RabbitEye Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the RabbitEye Observatory clear sky chart from 2005-11-06 to 2024-12-24.

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	11% 6% 2 7% 5% 5% 5% 4 7% 8% 38%	101496
	Night	11% 6% 2 6% 4 4 5% 4 6% 8% 43%	98569
Transparency	Day	39% 9% 13% 17% 16% 7%	105238
	Night	37% 8% 13% 17% 17% 8%	102966
Seeing	Day	13% 9% 25% 25% 19% 9%	15508
	Night	12% 8% 24% 33% 20% 3	25590

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	11% 6% 2 6% 4 4 4 5% 5% 7% 46%	2836
	11th to 20th	Day	13% 7% 3 5% 3 4 4 3 5% 7% 46%	2840
	21st to end	Day	12% 7% 2 7% 4 4 4 3 5% 6% 45%	3124
February	1st to 10th	Day	15% 7% 3 6% 5% 4 4 4 4 7% 40%	1857
	11th to 20th	Day	16% 6% 2 5% 3 3 3 3 4 5% 49%	1848
	21st to end	Day	14% 7% 3 6% 4 3 4 3 5% 6% 46%	1612
March	1st to 10th	Day	18% 10% 3 7% 5% 4 4 3 5% 6% 36%	3435
	11th to 20th	Day	7% 4 1 5% 4 4 4 4 5% 7% 52%	3480
	21st to end	Day	17% 6% 3 6% 4 4 4 3 5% 6% 43%	3815
April	1st to 10th	Day	9% 6% 2 5% 5% 5% 4 4 5% 7% 49%	2090
	11th to 20th	Day	11% 6% 2 6% 5% 4 4 3 5% 8% 46%	2145
	21st to end	Day	6% 4 2 4 4 4 4 4 6% 8% 53%	2390
May	1st to 10th	Day	6% 5% 2 7% 5% 6% 5% 4 7% 8% 45%	4082
	11th to 20th	Day	12% 7% 3 7% 5% 6% 5% 4 6% 8% 37%	4081
	21st to end	Day	6% 3 1 6% 5% 5% 6% 5% 7% 10% 46%	4476
June	1st to 10th	Day	10% 7% 3 8% 7% 7% 7% 6% 7% 10% 30%	2470
	11th to 20th	Day	6% 5% 2 7% 6% 7% 6% 7% 9% 12% 33%	2470
	21st to end	Day	7% 6% 3 8% 7% 8% 8% 6% 10% 11% 27%	2470
July	1st to 10th	Day	9% 8% 3 10% 7% 8% 8% 7% 10% 11% 19%	4120
	11th to 20th	Day	5% 5% 2 8% 8% 7% 9% 8% 10% 14% 25%	4120
	21st to end	Day	6% 6% 3 9% 9% 9% 8% 7% 10% 12% 21%	4466
August	1st to 10th	Day	17% 6% 3 9% 6% 7% 7% 6% 8% 11% 22%	4104
	11th to 20th	Day	6% 5% 2 7% 6% 7% 7% 6% 9% 12% 32%	4044
	21st to end	Day	10% 6% 3 8% 7% 8% 8% 6% 9% 11% 25%	3940
September	1st to 10th	Day	12% 7% 3 9% 7% 7% 7% 5% 8% 8% 28%	2090
	11th to 20th	Day	12% 8% 2 9% 7% 5% 6% 5% 7% 9% 30%	2090
	21st to end	Day	12% 7% 3 7% 5% 6% 5% 4 6% 7% 37%	2090
October	1st to 10th	Day	14% 6% 3 5% 5% 5% 5% 4 5% 6% 43%	2048
	11th to 20th	Day	9% 5% 2 5% 3 3 3 3 5% 7% 56%	1900
	21st to end	Day	8% 5% 2 5% 4 3 4 3 5% 6% 54%	2090
November	1st to 10th	Day	11% 5% 2 5% 5% 3 4 3 5% 7% 51%	1957
	11th to 20th	Day	12% 6% 2 5% 4 3 3 3 4 6% 53%	1922
	21st to end	Day	12% 6% 2 6% 4 4 4 3 5% 6% 48%	1800
December	1st to 10th	Day	11% 7% 2 7% 4 4 4 3 5% 7% 45%	1800
	11th to 20th	Day	16% 7% 2 5% 3 3 3 3 4 6% 48%	2243
	21st to end	Day	16% 10% 3 6% 4 4 4 3 5% 5% 42%	3151
January	1st to 10th	Night	14% 7% 3 6% 4 4 5% 4 6% 7% 42%	4109
	11th to 20th	Night	9% 7% 3 6% 4 4 4 5% 6% 8% 44%	4120
	21st to end	Night	14% 8% 2 6% 4 4 4 3 5% 8% 42%	4532
February	1st to 10th	Night	14% 7% 3 7% 5% 4 4 4 5% 6% 43%	2318
	11th to 20th	Night	15% 8% 2 6% 3 5% 3 3 4 6% 46%	2218
	21st to end	Night	12% 6% 2 6% 4 4 4 4 5% 6% 47%	1841
