to 10th	Night	54% 6% 10% 16% 11% 3	1620
	11th to 20th	Night	46% 6% 12% 17% 17% 2	1593
	21st to end	Night	34% 9% 15% 26% 14% 3	1745
June	1st to 10th	Night	37% 6% 12% 25% 16% 4	1620
	11th to 20th	Night	33% 8% 14% 25% 16% 3	1474
	21st to end	Night	33% 8% 14% 25% 16% 4	1440
July	1st to 10th	Night	34% 8% 12% 23% 18% 5%	1400
	11th to 20th	Night	30% 8% 14% 27% 20% 2	1519
	21st to end	Night	33% 7% 15% 25% 17% 4	1672
August	1st to 10th	Night	31% 10% 13% 27% 18% 1	1600
	11th to 20th	Night	34% 7% 14% 27% 16% 1	1598
	21st to end	Night	29% 8% 15% 23% 20% 5%	1806
September	1st to 10th	Night	35% 6% 12% 25% 17% 5%	1944
	11th to 20th	Night	31% 6% 10% 27% 24% 2	1980
	21st to end	Night	37% 6% 10% 23% 21% 2	1980
October	1st to 10th	Night	36% 6% 11% 25% 19% 2	2034
	11th to 20th	Night	48% 4 8% 24% 14% 1	2160
	21st to end	Night	53% 4 9% 21% 11% 2	2452
November	1st to 10th	Night	42% 4 12% 22% 17% 2	2406
	11th to 20th	Night	51% 4 10% 21% 12% 2	2470
	21st to end	Night	58% 4 12% 17% 8% 1	2470
December	1st to 10th	Night	65% 5% 9% 15% 6%	2470
	11th to 20th	Night	62% 4 12% 17% 5%	3044
	21st to end	Night	74% 4 10% 9% 3	4532

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	25% 19% 34% 15% 6% 1	270
	11th to 20th	Day	22% 19% 43% 11% 5% 1	270
	21st to end	Day	27% 21% 29% 18% 4	294
February	1st to 10th	Day	35% 15% 36% 14%	240
	11th to 20th	Day	26% 20% 36% 17% 2	240
	21st to end	Day	23% 24% 38% 13% 1	198
March	1st to 10th	Day	23% 17% 37% 19% 5%	309
	11th to 20th	Day	23% 17% 35% 18% 5% 1	420
	21st to end	Day	31% 13% 30% 21% 5% 1	462
April	1st to 10th	Day	22% 13% 32% 22% 9% 2	420
	11th to 20th	Day	20% 19% 28% 18% 10% 4	412
	21st to end	Day	25% 14% 31% 19% 8% 2	420
May	1st to 10th	Day	26% 11% 28% 24% 8% 3	423
	11th to 20th	Day	23% 7% 28% 24% 11% 6%	447
	21st to end	Day	12% 6% 24% 26% 21% 10%	485
June	1st to 10th	Day	15% 5% 26% 33% 17% 6%	450
	11th to 20th	Day	15% 6% 25% 27% 21% 6%	590
	21st to end	Day	14% 7% 27% 27% 19% 6%	630
July	1st to 10th	Day	13% 2 19% 28% 22% 16%	621
	11th to 20th	Day	12% 3 20% 28% 24% 13%	487
	21st to end	Day	11% 3 17% 28% 28% 13%	488
August	1st to 10th	Day	12% 4 14% 25% 28% 17%	446
	11th to 20th	Day	12% 3 19% 28% 26% 12%	439
	21st to end	Day	12% 3 18% 25% 27% 14%	495
September	1st to 10th	Day	16% 3 18% 26% 26% 11%	450
	11th to 20th	Day	11% 3 15% 23% 31% 16%	450
	21st to end	Day	18% 8% 21% 24% 18% 10%	450
October	1st to 10th	Day	14% 8% 26% 24% 19% 9%	450
	11th to 20th	Day	16% 18% 31% 23% 10% 2	450
	21st to end	Day	27% 14% 34% 19% 5% 1	415
November	1st to 10th	Day	15% 17% 33% 21% 11% 3	270
	11th to 20th	Day	26% 18% 30% 18% 8% 1	270
	21st to end	Day	28% 18% 33% 19% 1	270
December	1st to 10th	Day	23% 21% 34% 16% 5% 1	270
	11th to 20th	Day	24% 20% 37% 17% 3	270
	21st to end	Day	33% 18% 31% 16% 2	297
January	1st to 10th	Night	25% 16% 36% 19% 4	760
	11th to 20th	Night	29% 15% 36% 17% 3 1	760
	21st to end	Night	25% 15% 36% 22% 3	835
February	1st to 10th	Night	25% 13% 39% 20% 3	720
	11th to 20th	Night	26% 13% 34% 24% 3	703
	21st to end	Night	29% 13% 39% 17% 3	592
March	1st to 10th	Night	23% 13% 35% 22% 7%	720
	11th to 20th	Night	20% 13% 34% 25% 6% 1	720
	21st to end	Night	25% 10% 31% 26% 8%	792
April	1st to 10th	Night	21% 12% 35% 26% 6% 1	676
	11th to 20th	Night	21% 9% 35% 23% 9% 2	533
	21st to end	Night	22% 8% 38% 23% 8% 1	540
May	1st to 10th	Night	23% 6% 31% 30% 9% 1	540
	11th to 20th	Night	23% 5% 26% 32% 13% 2	531
	21st to end	Night	11% 3 23% 38% 23% 2	584
June	1st to 10th	Night	11% 3 24% 43% 18% 1	540
	11th to 20th	Night	12% 4 19% 43% 21% 1	540
	21st to end	Night	11% 3 21% 42% 21% 1	540
July	1st to 10th	Night	11% 2 14% 42% 29% 4	525
	11th to 20th	Night	9% 2 17% 41% 27% 4	522
	21st to end	Night	9% 2 14% 42% 31% 3	591
August	1st to 10th	Night	8% 1 11% 47% 29% 4	537
	11th to 20th	Night	12% 3 11% 39% 30% 5%	534
	21st to end	Night	9% 2 13% 38% 35% 5%	594
September	1st to 10th	Night	12% 4 15% 35% 28% 5%	684
	11th to 20th	Night	13% 3 14% 35% 30% 6%	720
	21st to end	Night	16% 6% 21% 33% 21% 4	720
October	1st to 10th	Night	14% 6% 25% 34% 19% 3	720
	11th to 20th	Night	22% 10% 31% 27% 10% 1	720
	21st to end	Night	28% 11% 29% 25% 7%	792
November	1st to 10th	Night	19% 8% 33% 27% 12% 1	740
	11th to 20th	Night	23% 14% 32% 24% 6% 2	760
	21st to end	Night	26% 11% 34% 23% 6% 1	760
December	1st to 10th	Night	27% 15% 32% 21% 5%	760
	11th to 20th	Night	25% 13% 36% 22% 4	760
	21st to end	Night	30% 14% 33% 20% 3	836

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