Maintz Conservation Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Maintz Conservation Area clear sky chart from 2005-11-06 to 2024-01-27.

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	12% 6% 3 5% 5% 3 4 5% 5% 8% 43%	74885
	Night	13% 6% 3 5% 5% 3 4 4 5% 7% 46%	75183
Transparency	Day	40% 4 11% 25% 17% 3	74594
	Night	39% 3 10% 25% 19% 4	74995
Seeing	Day	14% 6% 22% 27% 21% 10%	14405
	Night	17% 6% 25% 33% 17% 2	24364

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	17% 9% 3 6% 6% 2 4 3 4 6% 41%	1517
	11th to 20th	Day	18% 8% 3 7% 5% 3 4 3 5% 6% 38%	1650
	21st to end	Day	12% 10% 4 6% 6% 3 3 4 5% 5% 41%	1836
February	1st to 10th	Day	16% 11% 3 6% 5% 3 4 4 4 6% 38%	1678
	11th to 20th	Day	16% 8% 4 6% 5% 3 4 4 5% 7% 38%	1748
	21st to end	Day	16% 10% 3 5% 6% 3 4 4 6% 6% 37%	1480
March	1st to 10th	Day	15% 7% 2 5% 6% 3 4 4 4 6% 44%	1800
	11th to 20th	Day	19% 9% 3 7% 5% 3 4 4 5% 5% 36%	1965
	21st to end	Day	20% 8% 4 7% 6% 3 4 4 5% 7% 33%	2318
April	1st to 10th	Day	10% 5% 3 5% 4 3 5% 5% 6% 7% 46%	2160
	11th to 20th	Day	16% 8% 3 5% 5% 2 4 4 4 6% 41%	2134
	21st to end	Day	16% 7% 4 5% 5% 3 4 5% 5% 7% 39%	2160
May	1st to 10th	Day	15% 6% 3 6% 5% 4 5% 5% 5% 9% 37%	2214
	11th to 20th	Day	15% 6% 2 5% 5% 3 4 5% 5% 8% 41%	2342
	21st to end	Day	8% 6% 3 7% 6% 4 7% 7% 7% 10% 36%	2725
June	1st to 10th	Day	9% 4 2 4 6% 3 5% 5% 6% 9% 46%	2520
	11th to 20th	Day	4 3 2 4 4 4 6% 5% 7% 9% 51%	2520
	21st to end	Day	5% 3 2 4 5% 3 5% 5% 7% 12% 48%	2520
July	1st to 10th	Day	7% 5% 2 6% 5% 4 6% 6% 8% 11% 41%	2520
	11th to 20th	Day	5% 2 1 4 5% 4 5% 7% 8% 12% 47%	2520
	21st to end	Day	5% 4 2 5% 5% 3 6% 7% 7% 9% 45%	2604
August	1st to 10th	Day	6% 4 2 5% 6% 3 5% 7% 7% 11% 43%	2243
	11th to 20th	Day	10% 5% 2 5% 6% 3 6% 6% 7% 10% 40%	2125
	21st to end	Day	7% 5% 2 5% 5% 3 5% 5% 6% 11% 47%	2376
September	1st to 10th	Day	10% 5% 3 4 5% 3 4 5% 6% 8% 48%	2160
	11th to 20th	Day	9% 5% 3 5% 4 3 5% 4 6% 8% 49%	2105
	21st to end	Day	10% 5% 2 3 4 2 3 5% 5% 8% 54%	1980
October	1st to 10th	Day	9% 4 2 3 3 2 3 5% 4 7% 58%	1857
	11th to 20th	Day	13% 6% 2 4 4 2 3 4 4 6% 52%	1800
	21st to end	Day	18% 7% 3 4 4 2 3 3 5% 5% 46%	1953
November	1st to 10th	Day	11% 4 2 4 4 2 3 4 4 6% 55%	1672
	11th to 20th	Day	12% 7% 3 5% 5% 3 4 4 3 6% 48%	1710
	21st to end	Day	17% 8% 3 4 4 2 4 4 4 5% 43%	1710
December	1st to 10th	Day	14% 9% 3 5% 5% 3 4 4 5% 6% 42%	1562
	11th to 20th	Day	15% 8% 3 7% 6% 3 4 4 4 6% 39%	1918
	21st to end	Day	19% 14% 4 7% 6% 3 4 4 4 5% 31%	2783
January	1st to 10th	Night	15% 8% 3 5% 5% 3 4 4 5% 6% 43%	2648
	11th to 20th	Night	19% 8% 4 6% 5% 2 4 3 5% 6% 38%	2527
	21st to end	Night	15% 8% 3 7% 5% 2 4 4 5% 6% 41%	2665
February	1st to 10th	Night	18% 11% 5% 6% 4 3 4 4 4 6% 36%	2281
	11th to 20th	Night	16% 7% 4 6% 6% 3 4 4 3 6% 43%	2098
	21st to end	Night	19% 8% 3 5% 5% 2 4 5% 5% 6% 40%	1776
