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 2025-02-06.

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 5% 7% 44%	108416
	Night	13% 7% 2 6% 4 4 4 3 5% 6% 46%	110027
Transparency	Day	38% 4 11% 26% 18% 3	112062
	Night	38% 3 10% 25% 20% 4	114522
Seeing	Day	14% 7% 23% 27% 20% 9%	15807
	Night	17% 6% 25% 33% 17% 2	25750

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	15% 9% 4 9% 4 4 4 3 4 5% 39%	3617
	11th to 20th	Day	11% 6% 3 7% 5% 4 4 3 4 7% 47%	3939
	21st to end	Day	18% 9% 3 6% 4 3 3 3 5% 5% 41%	4488
February	1st to 10th	Day	15% 12% 3 7% 4 3 4 3 4 6% 39%	1816
	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	4 3 1 4 4 4 5% 4 6% 10% 55%	3949
	11th to 20th	Day	11% 5% 2 6% 4 4 4 4 6% 8% 45%	3729
	21st to end	Day	6% 4 2 4 3 3 4 3 5% 9% 56%	4180
September	1st to 10th	Day	10% 5% 2 5% 4 4 4 3 6% 7% 49%	2280
	11th to 20th	Day	10% 6% 2 5% 4 4 4 3 6% 7% 49%	2221
	21st to end	Day	11% 6% 2 4 4 2 3 4 5% 7% 52%	2090
October	1st to 10th	Day	8% 4 2 4 2 3 3 4 5% 6% 60%	1960
	11th to 20th	Day	12% 6% 2 5% 3 3 4 3 4 6% 53%	1900
	21st to end	Day	17% 7% 2 5% 3 3 3 3 5% 5% 47%	2061
November	1st to 10th	Day	11% 5% 2 5% 4 2 4 3 5% 6% 54%	1762
	11th to 20th	Day	12% 8% 2 6% 4 4 3 3 4 6% 49%	1800
	21st to end	Day	17% 8% 3 5% 4 3 4 3 5% 5% 43%	1800
December	1st to 10th	Day	10% 9% 2 5% 3 4 4 3 5% 5% 51%	2678
	11th to 20th	Day	14% 9% 3 7% 5% 4 3 3 4 5% 43%	3008
	21st to end	Day	23% 15% 4 8% 4 4 3 2 4 4 28%	3982
January	1st to 10th	Night	16% 10% 3 8% 4 4 4 3 5% 6% 37%	6348
	11th to 20th	Night	13% 8% 3 8% 5% 5% 4 3 5% 5% 41%	6038
	21st to end	Night	19% 8% 2 6% 3 3 4 3 5% 5% 42%	6490
February	1st to 10th	Night	17% 12% 4 7% 5% 4 3 3 4 6% 36%	2474
	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	4 2 1 4 3 3 4 3 6% 8% 62%	2985
	11th to 20th	Night	8% 5% 2 6% 4 4 4 3 5% 8% 51%	3100
	21st to end	Night	3 4 2 4 3 3 4 4 5% 8% 60%	3476
September	1st to 10th	Night	10% 5% 2 5% 4 4 3 3 4 6% 53%	1900
	11th to 20th	Night	8% 5% 2 5% 4 4 3 3 5% 7% 53%	1938
	21st to end	Night	10% 4 1 5% 4 4 3 3 5% 6% 54%	2090
October	1st to 10th	Night	6% 4 1 5% 3 3 3 3 4 6% 62%	2216
	11th to 20th	Night	11% 5% 2 5% 3 4 3 3 4 4 56%	2280
	21st to end	Night	17% 7% 2 5% 3 3 3 2 4 5% 49%	2536
November	1st to 10th	Night	11% 5% 2 4 3 2 2 2 5% 6% 57%	2536
	11th to 20th	Night	12% 6% 2 5% 4 3 3 2 3 7% 52%	2600
	21st to end	Night	18% 7% 3 5% 4 3 2 2 4 5% 48%	2600
December	1st to 10th	Night	15% 8% 2 6% 3 3 3 3 4 5% 48%	4507
	11th to 20th	Night	15% 8% 2 6% 4 4 4 3 4 6% 45%	5199
	21st to end	Night	23% 12% 3 7% 4 4 4 3 4 4 31%	6996

