Rush Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Rush Lake clear sky chart from 2005-11-06 to 2024-11-25.

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	13% 9% 3 8% 5% 5% 5% 4 5% 7% 37%	102204
	Night	12% 10% 3 8% 5% 4 4 3 5% 6% 38%	97349
Transparency	Day	44% 7% 14% 25% 10% 1	105797
	Night	44% 6% 13% 24% 12% 1	101896
Seeing	Day	16% 9% 29% 27% 14% 4	16123
	Night	16% 8% 31% 33% 11% 1	26027

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	13% 15% 5% 15% 7% 4 4 4 4 5% 24%	2527
	11th to 20th	Day	6% 10% 5% 14% 9% 10% 9% 5% 5% 5% 21%	2530
	21st to end	Day	7% 19% 9% 12% 6% 5% 5% 4 5% 6% 24%	3080
February	1st to 10th	Day	9% 12% 4 11% 6% 4 5% 4 5% 7% 33%	1710
	11th to 20th	Day	7% 12% 4 9% 6% 4 4 4 5% 7% 37%	1664
	21st to end	Day	10% 11% 3 10% 6% 5% 5% 3 6% 6% 34%	1469
March	1st to 10th	Day	10% 11% 3 8% 5% 5% 4 4 5% 6% 38%	3334
	11th to 20th	Day	9% 9% 3 9% 5% 5% 4 4 5% 8% 40%	3480
	21st to end	Day	20% 12% 4 10% 6% 5% 5% 4 5% 5% 25%	3873
April	1st to 10th	Day	17% 10% 4 7% 5% 5% 4 3 5% 6% 34%	2280
	11th to 20th	Day	20% 11% 4 9% 5% 4 4 3 4 5% 32%	2271
	21st to end	Day	22% 9% 3 7% 5% 5% 4 3 4 5% 31%	2470
May	1st to 10th	Day	17% 7% 2 7% 4 4 4 3 5% 6% 40%	4322
	11th to 20th	Day	14% 6% 2 6% 4 4 5% 4 5% 7% 43%	4399
	21st to end	Day	18% 7% 2 7% 5% 5% 5% 4 5% 8% 34%	4824
June	1st to 10th	Day	11% 5% 2 6% 5% 4 4 4 6% 8% 46%	2660
	11th to 20th	Day	12% 7% 3 7% 4 4 5% 4 6% 9% 38%	2718
	21st to end	Day	11% 5% 2 6% 5% 5% 5% 5% 7% 10% 39%	2850
July	1st to 10th	Day	10% 5% 2 6% 5% 5% 5% 5% 8% 10% 39%	4609
	11th to 20th	Day	5% 3 2 4 3 3 4 4 6% 9% 57%	4440
	21st to end	Day	7% 5% 2 5% 4 4 4 4 6% 10% 50%	4813
August	1st to 10th	Day	12% 6% 2 6% 4 4 4 4 6% 8% 44%	4121
	11th to 20th	Day	12% 5% 2 7% 5% 5% 6% 4 5% 9% 41%	4041
	21st to end	Day	12% 7% 2 7% 4 4 4 4 6% 7% 44%	4341
September	1st to 10th	Day	9% 6% 2 5% 5% 4 4 4 6% 8% 47%	2280
	11th to 20th	Day	12% 5% 2 6% 4 5% 4 4 5% 7% 46%	2266
	21st to end	Day	15% 7% 3 5% 4 4 3 3 5% 8% 44%	1990
October	1st to 10th	Day	17% 7% 2 5% 4 3 5% 4 6% 7% 40%	1900
	11th to 20th	Day	16% 11% 3 8% 4 5% 4 3 5% 6% 37%	1900
	21st to end	Day	19% 10% 3 7% 5% 4 3 3 4 6% 36%	2038
November	1st to 10th	Day	13% 12% 4 8% 5% 5% 4 4 5% 6% 34%	1631
	11th to 20th	Day	13% 16% 6% 12% 6% 5% 4 3 4 5% 27%	1600
	21st to end	Day	14% 12% 4 8% 5% 4 4 5% 6% 7% 32%	1552
December	1st to 10th	Day	11% 14% 6% 12% 7% 6% 6% 3 5% 5% 25%	1520
	11th to 20th	Day	12% 15% 6% 10% 6% 5% 5% 3 4 6% 26%	1918
	21st to end	Day	24% 17% 6% 13% 6% 3 3 2 3 4 18%	2783
January	1st to 10th	Night	12% 13% 6% 14% 6% 4 4 3 4 5% 30%	4428
	11th to 20th	Night	6% 11% 5% 14% 8% 7% 9% 5% 7% 5% 22%	4440
	21st to end	Night	9% 22% 7% 11% 5% 4 4 3 4 4 25%	4582
February	1st to 10th	Night	6% 12% 4 9% 6% 5% 5% 3 5% 6% 37%	2470
	11th to 20th	Night	6% 10% 3 10% 6% 6% 5% 3 5% 7% 39%	2403