March	1st to 10th	Night	16% 8% 3 5% 4 3 4 4 5% 6% 43%	2160
	11th to 20th	Night	18% 8% 2 6% 4 3 4 4 5% 6% 40%	2010
	21st to end	Night	18% 8% 3 7% 6% 3 5% 4 6% 7% 35%	2036
April	1st to 10th	Night	10% 5% 2 4 4 3 5% 4 5% 8% 49%	1800
	11th to 20th	Night	14% 5% 3 6% 4 3 5% 5% 6% 7% 44%	1775
	21st to end	Night	19% 7% 3 5% 5% 2 5% 4 5% 7% 40%	1800
May	1st to 10th	Night	15% 5% 3 5% 5% 3 4 4 5% 8% 45%	1746
	11th to 20th	Night	14% 6% 3 5% 5% 3 3 4 5% 7% 43%	1549
	21st to end	Night	8% 4 2 7% 6% 4 5% 6% 7% 10% 41%	1551
June	1st to 10th	Night	9% 4 2 5% 6% 4 5% 5% 5% 10% 46%	1440
	11th to 20th	Night	4 2 2 4 4 3 4 5% 6% 10% 56%	1440
	21st to end	Night	4 1 1 3 4 2 5% 6% 7% 12% 55%	1440
July	1st to 10th	Night	5% 3 2 4 4 3 5% 5% 6% 9% 52%	1440
	11th to 20th	Night	5% 3 1 4 5% 2 5% 6% 5% 11% 53%	1440
	21st to end	Night	5% 4 2 5% 4 2 4 6% 7% 10% 51%	1709
August	1st to 10th	Night	6% 4 1 4 5% 3 5% 6% 6% 10% 51%	1695
	11th to 20th	Night	6% 4 3 4 5% 3 4 4 5% 9% 53%	1776
	21st to end	Night	5% 4 2 4 4 3 4 5% 5% 9% 54%	1980
September	1st to 10th	Night	10% 5% 2 5% 5% 3 4 4 4 7% 53%	1800
	11th to 20th	Night	8% 5% 2 4 5% 3 4 4 5% 7% 54%	1836
	21st to end	Night	9% 4 2 4 5% 3 4 3 5% 6% 57%	1980
October	1st to 10th	Night	6% 4 1 4 4 2 4 4 4 6% 60%	2099
	11th to 20th	Night	12% 5% 2 5% 4 3 3 3 4 5% 55%	2160
	21st to end	Night	18% 7% 2 4 4 3 3 3 4 5% 48%	2402
November	1st to 10th	Night	10% 5% 2 3 4 2 2 3 5% 6% 59%	2406
	11th to 20th	Night	12% 6% 3 4 5% 2 3 3 3 6% 53%	2470
	21st to end	Night	18% 6% 3 5% 4 2 3 3 4 5% 48%	2470
December	1st to 10th	Night	17% 8% 3 5% 4 3 3 5% 5% 7% 41%	2615
	11th to 20th	Night	15% 6% 3 5% 6% 3 4 4 4 6% 43%	3279
	21st to end	Night	16% 12% 4 7% 6% 3 5% 4 4 5% 33%	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	48% 2 9% 24% 14% 4	1518
	11th to 20th	Day	48% 3 9% 26% 12% 1	1650
	21st to end	Day	46% 3 11% 25% 13% 2	1836
February	1st to 10th	Day	49% 2 10% 23% 14% 1	1678
	11th to 20th	Day	47% 4 11% 21% 13% 5%	1758
	21st to end	Day	49% 3 9% 22% 12% 5%	1480
March	1st to 10th	Day	44% 3 7% 25% 16% 4	1800
	11th to 20th	Day	51% 4 11% 18% 13% 3	1965
	21st to end	Day	52% 4 12% 20% 11% 1	2318
April	1st to 10th	Day	36% 4 11% 29% 19% 2	2160
	11th to 20th	Day	45% 2 11% 21% 17% 4	2134
	21st to end	Day	45% 3 11% 25% 14% 1	2160
May	1st to 10th	Day	45% 4 13% 25% 11% 1	2214
	11th to 20th	Day	42% 3 15% 23% 15% 2	2346
	21st to end	Day	41% 6% 16% 23% 12% 2	2725
June	1st to 10th	Day	34% 4 15% 27% 19% 1	2520
	11th to 20th	Day	29% 5% 11% 31% 22% 3	2520
	21st to end	Day	28% 5% 16% 28% 18% 5%	2520
July	1st to 10th	Day	35% 6% 15% 24% 15% 5%	2451
	11th to 20th	Day	28% 5% 16% 30% 17% 4	2445
	21st to end	Day	33% 6% 13% 32% 14% 2	2459
August	1st to 10th	Day	34% 6% 15% 28% 15% 1	2229
	11th to 20th	Day	37% 5% 14% 29% 14% 1	2125
