Teter Retreat and Organic Farm
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Teter Retreat and Organic Farm clear sky chart from 2005-11-06 to 2024-11-04.

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	14% 9% 3 7% 5% 4 4 4 6% 7% 36%	101052
	Night	15% 10% 4 7% 4 4 4 3 5% 6% 37%	97990
Transparency	Day	46% 3 11% 24% 14% 2	104693
	Night	47% 2 10% 24% 15% 2	102489
Seeing	Day	18% 7% 25% 25% 17% 8%	15595
	Night	19% 7% 27% 31% 15% 2	25401

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% 16% 9% 12% 5% 4 4 3 5% 5% 23%	2527
	11th to 20th	Day	16% 15% 8% 12% 5% 6% 7% 7% 6% 4 14%	2530
	21st to end	Day	28% 22% 8% 11% 3 2 3 2 3 4 15%	2908
February	1st to 10th	Day	17% 15% 6% 11% 7% 5% 3 2 4 6% 25%	1879
	11th to 20th	Day	15% 12% 3 11% 7% 5% 4 2 4 5% 31%	1848
	21st to end	Day	16% 14% 5% 10% 5% 3 3 3 5% 5% 30%	1570
March	1st to 10th	Day	20% 19% 5% 8% 4 3 3 3 3 5% 27%	3120
	11th to 20th	Day	13% 8% 3 6% 4 4 4 3 5% 7% 43%	3374
	21st to end	Day	16% 11% 5% 9% 5% 5% 4 4 6% 7% 29%	3963
April	1st to 10th	Day	15% 11% 4 8% 6% 4 5% 3 5% 7% 34%	2280
	11th to 20th	Day	17% 9% 3 6% 4 4 5% 4 5% 7% 36%	2254
	21st to end	Day	20% 8% 3 7% 4 4 4 3 5% 8% 34%	2458
May	1st to 10th	Day	18% 10% 3 7% 5% 5% 5% 5% 6% 8% 29%	4082
	11th to 20th	Day	19% 7% 2 6% 4 4 5% 3 6% 8% 37%	4081
	21st to end	Day	10% 6% 3 6% 5% 5% 5% 5% 7% 9% 39%	4586
June	1st to 10th	Day	10% 5% 3 7% 5% 5% 5% 4 7% 8% 41%	2660
	11th to 20th	Day	9% 5% 2 5% 4 5% 5% 5% 7% 7% 45%	2660
	21st to end	Day	9% 6% 2 7% 5% 5% 5% 4 7% 10% 40%	2660
July	1st to 10th	Day	12% 7% 3 7% 5% 5% 5% 4 7% 10% 34%	4440
	11th to 20th	Day	6% 4 2 6% 4 5% 5% 4 8% 12% 45%	4440
	21st to end	Day	9% 6% 3 7% 5% 5% 6% 5% 8% 9% 37%	4670
August	1st to 10th	Day	8% 5% 2 5% 5% 4 5% 4 6% 10% 45%	4104
	11th to 20th	Day	9% 5% 2 6% 4 5% 5% 4 8% 10% 42%	3902
	21st to end	Day	7% 5% 2 6% 4 4 5% 4 6% 8% 51%	4180
September	1st to 10th	Day	11% 6% 2 6% 4 4 4 4 6% 7% 46%	2242
	11th to 20th	Day	10% 5% 2 6% 4 4 4 4 7% 7% 48%	2090
	21st to end	Day	13% 7% 2 5% 4 4 4 3 5% 6% 46%	2090
October	1st to 10th	Day	12% 6% 2 6% 4 4 4 2 5% 7% 48%	2090
	11th to 20th	Day	14% 5% 2 6% 4 5% 5% 3 6% 7% 43%	1934
	21st to end	Day	19% 8% 4 8% 5% 5% 4 3 6% 6% 34%	1881
November	1st to 10th	Day	10% 7% 1 6% 4 3 4 3 5% 6% 51%	1699
	11th to 20th	Day	16% 12% 3 7% 6% 3 3 3 5% 7% 34%	1710
	21st to end	Day	18% 11% 4 8% 5% 3 4 3 5% 6% 33%	1710
December	1st to 10th	Day	19% 15% 5% 11% 5% 3 3 3 3 5% 27%	1710
	11th to 20th	Day	16% 15% 6% 12% 4 5% 3 3 5% 4 27%	1937
	21st to end	Day	23% 21% 9% 11% 5% 5% 3 2 4 4 13%	2783
January	1st to 10th	Night	17% 16% 8% 12% 5% 4 3 3 4 5% 23%	4428
	11th to 20th	Night	15% 20% 8% 13% 5% 5% 6% 4 4 3 17%	4440
	21st to end	Night	25% 18% 7% 8% 5% 3 3 2 3 4 21%	4752
February	1st to 10th	Night	18% 15% 4 9% 5% 4 3 4 5% 5% 27%	2299
