New Ulm
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the New Ulm 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% 8% 3 7% 5% 4 4 4 6% 7% 38%	102151
	Night	12% 8% 3 8% 5% 4 4 4 5% 6% 41%	97393
Transparency	Day	45% 3 13% 26% 12% 1	105785
	Night	44% 2 12% 26% 14% 2	101900
Seeing	Day	17% 9% 30% 28% 14% 3	16050
	Night	16% 8% 32% 32% 11% 1	25949

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% 19% 4 16% 7% 5% 5% 3 4 5% 20%	2527
	11th to 20th	Day	6% 14% 6% 11% 7% 6% 8% 6% 9% 7% 20%	2722
	21st to end	Day	7% 19% 8% 15% 7% 6% 4 4 4 5% 21%	3135
February	1st to 10th	Day	7% 12% 5% 11% 8% 8% 6% 5% 6% 7% 26%	1710
	11th to 20th	Day	8% 13% 3 10% 7% 6% 5% 5% 6% 5% 31%	1664
	21st to end	Day	12% 12% 4 9% 6% 4 4 4 6% 8% 31%	1453
March	1st to 10th	Day	14% 10% 3 7% 4 4 4 3 5% 7% 38%	3436
	11th to 20th	Day	11% 9% 3 7% 4 3 4 3 6% 8% 41%	3480
	21st to end	Day	26% 12% 5% 10% 6% 4 4 3 3 6% 21%	3814
April	1st to 10th	Day	18% 10% 4 6% 4 3 4 3 7% 7% 35%	2249
	11th to 20th	Day	19% 12% 3 7% 5% 4 3 3 5% 5% 33%	2320
	21st to end	Day	24% 10% 3 6% 5% 4 4 3 5% 6% 31%	2470
May	1st to 10th	Day	18% 6% 1 6% 5% 5% 5% 5% 7% 7% 35%	4102
	11th to 20th	Day	14% 6% 2 6% 4 4 4 4 5% 7% 45%	4399
	21st to end	Day	18% 6% 3 7% 4 5% 4 4 6% 7% 37%	4824
June	1st to 10th	Day	11% 5% 2 5% 4 4 5% 3 6% 9% 47%	2660
	11th to 20th	Day	14% 6% 2 7% 4 5% 4 4 7% 8% 41%	2727
	21st to end	Day	9% 5% 2 6% 4 5% 4 5% 6% 9% 44%	2850
July	1st to 10th	Day	9% 5% 2 6% 5% 4 5% 5% 7% 11% 41%	4640
	11th to 20th	Day	5% 4 1 5% 3 3 3 3 5% 8% 59%	4440
	21st to end	Day	5% 4 2 5% 4 4 5% 4 7% 11% 49%	4562
August	1st to 10th	Day	13% 6% 2 6% 4 4 4 4 6% 7% 44%	4104
	11th to 20th	Day	11% 6% 2 6% 5% 4 5% 4 7% 9% 40%	4041
	21st to end	Day	8% 5% 2 6% 4 4 5% 3 5% 7% 51%	4405
September	1st to 10th	Day	12% 5% 2 5% 3 4 4 4 5% 7% 50%	2280
	11th to 20th	Day	11% 6% 2 4 5% 4 4 3 5% 8% 49%	2171
	21st to end	Day	14% 6% 2 6% 3 4 3 3 5% 7% 48%	2047
October	1st to 10th	Day	15% 7% 2 6% 4 3 4 3 5% 6% 44%	1900
	11th to 20th	Day	14% 8% 3 6% 3 4 4 3 4 6% 46%	1900
	21st to end	Day	17% 7% 3 7% 4 3 3 3 5% 6% 41%	2090
November	1st to 10th	Day	13% 9% 4 7% 4 4 3 3 5% 8% 41%	1656
	11th to 20th	Day	11% 12% 6% 10% 6% 4 4 4 4 6% 35%	1600
	21st to end	Day	14% 9% 3 8% 4 4 4 3 7% 9% 35%	1552
December	1st to 10th	Day	11% 13% 4 10% 8% 6% 5% 4 5% 6% 29%	1520
	11th to 20th	Day	11% 14% 5% 11% 6% 5% 4 4 6% 6% 29%	1918
	21st to end	Day	19% 13% 5% 17% 5% 4 4 3 4 6% 20%	2783
January	1st to 10th	Night	9% 14% 7% 19% 6% 5% 4 4 4 5% 24%	4428
	11th to 20th	Night	5% 11% 5% 14% 8% 7% 8% 7% 8% 7% 20%	4244
	21st to end	Night	9% 19% 8% 14% 5% 4 3 3 4 4 25%	4532
February	1st to 10th	Night	9% 12% 4 9% 7% 6% 4 4 4 7% 34%	2470
	11th to 20th	Night	9% 9% 3 8% 4 5% 5% 4 6% 7% 39%	2403
	21st to end	Night	11% 8% 3 8% 5% 5% 5% 4 6% 8% 36%	2015