	21st to end	Day	31% 5% 15% 25% 19% 5%	2376
September	1st to 10th	Day	35% 4 10% 29% 17% 4	2160
	11th to 20th	Day	34% 4 9% 25% 26% 2	2105
	21st to end	Day	30% 3 7% 29% 27% 3	1980
October	1st to 10th	Day	27% 4 10% 27% 28% 5%	1857
	11th to 20th	Day	35% 3 6% 27% 22% 7%	1800
	21st to end	Day	41% 3 6% 27% 19% 5%	1953
November	1st to 10th	Day	32% 3 9% 28% 21% 6%	1672
	11th to 20th	Day	40% 2 6% 24% 22% 5%	1710
	21st to end	Day	44% 2 7% 25% 19% 2	1710
December	1st to 10th	Day	44% 2 10% 26% 15% 2	1562
	11th to 20th	Day	48% 3 8% 24% 16% 2	1915
	21st to end	Day	56% 2 11% 17% 11% 2	2783
January	1st to 10th	Night	43% 3 9% 26% 17% 2	2648
	11th to 20th	Night	49% 3 8% 25% 14% 1	2527
	21st to end	Night	45% 2 10% 26% 15% 2	2665
February	1st to 10th	Night	51% 2 8% 22% 14% 2	2281
	11th to 20th	Night	45% 3 9% 22% 18% 3	2099
	21st to end	Night	47% 3 9% 22% 15% 4	1776
March	1st to 10th	Night	43% 3 9% 20% 19% 6%	2160
	11th to 20th	Night	46% 4 12% 21% 14% 3	2010
	21st to end	Night	50% 3 12% 24% 11% 1	2036
April	1st to 10th	Night	34% 4 11% 29% 20% 4	1800
	11th to 20th	Night	39% 4 9% 23% 20% 4	1775
	21st to end	Night	45% 3 8% 26% 15% 3	1800
May	1st to 10th	Night	40% 4 13% 27% 15% 2	1746
	11th to 20th	Night	42% 4 12% 21% 18% 2	1550
	21st to end	Night	38% 5% 15% 23% 16% 3	1552
June	1st to 10th	Night	34% 3 14% 26% 20% 3	1440
	11th to 20th	Night	24% 4 12% 30% 24% 6%	1440
	21st to end	Night	21% 5% 17% 31% 18% 8%	1440
July	1st to 10th	Night	28% 5% 18% 29% 15% 5%	1400
	11th to 20th	Night	28% 4 15% 30% 18% 6%	1392
	21st to end	Night	26% 5% 17% 34% 17% 1	1614
August	1st to 10th	Night	28% 5% 18% 32% 16% 2	1685
	11th to 20th	Night	30% 3 13% 29% 22% 3	1776
	21st to end	Night	28% 3 14% 28% 21% 5%	1980
September	1st to 10th	Night	33% 4 7% 31% 19% 7%	1800
	11th to 20th	Night	30% 4 8% 28% 25% 4	1836
	21st to end	Night	29% 3 9% 23% 29% 6%	1980
October	1st to 10th	Night	26% 2 10% 26% 30% 6%	2099
	11th to 20th	Night	33% 3 6% 25% 26% 7%	2160
	21st to end	Night	41% 2 7% 24% 20% 6%	2402
November	1st to 10th	Night	29% 2 9% 28% 25% 6%	2406
	11th to 20th	Night	35% 2 7% 25% 24% 7%	2470
	21st to end	Night	42% 2 7% 25% 22% 2	2470
December	1st to 10th	Night	44% 2 12% 24% 16% 2	2615
	11th to 20th	Night	44% 3 8% 25% 19% 2	3281
	21st to end	Night	55% 3 8% 19% 13% 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	25% 10% 30% 27% 7% 1	270
	11th to 20th	Day	24% 13% 39% 19% 4 1	270
	21st to end	Day	19% 14% 38% 24% 5%	282
February	1st to 10th	Day	24% 10% 43% 17% 6%	240
	11th to 20th	Day	25% 18% 34% 18% 5%	240
	21st to end	Day	30% 10% 38% 17% 5% 1	198
March	1st to 10th	Day	18% 14% 36% 23% 8%	240
	11th to 20th	Day	27% 12% 36% 18% 6% 1	240
	21st to end	Day	25% 9% 33% 25% 8%	404
April	1st to 10th	Day	12% 12% 37% 28% 10% 1	420
	11th to 20th	Day	21% 13% 28% 22% 15% 2	412
	21st to end	Day	20% 10% 28% 29% 11% 2	420