	11th to 20th	Night	15% 12% 5% 11% 4 5% 3 3 5% 6% 32%	2218
	21st to end	Night	19% 10% 6% 11% 5% 4 3 3 5% 5% 30%	1884
March	1st to 10th	Night	19% 13% 3 7% 4 3 4 3 4 5% 35%	3733
	11th to 20th	Night	12% 8% 2 6% 4 4 4 3 5% 6% 46%	3584
	21st to end	Night	18% 9% 3 7% 5% 4 3 3 5% 6% 36%	3695
April	1st to 10th	Night	14% 8% 3 7% 5% 5% 5% 3 7% 6% 39%	1900
	11th to 20th	Night	16% 8% 2 6% 4 4 4 3 6% 8% 39%	1875
	21st to end	Night	18% 7% 3 7% 4 4 4 5% 6% 6% 35%	1720
May	1st to 10th	Night	18% 10% 3 8% 6% 5% 5% 4 5% 8% 28%	2813
	11th to 20th	Night	20% 7% 2 6% 4 3 3 4 6% 8% 39%	2812
	21st to end	Night	10% 5% 2 6% 5% 4 5% 4 7% 9% 43%	2969
June	1st to 10th	Night	8% 6% 2 5% 5% 4 4 3 6% 8% 48%	1520
	11th to 20th	Night	9% 5% 3 6% 4 4 4 4 4 10% 48%	1520
	21st to end	Night	7% 6% 2 6% 5% 4 4 5% 8% 9% 44%	1520
July	1st to 10th	Night	9% 5% 1 6% 5% 5% 5% 4 6% 10% 46%	2530
	11th to 20th	Night	6% 4 1 4 2 3 5% 5% 6% 8% 56%	2530
	21st to end	Night	10% 6% 3 7% 4 5% 4 4 7% 9% 41%	2889
August	1st to 10th	Night	11% 5% 2 5% 3 4 4 4 6% 8% 49%	2825
	11th to 20th	Night	6% 6% 2 7% 5% 5% 5% 4 7% 9% 45%	2910
	21st to end	Night	6% 5% 2 5% 4 4 4 4 5% 8% 53%	3476
September	1st to 10th	Night	11% 6% 2 6% 4 3 4 3 5% 8% 48%	1918
	11th to 20th	Night	7% 4 1 5% 3 4 4 3 6% 7% 56%	2090
	21st to end	Night	12% 6% 2 4 3 4 4 3 6% 6% 50%	2090
October	1st to 10th	Night	8% 4 2 6% 4 4 3 4 5% 6% 54%	2090
	11th to 20th	Night	18% 8% 2 4 4 4 3 3 4 7% 45%	2242
	21st to end	Night	18% 8% 2 6% 4 4 5% 3 5% 6% 39%	2717
November	1st to 10th	Night	12% 8% 2 6% 3 3 4 3 5% 5% 49%	2452
	11th to 20th	Night	15% 9% 4 7% 4 4 4 3 4 7% 39%	2470
	21st to end	Night	18% 12% 4 8% 5% 5% 3 3 4 7% 31%	2470
December	1st to 10th	Night	18% 12% 5% 9% 6% 4 4 3 5% 6% 28%	2470
	11th to 20th	Night	17% 13% 5% 9% 4 4 3 3 4 5% 31%	3255
	21st to end	Night	23% 19% 6% 10% 6% 5% 4 3 4 4 16%	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	65% 1 6% 19% 7%	2528
	11th to 20th	Day	72% 2 10% 11% 6%	2530
	21st to end	Day	76% 2 5% 13% 4 1	2908
February	1st to 10th	Day	63% 2 9% 15% 10% 1	1879
	11th to 20th	Day	57% 2 9% 22% 9% 1	1858
	21st to end	Day	57% 3 9% 22% 7% 2	1570
March	1st to 10th	Day	62% 2 7% 19% 9% 1	3120
	11th to 20th	Day	42% 2 10% 31% 14% 1	3374
	21st to end	Day	55% 2 14% 24% 5%	3963
April	1st to 10th	Day	52% 3 11% 20% 14% 1	2280
	11th to 20th	Day	48% 3 10% 25% 11% 3	2254
	21st to end	Day	50% 3 11% 22% 11% 3	2458
May	1st to 10th	Day	54% 3 12% 24% 7%	4120
	11th to 20th	Day	47% 3 14% 26% 9% 1	4085
	21st to end	Day	40% 3 11% 25% 19% 1	4599
June	1st to 10th	Day	40% 3 13% 25% 16% 3	2660
	11th to 20th	Day	35% 4 12% 26% 21% 2	2660
	21st to end	Day	39% 4 15% 21% 17% 4	2660
July	1st to 10th	Day	45% 3 12% 23% 15% 2	4371
	11th to 20th	Day	30% 4 15% 29% 20% 1	4365
	21st to end	Day	42% 5% 15% 19% 16% 3	4522
August	1st to 10th	Day	33% 4 16% 30% 15% 1	4091
