Minden
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Minden clear sky chart from 2005-11-06 to 2024-03-01.

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	9% 6% 3 5% 4 3 4 4 5% 7% 50%	78840
	Night	8% 6% 2 5% 4 3 4 4 5% 7% 52%	80604
Transparency	Day	34% 3 13% 28% 18% 3	78557
	Night	33% 3 12% 28% 20% 4	80410
Seeing	Day	12% 8% 31% 32% 15% 3	14713
	Night	11% 9% 36% 34% 9% 1	24833

By Month

Percentage Cloud Cover SW (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	6% 12% 5% 8% 5% 2 4 4 5% 6% 43%	2538
	11th to 20th	Day	7% 10% 4 8% 6% 2 4 5% 5% 7% 41%	2666
	21st to end	Day	6% 7% 4 10% 6% 3 3 4 4 6% 46%	3135
February	1st to 10th	Day	10% 8% 4 6% 6% 3 5% 5% 5% 6% 41%	1742
	11th to 20th	Day	5% 6% 4 6% 5% 3 3 4 6% 8% 50%	1849
	21st to end	Day	8% 7% 3 4 4 3 4 3 5% 6% 54%	1570
March	1st to 10th	Day	8% 6% 2 4 4 3 3 4 5% 6% 55%	1827
	11th to 20th	Day	14% 7% 3 5% 3 2 3 4 6% 7% 47%	1980
	21st to end	Day	12% 10% 4 6% 5% 3 4 4 5% 6% 40%	2178
April	1st to 10th	Day	11% 5% 3 4 4 3 4 4 5% 7% 50%	2086
	11th to 20th	Day	14% 7% 3 5% 4 3 4 3 6% 7% 43%	2223
	21st to end	Day	17% 6% 2 4 4 3 4 4 5% 8% 44%	2340
May	1st to 10th	Day	13% 6% 3 5% 4 3 4 5% 5% 7% 44%	2340
	11th to 20th	Day	15% 6% 3 5% 4 3 3 5% 4 8% 44%	2302
	21st to end	Day	13% 6% 3 5% 5% 3 5% 5% 7% 9% 38%	2531
June	1st to 10th	Day	6% 3 1 3 4 2 4 5% 6% 8% 58%	2398
	11th to 20th	Day	8% 4 1 4 4 2 3 4 7% 9% 54%	2520
	21st to end	Day	6% 3 2 4 4 2 4 4 8% 9% 55%	2520
July	1st to 10th	Day	6% 3 2 4 5% 3 4 5% 6% 9% 54%	2520
	11th to 20th	Day	5% 3 1 3 4 3 4 4 6% 8% 58%	2479
	21st to end	Day	6% 3 2 4 4 3 5% 6% 6% 10% 50%	2546
August	1st to 10th	Day	7% 4 2 6% 5% 3 5% 7% 7% 10% 45%	2328
	11th to 20th	Day	5% 4 1 3 4 3 4 5% 6% 8% 56%	2301
	21st to end	Day	8% 4 2 4 3 3 5% 3 4 6% 58%	2466
September	1st to 10th	Day	12% 4 1 3 4 3 3 3 4 6% 56%	2057
	11th to 20th	Day	10% 4 2 3 4 2 3 4 4 7% 58%	1980
	21st to end	Day	8% 4 1 4 2 2 3 4 4 6% 62%	1980
October	1st to 10th	Day	15% 5% 1 3 3 1 3 3 4 7% 55%	1972
	11th to 20th	Day	9% 5% 1 3 3 2 3 2 3 6% 62%	1800
	21st to end	Day	12% 7% 2 4 3 2 2 2 4 5% 56%	1846
November	1st to 10th	Day	7% 4 2 3 4 3 4 4 5% 7% 59%	1673
	11th to 20th	Day	7% 5% 2 5% 4 3 3 3 4 6% 59%	1710