May	1st to 10th	Day	17% 9% 31% 27% 13% 3	423
	11th to 20th	Day	19% 4 25% 26% 17% 9%	488
	21st to end	Day	11% 4 20% 34% 22% 9%	679
June	1st to 10th	Day	11% 3 16% 24% 28% 18%	630
	11th to 20th	Day	5% 1 15% 35% 30% 13%	630
	21st to end	Day	5% 2 21% 34% 26% 12%	630
July	1st to 10th	Day	10% 2 8% 25% 29% 26%	621
	11th to 20th	Day	7% 1 10% 31% 33% 18%	618
	21st to end	Day	6% 2 11% 30% 35% 16%	684
August	1st to 10th	Day	9% 1 8% 29% 35% 18%	541
	11th to 20th	Day	16% 1 9% 24% 34% 15%	439
	21st to end	Day	11% 1 5% 23% 38% 22%	495
September	1st to 10th	Day	12% 2 7% 27% 34% 19%	450
	11th to 20th	Day	7% 2 8% 26% 37% 19%	450
	21st to end	Day	12% 5% 13% 29% 27% 13%	450
October	1st to 10th	Day	10% 4 18% 37% 22% 9%	327
	11th to 20th	Day	17% 10% 33% 25% 14% 2	270
	21st to end	Day	25% 11% 28% 25% 11% 1	297
November	1st to 10th	Day	14% 8% 26% 33% 13% 6%	270
	11th to 20th	Day	12% 12% 35% 24% 16% 1	270
	21st to end	Day	23% 10% 30% 24% 11% 1	270
December	1st to 10th	Day	16% 10% 33% 27% 11% 3	270
	11th to 20th	Day	23% 10% 34% 24% 10%	270
	21st to end	Day	23% 11% 41% 18% 7%	297
January	1st to 10th	Night	22% 11% 34% 27% 5%	950
	11th to 20th	Night	23% 13% 38% 22% 4	950
	21st to end	Night	20% 9% 38% 29% 2	1025
February	1st to 10th	Night	24% 13% 34% 25% 4	841
	11th to 20th	Night	22% 15% 34% 26% 3	703
	21st to end	Night	25% 11% 36% 24% 3	592
March	1st to 10th	Night	23% 12% 33% 27% 5%	720
	11th to 20th	Night	22% 8% 32% 30% 7%	570
	21st to end	Night	23% 7% 31% 30% 8%	594
April	1st to 10th	Night	13% 10% 37% 32% 9%	540
	11th to 20th	Night	17% 8% 29% 32% 13% 1	533
	21st to end	Night	22% 4 30% 32% 10% 1	540
May	1st to 10th	Night	16% 4 27% 39% 12% 2	540
	11th to 20th	Night	17% 3 21% 37% 21% 1	531
	21st to end	Night	8% 3 15% 43% 27% 4	584
June	1st to 10th	Night	12% 3 11% 37% 34% 4	540
	11th to 20th	Night	5% 1 9% 49% 34% 2	540
	21st to end	Night	5% 1 13% 44% 35% 2	540
July	1st to 10th	Night	9% 1 6% 33% 42% 10%	525
	11th to 20th	Night	7% 2 8% 35% 43% 7%	522
	21st to end	Night	7% 1 8% 35% 43% 6%	591
August	1st to 10th	Night	7% 1 4 40% 41% 7%	537
	11th to 20th	Night	9% 1 7% 37% 41% 5%	534
	21st to end	Night	8% 1 6% 31% 46% 8%	594
September	1st to 10th	Night	11% 2 8% 35% 38% 6%	540
	11th to 20th	Night	10% 1 10% 32% 39% 8%	576
	21st to end	Night	11% 3 15% 37% 31% 5%	720
October	1st to 10th	Night	8% 2 19% 39% 27% 4	720
	11th to 20th	Night	16% 4 28% 33% 17% 1	720
	21st to end	Night	23% 5% 26% 33% 12% 1	792
November	1st to 10th	Night	14% 5% 29% 38% 14% 1	740
	11th to 20th	Night	18% 6% 33% 32% 11%	760
	21st to end	Night	22% 8% 29% 30% 10%	760
December	1st to 10th	Night	22% 9% 30% 31% 7% 1	905
	11th to 20th	Night	23% 7% 30% 33% 7% 1	950
	21st to end	Night	25% 9% 33% 29% 4	1045

Page generated at 2024-01-24 08:37:27. Version ac07

Copyright 2024 Attilla Danko