March	1st to 10th	Night	9% 8% 3 6% 4 3 4 3 4 6% 50%	3419
	11th to 20th	Night	10% 6% 3 7% 4 5% 6% 4 5% 8% 43%	3480
	21st to end	Night	27% 12% 3 10% 3 3 3 3 4 5% 28%	3817
April	1st to 10th	Night	14% 11% 3 7% 4 4 4 3 5% 7% 38%	1930
	11th to 20th	Night	19% 9% 3 7% 4 4 3 4 5% 5% 37%	1807
	21st to end	Night	19% 8% 3 6% 4 4 4 4 5% 5% 38%	1710
May	1st to 10th	Night	15% 7% 2 5% 3 3 4 4 5% 6% 44%	2801
	11th to 20th	Night	13% 5% 2 4 3 3 4 3 6% 8% 49%	2506
	21st to end	Night	16% 7% 3 5% 4 3 3 3 5% 6% 45%	2743
June	1st to 10th	Night	10% 4 1 5% 3 4 4 5% 6% 6% 53%	1520
	11th to 20th	Night	10% 4 2 6% 5% 4 4 5% 6% 7% 47%	1444
	21st to end	Night	8% 4 2 4 4 3 3 3 5% 8% 56%	1330
July	1st to 10th	Night	8% 4 1 6% 4 5% 5% 4 6% 10% 47%	2308
	11th to 20th	Night	3 2 1 3 4 5% 4 4 6% 8% 62%	2530
	21st to end	Night	4 3 1 4 4 3 4 3 6% 8% 59%	2998
August	1st to 10th	Night	12% 6% 2 6% 3 4 4 3 6% 6% 49%	2836
	11th to 20th	Night	12% 4 2 4 4 3 3 3 6% 7% 51%	2798
	21st to end	Night	9% 5% 2 6% 3 3 4 3 5% 8% 51%	3257
September	1st to 10th	Night	9% 4 1 5% 3 3 3 3 4 6% 59%	1900
	11th to 20th	Night	10% 4 1 3 3 3 3 3 6% 8% 55%	2004
	21st to end	Night	11% 5% 2 5% 3 3 4 3 5% 6% 54%	2113
October	1st to 10th	Night	13% 6% 2 4 4 3 4 2 3 7% 51%	2280
	11th to 20th	Night	15% 7% 2 5% 4 3 3 3 4 6% 46%	2280
	21st to end	Night	15% 10% 3 7% 4 3 3 3 5% 5% 42%	2508
November	1st to 10th	Night	13% 6% 2 6% 4 4 4 3 5% 7% 45%	2636
	11th to 20th	Night	11% 11% 4 8% 5% 4 4 3 4 5% 39%	2800
	21st to end	Night	12% 9% 4 8% 5% 3 3 4 4 7% 40%	2723
December	1st to 10th	Night	10% 11% 4 10% 7% 5% 5% 4 5% 6% 33%	2660
	11th to 20th	Night	11% 11% 5% 11% 6% 5% 5% 4 6% 7% 30%	3279
	21st to end	Night	22% 13% 4 13% 6% 5% 4 3 4 5% 21%	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	68% 2 10% 15% 4	2528
	11th to 20th	Day	61% 2 11% 20% 6%	2722
	21st to end	Day	67% 2 12% 14% 4	3135
February	1st to 10th	Day	57% 2 12% 20% 8% 1	1710
	11th to 20th	Day	54% 4 12% 22% 7% 1	1673
	21st to end	Day	52% 4 15% 18% 11%	1453
March	1st to 10th	Day	48% 1 11% 28% 10% 1	3436
	11th to 20th	Day	44% 2 9% 31% 12% 3	3480
	21st to end	Day	68% 2 9% 16% 4	3814
April	1st to 10th	Day	49% 2 13% 25% 10% 1	2249
	11th to 20th	Day	54% 2 10% 21% 12% 1	2320
	21st to end	Day	56% 2 10% 22% 8% 1	2470
May	1st to 10th	Day	48% 2 10% 25% 14% 1	4140
	11th to 20th	Day	41% 2 8% 30% 16% 3	4403
	21st to end	Day	48% 2 10% 27% 12% 1	4837
June	1st to 10th	Day	35% 3 15% 30% 16% 1	2660
	11th to 20th	Day	42% 3 13% 24% 16% 2	2727
	21st to end	Day	37% 3 16% 28% 14% 2	2850
July	1st to 10th	Day	36% 5% 21% 26% 12% 1	4569
	11th to 20th	Day	24% 4 14% 37% 18% 2	4365
	21st to end	Day	28% 5% 16% 33% 16% 1	4418
August	1st to 10th	Day	40% 3 12% 32% 12% 2	4090
	11th to 20th	Day	40% 5% 17% 30% 8%	4080
	21st to end	Day	33% 5% 16% 30% 14% 1	4404
