Waseca
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Waseca clear sky chart from 2005-11-06 to 2024-02-10.

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% 4 7% 6% 3 5% 5% 5% 7% 36%	78267
	Night	12% 9% 4 8% 6% 3 4 4 5% 7% 38%	80754
Transparency	Day	48% 6% 13% 22% 10% 1	77972
	Night	47% 5% 12% 22% 12% 1	80569
Seeing	Day	17% 9% 31% 27% 13% 3	14877
	Night	16% 9% 34% 30% 10% 1	24948

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	9% 16% 7% 18% 9% 5% 6% 5% 4 5% 16%	2527
	11th to 20th	Day	7% 13% 5% 10% 10% 6% 9% 7% 9% 8% 16%	2635
	21st to end	Day	9% 18% 9% 15% 11% 3 5% 4 5% 4 18%	3135
February	1st to 10th	Day	8% 10% 6% 11% 11% 5% 6% 6% 6% 7% 24%	1701
	11th to 20th	Day	10% 12% 5% 8% 7% 5% 6% 6% 6% 6% 29%	1574
	21st to end	Day	14% 11% 4 9% 8% 4 5% 5% 5% 6% 29%	1386
March	1st to 10th	Day	15% 11% 5% 9% 7% 4 5% 4 5% 6% 29%	1957
	11th to 20th	Day	15% 9% 5% 8% 6% 3 5% 4 6% 7% 33%	1980
	21st to end	Day	20% 10% 4 7% 6% 4 4 4 5% 6% 29%	2184
April	1st to 10th	Day	18% 11% 4 7% 6% 3 4 5% 6% 6% 31%	2160
	11th to 20th	Day	19% 13% 4 5% 5% 3 3 4 4 6% 33%	2137
	21st to end	Day	22% 11% 4 7% 5% 3 5% 4 5% 5% 29%	2340
May	1st to 10th	Day	17% 8% 3 6% 7% 4 5% 6% 6% 6% 31%	2394
	11th to 20th	Day	17% 7% 3 6% 4 2 4 4 6% 8% 37%	2479
	21st to end	Day	17% 6% 3 6% 5% 3 5% 4 5% 8% 38%	2725
June	1st to 10th	Day	12% 5% 2 5% 4 3 4 5% 5% 8% 47%	2520
	11th to 20th	Day	13% 5% 3 5% 5% 3 5% 4 6% 9% 42%	2520
	21st to end	Day	10% 6% 3 5% 5% 4 5% 5% 7% 9% 42%	2520
July	1st to 10th	Day	6% 3 2 5% 5% 2 5% 5% 6% 10% 50%	2520
	11th to 20th	Day	8% 3 2 5% 4 3 4 5% 6% 8% 52%	2520
	21st to end	Day	7% 3 2 4 5% 3 5% 5% 7% 10% 48%	2656
August	1st to 10th	Day	9% 6% 3 5% 6% 4 5% 5% 7% 9% 42%	2328
	11th to 20th	Day	13% 6% 3 5% 5% 3 4 5% 5% 9% 43%	2301
	21st to end	Day	9% 4 2 5% 4 3 4 4 5% 8% 52%	2460
September	1st to 10th	Day	15% 5% 2 4 4 3 4 4 6% 8% 46%	2160
	11th to 20th	Day	12% 5% 3 4 4 2 4 4 5% 7% 49%	2116
	21st to end	Day	14% 6% 2 5% 5% 3 5% 4 5% 7% 43%	1904
October	1st to 10th	Day	16% 8% 3 6% 5% 3 4 4 4 6% 43%	1800
	11th to 20th	Day	16% 9% 3 5% 5% 2 4 4 4 6% 43%	1800
	21st to end	Day	19% 10% 5% 6% 4 2 3 4 5% 6% 36%	1980
November	1st to 10th	Day	11% 9% 5% 6% 5% 3 3 5% 5% 7% 41%	1587
	11th to 20th	Day	12% 12% 6% 10% 7% 3 4 6% 5% 6% 30%	1520
	21st to end	Day	14% 9% 5% 7% 6% 3 3 4 6% 7% 36%	1520
December	1st to 10th	Day	13% 10% 4 10% 11% 5% 6% 4 4 5% 26%	1520
	11th to 20th	Day	11% 12% 7% 10% 7% 4 5% 6% 5% 6% 28%	1918
	21st to end	Day	19% 15% 7% 17% 7% 3 3 3 4 5% 17%	2783
January	1st to 10th	Night	9% 13% 8% 18% 9% 4 5% 4 5% 4 22%	4428
	11th to 20th	Night	7% 11% 5% 12% 11% 5% 7% 8% 8% 6% 20%	4330
	21st to end	Night	12% 17% 8% 12% 7% 4 4 4 5% 5% 22%	4532
February	1st to 10th	Night	8% 13% 5% 10% 7% 4 6% 4 4 7% 32%	2464
	11th to 20th	Night	8% 10% 4 6% 7% 4 5% 4 5% 7% 38%	2273