	11th to 20th	Day	35% 3 13% 34% 14% 1	3941
	21st to end	Day	32% 4 12% 32% 17% 4	4179
September	1st to 10th	Day	38% 3 10% 26% 18% 4	2242
	11th to 20th	Day	34% 3 10% 26% 22% 4	2090
	21st to end	Day	39% 3 8% 26% 22% 1	2090
October	1st to 10th	Day	25% 2 9% 33% 30% 2	3480
	11th to 20th	Day	35% 2 9% 26% 26% 1	3189
	21st to end	Day	42% 2 9% 26% 19% 1	3081
November	1st to 10th	Day	34% 3 12% 29% 18% 3	1699
	11th to 20th	Day	51% 2 9% 23% 13% 3	1710
	21st to end	Day	53% 2 10% 24% 9% 2	1710
December	1st to 10th	Day	61% 2 9% 19% 8%	1710
	11th to 20th	Day	61% 2 8% 24% 4 1	1934
	21st to end	Day	76% 2 7% 9% 6%	2783
January	1st to 10th	Night	66% 2 8% 17% 7%	4428
	11th to 20th	Night	73% 1 6% 14% 6%	4440
	21st to end	Night	70% 1 7% 15% 7%	4752
February	1st to 10th	Night	59% 2 11% 17% 9% 1	2299
	11th to 20th	Night	54% 2 10% 21% 13% 1	2219
	21st to end	Night	57% 3 9% 18% 11% 2	1884
March	1st to 10th	Night	53% 2 8% 25% 10% 2	3733
	11th to 20th	Night	40% 2 9% 28% 19% 2	3584
	21st to end	Night	50% 2 11% 28% 7% 1	3695
April	1st to 10th	Night	45% 3 11% 26% 14% 2	1900
	11th to 20th	Night	45% 2 9% 24% 16% 5%	1875
	21st to end	Night	48% 5% 9% 22% 13% 4	1720
May	1st to 10th	Night	56% 3 9% 23% 9% 1	2840
	11th to 20th	Night	45% 2 14% 27% 10% 1	2813
	21st to end	Night	37% 4 13% 26% 18% 3	2977
June	1st to 10th	Night	35% 3 10% 28% 20% 4	1520
	11th to 20th	Night	34% 4 12% 25% 21% 4	1520
	21st to end	Night	34% 5% 15% 26% 16% 4	1520
July	1st to 10th	Night	35% 4 11% 28% 15% 6%	2490
	11th to 20th	Night	25% 3 13% 33% 24% 2	2482
	21st to end	Night	40% 4 14% 23% 16% 4	2797
August	1st to 10th	Night	33% 4 14% 33% 14% 1	2814
	11th to 20th	Night	36% 4 12% 29% 17% 1	2937
	21st to end	Night	30% 3 12% 30% 22% 3	3476
September	1st to 10th	Night	35% 3 11% 24% 21% 6%	1918
	11th to 20th	Night	29% 3 9% 28% 27% 4	2090
	21st to end	Night	35% 3 10% 25% 24% 4	2090
October	1st to 10th	Night	22% 2 6% 31% 38% 2	3480
	11th to 20th	Night	30% 1 9% 25% 33% 1	3726
	21st to end	Night	34% 2 7% 29% 24% 3	4467
November	1st to 10th	Night	38% 3 8% 27% 22% 3	2452
	11th to 20th	Night	46% 2 8% 24% 17% 3	2470
	21st to end	Night	56% 2 9% 24% 9%	2470
December	1st to 10th	Night	58% 2 9% 20% 9% 1	2470
	11th to 20th	Night	57% 2 9% 21% 11% 1	3257
	21st to end	Night	73% 2 9% 11% 6%	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	26% 12% 34% 22% 5% 1	270
	11th to 20th	Day	21% 16% 37% 20% 6% 1	270
	21st to end	Day	33% 12% 28% 21% 6%	297
February	1st to 10th	Day	27% 13% 35% 20% 5%	270
	11th to 20th	Day	22% 15% 38% 18% 7%	270
	21st to end	Day	26% 12% 43% 18% 2	225
March	1st to 10th	Day	24% 17% 35% 20% 3 1	270
	11th to 20th	Day	26% 11% 36% 19% 7% 1	393
	21st to end	Day	31% 10% 30% 19% 8% 1	506
April	1st to 10th	Day	19% 12% 35% 22% 9% 3	460
	11th to 20th	Day	21% 13% 29% 21% 13% 3	452
	21st to end	Day	25% 10% 34% 19% 9% 2	460