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% 3 10% 24% 12% 2	3618
	11th to 20th	Day	39% 3 8% 28% 19% 4	3939
	21st to end	Day	46% 3 9% 17% 16% 8%	4488
February	1st to 10th	Day	48% 2 11% 24% 14% 1	1816
	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	24% 6% 14% 32% 23% 1	3935
	11th to 20th	Day	36% 4 12% 28% 18% 2	3765
	21st to end	Day	25% 4 13% 37% 18% 3	4179
September	1st to 10th	Day	34% 4 10% 28% 19% 5%	2280
	11th to 20th	Day	35% 4 9% 25% 26% 2	2221
	21st to end	Day	31% 4 8% 28% 27% 3	2090
October	1st to 10th	Day	15% 2 6% 21% 46% 11%	3259
	11th to 20th	Day	23% 2 5% 23% 37% 10%	3140
	21st to end	Day	31% 3 5% 28% 28% 5%	3375
November	1st to 10th	Day	33% 4 9% 27% 20% 6%	1762
	11th to 20th	Day	39% 2 6% 25% 22% 6%	1800
	21st to end	Day	44% 2 7% 26% 19% 2	1800
December	1st to 10th	Day	36% 2 8% 36% 16% 1	2678
	11th to 20th	Day	45% 3 8% 27% 15% 2	3005
	21st to end	Day	62% 2 11% 15% 8% 2	3982
January	1st to 10th	Night	50% 3 8% 26% 12% 1	6348
	11th to 20th	Night	44% 4 6% 25% 18% 3	6038
	21st to end	Night	45% 2 8% 23% 18% 3	6490
February	1st to 10th	Night	51% 2 9% 22% 14% 2	2474
	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	19% 4 19% 35% 21% 1	2975
	11th to 20th	Night	31% 4 15% 26% 18% 5%	3130
	21st to end	Night	22% 4 10% 38% 22% 3	3476
September	1st to 10th	Night	33% 4 7% 30% 20% 7%	1900
	11th to 20th	Night	31% 4 8% 27% 25% 4	1938
	21st to end	Night	31% 4 9% 22% 28% 6%	2090
October	1st to 10th	Night	15% 1 6% 18% 44% 16%	3697
	11th to 20th	Night	23% 2 4 19% 42% 10%	3779
	21st to end	Night	30% 2 6% 26% 29% 8%	4172
November	1st to 10th	Night	30% 2 9% 28% 25% 6%	2536
	11th to 20th	Night	35% 2 7% 25% 24% 7%	2600
	21st to end	Night	42% 2 7% 26% 22% 2	2600
December	1st to 10th	Night	40% 3 9% 29% 18% 1	4507
	11th to 20th	Night	42% 3 11% 22% 20% 1	5201
	21st to end	Night	57% 3 10% 19% 10% 1	6996

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% 11% 31% 27% 6% 1	300
	11th to 20th	Day	22% 14% 41% 19% 3 1	300
	21st to end	Day	17% 13% 40% 25% 5%	330
February	1st to 10th	Day	22% 11% 41% 20% 6%	285
	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%	539
September	1st to 10th	Day	11% 2 8% 28% 33% 18%	490
	11th to 20th	Day	9% 2 9% 26% 36% 18%	490
	21st to end	Day	14% 6% 14% 28% 26% 12%	490
October	1st to 10th	Day	9% 4 18% 36% 22% 11%	360
	11th to 20th	Day	15% 9% 32% 25% 14% 4	300
	21st to end	Day	24% 11% 28% 25% 11% 1	330
November	1st to 10th	Day	14% 10% 26% 32% 12% 5%	300
	11th to 20th	Day	12% 13% 36% 23% 15% 1	300
	21st to end	Day	23% 11% 31% 23% 11% 1	300
December	1st to 10th	Day	16% 12% 34% 25% 10% 3	300
	11th to 20th	Day	22% 12% 33% 24% 9%	300
	21st to end	Day	25% 12% 39% 18% 6%	330
January	1st to 10th	Night	22% 12% 34% 28% 5%	1000
	11th to 20th	Night	23% 13% 39% 22% 4	1000
	21st to end	Night	20% 9% 40% 29% 2	1100
February	1st to 10th	Night	23% 12% 34% 26% 4	914
	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% 32% 47% 8%	627
September	1st to 10th	Night	11% 3 8% 34% 37% 6%	570
	11th to 20th	Night	11% 1 10% 33% 38% 8%	608
	21st to end	Night	13% 3 15% 36% 30% 4	760
October	1st to 10th	Night	8% 2 19% 39% 27% 4	760
	11th to 20th	Night	15% 5% 28% 32% 19% 1	760
	21st to end	Night	23% 5% 27% 33% 12%	836
November	1st to 10th	Night	14% 5% 29% 38% 14% 1	780
	11th to 20th	Night	18% 6% 32% 32% 11%	800
	21st to end	Night	22% 8% 30% 30% 10%	800
December	1st to 10th	Night	22% 9% 31% 31% 6% 1	953
	11th to 20th	Night	23% 7% 31% 33% 7% 1	1000
	21st to end	Night	26% 9% 33% 28% 4	1100

Page generated at 2025-02-03 02:05:55. Version ac07

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