September	1st to 10th	Day	34% 3 12% 33% 18%	2280
	11th to 20th	Day	35% 2 15% 34% 13% 1	2171
	21st to end	Day	37% 2 12% 34% 14% 1	2047
October	1st to 10th	Day	30% 2 7% 34% 27% 1	3160
	11th to 20th	Day	38% 2 11% 26% 21% 2	3140
	21st to end	Day	42% 2 14% 30% 12% 1	3428
November	1st to 10th	Day	43% 2 14% 23% 15% 3	1656
	11th to 20th	Day	53% 3 13% 22% 10% 1	1600
	21st to end	Day	46% 3 20% 23% 8% 1	1552
December	1st to 10th	Day	56% 3 15% 16% 9% 1	1520
	11th to 20th	Day	56% 2 20% 17% 4	1915
	21st to end	Day	69% 1 11% 14% 5% 1	2783
January	1st to 10th	Night	64% 2 10% 18% 5%	4428
	11th to 20th	Night	62% 2 11% 18% 6%	4244
	21st to end	Night	64% 2 11% 17% 7%	4532
February	1st to 10th	Night	53% 2 12% 23% 9% 1	2470
	11th to 20th	Night	46% 3 13% 25% 12% 2	2404
	21st to end	Night	46% 3 12% 25% 12% 2	2015
March	1st to 10th	Night	38% 2 12% 31% 16% 1	3419
	11th to 20th	Night	41% 1 7% 31% 18% 1	3480
	21st to end	Night	62% 2 9% 20% 6% 2	3817
April	1st to 10th	Night	47% 2 12% 25% 13% 1	1930
	11th to 20th	Night	50% 1 7% 21% 18% 2	1807
	21st to end	Night	48% 2 8% 24% 15% 2	1710
May	1st to 10th	Night	42% 2 11% 21% 22% 2	2828
	11th to 20th	Night	35% 3 9% 28% 20% 5%	2507
	21st to end	Night	42% 2 11% 27% 17% 2	2751
June	1st to 10th	Night	31% 3 15% 31% 18% 3	1520
	11th to 20th	Night	37% 4 14% 23% 19% 4	1444
	21st to end	Night	27% 3 16% 32% 19% 3	1330
July	1st to 10th	Night	33% 5% 20% 26% 13% 2	2271
	11th to 20th	Night	21% 4 14% 35% 24% 3	2482
	21st to end	Night	23% 5% 16% 35% 20% 2	2903
August	1st to 10th	Night	36% 3 12% 29% 17% 3	2826
	11th to 20th	Night	33% 4 17% 31% 14% 1	2825
	21st to end	Night	31% 5% 16% 29% 16% 2	3257
September	1st to 10th	Night	28% 2 12% 35% 22% 1	1900
	11th to 20th	Night	29% 2 15% 35% 18% 1	2004
	21st to end	Night	33% 2 11% 32% 20% 2	2113
October	1st to 10th	Night	24% 1 6% 33% 32% 4	3800
	11th to 20th	Night	29% 2 12% 29% 23% 4	3779
	21st to end	Night	42% 2 11% 30% 14% 1	4120
November	1st to 10th	Night	41% 2 14% 26% 15% 3	2636
	11th to 20th	Night	49% 3 12% 22% 13% 1	2800
	21st to end	Night	46% 2 16% 24% 10% 1	2723
December	1st to 10th	Night	52% 3 17% 21% 8%	2660
	11th to 20th	Night	55% 2 16% 20% 6% 1	3281
	21st to end	Night	68% 1 9% 17% 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	15% 13% 34% 25% 11% 2	270
	11th to 20th	Day	18% 10% 38% 28% 5%	270
	21st to end	Day	13% 9% 36% 28% 12% 1	297
February	1st to 10th	Day	14% 15% 43% 22% 6%	270
	11th to 20th	Day	17% 13% 37% 29% 4	270
	21st to end	Day	21% 11% 40% 25% 2	225
March	1st to 10th	Day	18% 14% 43% 21% 4	270
	11th to 20th	Day	22% 9% 37% 24% 7% 1	270
	21st to end	Day	33% 9% 27% 21% 7% 3	297
April	1st to 10th	Day	29% 11% 32% 23% 6%	429
	11th to 20th	Day	29% 12% 27% 25% 7% 1	518
	21st to end	Day	28% 13% 27% 21% 9% 2	650
May	1st to 10th	Day	24% 9% 35% 22% 10% 1	653