	21st to end	Night	13% 11% 3 8% 6% 5% 5% 3 5% 7% 35%	1984
March	1st to 10th	Night	8% 8% 3 7% 5% 4 4 3 5% 6% 46%	3550
	11th to 20th	Night	9% 9% 3 9% 6% 5% 5% 4 5% 6% 40%	3480
	21st to end	Night	24% 11% 4 10% 5% 3 3 2 4 4 29%	3757
April	1st to 10th	Night	16% 12% 3 7% 4 4 4 3 5% 5% 36%	1900
	11th to 20th	Night	21% 11% 3 7% 4 3 4 2 4 5% 37%	1856
	21st to end	Night	21% 8% 3 6% 4 4 5% 4 5% 6% 34%	1710
May	1st to 10th	Night	13% 7% 3 8% 6% 4 4 3 4 7% 40%	2583
	11th to 20th	Night	15% 5% 2 4 3 3 4 2 5% 7% 50%	2506
	21st to end	Night	13% 8% 3 7% 4 4 4 3 6% 8% 39%	2743
June	1st to 10th	Night	10% 6% 3 5% 5% 4 4 4 5% 8% 46%	1520
	11th to 20th	Night	10% 5% 2 6% 4 5% 5% 4 6% 8% 45%	1454
	21st to end	Night	8% 5% 2 5% 5% 3 5% 4 6% 8% 48%	1330
July	1st to 10th	Night	10% 4 2 5% 4 5% 4 4 7% 10% 45%	2344
	11th to 20th	Night	4 3 1 4 3 3 4 3 7% 9% 58%	2530
	21st to end	Night	5% 3 2 5% 4 4 4 4 5% 7% 59%	2750
August	1st to 10th	Night	11% 5% 2 6% 3 4 4 3 5% 7% 49%	2803
	11th to 20th	Night	14% 5% 2 5% 3 4 4 4 7% 8% 46%	2798
	21st to end	Night	11% 7% 3 7% 4 4 5% 3 5% 6% 44%	3318
September	1st to 10th	Night	8% 5% 2 5% 3 4 4 4 6% 7% 53%	1900
	11th to 20th	Night	8% 5% 2 5% 4 3 4 4 5% 8% 54%	1909
	21st to end	Night	15% 5% 1 4 3 4 4 4 4 7% 49%	2171
October	1st to 10th	Night	14% 6% 2 5% 4 3 4 3 5% 6% 49%	2280
	11th to 20th	Night	15% 10% 3 6% 5% 4 4 3 5% 6% 40%	2280
	21st to end	Night	18% 10% 4 8% 5% 3 3 3 5% 6% 36%	2560
November	1st to 10th	Night	14% 10% 4 6% 5% 4 5% 3 6% 7% 37%	2664
	11th to 20th	Night	15% 12% 5% 11% 6% 4 4 3 4 5% 32%	2800
	21st to end	Night	13% 10% 4 8% 6% 4 4 4 5% 7% 35%	2723
December	1st to 10th	Night	10% 13% 4 12% 7% 5% 4 4 5% 7% 28%	2660
	11th to 20th	Night	11% 15% 5% 11% 6% 5% 5% 4 5% 6% 26%	3279
	21st to end	Night	23% 18% 5% 9% 5% 4 3 3 3 4 22%	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	61% 7% 11% 17% 4	2528
	11th to 20th	Day	62% 8% 10% 15% 5%	2530
	21st to end	Day	60% 8% 12% 15% 5%	3080
February	1st to 10th	Day	50% 5% 14% 23% 8% 1	1710
	11th to 20th	Day	47% 5% 14% 24% 8% 1	1673
	21st to end	Day	51% 5% 12% 21% 11% 1	1469
March	1st to 10th	Day	45% 7% 15% 23% 10% 1	3334
	11th to 20th	Day	40% 7% 13% 30% 9% 1	3480
	21st to end	Day	59% 7% 9% 19% 5%	3873
April	1st to 10th	Day	51% 5% 12% 19% 13% 1	2280
	11th to 20th	Day	55% 5% 9% 18% 12% 1	2271
	21st to end	Day	54% 6% 11% 19% 9%	2470
May	1st to 10th	Day	42% 7% 13% 24% 13% 1	4362
	11th to 20th	Day	39% 7% 13% 26% 12% 2	4403
	21st to end	Day	46% 9% 13% 23% 9% 1	4837
June	1st to 10th	Day	34% 9% 15% 30% 11% 1	2660
	11th to 20th	Day	41% 7% 15% 23% 13% 1	2718
	21st to end	Day	35% 10% 18% 27% 9% 1	2850
July	1st to 10th	Day	37% 8% 18% 24% 12%	4539
	11th to 20th	Day	23% 6% 17% 36% 16% 1	4365
	21st to end	Day	28% 7% 16% 31% 16% 1	4662
August	1st to 10th	Day	36% 6% 14% 30% 12% 1	4106
