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 2024-08-30.

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% 7% 2 6% 4 4 4 4 6% 7% 43%	95648
	Night	13% 7% 2 6% 4 4 4 3 5% 7% 45%	93449
Transparency	Day	40% 4 11% 26% 17% 3	95406
	Night	40% 3 10% 26% 18% 4	93298
Seeing	Day	14% 6% 22% 27% 21% 9%	15293
	Night	17% 6% 25% 33% 17% 2	25067

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	14% 10% 3 8% 4 3 3 3 5% 6% 41%	2527
	11th to 20th	Day	15% 8% 3 6% 4 3 3 3 4 6% 44%	2751
	21st to end	Day	23% 12% 3 6% 4 3 3 3 4 4 35%	3135
February	1st to 10th	Day	15% 12% 3 7% 5% 3 4 3 4 6% 38%	1771
	11th to 20th	Day	15% 9% 3 7% 5% 4 3 3 5% 6% 39%	1848
	21st to end	Day	15% 11% 3 6% 5% 4 4 3 6% 5% 38%	1570
March	1st to 10th	Day	19% 12% 3 7% 4 4 4 3 3 5% 37%	3120
	11th to 20th	Day	12% 7% 2 5% 3 3 3 3 4 5% 51%	3465
	21st to end	Day	14% 8% 2 7% 4 3 4 3 6% 7% 40%	4065
April	1st to 10th	Day	11% 6% 2 5% 4 4 5% 4 6% 7% 46%	2280
	11th to 20th	Day	15% 8% 3 6% 4 3 4 4 4 6% 42%	2254
	21st to end	Day	16% 7% 3 6% 5% 4 4 5% 5% 7% 39%	2280
May	1st to 10th	Day	12% 6% 2 7% 5% 6% 6% 5% 8% 10% 34%	3861
	11th to 20th	Day	17% 7% 3 6% 4 4 4 4 5% 8% 39%	4164
	21st to end	Day	10% 6% 2 7% 5% 5% 5% 4 6% 8% 42%	4824
June	1st to 10th	Day	9% 4 2 5% 5% 5% 5% 4 6% 10% 45%	2660
	11th to 20th	Day	4 4 2 5% 4 5% 5% 4 6% 9% 51%	2660
	21st to end	Day	5% 4 1 4 4 5% 5% 4 8% 12% 47%	2660
July	1st to 10th	Day	9% 5% 2 6% 5% 4 5% 4 8% 9% 43%	4440
	11th to 20th	Day	5% 2 1 4 4 4 5% 5% 7% 11% 51%	4440
	21st to end	Day	7% 7% 3 8% 6% 6% 6% 6% 7% 9% 35%	4565
August	1st to 10th	Day	6% 4 2 6% 5% 5% 5% 5% 7% 11% 44%	2368
	11th to 20th	Day	10% 5% 2 6% 5% 5% 5% 5% 7% 10% 41%	2245
	21st to end	Day	7% 5% 2 5% 4 4 5% 4 6% 11% 48%	2485
September	1st to 10th	Day	10% 6% 2 5% 4 4 4 3 6% 7% 48%	2160
	11th to 20th	Day	9% 5% 2 5% 4 4 4 3 6% 7% 49%	2105
	21st to end	Day	10% 5% 2 4 4 2 3 4 5% 7% 54%	1980
October	1st to 10th	Day	9% 4 2 4 2 3 4 4 5% 6% 58%	1857
	11th to 20th	Day	13% 6% 2 5% 3 3 4 3 5% 6% 51%	1800
	21st to end	Day	17% 7% 2 5% 3 3 3 3 5% 5% 46%	1953
November	1st to 10th	Day	10% 5% 2 5% 4 3 4 3 4 6% 55%	1672
	11th to 20th	Day	12% 8% 2 6% 4 4 3 3 3 6% 48%	1710
	21st to end	Day	17% 8% 3 5% 4 3 4 3 5% 5% 43%	1710
December	1st to 10th	Day	14% 9% 3 6% 4 4 4 3 6% 6% 42%	1562
	11th to 20th	Day	15% 9% 3 8% 5% 5% 4 4 4 5% 39%	1918
	21st to end	Day	18% 14% 4 8% 4 4 4 3 4 5% 31%	2783
January	1st to 10th	Night	16% 8% 2 6% 5% 4 4 3 5% 7% 42%	4428
	11th to 20th	Night	14% 9% 3 8% 5% 5% 5% 3 5% 6% 36%	4216
	21st to end	Night	24% 10% 3 7% 3 3 4 3 5% 5% 35%	4532
February	1st to 10th	Night	17% 12% 4 7% 5% 4 3 3 4 6% 36%	2408
	11th to 20th	Night	15% 8% 4 7% 5% 3 3 3 4 6% 43%	2218
	21st to end	Night	18% 8% 2 6% 4 3 4 4 5% 5% 40%	1884
March	1st to 10th	Night	20% 9% 3 7% 4 4 4 2 4 4 39%	3733
	11th to 20th	Night	12% 6% 1 5% 3 4 5% 4 5% 6% 49%	3524
	21st to end	Night	13% 6% 2 7% 5% 4 4 4 6% 7% 41%	3564
April	1st to 10th	Night	9% 6% 2 5% 4 3 5% 4 5% 8% 48%	1900
