Bushels and Baskets Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Bushels and Baskets Observatory clear sky chart from 2005-11-06 to 2025-01-07.

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% 10% 4 8% 5% 4 4 4 6% 7% 34%	104921
	Night	15% 11% 4 8% 5% 4 4 3 5% 6% 35%	104149
Transparency	Day	46% 6% 12% 21% 13% 1	108563
	Night	47% 6% 11% 21% 13% 2	108647
Seeing	Day	17% 10% 27% 24% 16% 7%	15774
	Night	19% 10% 29% 28% 13% 1	25665

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% 18% 9% 12% 5% 5% 4 3 5% 5% 20%	2575
	11th to 20th	Day	16% 15% 9% 13% 6% 6% 7% 7% 4 3 14%	2530
	21st to end	Day	28% 22% 10% 10% 4 3 2 2 3 3 13%	2996
February	1st to 10th	Day	17% 16% 6% 12% 6% 6% 4 3 4 5% 22%	1819
	11th to 20th	Day	15% 11% 5% 13% 8% 4 3 3 5% 6% 26%	1848
	21st to end	Day	15% 15% 7% 10% 6% 4 3 3 4 5% 27%	1570
March	1st to 10th	Day	21% 19% 5% 9% 5% 3 3 2 4 5% 24%	3120
	11th to 20th	Day	13% 10% 4 7% 6% 4 4 4 5% 7% 39%	3436
	21st to end	Day	17% 11% 6% 10% 5% 4 4 4 5% 6% 27%	3872
April	1st to 10th	Day	15% 13% 3 8% 6% 4 5% 4 5% 7% 31%	2280
	11th to 20th	Day	17% 10% 2 7% 5% 4 4 3 6% 7% 36%	2290
	21st to end	Day	19% 8% 3 8% 5% 4 5% 3 6% 8% 32%	2470
May	1st to 10th	Day	19% 9% 3 8% 6% 5% 5% 4 6% 7% 28%	4082
	11th to 20th	Day	19% 6% 2 6% 4 4 4 4 6% 8% 37%	4081
	21st to end	Day	9% 6% 2 6% 6% 5% 5% 5% 8% 10% 38%	4499
June	1st to 10th	Day	10% 6% 3 7% 5% 5% 5% 5% 5% 9% 40%	2660
	11th to 20th	Day	9% 5% 2 6% 5% 5% 5% 4 7% 9% 42%	2660
	21st to end	Day	10% 5% 2 7% 5% 5% 5% 4 6% 10% 39%	2660
July	1st to 10th	Day	12% 6% 3 8% 5% 5% 5% 5% 7% 10% 35%	4440
	11th to 20th	Day	6% 4 2 5% 4 5% 5% 4 7% 11% 46%	4440
	21st to end	Day	7% 7% 3 8% 5% 6% 5% 5% 7% 9% 38%	4599
August	1st to 10th	Day	7% 5% 2 6% 4 5% 5% 5% 7% 11% 44%	4104
	11th to 20th	Day	8% 5% 2 6% 4 5% 5% 4 8% 9% 43%	4028
	21st to end	Day	7% 5% 2 6% 4 4 4 4 6% 9% 49%	4180
September	1st to 10th	Day	11% 7% 2 6% 4 4 3 4 6% 7% 47%	2209
	11th to 20th	Day	8% 5% 2 6% 4 4 5% 4 7% 8% 47%	2090
	21st to end	Day	15% 7% 3 6% 4 4 4 3 5% 6% 44%	2090
October	1st to 10th	Day	11% 6% 2 8% 5% 4 4 4 4 7% 45%	2090
	11th to 20th	Day	15% 7% 2 5% 4 5% 5% 3 5% 7% 43%	1934
	21st to end	Day	18% 9% 3 9% 5% 4 5% 3 5% 8% 31%	1881
November	1st to 10th	Day	10% 6% 3 6% 4 4 4 2 5% 7% 50%	1762
	11th to 20th	Day	17% 13% 4 8% 5% 4 4 3 4 6% 32%	1800
	21st to end	Day	19% 13% 5% 10% 5% 4 3 3 4 6% 29%	1800
December	1st to 10th	Day	12% 15% 4 9% 5% 4 3 3 4 6% 35%	2930
	11th to 20th	Day	15% 17% 6% 12% 5% 5% 4 4 4 5% 23%	3114
	21st to end	Day	25% 18% 8% 12% 5% 5% 4 3 4 5% 12%	3982
January	1st to 10th	Night	16% 17% 8% 13% 6% 4 3 3 4 5% 22%	4513
	11th to 20th	Night	13% 21% 8% 15% 6% 5% 5% 4 4 4 15%	4440
	21st to end	Night	26% 19% 8% 9% 4 4 3 2 3 4 18%	4661
February	1st to 10th	Night	19% 15% 5% 9% 6% 5% 4 3 4 5% 25%	2359
	11th to 20th	Night	12% 13% 5% 10% 7% 5% 4 3 5% 5% 31%	2218