	21st to end	Night	13% 9% 4 8% 8% 3 5% 4 5% 5% 35%	1868
March	1st to 10th	Night	13% 10% 3 7% 5% 3 4 4 5% 8% 37%	2016
	11th to 20th	Night	14% 9% 5% 7% 6% 3 5% 4 5% 6% 37%	1980
	21st to end	Night	18% 11% 4 5% 5% 3 4 5% 5% 7% 33%	2170
April	1st to 10th	Night	14% 11% 4 6% 5% 3 5% 5% 4 7% 37%	1800
	11th to 20th	Night	21% 10% 4 6% 5% 3 4 4 5% 5% 34%	1771
	21st to end	Night	19% 10% 3 6% 5% 2 3 4 5% 7% 36%	1620
May	1st to 10th	Night	17% 7% 3 6% 4 3 3 4 4 7% 42%	1566
	11th to 20th	Night	16% 5% 3 4 5% 4 4 3 6% 8% 43%	1416
	21st to end	Night	14% 6% 3 6% 5% 3 4 4 7% 9% 40%	1551
June	1st to 10th	Night	10% 4 2 5% 4 3 4 4 6% 9% 50%	1440
	11th to 20th	Night	11% 4 2 6% 5% 4 5% 5% 5% 8% 45%	1440
	21st to end	Night	9% 4 1 3 4 2 3 3 5% 9% 56%	1440
July	1st to 10th	Night	6% 3 2 3 3 2 4 5% 6% 9% 56%	1440
	11th to 20th	Night	5% 3 2 2 4 3 4 5% 6% 8% 60%	1440
	21st to end	Night	5% 3 2 3 4 2 4 4 5% 10% 59%	1659
August	1st to 10th	Night	6% 4 2 4 6% 2 4 6% 5% 9% 50%	1611
	11th to 20th	Night	10% 5% 2 4 4 2 4 3 6% 7% 54%	1600
	21st to end	Night	8% 3 2 5% 4 2 3 4 5% 7% 58%	1894
September	1st to 10th	Night	10% 4 2 5% 4 2 3 4 4 8% 56%	1800
	11th to 20th	Night	11% 5% 2 4 4 2 4 3 6% 7% 53%	1840
	21st to end	Night	11% 6% 2 4 5% 2 3 3 4 7% 52%	2038
October	1st to 10th	Night	14% 6% 2 5% 4 2 3 4 4 6% 49%	2160
	11th to 20th	Night	16% 7% 3 4 5% 3 4 4 5% 7% 43%	2160
	21st to end	Night	18% 10% 3 5% 4 2 4 3 5% 7% 39%	2376
November	1st to 10th	Night	12% 9% 3 5% 4 2 4 5% 4 6% 46%	2488
	11th to 20th	Night	12% 11% 6% 9% 6% 3 4 4 4 5% 36%	2660
	21st to end	Night	13% 10% 4 6% 5% 3 4 4 4 7% 40%	2660
December	1st to 10th	Night	10% 12% 5% 9% 9% 3 6% 5% 5% 7% 30%	2660
	11th to 20th	Night	12% 11% 5% 9% 8% 4 6% 5% 5% 6% 28%	3279
	21st to end	Night	21% 14% 6% 13% 7% 4 4 4 4 5% 18%	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	69% 7% 9% 12% 4	2528
	11th to 20th	Day	62% 4 11% 16% 7%	2635
	21st to end	Day	70% 5% 10% 11% 4	3135
February	1st to 10th	Day	59% 5% 12% 15% 8% 1	1701
	11th to 20th	Day	54% 6% 12% 20% 7% 1	1583
	21st to end	Day	56% 5% 11% 17% 10%	1386
March	1st to 10th	Day	55% 6% 13% 18% 7% 1	1957
	11th to 20th	Day	52% 6% 12% 22% 8% 1	1980
	21st to end	Day	57% 5% 11% 20% 6% 1	2184
April	1st to 10th	Day	52% 6% 11% 20% 9% 1	2160
	11th to 20th	Day	54% 4 10% 19% 11% 1	2137
	21st to end	Day	57% 5% 11% 18% 8% 1	2340
May	1st to 10th	Day	52% 6% 13% 21% 8% 1	2394
	11th to 20th	Day	45% 7% 14% 24% 10% 1	2483
	21st to end	Day	45% 7% 13% 22% 12% 1	2725
June	1st to 10th	Day	35% 6% 15% 29% 13% 1	2520
	11th to 20th	Day	39% 7% 13% 22% 17% 1	2520
	21st to end	Day	37% 8% 17% 26% 11% 2	2520
July	1st to 10th	Day	29% 9% 16% 32% 14% 1	2451
	11th to 20th	Day	30% 7% 14% 29% 18% 3	2445
	21st to end	Day	29% 8% 16% 31% 13% 3	2508
August	1st to 10th	Day	38% 6% 15% 28% 10% 3	2314
	11th to 20th	Day	38% 7% 13% 29% 12%	2301