	11th to 20th	Day	20% 11% 28% 25% 13% 3	675
	21st to end	Day	18% 7% 29% 31% 14% 2	734
June	1st to 10th	Day	12% 7% 25% 32% 19% 5%	680
	11th to 20th	Day	16% 7% 32% 30% 12% 3	680
	21st to end	Day	12% 7% 31% 31% 16% 4	680
July	1st to 10th	Day	8% 4 20% 32% 26% 9%	671
	11th to 20th	Day	9% 4 24% 33% 23% 7%	668
	21st to end	Day	8% 3 21% 40% 22% 7%	739
August	1st to 10th	Day	11% 3 19% 33% 27% 7%	676
	11th to 20th	Day	14% 4 18% 30% 28% 6%	665
	21st to end	Day	10% 4 25% 34% 21% 6%	673
September	1st to 10th	Day	17% 5% 24% 32% 18% 4	490
	11th to 20th	Day	11% 4 32% 29% 18% 6%	381
	21st to end	Day	15% 12% 29% 24% 14% 6%	300
October	1st to 10th	Day	19% 13% 28% 24% 12% 4	300
	11th to 20th	Day	17% 16% 39% 20% 5% 1	300
	21st to end	Day	25% 12% 38% 17% 7% 1	330
November	1st to 10th	Day	23% 11% 32% 24% 8% 2	300
	11th to 20th	Day	20% 16% 39% 18% 6%	300
	21st to end	Day	21% 15% 36% 22% 6%	282
December	1st to 10th	Day	14% 11% 44% 25% 6%	270
	11th to 20th	Day	19% 10% 41% 25% 4	270
	21st to end	Day	26% 15% 33% 23% 3	297
January	1st to 10th	Night	12% 11% 38% 29% 9% 1	950
	11th to 20th	Night	17% 9% 34% 32% 7% 1	950
	21st to end	Night	19% 11% 33% 30% 7%	1045
February	1st to 10th	Night	15% 11% 37% 29% 7% 1	950
	11th to 20th	Night	15% 13% 37% 28% 7% 1	929
	21st to end	Night	15% 10% 34% 31% 9% 1	759
March	1st to 10th	Night	16% 9% 39% 27% 8% 1	570
	11th to 20th	Night	20% 8% 37% 27% 8%	570
	21st to end	Night	25% 8% 28% 28% 8% 2	627
April	1st to 10th	Night	19% 10% 39% 27% 5%	570
	11th to 20th	Night	25% 10% 29% 26% 8% 1	563
	21st to end	Night	23% 9% 32% 27% 8% 1	570
May	1st to 10th	Night	20% 8% 32% 31% 9% 1	570
	11th to 20th	Night	21% 5% 31% 30% 11% 1	561
	21st to end	Night	19% 4 27% 36% 13% 1	617
June	1st to 10th	Night	11% 3 28% 41% 15% 1	570
	11th to 20th	Night	12% 3 33% 42% 11%	570
	21st to end	Night	9% 5% 25% 46% 14% 1	570
July	1st to 10th	Night	5% 4 20% 41% 27% 3	555
	11th to 20th	Night	4 2 24% 46% 24% 1	552
	21st to end	Night	5% 1 21% 49% 22% 2	624
August	1st to 10th	Night	9% 2 19% 45% 24% 2	567
	11th to 20th	Night	10% 2 15% 44% 26% 4	564
	21st to end	Night	7% 2 23% 44% 21% 3	627
September	1st to 10th	Night	11% 3 23% 42% 19% 2	570
	11th to 20th	Night	12% 3 30% 34% 18% 2	570
	21st to end	Night	13% 7% 32% 33% 14% 1	593
October	1st to 10th	Night	17% 8% 32% 29% 13% 1	760
	11th to 20th	Night	19% 9% 36% 28% 7% 1	760
	21st to end	Night	22% 11% 30% 29% 7%	836
November	1st to 10th	Night	17% 10% 34% 30% 8% 1	942
	11th to 20th	Night	19% 11% 38% 26% 7%	1000
	21st to end	Night	18% 11% 36% 27% 8%	973
December	1st to 10th	Night	17% 10% 34% 31% 8% 1	950
	11th to 20th	Night	22% 6% 35% 29% 8% 1	950
	21st to end	Night	25% 10% 32% 27% 6%	1045

Page generated at 2024-11-22 07:02:27. Version ac07

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