	11th to 20th	Night	14% 5% 2 6% 4 4 5% 4 6% 6% 44%	1875
	21st to end	Night	19% 7% 2 6% 4 3 5% 3 5% 7% 39%	1900
May	1st to 10th	Night	17% 6% 2 5% 4 4 4 3 6% 8% 40%	3034
	11th to 20th	Night	15% 7% 3 6% 4 3 4 3 5% 8% 43%	2730
	21st to end	Night	9% 6% 3 7% 5% 6% 5% 4 6% 9% 41%	2743
June	1st to 10th	Night	9% 4 2 6% 5% 5% 4 4 6% 9% 46%	1520
	11th to 20th	Night	4 3 2 4 4 4 4 4 6% 10% 56%	1520
	21st to end	Night	4 2 1 3 4 4 4 5% 7% 11% 55%	1520
July	1st to 10th	Night	9% 4 2 5% 3 4 5% 4 5% 9% 50%	2530
	11th to 20th	Night	6% 3 1 4 5% 3 4 4 5% 9% 57%	2530
	21st to end	Night	7% 7% 3 7% 5% 4 5% 4 7% 9% 41%	2993
August	1st to 10th	Night	5% 4 1 5% 4 4 5% 4 6% 9% 52%	1790
	11th to 20th	Night	7% 4 2 5% 4 4 4 4 5% 8% 53%	1876
	21st to end	Night	5% 5% 2 5% 4 4 4 4 5% 9% 54%	2080
September	1st to 10th	Night	10% 5% 2 5% 4 4 3 3 4 7% 53%	1800
	11th to 20th	Night	8% 5% 2 4 4 4 4 4 5% 7% 54%	1836
	21st to end	Night	9% 4 1 4 4 4 3 3 5% 6% 56%	1980
October	1st to 10th	Night	6% 4 1 5% 4 3 3 3 4 6% 60%	2099
	11th to 20th	Night	12% 5% 2 5% 3 4 3 3 4 4 55%	2160
	21st to end	Night	17% 8% 2 5% 3 3 3 2 4 5% 48%	2402
November	1st to 10th	Night	10% 5% 2 4 3 2 2 2 5% 6% 58%	2406
	11th to 20th	Night	12% 6% 2 5% 4 3 3 2 3 6% 52%	2470
	21st to end	Night	18% 7% 3 5% 4 3 2 2 4 5% 48%	2470
December	1st to 10th	Night	17% 8% 3 6% 3 3 4 4 5% 7% 41%	2615
	11th to 20th	Night	15% 7% 3 6% 5% 4 4 3 4 6% 43%	3279
	21st to end	Night	16% 13% 4 8% 5% 5% 5% 3 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	46% 2 9% 28% 12% 2	2528
	11th to 20th	Day	43% 2 9% 25% 17% 3	2751
	21st to end	Day	54% 3 9% 19% 13% 3	3135
February	1st to 10th	Day	49% 2 10% 23% 14% 1	1771
	11th to 20th	Day	46% 4 10% 21% 14% 5%	1858
	21st to end	Day	48% 3 9% 22% 13% 5%	1570
March	1st to 10th	Day	53% 2 5% 20% 13% 7%	3120
	11th to 20th	Day	37% 2 10% 28% 17% 6%	3465
	21st to end	Day	44% 2 15% 24% 14% 1	4065
April	1st to 10th	Day	37% 4 11% 28% 19% 2	2280
	11th to 20th	Day	44% 2 11% 22% 17% 4	2254
	21st to end	Day	45% 3 11% 25% 14% 1	2280
May	1st to 10th	Day	45% 4 14% 24% 11% 1	3896
	11th to 20th	Day	45% 3 12% 27% 12% 1	4168
	21st to end	Day	40% 4 11% 23% 21% 1	4837
June	1st to 10th	Day	34% 4 15% 26% 19% 2	2660
	11th to 20th	Day	29% 5% 11% 31% 23% 3	2660
	21st to end	Day	28% 5% 17% 27% 18% 5%	2660
July	1st to 10th	Day	36% 5% 13% 27% 16% 3	4371
	11th to 20th	Day	26% 5% 13% 37% 16% 2	4365
	21st to end	Day	42% 8% 14% 27% 9% 1	4421
August	1st to 10th	Day	33% 6% 15% 29% 17% 1	2354
	11th to 20th	Day	37% 5% 14% 29% 15% 2	2245
	21st to end	Day	30% 5% 15% 27% 19% 5%	2485
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	44% 2 8% 31% 13% 1	4428
	11th to 20th	Night	48% 4 8% 25% 13% 2	4216
	21st to end	Night	52% 2 9% 24% 11% 1	4532
February	1st to 10th	Night	51% 2 8% 23% 15% 2	2408
	11th to 20th	Night	44% 3 9% 23% 18% 4	2219
	21st to end	Night	46% 3 9% 21% 17% 4	1884
March	1st to 10th	Night	50% 2 7% 20% 15% 6%	3733