May	1st to 10th	Day	23% 8% 31% 23% 12% 3	463
	11th to 20th	Day	24% 5% 23% 26% 15% 7%	487
	21st to end	Day	14% 3 26% 24% 20% 13%	587
June	1st to 10th	Day	11% 5% 25% 30% 22% 7%	680
	11th to 20th	Day	13% 3 20% 35% 20% 9%	680
	21st to end	Day	13% 4 25% 28% 21% 9%	680
July	1st to 10th	Day	13% 1 15% 27% 25% 18%	671
	11th to 20th	Day	8% 2 17% 34% 25% 15%	668
	21st to end	Day	11% 1 13% 30% 31% 14%	658
August	1st to 10th	Day	11% 1 10% 30% 27% 21%	486
	11th to 20th	Day	13% 1 15% 28% 28% 15%	479
	21st to end	Day	9% 1 11% 27% 34% 17%	539
September	1st to 10th	Day	13% 2 13% 27% 33% 12%	490
	11th to 20th	Day	10% 2 13% 24% 33% 19%	490
	21st to end	Day	19% 6% 19% 21% 23% 12%	490
October	1st to 10th	Day	11% 6% 19% 35% 19% 9%	490
	11th to 20th	Day	14% 13% 33% 23% 14% 3	428
	21st to end	Day	28% 8% 38% 21% 5%	330
November	1st to 10th	Day	13% 10% 33% 24% 16% 4	279
	11th to 20th	Day	22% 14% 31% 21% 10% 2	270
	21st to end	Day	26% 10% 34% 23% 6%	270
December	1st to 10th	Day	23% 16% 32% 23% 6% 1	270
	11th to 20th	Day	22% 11% 35% 24% 6% 1	270
	21st to end	Day	31% 11% 32% 21% 5%	297
January	1st to 10th	Night	25% 13% 33% 24% 5%	950
	11th to 20th	Night	26% 11% 36% 22% 4	950
	21st to end	Night	25% 11% 34% 26% 4	965
February	1st to 10th	Night	27% 8% 33% 28% 3	760
	11th to 20th	Night	20% 12% 38% 27% 3	743
	21st to end	Night	24% 10% 40% 22% 3	628
March	1st to 10th	Night	20% 13% 33% 27% 7%	760
	11th to 20th	Night	20% 10% 37% 26% 7% 1	760
	21st to end	Night	25% 8% 32% 29% 5% 1	765
April	1st to 10th	Night	18% 10% 37% 28% 8%	570
	11th to 20th	Night	20% 8% 31% 29% 10% 1	563
	21st to end	Night	22% 6% 39% 25% 8% 1	570
May	1st to 10th	Night	22% 6% 31% 30% 11%	570
	11th to 20th	Night	21% 3 23% 31% 20% 2	561
	21st to end	Night	11% 3 21% 38% 25% 2	617
June	1st to 10th	Night	11% 2 21% 46% 19% 1	570
	11th to 20th	Night	11% 2 19% 43% 22% 3	570
	21st to end	Night	10% 1 22% 39% 27% 2	570
July	1st to 10th	Night	11% 1 9% 39% 33% 7%	555
	11th to 20th	Night	7% 1 13% 40% 33% 5%	552
	21st to end	Night	9% 1 11% 41% 35% 3	624
August	1st to 10th	Night	11% 1 9% 40% 36% 4	567
	11th to 20th	Night	7% 1 11% 43% 32% 6%	564
	21st to end	Night	9% 1 11% 34% 40% 5%	627
September	1st to 10th	Night	13% 1 12% 34% 34% 5%	588
	11th to 20th	Night	10% 1 13% 34% 36% 5%	760
	21st to end	Night	15% 4 18% 35% 26% 3	760
October	1st to 10th	Night	12% 3 22% 38% 21% 4	760
	11th to 20th	Night	22% 7% 28% 29% 14%	760
	21st to end	Night	23% 8% 33% 28% 8%	836
November	1st to 10th	Night	18% 7% 31% 31% 13% 1	755
	11th to 20th	Night	19% 13% 31% 27% 9% 1	760
	21st to end	Night	25% 10% 28% 29% 8% 1	760
December	1st to 10th	Night	26% 9% 34% 25% 5%	760
	11th to 20th	Night	26% 8% 33% 25% 8%	926
	21st to end	Night	31% 11% 30% 22% 5%	1045

Page generated at 2024-11-01 22:47:52. Version ac07

Copyright © 2024 Attilla Danko.