	11th to 20th	Day	38% 7% 13% 33% 8%	4080
	21st to end	Day	38% 7% 17% 25% 12% 1	4340
September	1st to 10th	Day	34% 8% 15% 33% 10%	2280
	11th to 20th	Day	36% 8% 18% 30% 8%	2266
	21st to end	Day	39% 7% 13% 31% 9% 1	1990
October	1st to 10th	Day	31% 5% 12% 34% 18%	3160
	11th to 20th	Day	40% 5% 11% 28% 15% 2	3140
	21st to end	Day	47% 3 16% 25% 8%	3340
November	1st to 10th	Day	49% 7% 13% 19% 11% 1	1631
	11th to 20th	Day	59% 6% 12% 16% 7%	1600
	21st to end	Day	50% 7% 17% 19% 5% 2	1552
December	1st to 10th	Day	60% 8% 14% 14% 4	1520
	11th to 20th	Day	58% 7% 15% 15% 4	1915
	21st to end	Day	70% 5% 8% 11% 6%	2783
January	1st to 10th	Night	55% 7% 12% 19% 6% 1	4428
	11th to 20th	Night	59% 9% 12% 14% 5%	4440
	21st to end	Night	62% 6% 10% 18% 5% 1	4582
February	1st to 10th	Night	47% 6% 13% 23% 10% 1	2470
	11th to 20th	Night	44% 8% 14% 24% 9% 2	2404
	21st to end	Night	48% 6% 13% 21% 11% 1	1984
March	1st to 10th	Night	38% 7% 13% 25% 16% 2	3550
	11th to 20th	Night	40% 8% 11% 26% 14%	3480
	21st to end	Night	59% 4 8% 19% 9% 1	3757
April	1st to 10th	Night	48% 6% 9% 20% 16% 1	1900
	11th to 20th	Night	49% 5% 7% 21% 15% 2	1856
	21st to end	Night	48% 8% 9% 20% 13% 2	1710
May	1st to 10th	Night	42% 8% 12% 21% 16% 1	2608
	11th to 20th	Night	33% 6% 12% 27% 19% 3	2507
	21st to end	Night	41% 9% 12% 23% 13% 1	2751
June	1st to 10th	Night	33% 8% 16% 27% 13% 3	1520
	11th to 20th	Night	35% 6% 16% 24% 17% 2	1454
	21st to end	Night	30% 8% 15% 30% 13% 3	1330
July	1st to 10th	Night	32% 8% 21% 24% 14% 1	2305
	11th to 20th	Night	21% 7% 13% 38% 19% 2	2482
	21st to end	Night	24% 7% 15% 33% 19% 2	2662
August	1st to 10th	Night	34% 6% 12% 30% 15% 3	2794
	11th to 20th	Night	34% 7% 14% 32% 12% 1	2825
	21st to end	Night	39% 6% 16% 27% 10% 2	3318
September	1st to 10th	Night	28% 8% 15% 34% 15% 1	1900
	11th to 20th	Night	29% 6% 18% 33% 14%	1909
	21st to end	Night	35% 6% 13% 32% 13% 1	2171
October	1st to 10th	Night	25% 4 7% 36% 24% 4	3800
	11th to 20th	Night	35% 5% 12% 25% 20% 2	3779
	21st to end	Night	45% 5% 13% 25% 12%	4208
November	1st to 10th	Night	45% 7% 13% 23% 11% 1	2664
	11th to 20th	Night	55% 4 13% 18% 10%	2800
	21st to end	Night	48% 7% 17% 21% 6% 1	2723
December	1st to 10th	Night	55% 6% 15% 18% 5%	2660
	11th to 20th	Night	58% 7% 11% 17% 5% 2	3281
	21st to end	Night	65% 5% 11% 15% 5%	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	13% 11% 33% 28% 11% 4	270
	11th to 20th	Day	14% 10% 39% 30% 8%	270
	21st to end	Day	15% 6% 38% 26% 14% 1	297
February	1st to 10th	Day	17% 10% 40% 25% 5% 1	270
	11th to 20th	Day	17% 14% 39% 22% 7% 2	270
	21st to end	Day	18% 10% 40% 28% 3	225
March	1st to 10th	Day	17% 12% 37% 25% 7% 1	270
	11th to 20th	Day	20% 9% 36% 25% 9% 1	270
	21st to end	Day	25% 13% 27% 23% 9% 3	331
April	1st to 10th	Day	22% 17% 31% 23% 7% 1	460
	11th to 20th	Day	26% 12% 28% 23% 10% 1	469