	21st to end	Day	9% 7% 3 4 4 3 4 4 3 7% 54%	1710
December	1st to 10th	Day	6% 6% 3 5% 5% 3 5% 4 5% 7% 53%	1710
	11th to 20th	Day	7% 8% 3 5% 5% 3 4 4 4 7% 50%	2161
	21st to end	Day	11% 12% 3 11% 6% 3 4 4 4 5% 37%	2856
January	1st to 10th	Night	6% 11% 3 9% 7% 3 3 4 5% 6% 42%	4417
	11th to 20th	Night	5% 8% 3 6% 5% 3 5% 5% 5% 5% 51%	4299
	21st to end	Night	8% 9% 4 8% 7% 3 4 4 4 5% 44%	4532
February	1st to 10th	Night	9% 8% 4 6% 6% 2 5% 4 5% 7% 44%	2455
	11th to 20th	Night	5% 7% 4 6% 6% 3 4 5% 5% 8% 48%	2218
	21st to end	Night	5% 7% 3 5% 5% 3 3 4 5% 5% 54%	1884
March	1st to 10th	Night	10% 7% 3 4 3 2 3 3 3 7% 55%	2138
	11th to 20th	Night	11% 8% 2 5% 4 2 4 4 4 6% 51%	1980
	21st to end	Night	12% 9% 3 5% 5% 3 4 5% 6% 7% 41%	2178
April	1st to 10th	Night	10% 6% 2 5% 5% 3 5% 5% 5% 8% 47%	1872
	11th to 20th	Night	13% 5% 2 4 5% 3 5% 5% 6% 7% 45%	1683
	21st to end	Night	13% 5% 2 4 3 2 3 4 5% 8% 51%	1620
May	1st to 10th	Night	14% 7% 2 4 4 3 5% 4 6% 8% 43%	1620
	11th to 20th	Night	13% 5% 2 5% 4 3 3 4 5% 7% 48%	1593
	21st to end	Night	13% 5% 3 5% 5% 2 6% 4 6% 10% 42%	1745
June	1st to 10th	Night	4 3 2 4 4 3 4 5% 5% 10% 56%	1558
	11th to 20th	Night	8% 3 2 4 4 3 4 4 6% 7% 54%	1440
	21st to end	Night	4 3 2 3 3 3 4 4 6% 11% 57%	1440
July	1st to 10th	Night	6% 4 2 3 5% 3 4 6% 8% 9% 50%	1440
	11th to 20th	Night	2 2 1 3 4 3 5% 5% 7% 9% 58%	1479
	21st to end	Night	4 3 1 4 5% 3 5% 5% 8% 9% 54%	1772
August	1st to 10th	Night	5% 5% 2 5% 4 3 4 5% 7% 9% 51%	1611
	11th to 20th	Night	5% 3 2 4 5% 3 4 4 7% 9% 55%	1600
	21st to end	Night	6% 3 2 4 4 2 3 4 4 7% 63%	1886
September	1st to 10th	Night	9% 4 1 2 3 2 2 3 4 5% 64%	1903
	11th to 20th	Night	7% 3 1 4 4 2 3 5% 5% 5% 60%	1980
	21st to end	Night	7% 3 1 4 3 3 3 4 4 6% 62%	1980
October	1st to 10th	Night	14% 4 2 4 4 2 3 3 4 6% 54%	1980
	11th to 20th	Night	9% 5% 2 4 3 2 3 3 3 6% 62%	2150
	21st to end	Night	10% 5% 1 3 3 2 3 4 4 6% 59%	2506
November	1st to 10th	Night	4 3 2 3 3 2 3 3 5% 7% 65%	2405
	11th to 20th	Night	7% 4 2 4 3 3 3 4 5% 7% 58%	2470
	21st to end	Night	8% 5% 2 4 3 2 3 3 5% 7% 58%	2470
December	1st to 10th	Night	6% 5% 3 4 5% 3 3 5% 4 8% 54%	2470
	11th to 20th	Night	7% 5% 2 5% 4 2 3 4 5% 8% 56%	3036
	21st to end	Night	13% 12% 4 7% 5% 2 3 3 4 6% 42%	4794