March	1st to 10th	Night	21% 11% 3 7% 4 3 3 3 4 6% 36%	3418
	11th to 20th	Night	9% 5% 2 6% 3 4 4 4 5% 8% 50%	3480
	21st to end	Night	12% 7% 2 6% 4 4 4 4 5% 7% 46%	3817
April	1st to 10th	Night	9% 4 1 5% 4 4 5% 4 7% 6% 50%	2090
	11th to 20th	Night	8% 5% 2 5% 4 3 4 3 6% 8% 50%	1982
	21st to end	Night	6% 5% 2 4 4 3 4 4 6% 8% 55%	1804
May	1st to 10th	Night	5% 4 2 6% 4 4 5% 4 7% 9% 51%	2813
	11th to 20th	Night	11% 6% 3 6% 4 4 5% 4 6% 9% 42%	2812
	21st to end	Night	7% 4 2 5% 4 4 4 4 5% 9% 52%	3079
June	1st to 10th	Night	8% 6% 2 6% 5% 5% 6% 6% 9% 13% 33%	1710
	11th to 20th	Night	6% 6% 2 6% 4 5% 7% 5% 8% 12% 40%	1710
	21st to end	Night	5% 5% 2 7% 5% 5% 7% 7% 10% 13% 32%	1710
July	1st to 10th	Night	9% 8% 3 9% 7% 6% 6% 5% 8% 12% 28%	2840
	11th to 20th	Night	4 6% 3 8% 8% 8% 8% 7% 10% 13% 27%	2840
	21st to end	Night	6% 7% 3 9% 7% 6% 8% 7% 11% 12% 25%	3087
August	1st to 10th	Night	15% 4 3 7% 5% 6% 6% 6% 9% 14% 26%	2825
	11th to 20th	Night	5% 4 2 6% 4 5% 6% 6% 9% 12% 40%	2785
	21st to end	Night	9% 5% 2 7% 5% 5% 6% 4 7% 11% 38%	3676
September	1st to 10th	Night	10% 6% 3 6% 5% 5% 6% 5% 7% 12% 34%	2090
	11th to 20th	Night	11% 7% 2 8% 5% 6% 6% 4 7% 9% 36%	2090
	21st to end	Night	12% 6% 3 7% 5% 4 5% 4 6% 7% 41%	2090
October	1st to 10th	Night	11% 7% 2 6% 3 4 4 3 5% 7% 48%	2130
	11th to 20th	Night	9% 5% 2 5% 3 4 3 3 5% 5% 58%	2280
	21st to end	Night	7% 5% 2 5% 4 4 4 3 4 6% 54%	2508
November	1st to 10th	Night	12% 5% 2 5% 4 3 4 3 5% 5% 51%	2341
	11th to 20th	Night	12% 7% 2 5% 4 3 3 3 4 6% 51%	2474
	21st to end	Night	12% 6% 2 5% 4 4 4 3 6% 7% 48%	2600
December	1st to 10th	Night	11% 6% 2 6% 4 4 5% 3 5% 8% 45%	2600
	11th to 20th	Night	16% 7% 2 5% 4 3 3 3 4 5% 48%	3172
	21st to end	Night	16% 9% 2 7% 5% 4 4 3 5% 6% 39%	4578

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	35% 5% 9% 18% 20% 12%	2837
	11th to 20th	Day	37% 4 8% 17% 23% 12%	2840
	21st to end	Day	39% 7% 8% 13% 22% 12%	3124
February	1st to 10th	Day	43% 5% 9% 16% 18% 9%	1857
	11th to 20th	Day	38% 4 7% 15% 26% 10%	1858
	21st to end	Day	39% 4 8% 16% 20% 12%	1612
March	1st to 10th	Day	48% 5% 8% 18% 13% 7%	3435
	11th to 20th	Day	29% 7% 12% 18% 19% 16%	3480
	21st to end	Day	42% 5% 9% 18% 18% 9%	3815
April	1st to 10th	Day	34% 6% 8% 21% 19% 11%	2090
	11th to 20th	Day	36% 6% 10% 18% 19% 12%	2145
	21st to end	Day	27% 6% 12% 23% 24% 8%	2390
May	1st to 10th	Day	32% 9% 13% 26% 16% 4	4120
	11th to 20th	Day	43% 8% 11% 21% 16% 2	4085
	21st to end	Day	29% 10% 16% 24% 20% 1	4489
June	1st to 10th	Day	45% 12% 14% 18% 12% 1	2470
	11th to 20th	Day	37% 14% 16% 22% 11%	2470
	21st to end	Day	45% 13% 19% 14% 8% 1	2470
July	1st to 10th	Day	51% 17% 18% 11% 3 1	4055
	11th to 20th	Day	42% 19% 26% 10% 2	4051
	21st to end	Day	48% 20% 20% 10% 2	4324
August	1st to 10th	Day	52% 14% 22% 11% 2	4091
	11th to 20th	Day	37% 13% 19% 21% 9%	4083