	21st to end	Day	25% 10% 31% 20% 11% 2	650
May	1st to 10th	Day	20% 12% 31% 25% 10% 2	653
	11th to 20th	Day	18% 11% 29% 26% 13% 4	675
	21st to end	Day	20% 9% 24% 27% 16% 4	734
June	1st to 10th	Day	11% 7% 26% 33% 18% 5%	680
	11th to 20th	Day	13% 8% 34% 32% 11% 3	680
	21st to end	Day	13% 7% 27% 30% 17% 6%	680
July	1st to 10th	Day	8% 4 21% 30% 24% 13%	671
	11th to 20th	Day	8% 5% 26% 31% 21% 10%	668
	21st to end	Day	7% 4 23% 35% 22% 9%	739
August	1st to 10th	Day	9% 4 22% 35% 23% 7%	676
	11th to 20th	Day	12% 5% 18% 30% 26% 7%	665
	21st to end	Day	11% 6% 24% 32% 20% 7%	635
September	1st to 10th	Day	12% 6% 26% 32% 19% 4	490
	11th to 20th	Day	11% 6% 28% 29% 22% 5%	476
	21st to end	Day	19% 10% 29% 19% 15% 7%	300
October	1st to 10th	Day	18% 9% 31% 20% 15% 7%	300
	11th to 20th	Day	16% 16% 34% 25% 8% 1	300
	21st to end	Day	23% 15% 35% 18% 7% 1	330
November	1st to 10th	Day	21% 9% 35% 24% 9% 1	300
	11th to 20th	Day	18% 18% 39% 19% 6%	300
	21st to end	Day	20% 14% 39% 21% 6%	282
December	1st to 10th	Day	14% 11% 40% 24% 11%	270
	11th to 20th	Day	20% 15% 35% 25% 5%	270
	21st to end	Day	27% 12% 35% 23% 2 1	297
January	1st to 10th	Night	14% 9% 34% 33% 9% 1	950
	11th to 20th	Night	15% 7% 38% 31% 8% 1	950
	21st to end	Night	18% 9% 36% 29% 8% 1	1045
February	1st to 10th	Night	12% 9% 37% 31% 10%	950
	11th to 20th	Night	10% 9% 43% 29% 8% 1	929
	21st to end	Night	18% 9% 34% 30% 9% 1	728
March	1st to 10th	Night	14% 11% 35% 30% 9% 1	655
	11th to 20th	Night	17% 8% 40% 29% 6%	570
	21st to end	Night	22% 9% 29% 27% 10% 2	627
April	1st to 10th	Night	19% 10% 35% 28% 6%	570
	11th to 20th	Night	25% 9% 29% 28% 8% 1	563
	21st to end	Night	24% 8% 29% 30% 9% 1	570
May	1st to 10th	Night	17% 11% 33% 32% 6% 1	570
	11th to 20th	Night	15% 7% 30% 35% 11% 1	561
	21st to end	Night	13% 7% 26% 38% 15%	617
June	1st to 10th	Night	10% 5% 29% 43% 12% 1	570
	11th to 20th	Night	11% 3 31% 44% 10%	570
	21st to end	Night	10% 5% 23% 44% 18% 1	570
July	1st to 10th	Night	6% 2 20% 44% 26% 1	555
	11th to 20th	Night	8% 2 24% 44% 22% 1	552
	21st to end	Night	4 3 22% 46% 24% 2	624
August	1st to 10th	Night	9% 3 15% 51% 21% 2	567
	11th to 20th	Night	14% 2 18% 36% 27% 3	564
	21st to end	Night	12% 3 21% 38% 24% 2	627
September	1st to 10th	Night	10% 4 22% 42% 19% 3	570
	11th to 20th	Night	9% 4 28% 37% 20% 2	570
	21st to end	Night	16% 7% 32% 28% 16% 2	651
October	1st to 10th	Night	18% 8% 28% 32% 13% 1	760
	11th to 20th	Night	20% 10% 33% 30% 6% 1	760
	21st to end	Night	23% 11% 28% 31% 7%	836
November	1st to 10th	Night	19% 10% 30% 32% 8% 1	908
	11th to 20th	Night	20% 11% 33% 28% 8% 1	1000
	21st to end	Night	18% 12% 35% 26% 8%	973
December	1st to 10th	Night	16% 9% 34% 32% 8% 1	950
	11th to 20th	Night	20% 9% 35% 27% 7% 1	950
	21st to end	Night	25% 9% 34% 26% 6%	1045

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