	21st to end	Day	31% 7% 13% 30% 18% 2	2460
September	1st to 10th	Day	37% 6% 12% 29% 16%	2160
	11th to 20th	Day	35% 6% 15% 31% 13% 1	2116
	21st to end	Day	41% 5% 10% 30% 12% 1	1904
October	1st to 10th	Day	43% 6% 9% 27% 14% 1	1800
	11th to 20th	Day	43% 5% 12% 24% 13% 2	1800
	21st to end	Day	49% 5% 13% 22% 11% 1	1980
November	1st to 10th	Day	43% 6% 14% 19% 15% 3	1587
	11th to 20th	Day	55% 5% 11% 18% 10% 1	1520
	21st to end	Day	48% 5% 17% 21% 8% 1	1520
December	1st to 10th	Day	61% 5% 14% 12% 7% 1	1520
	11th to 20th	Day	56% 6% 19% 14% 5%	1915
	21st to end	Day	71% 4 10% 11% 3 1	2783
January	1st to 10th	Night	65% 4 10% 15% 5%	4428
	11th to 20th	Night	61% 5% 11% 17% 6%	4330
	21st to end	Night	65% 4 10% 14% 6%	4532
February	1st to 10th	Night	53% 4 11% 22% 9% 1	2464
	11th to 20th	Night	46% 5% 13% 23% 11% 2	2274
	21st to end	Night	51% 5% 9% 21% 12% 2	1868
March	1st to 10th	Night	46% 6% 15% 24% 8% 1	2016
	11th to 20th	Night	49% 5% 11% 22% 12% 1	1980
	21st to end	Night	51% 6% 12% 20% 9% 2	2170
April	1st to 10th	Night	47% 5% 12% 21% 14% 1	1800
	11th to 20th	Night	52% 5% 10% 16% 15% 3	1771
	21st to end	Night	49% 5% 9% 22% 14% 2	1620
May	1st to 10th	Night	44% 5% 13% 22% 14% 1	1566
	11th to 20th	Night	39% 7% 14% 24% 13% 3	1417
	21st to end	Night	41% 7% 12% 22% 16% 2	1552
June	1st to 10th	Night	31% 7% 12% 31% 16% 2	1440
	11th to 20th	Night	36% 7% 13% 21% 19% 3	1440
	21st to end	Night	27% 5% 16% 31% 19% 3	1440
July	1st to 10th	Night	23% 7% 14% 36% 19% 2	1400
	11th to 20th	Night	23% 6% 16% 32% 20% 4	1392
	21st to end	Night	21% 5% 15% 37% 18% 4	1567
August	1st to 10th	Night	30% 7% 13% 29% 17% 3	1601
	11th to 20th	Night	30% 7% 14% 29% 19% 2	1600
	21st to end	Night	26% 5% 15% 29% 21% 4	1894
September	1st to 10th	Night	28% 4 13% 32% 22% 1	1800
	11th to 20th	Night	31% 6% 14% 31% 18% 1	1840
	21st to end	Night	34% 5% 11% 31% 18% 1	2038
October	1st to 10th	Night	37% 5% 10% 29% 16% 3	2160
	11th to 20th	Night	41% 5% 12% 24% 16% 2	2160
	21st to end	Night	46% 5% 12% 23% 14% 1	2376
November	1st to 10th	Night	40% 5% 14% 24% 16% 3	2488
	11th to 20th	Night	50% 6% 11% 19% 13% 1	2660
	21st to end	Night	47% 4 15% 24% 9% 1	2660
December	1st to 10th	Night	54% 5% 14% 18% 7% 1	2660
	11th to 20th	Night	56% 5% 14% 18% 6% 1	3281
	21st to end	Night	68% 5% 9% 14% 4	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	14% 13% 35% 25% 9% 3	270
	11th to 20th	Day	19% 11% 40% 25% 4 1	270
	21st to end	Day	15% 8% 41% 25% 9% 2	297
February	1st to 10th	Day	11% 15% 45% 25% 3 1	267
	11th to 20th	Day	17% 15% 39% 23% 6%	240
	21st to end	Day	25% 12% 36% 24% 4	198
March	1st to 10th	Day	16% 16% 43% 18% 6%	240
	11th to 20th	Day	25% 10% 34% 24% 7% 1	240
	21st to end	Day	30% 11% 28% 19% 10% 1	270
April	1st to 10th	Day	27% 13% 34% 20% 5%	420
	11th to 20th	Day	27% 14% 25% 25% 8% 1	415