	21st to end	Night	19% 13% 4 10% 5% 5% 4 4 5% 5% 27%	1884
March	1st to 10th	Night	19% 13% 4 6% 4 4 3 3 4 5% 34%	3733
	11th to 20th	Night	11% 8% 2 6% 4 4 4 4 6% 7% 44%	3522
	21st to end	Night	18% 9% 4 8% 5% 4 3 3 5% 6% 35%	3788
April	1st to 10th	Night	15% 9% 3 7% 5% 4 4 4 6% 7% 35%	1900
	11th to 20th	Night	17% 8% 2 6% 6% 4 4 4 6% 7% 37%	1838
	21st to end	Night	18% 10% 3 7% 4 4 4 3 6% 6% 36%	1710
May	1st to 10th	Night	17% 11% 4 8% 5% 5% 4 4 6% 7% 30%	2813
	11th to 20th	Night	19% 7% 2 5% 4 4 4 3 5% 8% 38%	2812
	21st to end	Night	10% 5% 2 6% 5% 5% 6% 4 6% 10% 42%	3052
June	1st to 10th	Night	8% 5% 3 6% 4 4 4 3 5% 9% 48%	1520
	11th to 20th	Night	8% 6% 2 6% 4 3 5% 4 6% 10% 48%	1520
	21st to end	Night	9% 5% 2 5% 5% 4 4 4 7% 9% 46%	1520
July	1st to 10th	Night	9% 4 2 6% 4 4 5% 4 6% 8% 48%	2530
	11th to 20th	Night	6% 3 2 4 3 3 4 4 6% 9% 55%	2530
	21st to end	Night	10% 7% 2 7% 4 4 5% 4 6% 10% 41%	2955
August	1st to 10th	Night	10% 6% 2 6% 4 4 4 4 5% 9% 45%	2825
	11th to 20th	Night	7% 5% 3 5% 5% 5% 5% 4 6% 8% 48%	2785
	21st to end	Night	6% 4 2 6% 4 4 5% 4 6% 8% 51%	3476
September	1st to 10th	Night	12% 4 2 5% 4 3 4 4 5% 6% 51%	1950
	11th to 20th	Night	8% 5% 2 4 4 3 3 4 6% 8% 55%	2090
	21st to end	Night	12% 5% 2 4 4 4 4 3 5% 6% 49%	2090
October	1st to 10th	Night	10% 6% 2 5% 3 3 3 3 5% 7% 52%	2090
	11th to 20th	Night	17% 9% 3 5% 4 4 3 3 4 5% 44%	2241
	21st to end	Night	19% 7% 2 6% 5% 4 4 4 5% 6% 38%	2717
November	1st to 10th	Night	12% 9% 2 6% 4 3 3 3 5% 6% 46%	2536
	11th to 20th	Night	15% 11% 4 8% 5% 4 4 3 5% 7% 35%	2600
	21st to end	Night	17% 14% 5% 9% 6% 4 5% 3 5% 5% 28%	2600
December	1st to 10th	Night	13% 11% 4 8% 6% 4 5% 3 6% 7% 32%	4250
	11th to 20th	Night	18% 16% 9% 12% 4 4 4 3 5% 4 21%	5085
	21st to end	Night	24% 19% 7% 11% 5% 5% 4 3 4 5% 13%	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	66% 5% 8% 15% 6%	2576
	11th to 20th	Day	73% 5% 9% 8% 5%	2530
	21st to end	Day	78% 3 6% 10% 3	2996
February	1st to 10th	Day	65% 4 10% 13% 8% 1	1819
	11th to 20th	Day	59% 5% 10% 19% 6% 1	1858
	21st to end	Day	59% 5% 12% 17% 6% 2	1570
March	1st to 10th	Day	63% 4 8% 17% 7%	3120
	11th to 20th	Day	44% 5% 10% 30% 10% 1	3436
	21st to end	Day	56% 7% 16% 17% 4	3872
April	1st to 10th	Day	52% 7% 12% 18% 11%	2280
	11th to 20th	Day	48% 6% 11% 21% 11% 3	2290
	21st to end	Day	49% 6% 12% 19% 11% 3	2470
May	1st to 10th	Day	52% 8% 11% 19% 8%	4120
	11th to 20th	Day	44% 8% 15% 24% 9% 1	4085
	21st to end	Day	36% 9% 14% 21% 18% 2	4512
June	1st to 10th	Day	40% 8% 12% 23% 15% 2	2660
	11th to 20th	Day	35% 9% 12% 24% 17% 2	2660
	21st to end	Day	38% 10% 15% 20% 14% 4	2660
July	1st to 10th	Day	42% 8% 13% 20% 16% 2	4371
	11th to 20th	Day	29% 8% 14% 28% 20% 1	4365
	21st to end	Day	38% 10% 15% 17% 17% 3	4453
August	1st to 10th	Day	32% 8% 19% 26% 14% 1	4091