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	43% 2 13% 28% 13% 1	2539
	11th to 20th	Day	43% 5% 14% 21% 14% 3	2666
	21st to end	Day	42% 2 15% 26% 14% 2	3135
February	1st to 10th	Day	44% 4 14% 23% 11% 3	1742
	11th to 20th	Day	34% 3 16% 27% 16% 4	1859
	21st to end	Day	33% 3 12% 29% 17% 6%	1570
March	1st to 10th	Day	30% 4 13% 28% 20% 4	1827
	11th to 20th	Day	37% 4 11% 26% 17% 4	1980
	21st to end	Day	46% 4 15% 24% 10% 1	2178
April	1st to 10th	Day	34% 4 15% 27% 17% 2	2086
	11th to 20th	Day	40% 3 14% 23% 16% 3	2226
	21st to end	Day	40% 3 12% 30% 14% 1	2340
May	1st to 10th	Day	40% 4 14% 25% 15% 2	2340
	11th to 20th	Day	41% 3 17% 26% 12%	2306
	21st to end	Day	40% 6% 18% 24% 10% 2	2531
June	1st to 10th	Day	25% 4 20% 35% 14% 2	2398
	11th to 20th	Day	27% 4 15% 32% 18% 4	2520
	21st to end	Day	25% 4 15% 31% 20% 5%	2520
July	1st to 10th	Day	28% 4 15% 30% 22% 2	2451
	11th to 20th	Day	24% 4 13% 32% 23% 5%	2404
	21st to end	Day	27% 6% 16% 33% 18%	2405
August	1st to 10th	Day	33% 6% 18% 28% 13% 1	2314
	11th to 20th	Day	26% 4 13% 36% 19% 2	2301
	21st to end	Day	29% 3 11% 26% 25% 6%	2466
September	1st to 10th	Day	31% 3 10% 24% 24% 7%	2057
	11th to 20th	Day	29% 3 11% 30% 25% 3	1980
	21st to end	Day	25% 2 10% 35% 27% 2	1980
October	1st to 10th	Day	32% 3 8% 28% 26% 2	1972
	11th to 20th	Day	27% 2 8% 32% 23% 7%	1800
	21st to end	Day	33% 2 10% 26% 23% 6%	1846
November	1st to 10th	Day	27% 2 13% 33% 22% 4	1673
	11th to 20th	Day	29% 2 10% 28% 26% 5%	1710
	21st to end	Day	34% 2 12% 25% 22% 4	1710
December	1st to 10th	Day	33% 3 15% 30% 18% 2	1710
	11th to 20th	Day	35% 3 12% 36% 13% 1	2159
	21st to end	Day	52% 2 9% 22% 14% 1	2856
January	1st to 10th	Night	44% 2 11% 27% 15% 1	4417
	11th to 20th	Night	36% 2 13% 29% 20% 1	4299
	21st to end	Night	44% 2 12% 23% 17% 1	4532
February	1st to 10th	Night	41% 4 12% 24% 15% 4	2455
	11th to 20th	Night	35% 4 11% 31% 16% 3	2218
	21st to end	Night	32% 3 11% 22% 23% 8%	1884
March	1st to 10th	Night	33% 3 11% 27% 21% 5%	2138
	11th to 20th	Night	36% 4 9% 25% 21% 5%	1980
	21st to end	Night	43% 3 15% 24% 13% 1	2178
April	1st to 10th	Night	36% 4 13% 24% 20% 3	1872
	11th to 20th	Night	38% 4 14% 26% 15% 2	1683
	21st to end	Night	32% 5% 13% 29% 19% 2	1620
May	1st to 10th	Night	39% 5% 15% 24% 16% 1	1620
	11th to 20th	Night	37% 4 17% 27% 14% 1	1594
	21st to end	Night	38% 7% 18% 23% 11% 2	1746
June	1st to 10th	Night	24% 6% 20% 32% 16% 2	1558
	11th to 20th	Night	29% 5% 14% 28% 19% 5%	1440
	21st to end	Night	23% 3 17% 33% 20% 4	1440
July	1st to 10th	Night	27% 5% 17% 30% 17% 4	1400
	11th to 20th	Night	21% 5% 16% 30% 23% 5%	1431
	21st to end	Night	23% 4 18% 35% 17% 3	1673
August	1st to 10th	Night	29% 5% 21% 29% 13% 3	1601
	11th to 20th	Night	26% 4 15% 34% 18% 3	1600
	21st to end	Night	24% 4 12% 26% 27% 8%	1886
September	1st to 10th	Night	23% 3 9% 29% 26% 10%	1903
	11th to 20th	Night	26% 4 9% 30% 26% 5%	1980
	21st to end	Night	25% 3 10% 29% 28% 5%	1980
October	1st to 10th	Night	33% 3 8% 27% 26% 4	1980
	11th to 20th	Night	27% 2 7% 27% 28% 9%	2150
	21st to end	Night	28% 3 11% 25% 23% 9%	2506
November	1st to 10th	Night	21% 3 11% 31% 27% 8%	2405
	11th to 20th	Night	27% 2 9% 30% 27% 6%	2470
	21st to end	Night	28% 3 12% 26% 26% 4	2470
December	1st to 10th	Night	30% 3 13% 31% 19% 3	2470
	11th to 20th	Night	29% 2 11% 37% 19% 1	3037
	21st to end	Night	47% 2 10% 27% 12% 2	4794