	21st to end	Day	46% 14% 17% 19% 3	3940
September	1st to 10th	Day	50% 12% 13% 13% 10% 2	2090
	11th to 20th	Day	48% 10% 13% 15% 11% 3	2090
	21st to end	Day	43% 9% 10% 17% 17% 3	2090
October	1st to 10th	Day	46% 5% 8% 9% 17% 14%	3399
	11th to 20th	Day	18% 3 5% 14% 30% 31%	3140
	21st to end	Day	22% 4 6% 18% 34% 15%	3428
November	1st to 10th	Day	33% 4 10% 16% 22% 14%	1957
	11th to 20th	Day	33% 5% 8% 18% 24% 13%	1922
	21st to end	Day	36% 5% 9% 19% 21% 10%	1800
December	1st to 10th	Day	39% 6% 10% 18% 18% 9%	1800
	11th to 20th	Day	38% 5% 8% 19% 24% 7%	2240
	21st to end	Day	44% 5% 6% 18% 21% 5%	3151
January	1st to 10th	Night	40% 5% 7% 13% 22% 13%	4109
	11th to 20th	Night	36% 6% 7% 14% 27% 10%	4120
	21st to end	Night	41% 6% 9% 11% 22% 11%	4532
February	1st to 10th	Night	42% 5% 9% 16% 19% 10%	2318
	11th to 20th	Night	41% 5% 7% 15% 19% 13%	2219
	21st to end	Night	37% 4 10% 19% 15% 15%	1841
March	1st to 10th	Night	49% 6% 11% 14% 13% 8%	3418
	11th to 20th	Night	32% 5% 11% 18% 20% 15%	3480
	21st to end	Night	38% 6% 10% 16% 21% 10%	3817
April	1st to 10th	Night	31% 8% 12% 18% 18% 12%	2090
	11th to 20th	Night	31% 6% 9% 23% 19% 11%	1982
	21st to end	Night	25% 6% 12% 26% 23% 7%	1804
May	1st to 10th	Night	27% 11% 14% 28% 15% 5%	2840
	11th to 20th	Night	37% 9% 14% 23% 15% 2	2813
	21st to end	Night	27% 9% 14% 30% 19% 2	3087
June	1st to 10th	Night	37% 13% 20% 20% 10% 1	1710
	11th to 20th	Night	32% 14% 21% 24% 9%	1710
	21st to end	Night	35% 16% 25% 15% 7% 1	1710
July	1st to 10th	Night	46% 14% 21% 16% 2 1	2795
	11th to 20th	Night	42% 17% 28% 10% 2	2786
	21st to end	Night	45% 21% 19% 13% 2	2988
August	1st to 10th	Night	44% 15% 28% 12% 2	2814
	11th to 20th	Night	30% 14% 23% 27% 7%	2812
	21st to end	Night	38% 11% 21% 28% 2	3676
September	1st to 10th	Night	41% 13% 20% 15% 10% 2	2090
	11th to 20th	Night	42% 11% 18% 16% 11% 2	2090
	21st to end	Night	39% 9% 12% 19% 17% 3	2090
October	1st to 10th	Night	39% 6% 11% 12% 19% 12%	3559
	11th to 20th	Night	18% 3 5% 13% 29% 32%	3779
	21st to end	Night	22% 4 7% 16% 34% 17%	4120
November	1st to 10th	Night	35% 5% 8% 15% 24% 13%	2341
	11th to 20th	Night	35% 5% 8% 16% 24% 12%	2474
	21st to end	Night	35% 5% 10% 19% 20% 11%	2600
December	1st to 10th	Night	36% 7% 14% 17% 20% 6%	2600
	11th to 20th	Night	39% 5% 7% 15% 25% 9%	3174
	21st to end	Night	46% 5% 9% 16% 20% 4	4578

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	16% 24% 43% 16% 1 1	270
	11th to 20th	Day	14% 19% 40% 17% 8% 3	270
	21st to end	Day	28% 24% 35% 11% 2	297
February	1st to 10th	Day	21% 22% 35% 18% 4	270
	11th to 20th	Day	26% 19% 38% 14% 2	270
	21st to end	Day	18% 18% 44% 17% 3	267
March	1st to 10th	Day	17% 17% 33% 20% 13%	460
	11th to 20th	Day	15% 17% 38% 19% 10% 1	460
	21st to end	Day	16% 18% 34% 21% 9% 1	506
April	1st to 10th	Day	18% 17% 32% 22% 10% 2	460
	11th to 20th	Day	13% 17% 30% 25% 11% 5%	452