	11th to 20th	Day	34% 8% 13% 30% 15% 1	4067
	21st to end	Day	30% 7% 14% 29% 17% 3	4179
September	1st to 10th	Day	35% 7% 14% 22% 19% 4	2209
	11th to 20th	Day	32% 7% 13% 24% 21% 3	2090
	21st to end	Day	40% 5% 10% 23% 20% 1	2090
October	1st to 10th	Day	26% 5% 11% 31% 25% 2	3480
	11th to 20th	Day	33% 5% 12% 24% 25% 1	3188
	21st to end	Day	42% 4 10% 25% 17% 2	3081
November	1st to 10th	Day	34% 5% 15% 27% 18% 1	1762
	11th to 20th	Day	53% 5% 10% 19% 11% 2	1800
	21st to end	Day	57% 5% 11% 19% 7% 1	1800
December	1st to 10th	Day	51% 4 14% 23% 8%	2930
	11th to 20th	Day	63% 5% 12% 16% 4	3111
	21st to end	Day	76% 5% 8% 8% 4	3982
January	1st to 10th	Night	66% 5% 9% 13% 7%	4513
	11th to 20th	Night	74% 4 7% 11% 4	4440
	21st to end	Night	71% 4 8% 13% 4	4661
February	1st to 10th	Night	61% 5% 12% 14% 7% 1	2359
	11th to 20th	Night	56% 4 11% 18% 10% 1	2219
	21st to end	Night	58% 6% 9% 15% 9% 2	1884
March	1st to 10th	Night	53% 5% 9% 23% 10% 1	3733
	11th to 20th	Night	37% 7% 12% 26% 15% 2	3522
	21st to end	Night	49% 6% 12% 26% 7% 1	3788
April	1st to 10th	Night	46% 6% 13% 20% 14% 1	1900
	11th to 20th	Night	45% 6% 11% 18% 16% 4	1838
	21st to end	Night	46% 7% 10% 21% 12% 4	1710
May	1st to 10th	Night	51% 8% 10% 20% 9% 2	2840
	11th to 20th	Night	43% 8% 13% 26% 9% 1	2813
	21st to end	Night	33% 10% 16% 22% 15% 3	3060
June	1st to 10th	Night	34% 6% 10% 27% 21% 3	1520
	11th to 20th	Night	31% 8% 13% 25% 20% 3	1520
	21st to end	Night	33% 9% 14% 23% 16% 4	1520
July	1st to 10th	Night	34% 8% 11% 26% 16% 5%	2490
	11th to 20th	Night	24% 7% 16% 28% 24% 2	2482
	21st to end	Night	37% 7% 15% 18% 19% 4	2861
August	1st to 10th	Night	35% 7% 13% 29% 14% 1	2814
	11th to 20th	Night	32% 8% 13% 29% 18% 1	2812
	21st to end	Night	29% 7% 13% 26% 21% 3	3476
September	1st to 10th	Night	32% 7% 13% 23% 19% 6%	1950
	11th to 20th	Night	27% 6% 10% 28% 27% 3	2090
	21st to end	Night	34% 7% 11% 24% 22% 3	2090
October	1st to 10th	Night	22% 4 8% 30% 34% 2	3480
	11th to 20th	Night	31% 4 12% 23% 29% 1	3726
	21st to end	Night	34% 5% 8% 29% 22% 3	4467
November	1st to 10th	Night	39% 4 10% 26% 18% 2	2536
	11th to 20th	Night	48% 5% 10% 20% 14% 3	2600
	21st to end	Night	58% 5% 11% 20% 7%	2600
December	1st to 10th	Night	50% 5% 13% 24% 7% 1	4250
	11th to 20th	Night	65% 5% 12% 11% 6% 1	5087
	21st to end	Night	74% 5% 9% 9% 3	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	21% 20% 37% 15% 5% 1	288
	11th to 20th	Day	23% 18% 40% 14% 5%	270
	21st to end	Day	32% 15% 32% 16% 5%	297
February	1st to 10th	Day	30% 20% 30% 16% 4	270
	11th to 20th	Day	23% 19% 39% 16% 4	270
	21st to end	Day	28% 18% 39% 12% 2	225
March	1st to 10th	Day	24% 21% 35% 17% 3	270
	11th to 20th	Day	26% 14% 32% 21% 6% 1	429
	21st to end	Day	28% 16% 30% 19% 6%	506
April	1st to 10th	Day	19% 17% 32% 21% 10% 2	460
	11th to 20th	Day	21% 19% 26% 19% 11% 3	452