	11th to 20th	Night	37% 3 11% 24% 19% 7%	3524
	21st to end	Night	43% 3 11% 31% 11% 1	3564
April	1st to 10th	Night	34% 4 10% 28% 20% 4	1900
	11th to 20th	Night	39% 4 9% 23% 20% 5%	1875
	21st to end	Night	46% 3 8% 26% 15% 3	1900
May	1st to 10th	Night	42% 4 17% 26% 10% 1	3064
	11th to 20th	Night	42% 4 14% 22% 17% 1	2731
	21st to end	Night	39% 4 12% 25% 18% 2	2751
June	1st to 10th	Night	35% 3 14% 26% 20% 3	1520
	11th to 20th	Night	24% 4 12% 29% 25% 7%	1520
	21st to end	Night	21% 5% 17% 30% 18% 9%	1520
July	1st to 10th	Night	33% 4 13% 29% 16% 4	2490
	11th to 20th	Night	26% 4 11% 37% 18% 4	2482
	21st to end	Night	38% 6% 18% 25% 13% 1	2898
August	1st to 10th	Night	27% 5% 18% 32% 17% 2	1780
	11th to 20th	Night	30% 3 13% 29% 22% 3	1876
	21st to end	Night	27% 4 13% 29% 21% 5%	2080
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	18% 13% 37% 26% 5%	297
February	1st to 10th	Day	23% 10% 40% 19% 7%	270
	11th to 20th	Day	24% 17% 34% 20% 5%	270
	21st to end	Day	28% 13% 37% 16% 5% 1	225
March	1st to 10th	Day	19% 13% 36% 23% 9%	270
	11th to 20th	Day	24% 11% 41% 17% 5% 1	270
	21st to end	Day	24% 10% 33% 24% 8%	445
April	1st to 10th	Day	14% 12% 36% 27% 10% 1	460
	11th to 20th	Day	20% 15% 29% 21% 14% 2	452
	21st to end	Day	18% 10% 30% 29% 11% 3	460
May	1st to 10th	Day	16% 9% 30% 27% 13% 4	463
	11th to 20th	Day	18% 4 25% 25% 18% 10%	531
	21st to end	Day	11% 4 22% 33% 21% 9%	734
June	1st to 10th	Day	12% 3 17% 25% 27% 17%	680
	11th to 20th	Day	6% 1 14% 36% 30% 13%	680
	21st to end	Day	5% 2 21% 35% 25% 11%	680
July	1st to 10th	Day	10% 2 9% 27% 28% 24%	671
	11th to 20th	Day	7% 1 10% 32% 33% 17%	668
	21st to end	Day	7% 3 11% 31% 34% 15%	739
August	1st to 10th	Day	9% 1 8% 30% 34% 18%	586
	11th to 20th	Day	16% 2 11% 26% 32% 14%	479
	21st to end	Day	10% 1 5% 23% 39% 22%	532
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% 39% 30% 2	1045
February	1st to 10th	Night	23% 13% 34% 26% 4	888
	11th to 20th	Night	21% 15% 35% 27% 3	743
	21st to end	Night	24% 12% 38% 23% 3	628
March	1st to 10th	Night	23% 12% 33% 27% 5%	760
	11th to 20th	Night	21% 8% 32% 31% 7%	601
	21st to end	Night	22% 8% 30% 31% 8%	627
April	1st to 10th	Night	13% 10% 37% 32% 8%	570
	11th to 20th	Night	18% 9% 29% 31% 12% 1	563
	21st to end	Night	22% 4 31% 32% 10% 1	570
May	1st to 10th	Night	16% 4 27% 40% 12% 2	570
	11th to 20th	Night	17% 3 20% 38% 21% 1	561
	21st to end	Night	8% 3 15% 44% 26% 4	617
June	1st to 10th	Night	12% 3 12% 38% 32% 4	570
	11th to 20th	Night	5% 1 9% 50% 33% 2	570
	21st to end	Night	5% 1 14% 44% 34% 2	570
July	1st to 10th	Night	9% 1 7% 33% 41% 10%	555
	11th to 20th	Night	6% 1 8% 36% 41% 7%	552
	21st to end	Night	8% 1 8% 35% 42% 6%	624
August	1st to 10th	Night	7% 1 5% 39% 41% 6%	567
	11th to 20th	Night	9% 1 7% 38% 40% 5%	564
	21st to end	Night	7% 1 6% 31% 47% 8%	624
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 2024-08-27 08:49:37. Version ac07

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