	21st to end	Day	9% 11% 32% 26% 16% 6%	460
May	1st to 10th	Day	8% 13% 31% 25% 15% 8%	463
	11th to 20th	Day	9% 5% 28% 30% 17% 10%	487
	21st to end	Day	9% 5% 20% 28% 26% 13%	529
June	1st to 10th	Day	11% 3 20% 28% 27% 12%	490
	11th to 20th	Day	9% 4 17% 28% 21% 21%	490
	21st to end	Day	9% 2 13% 31% 28% 17%	490
July	1st to 10th	Day	6% 2 10% 24% 34% 23%	485
	11th to 20th	Day	8% 1 6% 22% 36% 27%	484
	21st to end	Day	8% 2 10% 30% 35% 16%	532
August	1st to 10th	Day	12% 3 12% 24% 30% 19%	486
	11th to 20th	Day	6% 2 8% 24% 36% 25%	479
	21st to end	Day	14% 1 12% 27% 26% 20%	539
September	1st to 10th	Day	13% 3 14% 26% 27% 16%	490
	11th to 20th	Day	15% 4 20% 29% 24% 8%	490
	21st to end	Day	14% 3 14% 29% 28% 11%	490
October	1st to 10th	Day	16% 6% 30% 26% 18% 6%	490
	11th to 20th	Day	9% 7% 29% 30% 18% 8%	490
	21st to end	Day	12% 7% 27% 31% 20% 3	539
November	1st to 10th	Day	16% 8% 30% 26% 15% 4	495
	11th to 20th	Day	17% 14% 35% 23% 8% 3	422
	21st to end	Day	14% 16% 36% 26% 7% 1	300
December	1st to 10th	Day	15% 18% 40% 18% 8% 1	300
	11th to 20th	Day	22% 15% 39% 19% 6%	300
	21st to end	Day	22% 12% 37% 23% 6% 1	306
January	1st to 10th	Night	17% 15% 33% 28% 6%	760
	11th to 20th	Night	14% 14% 30% 33% 9% 1	760
	21st to end	Night	19% 15% 37% 23% 5%	836
February	1st to 10th	Night	18% 13% 34% 28% 7%	760
	11th to 20th	Night	20% 13% 33% 30% 4	743
	21st to end	Night	14% 13% 40% 29% 4	628
March	1st to 10th	Night	13% 14% 33% 34% 6%	760
	11th to 20th	Night	14% 12% 38% 27% 9%	760
	21st to end	Night	11% 14% 36% 30% 8%	836
April	1st to 10th	Night	12% 11% 36% 33% 8%	760
	11th to 20th	Night	11% 11% 32% 34% 11% 1	751
	21st to end	Night	7% 7% 31% 40% 14%	664
May	1st to 10th	Night	7% 7% 23% 46% 16% 1	570
	11th to 20th	Night	9% 3 24% 39% 22% 3	561
	21st to end	Night	11% 2 14% 38% 31% 4	617
June	1st to 10th	Night	9% 1 15% 41% 30% 3	570
	11th to 20th	Night	8% 2 13% 38% 31% 9%	570
	21st to end	Night	6% 1 12% 41% 32% 8%	570
July	1st to 10th	Night	7% 1 10% 32% 40% 9%	555
	11th to 20th	Night	6% 2 6% 28% 47% 12%	552
	21st to end	Night	4 1 9% 36% 42% 7%	624
August	1st to 10th	Night	7% 1 10% 32% 40% 10%	567
	11th to 20th	Night	7% 1 7% 27% 46% 13%	564
	21st to end	Night	13% 2 11% 29% 35% 11%	785
September	1st to 10th	Night	10% 3 11% 27% 42% 7%	760
	11th to 20th	Night	13% 2 15% 36% 30% 4	760
	21st to end	Night	15% 2 14% 33% 32% 4	760
October	1st to 10th	Night	13% 5% 23% 30% 24% 4	760
	11th to 20th	Night	11% 6% 23% 35% 23% 3	760
	21st to end	Night	10% 7% 23% 34% 24% 1	836
November	1st to 10th	Night	15% 7% 22% 37% 18% 1	780
	11th to 20th	Night	16% 11% 27% 30% 14% 1	800
	21st to end	Night	13% 11% 32% 28% 15%	800
December	1st to 10th	Night	13% 10% 31% 33% 12% 1	800
	11th to 20th	Night	17% 11% 30% 31% 11% 1	800
	21st to end	Night	18% 12% 30% 31% 10%	851

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