	21st to end	Day	23% 14% 33% 19% 10% 2	460
May	1st to 10th	Day	23% 13% 30% 24% 6% 4	463
	11th to 20th	Day	21% 6% 27% 26% 13% 6%	487
	21st to end	Day	11% 6% 27% 27% 19% 10%	539
June	1st to 10th	Day	11% 7% 26% 31% 21% 5%	680
	11th to 20th	Day	11% 6% 26% 31% 20% 6%	680
	21st to end	Day	13% 6% 28% 26% 20% 7%	680
July	1st to 10th	Day	11% 3 19% 26% 22% 18%	671
	11th to 20th	Day	5% 3 24% 29% 25% 14%	668
	21st to end	Day	10% 3 15% 32% 28% 12%	613
August	1st to 10th	Day	8% 3 16% 28% 26% 18%	486
	11th to 20th	Day	10% 3 20% 29% 25% 13%	479
	21st to end	Day	9% 3 15% 27% 32% 15%	539
September	1st to 10th	Day	13% 4 15% 26% 30% 12%	490
	11th to 20th	Day	10% 2 14% 24% 31% 18%	490
	21st to end	Day	18% 10% 21% 22% 21% 8%	490
October	1st to 10th	Day	10% 7% 26% 31% 18% 9%	490
	11th to 20th	Day	16% 16% 30% 24% 12% 2	472
	21st to end	Day	26% 14% 37% 19% 3 1	330
November	1st to 10th	Day	12% 14% 35% 25% 11% 4	300
	11th to 20th	Day	24% 18% 29% 19% 8% 1	300
	21st to end	Day	29% 12% 39% 17% 3	300
December	1st to 10th	Day	17% 23% 36% 16% 7% 1	300
	11th to 20th	Day	25% 14% 40% 15% 6%	300
	21st to end	Day	28% 21% 30% 17% 3	330
January	1st to 10th	Night	23% 17% 36% 20% 4	981
	11th to 20th	Night	26% 15% 37% 19% 4	950
	21st to end	Night	23% 16% 35% 22% 4	913
February	1st to 10th	Night	28% 11% 35% 23% 4	760
	11th to 20th	Night	19% 15% 40% 24% 2	743
	21st to end	Night	25% 13% 39% 20% 3	628
March	1st to 10th	Night	22% 13% 33% 26% 6%	760
	11th to 20th	Night	18% 13% 38% 24% 6% 1	760
	21st to end	Night	24% 12% 31% 27% 5%	819
April	1st to 10th	Night	19% 12% 35% 27% 6% 1	570
	11th to 20th	Night	21% 12% 30% 28% 9% 1	563
	21st to end	Night	21% 9% 37% 22% 9% 1	570
May	1st to 10th	Night	22% 8% 31% 31% 8% 1	570
	11th to 20th	Night	22% 5% 26% 29% 16% 2	561
	21st to end	Night	11% 2 24% 39% 21% 2	617
June	1st to 10th	Night	10% 3 26% 43% 18% 1	570
	11th to 20th	Night	9% 4 23% 41% 22%	570
	21st to end	Night	10% 3 25% 36% 26% 1	570
July	1st to 10th	Night	10% 3 15% 36% 31% 5%	555
	11th to 20th	Night	7% 4 15% 39% 30% 4	552
	21st to end	Night	11% 2 11% 44% 30% 2	624
August	1st to 10th	Night	7% 1 14% 42% 31% 5%	567
	11th to 20th	Night	7% 2 13% 43% 30% 6%	564
	21st to end	Night	7% 1 14% 34% 39% 5%	627
September	1st to 10th	Night	14% 3 13% 36% 30% 4	620
	11th to 20th	Night	10% 3 14% 35% 34% 4	760
	21st to end	Night	14% 6% 24% 31% 22% 3	760
October	1st to 10th	Night	12% 5% 26% 34% 19% 4	760
	11th to 20th	Night	21% 13% 27% 26% 12% 1	760
	21st to end	Night	22% 13% 32% 26% 7%	836
November	1st to 10th	Night	17% 9% 36% 24% 12% 1	780
	11th to 20th	Night	19% 16% 34% 24% 7% 1	800
	21st to end	Night	25% 15% 30% 24% 6% 1	800
December	1st to 10th	Night	24% 14% 36% 21% 5%	800
	11th to 20th	Night	25% 14% 33% 22% 5%	925
	21st to end	Night	30% 15% 33% 19% 3	1100

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