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	14% 11% 39% 26% 9% 1	270
	11th to 20th	Day	16% 14% 35% 29% 6%	270
	21st to end	Day	12% 8% 45% 26% 8% 1	297
February	1st to 10th	Day	16% 14% 43% 21% 6%	270
	11th to 20th	Day	9% 11% 46% 26% 7% 1	270
	21st to end	Day	13% 13% 52% 18% 4	225
March	1st to 10th	Day	13% 10% 46% 22% 8% 1	240
	11th to 20th	Day	22% 10% 33% 24% 11%	240
	21st to end	Day	23% 13% 39% 19% 6% 1	264
April	1st to 10th	Day	14% 17% 40% 23% 5% 1	346
	11th to 20th	Day	17% 15% 40% 24% 3	504
	21st to end	Day	20% 15% 34% 20% 10% 2	600
May	1st to 10th	Day	16% 8% 33% 32% 10% 1	603
	11th to 20th	Day	18% 9% 32% 25% 14% 2	625
	21st to end	Day	15% 8% 33% 29% 14% 1	679
June	1st to 10th	Day	4 6% 27% 35% 20% 7%	630
	11th to 20th	Day	8% 5% 34% 35% 16% 2	630
	21st to end	Day	7% 7% 27% 38% 18% 2	630
July	1st to 10th	Day	6% 2 19% 39% 29% 4	621
	11th to 20th	Day	5% 1 20% 45% 24% 5%	618
	21st to end	Day	6% 3 18% 40% 28% 6%	684
August	1st to 10th	Day	7% 3 17% 46% 23% 4	626
	11th to 20th	Day	7% 3 19% 45% 23% 3	615
	21st to end	Day	9% 3 19% 41% 23% 5%	585
September	1st to 10th	Day	14% 4 24% 36% 18% 3	347
	11th to 20th	Day	8% 5% 24% 40% 17% 6%	270
	21st to end	Day	15% 7% 31% 30% 13% 4	270
October	1st to 10th	Day	20% 9% 22% 30% 15% 4	270
	11th to 20th	Day	8% 12% 38% 29% 11% 2	270
	21st to end	Day	22% 12% 34% 25% 6% 1	297
November	1st to 10th	Day	11% 12% 37% 26% 12% 3	270
	11th to 20th	Day	10% 15% 43% 23% 8% 1	270
	21st to end	Day	19% 14% 34% 22% 9% 2	270
December	1st to 10th	Day	9% 10% 43% 27% 9% 2	270
	11th to 20th	Day	15% 8% 44% 27% 7%	270
	21st to end	Day	16% 11% 44% 26% 2	297
January	1st to 10th	Night	10% 10% 40% 33% 6% 1	950
	11th to 20th	Night	10% 12% 41% 30% 7% 1	950
	21st to end	Night	9% 9% 44% 30% 7%	1045
February	1st to 10th	Night	14% 8% 45% 28% 5%	935
	11th to 20th	Night	9% 11% 45% 30% 5%	744
	21st to end	Night	11% 11% 45% 29% 4	628
March	1st to 10th	Night	13% 14% 41% 27% 5%	694
	11th to 20th	Night	15% 11% 39% 28% 7% 1	540
	21st to end	Night	18% 12% 40% 22% 7%	594
April	1st to 10th	Night	13% 13% 44% 28% 2	540
	11th to 20th	Night	15% 16% 40% 27% 3	533
	21st to end	Night	16% 13% 34% 29% 8% 1	540
May	1st to 10th	Night	16% 8% 38% 31% 7%	540
	11th to 20th	Night	15% 9% 37% 30% 9% 1	531
	21st to end	Night	15% 7% 35% 30% 12% 1	584
June	1st to 10th	Night	5% 6% 28% 45% 13% 2	540
	11th to 20th	Night	9% 6% 36% 37% 11%	540
	21st to end	Night	4 4 33% 46% 12%	540
July	1st to 10th	Night	6% 3 25% 41% 26%	525
	11th to 20th	Night	2 2 21% 56% 18% 1	522
	21st to end	Night	3 2 18% 52% 24% 1	591
August	1st to 10th	Night	6% 2 18% 53% 20% 1	537
	11th to 20th	Night	8% 3 24% 47% 18% 1	534
	21st to end	Night	7% 3 22% 44% 22% 2	594
September	1st to 10th	Night	10% 3 29% 46% 12% 1	540
	11th to 20th	Night	9% 5% 31% 41% 14% 1	540
	21st to end	Night	8% 7% 33% 39% 12% 1	540
October	1st to 10th	Night	17% 7% 32% 31% 13%	540
	11th to 20th	Night	12% 10% 37% 33% 6% 1	710
	21st to end	Night	14% 10% 34% 31% 10% 1	922
November	1st to 10th	Night	7% 9% 36% 39% 7%	925
	11th to 20th	Night	10% 10% 41% 31% 8% 1	950
	21st to end	Night	11% 10% 36% 32% 10% 1	950
December	1st to 10th	Night	10% 10% 43% 33% 4	950
	11th to 20th	Night	12% 9% 39% 33% 7%	950
	21st to end	Night	15% 10% 39% 30% 5%	1045

Page generated at 2024-02-27 05:30:14. Version ac07

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