	21st to end	Day	26% 13% 27% 22% 8% 4	600
May	1st to 10th	Day	21% 12% 33% 24% 8% 2	603
	11th to 20th	Day	21% 12% 28% 24% 11% 4	625
	21st to end	Day	21% 8% 27% 26% 16% 3	679
June	1st to 10th	Day	11% 6% 25% 33% 18% 5%	630
	11th to 20th	Day	14% 6% 32% 33% 11% 3	630
	21st to end	Day	12% 7% 30% 28% 17% 5%	630
July	1st to 10th	Day	5% 4 24% 33% 24% 9%	621
	11th to 20th	Day	7% 6% 29% 31% 20% 7%	618
	21st to end	Day	8% 2 24% 39% 20% 6%	684
August	1st to 10th	Day	11% 3 20% 35% 26% 5%	626
	11th to 20th	Day	14% 4 21% 31% 24% 6%	615
	21st to end	Day	11% 3 30% 33% 17% 6%	579
September	1st to 10th	Day	18% 6% 28% 29% 15% 4	450
	11th to 20th	Day	13% 6% 33% 27% 17% 4	406
	21st to end	Day	16% 16% 29% 26% 9% 4	270
October	1st to 10th	Day	23% 8% 24% 27% 14% 5%	270
	11th to 20th	Day	18% 16% 39% 20% 7%	270
	21st to end	Day	29% 18% 31% 15% 8%	297
November	1st to 10th	Day	15% 18% 35% 22% 10% 1	270
	11th to 20th	Day	18% 19% 41% 17% 4	270
	21st to end	Day	19% 14% 42% 21% 3	270
December	1st to 10th	Day	17% 10% 41% 24% 6% 1	270
	11th to 20th	Day	17% 15% 40% 21% 6% 1	270
	21st to end	Day	26% 16% 36% 19% 4	297
January	1st to 10th	Night	12% 12% 41% 27% 7%	950
	11th to 20th	Night	17% 11% 38% 28% 6% 1	950
	21st to end	Night	19% 11% 36% 28% 7%	1045
February	1st to 10th	Night	14% 12% 40% 28% 5% 1	948
	11th to 20th	Night	15% 12% 44% 23% 6% 1	879
	21st to end	Night	17% 13% 35% 27% 7% 1	684
March	1st to 10th	Night	20% 10% 38% 23% 8% 1	576
	11th to 20th	Night	20% 8% 37% 27% 8%	540
	21st to end	Night	23% 9% 30% 25% 11% 1	594
April	1st to 10th	Night	18% 14% 37% 26% 4	540
	11th to 20th	Night	26% 11% 31% 25% 7% 1	533
	21st to end	Night	23% 10% 32% 26% 8% 2	540
May	1st to 10th	Night	21% 9% 32% 31% 7% 1	540
	11th to 20th	Night	18% 7% 31% 32% 10% 1	531
	21st to end	Night	17% 7% 29% 34% 13% 1	584
June	1st to 10th	Night	11% 4 30% 41% 13% 1	540
	11th to 20th	Night	12% 5% 34% 39% 11%	540
	21st to end	Night	10% 3 28% 41% 17% 1	540
July	1st to 10th	Night	7% 2 22% 41% 26% 2	525
	11th to 20th	Night	5% 3 27% 40% 23% 2	522
	21st to end	Night	5% 2 20% 52% 20% 2	591
August	1st to 10th	Night	9% 1 18% 45% 24% 2	537
	11th to 20th	Night	11% 2 21% 38% 24% 4	534
	21st to end	Night	8% 2 26% 40% 21% 3	594
September	1st to 10th	Night	12% 4 24% 40% 16% 3	540
	11th to 20th	Night	13% 6% 31% 33% 16% 2	540
	21st to end	Night	13% 9% 34% 30% 13% 1	598
October	1st to 10th	Night	18% 7% 32% 28% 14% 1	720
	11th to 20th	Night	19% 11% 36% 27% 7% 1	720
	21st to end	Night	24% 11% 31% 28% 6%	792
November	1st to 10th	Night	18% 11% 38% 24% 7% 1	836
	11th to 20th	Night	17% 13% 41% 23% 6%	950
	21st to end	Night	17% 13% 41% 22% 7%	950
December	1st to 10th	Night	16% 9% 40% 26% 7% 1	950
	11th to 20th	Night	19% 8% 41% 25% 6% 1	950
	21st to end	Night	25% 12% 34% 24% 5%	1045

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